diff --git a/v2rayN/Directory.Build.props b/v2rayN/Directory.Build.props
index d97ccb93..069c74df 100644
--- a/v2rayN/Directory.Build.props
+++ b/v2rayN/Directory.Build.props
@@ -8,7 +8,7 @@
         <TargetFramework>net8.0</TargetFramework>
         <TargetLatestRuntimePatch>true</TargetLatestRuntimePatch>
         <CheckForOverflowUnderflow>true</CheckForOverflowUnderflow>
-        <NoWarn>CA1031;CS1591;NU1507;CA1416;IDE0058</NoWarn>
+        <NoWarn>CA1031;CS1591;NU1507;CA1416;IDE0058;IDE0053;IDE0200</NoWarn>
         <Nullable>annotations</Nullable>
         <ImplicitUsings>enable</ImplicitUsings>
         <Authors>2dust</Authors>
diff --git a/v2rayN/ServiceLib/Common/Utils.cs b/v2rayN/ServiceLib/Common/Utils.cs
index 2075342a..aedd3334 100644
--- a/v2rayN/ServiceLib/Common/Utils.cs
+++ b/v2rayN/ServiceLib/Common/Utils.cs
@@ -306,7 +306,10 @@ public class Utils
     public static bool IsBase64String(string? plainText)
     {
         if (plainText.IsNullOrEmpty())
+        {
             return false;
+        }
+
         var buffer = new Span<byte>(new byte[plainText.Length]);
         return Convert.TryFromBase64String(plainText, buffer, out var _);
     }
@@ -520,40 +523,62 @@ public class Utils
         {
             // Loopback address check (127.0.0.1 for IPv4, ::1 for IPv6)
             if (IPAddress.IsLoopback(address))
+            {
                 return true;
+            }
 
             var ipBytes = address.GetAddressBytes();
             if (address.AddressFamily == AddressFamily.InterNetwork)
             {
                 // IPv4 private address check
                 if (ipBytes[0] == 10)
+                {
                     return true;
+                }
+
                 if (ipBytes[0] == 172 && ipBytes[1] >= 16 && ipBytes[1] <= 31)
+                {
                     return true;
+                }
+
                 if (ipBytes[0] == 192 && ipBytes[1] == 168)
+                {
                     return true;
+                }
             }
             else if (address.AddressFamily == AddressFamily.InterNetworkV6)
             {
                 // IPv6 private address check
                 // Link-local address fe80::/10
                 if (ipBytes[0] == 0xfe && (ipBytes[1] & 0xc0) == 0x80)
+                {
                     return true;
+                }
 
                 // Unique local address fc00::/7 (typically fd00::/8)
                 if ((ipBytes[0] & 0xfe) == 0xfc)
+                {
                     return true;
+                }
 
                 // Private portion in IPv4-mapped addresses ::ffff:0:0/96
                 if (address.IsIPv4MappedToIPv6)
                 {
                     var ipv4Bytes = ipBytes.Skip(12).ToArray();
                     if (ipv4Bytes[0] == 10)
+                    {
                         return true;
+                    }
+
                     if (ipv4Bytes[0] == 172 && ipv4Bytes[1] >= 16 && ipv4Bytes[1] <= 31)
+                    {
                         return true;
+                    }
+
                     if (ipv4Bytes[0] == 192 && ipv4Bytes[1] == 168)
+                    {
                         return true;
+                    }
                 }
             }
         }
@@ -708,10 +733,16 @@ public class Utils
                 foreach (var host in hostsList)
                 {
                     if (host.StartsWith("#"))
+                    {
                         continue;
+                    }
+
                     var hostItem = host.Split(new[] { ' ', '\t' }, StringSplitOptions.RemoveEmptyEntries);
                     if (hostItem.Length < 2)
+                    {
                         continue;
+                    }
+
                     systemHosts.Add(hostItem[1], hostItem[0]);
                 }
             }
diff --git a/v2rayN/ServiceLib/Handler/ConfigHandler.cs b/v2rayN/ServiceLib/Handler/ConfigHandler.cs
index 72addec4..08937c5e 100644
--- a/v2rayN/ServiceLib/Handler/ConfigHandler.cs
+++ b/v2rayN/ServiceLib/Handler/ConfigHandler.cs
@@ -1651,7 +1651,9 @@ public static class ConfigHandler
 
         var uri = Utils.TryUri(url);
         if (uri == null)
+        {
             return -1;
+        }
         //Do not allow http protocol
         if (url.StartsWith(Global.HttpProtocol) && !Utils.IsPrivateNetwork(uri.IdnHost))
         {
@@ -2018,11 +2020,15 @@ public static class ConfigHandler
         var downloadHandle = new DownloadService();
         var templateContent = await downloadHandle.TryDownloadString(config.ConstItem.RouteRulesTemplateSourceUrl, true, "");
         if (templateContent.IsNullOrEmpty())
+        {
             return await InitBuiltinRouting(config, blImportAdvancedRules); // fallback
+        }
 
         var template = JsonUtils.Deserialize<RoutingTemplate>(templateContent);
         if (template == null)
+        {
             return await InitBuiltinRouting(config, blImportAdvancedRules); // fallback
+        }
 
         var items = await AppManager.Instance.RoutingItems();
         var maxSort = items.Count;
@@ -2035,14 +2041,18 @@ public static class ConfigHandler
             var item = template.RoutingItems[i];
 
             if (item.Url.IsNullOrEmpty() && item.RuleSet.IsNullOrEmpty())
+            {
                 continue;
+            }
 
             var ruleSetsString = !item.RuleSet.IsNullOrEmpty()
                 ? item.RuleSet
                 : await downloadHandle.TryDownloadString(item.Url, true, "");
 
             if (ruleSetsString.IsNullOrEmpty())
+            {
                 continue;
+            }
 
             item.Remarks = $"{template.Version}-{item.Remarks}";
             item.Enabled = true;
@@ -2238,17 +2248,25 @@ public static class ConfigHandler
         var downloadHandle = new DownloadService();
         var templateContent = await downloadHandle.TryDownloadString(url, true, "");
         if (templateContent.IsNullOrEmpty())
+        {
             return currentItem;
+        }
 
         var template = JsonUtils.Deserialize<DNSItem>(templateContent);
         if (template == null)
+        {
             return currentItem;
+        }
 
         if (!template.NormalDNS.IsNullOrEmpty())
+        {
             template.NormalDNS = await downloadHandle.TryDownloadString(template.NormalDNS, true, "");
+        }
 
         if (!template.TunDNS.IsNullOrEmpty())
+        {
             template.TunDNS = await downloadHandle.TryDownloadString(template.TunDNS, true, "");
+        }
 
         template.Id = currentItem.Id;
         template.Enabled = currentItem.Enabled;
@@ -2282,10 +2300,16 @@ public static class ConfigHandler
         var downloadHandle = new DownloadService();
         var templateContent = await downloadHandle.TryDownloadString(url, true, "");
         if (templateContent.IsNullOrEmpty())
+        {
             return null;
+        }
+
         var template = JsonUtils.Deserialize<SimpleDNSItem>(templateContent);
         if (template == null)
+        {
             return null;
+        }
+
         return template;
     }
 
diff --git a/v2rayN/ServiceLib/Handler/Fmt/Hysteria2Fmt.cs b/v2rayN/ServiceLib/Handler/Fmt/Hysteria2Fmt.cs
index 5376780f..ae670662 100644
--- a/v2rayN/ServiceLib/Handler/Fmt/Hysteria2Fmt.cs
+++ b/v2rayN/ServiceLib/Handler/Fmt/Hysteria2Fmt.cs
@@ -12,7 +12,9 @@ public class Hysteria2Fmt : BaseFmt
 
         var url = Utils.TryUri(str);
         if (url == null)
+        {
             return null;
+        }
 
         item.Address = url.IdnHost;
         item.Port = url.Port;
@@ -32,7 +34,10 @@ public class Hysteria2Fmt : BaseFmt
     public static string? ToUri(ProfileItem? item)
     {
         if (item == null)
+        {
             return null;
+        }
+
         var url = string.Empty;
 
         var remark = string.Empty;
diff --git a/v2rayN/ServiceLib/Manager/ActionPrecheckManager.cs b/v2rayN/ServiceLib/Manager/ActionPrecheckManager.cs
index f4f998b3..75e3e00e 100644
--- a/v2rayN/ServiceLib/Manager/ActionPrecheckManager.cs
+++ b/v2rayN/ServiceLib/Manager/ActionPrecheckManager.cs
@@ -81,21 +81,36 @@ public class ActionPrecheckManager(Config config)
             {
                 case EConfigType.VMess:
                     if (item.Id.IsNullOrEmpty() || !Utils.IsGuidByParse(item.Id))
+                    {
                         errors.Add(string.Format(ResUI.InvalidProperty, "Id"));
+                    }
+
                     break;
 
                 case EConfigType.VLESS:
                     if (item.Id.IsNullOrEmpty() || (!Utils.IsGuidByParse(item.Id) && item.Id.Length > 30))
+                    {
                         errors.Add(string.Format(ResUI.InvalidProperty, "Id"));
+                    }
+
                     if (!Global.Flows.Contains(item.Flow))
+                    {
                         errors.Add(string.Format(ResUI.InvalidProperty, "Flow"));
+                    }
+
                     break;
 
                 case EConfigType.Shadowsocks:
                     if (item.Id.IsNullOrEmpty())
+                    {
                         errors.Add(string.Format(ResUI.InvalidProperty, "Id"));
+                    }
+
                     if (string.IsNullOrEmpty(item.Security) || !Global.SsSecuritiesInSingbox.Contains(item.Security))
+                    {
                         errors.Add(string.Format(ResUI.InvalidProperty, "Security"));
+                    }
+
                     break;
             }
 
diff --git a/v2rayN/ServiceLib/Manager/ProfileGroupItemManager.cs b/v2rayN/ServiceLib/Manager/ProfileGroupItemManager.cs
index 6cd260d3..499ad3de 100644
--- a/v2rayN/ServiceLib/Manager/ProfileGroupItemManager.cs
+++ b/v2rayN/ServiceLib/Manager/ProfileGroupItemManager.cs
@@ -173,13 +173,19 @@ public class ProfileGroupItemManager
     public static bool HasCycle(string? indexId, HashSet<string> visited, HashSet<string> stack)
     {
         if (indexId.IsNullOrEmpty())
+        {
             return false;
+        }
 
         if (stack.Contains(indexId))
+        {
             return true;
+        }
 
         if (visited.Contains(indexId))
+        {
             return false;
+        }
 
         visited.Add(indexId);
         stack.Add(indexId);
@@ -289,7 +295,9 @@ public class ProfileGroupItemManager
         {
             var childNode = await AppManager.Instance.GetProfileItem(childId);
             if (childNode == null)
+            {
                 continue;
+            }
 
             if (!childNode.IsComplex())
             {
diff --git a/v2rayN/ServiceLib/Models/ProfileItem.cs b/v2rayN/ServiceLib/Models/ProfileItem.cs
index b832a5e7..00ed38da 100644
--- a/v2rayN/ServiceLib/Models/ProfileItem.cs
+++ b/v2rayN/ServiceLib/Models/ProfileItem.cs
@@ -69,30 +69,49 @@ public class ProfileItem : ReactiveObject
     public bool IsValid()
     {
         if (IsComplex())
+        {
             return true;
+        }
 
         if (Address.IsNullOrEmpty() || Port is <= 0 or >= 65536)
+        {
             return false;
+        }
 
         switch (ConfigType)
         {
             case EConfigType.VMess:
                 if (Id.IsNullOrEmpty() || !Utils.IsGuidByParse(Id))
+                {
                     return false;
+                }
+
                 break;
 
             case EConfigType.VLESS:
                 if (Id.IsNullOrEmpty() || (!Utils.IsGuidByParse(Id) && Id.Length > 30))
+                {
                     return false;
+                }
+
                 if (!Global.Flows.Contains(Flow))
+                {
                     return false;
+                }
+
                 break;
 
             case EConfigType.Shadowsocks:
                 if (Id.IsNullOrEmpty())
+                {
                     return false;
+                }
+
                 if (string.IsNullOrEmpty(Security) || !Global.SsSecuritiesInSingbox.Contains(Security))
+                {
                     return false;
+                }
+
                 break;
         }
 
diff --git a/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxDnsService.cs b/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxDnsService.cs
index c5ba5b0c..f6190ea9 100644
--- a/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxDnsService.cs
+++ b/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxDnsService.cs
@@ -202,7 +202,9 @@ public partial class CoreConfigSingboxService
 
         var routing = await ConfigHandler.GetDefaultRouting(_config);
         if (routing == null)
+        {
             return 0;
+        }
 
         var rules = JsonUtils.Deserialize<List<RulesItem>>(routing.RuleSet) ?? [];
         var expectedIPCidr = new List<string>();
diff --git a/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxOutboundService.cs b/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxOutboundService.cs
index 1f1e68a0..e9d35a89 100644
--- a/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxOutboundService.cs
+++ b/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxOutboundService.cs
@@ -679,7 +679,10 @@ public partial class CoreConfigSingboxService
         {
             var node = nodes[i];
             if (node == null)
+            {
                 continue;
+            }
+
             if (node.ConfigType.IsGroupType())
             {
                 var (childProfiles, profileGroupItem) = await ProfileGroupItemManager.GetChildProfileItems(node.IndexId);
diff --git a/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxRoutingService.cs b/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxRoutingService.cs
index 9cd02204..33fde24e 100644
--- a/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxRoutingService.cs
+++ b/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxRoutingService.cs
@@ -250,7 +250,9 @@ public partial class CoreConfigSingboxService
                 foreach (var it in item.Domain)
                 {
                     if (ParseV2Domain(it, rule1))
+                    {
                         countDomain++;
+                    }
                 }
                 if (countDomain > 0)
                 {
@@ -265,7 +267,9 @@ public partial class CoreConfigSingboxService
                 foreach (var it in item.Ip)
                 {
                     if (ParseV2Address(it, rule2))
+                    {
                         countIp++;
+                    }
                 }
                 if (countIp > 0)
                 {
diff --git a/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxRulesetService.cs b/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxRulesetService.cs
index ef611c91..7d26ca2f 100644
--- a/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxRulesetService.cs
+++ b/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxRulesetService.cs
@@ -7,7 +7,9 @@ public partial class CoreConfigSingboxService
         static void AddRuleSets(List<string> ruleSets, List<string>? rule_set)
         {
             if (rule_set != null)
+            {
                 ruleSets.AddRange(rule_set);
+            }
         }
         var geosite = "geosite";
         var geoip = "geoip";
diff --git a/v2rayN/ServiceLib/Services/CoreConfig/V2ray/CoreConfigV2rayService.cs b/v2rayN/ServiceLib/Services/CoreConfig/V2ray/CoreConfigV2rayService.cs
index 6deff64d..d753fb3c 100644
--- a/v2rayN/ServiceLib/Services/CoreConfig/V2ray/CoreConfigV2rayService.cs
+++ b/v2rayN/ServiceLib/Services/CoreConfig/V2ray/CoreConfigV2rayService.cs
@@ -137,7 +137,9 @@ public partial class CoreConfigV2rayService(Config config)
                 foreach (var rule in rules)
                 {
                     if (rule.outboundTag == null)
+                    {
                         continue;
+                    }
 
                     if (balancerTagSet.Contains(rule.outboundTag))
                     {
diff --git a/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayBalancerService.cs b/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayBalancerService.cs
index 660cc700..35a220c6 100644
--- a/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayBalancerService.cs
+++ b/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayBalancerService.cs
@@ -11,7 +11,9 @@ public partial class CoreConfigV2rayService
 
         // Case 1: exact match already exists -> nothing to do
         if (subjectSelectors.Any(baseTagName.StartsWith))
+        {
             return await Task.FromResult(0);
+        }
 
         // Case 2: prefix match exists -> reuse it and move to the first position
         var matched = subjectSelectors.FirstOrDefault(s => s.StartsWith(baseTagName));
diff --git a/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayDnsService.cs b/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayDnsService.cs
index 2218d013..c24b1eb2 100644
--- a/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayDnsService.cs
+++ b/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayDnsService.cs
@@ -189,7 +189,10 @@ public partial class CoreConfigV2rayService
                 foreach (var domain in item.Domain)
                 {
                     if (domain.StartsWith('#'))
+                    {
                         continue;
+                    }
+
                     var normalizedDomain = domain.Replace(Global.RoutingRuleComma, ",");
 
                     if (item.OutboundTag == Global.DirectTag)
@@ -368,7 +371,10 @@ public partial class CoreConfigV2rayService
                         foreach (var host in systemHosts)
                         {
                             if (normalHost1[host.Key] != null)
+                            {
                                 continue;
+                            }
+
                             normalHost1[host.Key] = host.Value;
                         }
                     }
diff --git a/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayOutboundService.cs b/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayOutboundService.cs
index 46169c37..3f1f7c5f 100644
--- a/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayOutboundService.cs
+++ b/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayOutboundService.cs
@@ -803,7 +803,10 @@ public partial class CoreConfigV2rayService
         {
             var node = nodes[i];
             if (node == null)
+            {
                 continue;
+            }
+
             if (node.ConfigType.IsGroupType())
             {
                 var (childProfiles, _) = await ProfileGroupItemManager.GetChildProfileItems(node.IndexId);
diff --git a/v2rayN/ServiceLib/Services/SpeedtestService.cs b/v2rayN/ServiceLib/Services/SpeedtestService.cs
index bb4e9386..3cb5c2b6 100644
--- a/v2rayN/ServiceLib/Services/SpeedtestService.cs
+++ b/v2rayN/ServiceLib/Services/SpeedtestService.cs
@@ -21,7 +21,7 @@ public class SpeedtestService(Config config, Func<SpeedTestResult, Task> updateF
     {
         if (_lstExitLoop.Count > 0)
         {
-            UpdateFunc("", ResUI.SpeedtestingStop);
+            _ = UpdateFunc("", ResUI.SpeedtestingStop);
 
             _lstExitLoop.Clear();
         }
diff --git a/v2rayN/ServiceLib/ViewModels/CheckUpdateViewModel.cs b/v2rayN/ServiceLib/ViewModels/CheckUpdateViewModel.cs
index 5267979b..f2b39361 100644
--- a/v2rayN/ServiceLib/ViewModels/CheckUpdateViewModel.cs
+++ b/v2rayN/ServiceLib/ViewModels/CheckUpdateViewModel.cs
@@ -209,6 +209,7 @@ public class CheckUpdateViewModel : MyReactiveObject
             _ = UpdateFinishedResult(blReload);
             return Disposable.Empty;
         });
+        await Task.CompletedTask;
     }
 
     public async Task UpdateFinishedResult(bool blReload)
@@ -321,6 +322,7 @@ public class CheckUpdateViewModel : MyReactiveObject
             _ = UpdateViewResult(model);
             return Disposable.Empty;
         });
+        await Task.CompletedTask;
     }
 
     public async Task UpdateViewResult(CheckUpdateModel model)
@@ -331,5 +333,6 @@ public class CheckUpdateViewModel : MyReactiveObject
             return;
         }
         found.Remarks = model.Remarks;
+        await Task.CompletedTask;
     }
 }
diff --git a/v2rayN/ServiceLib/ViewModels/ClashConnectionsViewModel.cs b/v2rayN/ServiceLib/ViewModels/ClashConnectionsViewModel.cs
index dbcc9a79..dba8190f 100644
--- a/v2rayN/ServiceLib/ViewModels/ClashConnectionsViewModel.cs
+++ b/v2rayN/ServiceLib/ViewModels/ClashConnectionsViewModel.cs
@@ -96,6 +96,7 @@ public class ClashConnectionsViewModel : MyReactiveObject
         }
 
         ConnectionItems.AddRange(lstModel);
+        await Task.CompletedTask;
     }
 
     public async Task ClashConnectionClose(bool all)
diff --git a/v2rayN/ServiceLib/ViewModels/ClashProxiesViewModel.cs b/v2rayN/ServiceLib/ViewModels/ClashProxiesViewModel.cs
index 3f636456..d49193ad 100644
--- a/v2rayN/ServiceLib/ViewModels/ClashProxiesViewModel.cs
+++ b/v2rayN/ServiceLib/ViewModels/ClashProxiesViewModel.cs
@@ -245,6 +245,7 @@ public class ClashProxiesViewModel : MyReactiveObject
         {
             SelectedGroup = new();
         }
+        await Task.CompletedTask;
     }
 
     private void RefreshProxyDetails(bool c)
@@ -391,6 +392,7 @@ public class ClashProxiesViewModel : MyReactiveObject
                 _ = ProxiesDelayTestResult(model);
                 return Disposable.Empty;
             });
+            await Task.CompletedTask;
         });
         await Task.CompletedTask;
     }
@@ -419,6 +421,7 @@ public class ClashProxiesViewModel : MyReactiveObject
             detail.Delay = _delayTimeout;
             detail.DelayName = string.Empty;
         }
+        await Task.CompletedTask;
     }
 
     #endregion proxy function
diff --git a/v2rayN/ServiceLib/ViewModels/FullConfigTemplateViewModel.cs b/v2rayN/ServiceLib/ViewModels/FullConfigTemplateViewModel.cs
index a3907fc5..3a50b52e 100644
--- a/v2rayN/ServiceLib/ViewModels/FullConfigTemplateViewModel.cs
+++ b/v2rayN/ServiceLib/ViewModels/FullConfigTemplateViewModel.cs
@@ -66,10 +66,14 @@ public class FullConfigTemplateViewModel : MyReactiveObject
     private async Task SaveSettingAsync()
     {
         if (!await SaveXrayConfigAsync())
+        {
             return;
+        }
 
         if (!await SaveSingboxConfigAsync())
+        {
             return;
+        }
 
         NoticeManager.Instance.Enqueue(ResUI.OperationSuccess);
         _ = _updateView?.Invoke(EViewAction.CloseWindow, null);
diff --git a/v2rayN/ServiceLib/ViewModels/MainWindowViewModel.cs b/v2rayN/ServiceLib/ViewModels/MainWindowViewModel.cs
index 0b721184..d26213fb 100644
--- a/v2rayN/ServiceLib/ViewModels/MainWindowViewModel.cs
+++ b/v2rayN/ServiceLib/ViewModels/MainWindowViewModel.cs
@@ -78,55 +78,55 @@ public class MainWindowViewModel : MyReactiveObject
         //servers
         AddVmessServerCmd = ReactiveCommand.CreateFromTask(async () =>
         {
-            await AddServerAsync(true, EConfigType.VMess);
+            await AddServerAsync(EConfigType.VMess);
         });
         AddVlessServerCmd = ReactiveCommand.CreateFromTask(async () =>
         {
-            await AddServerAsync(true, EConfigType.VLESS);
+            await AddServerAsync(EConfigType.VLESS);
         });
         AddShadowsocksServerCmd = ReactiveCommand.CreateFromTask(async () =>
         {
-            await AddServerAsync(true, EConfigType.Shadowsocks);
+            await AddServerAsync(EConfigType.Shadowsocks);
         });
         AddSocksServerCmd = ReactiveCommand.CreateFromTask(async () =>
         {
-            await AddServerAsync(true, EConfigType.SOCKS);
+            await AddServerAsync(EConfigType.SOCKS);
         });
         AddHttpServerCmd = ReactiveCommand.CreateFromTask(async () =>
         {
-            await AddServerAsync(true, EConfigType.HTTP);
+            await AddServerAsync(EConfigType.HTTP);
         });
         AddTrojanServerCmd = ReactiveCommand.CreateFromTask(async () =>
         {
-            await AddServerAsync(true, EConfigType.Trojan);
+            await AddServerAsync(EConfigType.Trojan);
         });
         AddHysteria2ServerCmd = ReactiveCommand.CreateFromTask(async () =>
         {
-            await AddServerAsync(true, EConfigType.Hysteria2);
+            await AddServerAsync(EConfigType.Hysteria2);
         });
         AddTuicServerCmd = ReactiveCommand.CreateFromTask(async () =>
         {
-            await AddServerAsync(true, EConfigType.TUIC);
+            await AddServerAsync(EConfigType.TUIC);
         });
         AddWireguardServerCmd = ReactiveCommand.CreateFromTask(async () =>
         {
-            await AddServerAsync(true, EConfigType.WireGuard);
+            await AddServerAsync(EConfigType.WireGuard);
         });
         AddAnytlsServerCmd = ReactiveCommand.CreateFromTask(async () =>
         {
-            await AddServerAsync(true, EConfigType.Anytls);
+            await AddServerAsync(EConfigType.Anytls);
         });
         AddCustomServerCmd = ReactiveCommand.CreateFromTask(async () =>
         {
-            await AddServerAsync(true, EConfigType.Custom);
+            await AddServerAsync(EConfigType.Custom);
         });
         AddPolicyGroupServerCmd = ReactiveCommand.CreateFromTask(async () =>
         {
-            await AddServerAsync(true, EConfigType.PolicyGroup);
+            await AddServerAsync(EConfigType.PolicyGroup);
         });
         AddProxyChainServerCmd = ReactiveCommand.CreateFromTask(async () =>
         {
-            await AddServerAsync(true, EConfigType.ProxyChain);
+            await AddServerAsync(EConfigType.ProxyChain);
         });
         AddServerViaClipboardCmd = ReactiveCommand.CreateFromTask(async () =>
         {
@@ -283,6 +283,7 @@ public class MainWindowViewModel : MyReactiveObject
         {
             NoticeManager.Instance.Enqueue(msg);
         }
+        await Task.CompletedTask;
     }
 
     private async Task UpdateTaskHandler(bool success, string msg)
@@ -310,6 +311,7 @@ public class MainWindowViewModel : MyReactiveObject
             return;
         }
         AppEvents.DispatcherStatisticsRequested.Publish(update);
+        await Task.CompletedTask;
     }
 
     #endregion Actions
@@ -332,7 +334,7 @@ public class MainWindowViewModel : MyReactiveObject
 
     #region Add Servers
 
-    public async Task AddServerAsync(bool blNew, EConfigType eConfigType)
+    public async Task AddServerAsync(EConfigType eConfigType)
     {
         ProfileItem item = new()
         {
diff --git a/v2rayN/ServiceLib/ViewModels/ProfilesViewModel.cs b/v2rayN/ServiceLib/ViewModels/ProfilesViewModel.cs
index 12f4804b..a6bb2567 100644
--- a/v2rayN/ServiceLib/ViewModels/ProfilesViewModel.cs
+++ b/v2rayN/ServiceLib/ViewModels/ProfilesViewModel.cs
@@ -110,7 +110,7 @@ public class ProfilesViewModel : MyReactiveObject
         //servers delete
         EditServerCmd = ReactiveCommand.CreateFromTask(async () =>
         {
-            await EditServerAsync(EConfigType.Custom);
+            await EditServerAsync();
         }, canEditRemove);
         RemoveServerCmd = ReactiveCommand.CreateFromTask(async () =>
         {
@@ -300,14 +300,14 @@ public class ProfilesViewModel : MyReactiveObject
 
         if (result.Delay.IsNotEmpty())
         {
-            int.TryParse(result.Delay, out var temp);
-            item.Delay = temp;
+            item.Delay = result.Delay.ToInt();
             item.DelayVal = result.Delay ?? string.Empty;
         }
         if (result.Speed.IsNotEmpty())
         {
             item.SpeedVal = result.Speed ?? string.Empty;
         }
+        await Task.CompletedTask;
     }
 
     public async Task UpdateStatistics(ServerSpeedItem update)
@@ -333,6 +333,7 @@ public class ProfilesViewModel : MyReactiveObject
         catch
         {
         }
+        await Task.CompletedTask;
     }
 
     #endregion Actions
@@ -487,7 +488,7 @@ public class ProfilesViewModel : MyReactiveObject
         return lstSelected;
     }
 
-    public async Task EditServerAsync(EConfigType eConfigType)
+    public async Task EditServerAsync()
     {
         if (string.IsNullOrEmpty(SelectedProfile?.IndexId))
         {
@@ -499,7 +500,7 @@ public class ProfilesViewModel : MyReactiveObject
             NoticeManager.Instance.Enqueue(ResUI.PleaseSelectServer);
             return;
         }
-        eConfigType = item.ConfigType;
+        var eConfigType = item.ConfigType;
 
         bool? ret = false;
         if (eConfigType == EConfigType.Custom)
@@ -753,6 +754,7 @@ public class ProfilesViewModel : MyReactiveObject
                 _ = SetSpeedTestResult(result);
                 return Disposable.Empty;
             });
+            await Task.CompletedTask;
         });
         _speedtestService?.RunLoop(actionType, lstSelected);
     }
diff --git a/v2rayN/ServiceLib/ViewModels/StatusBarViewModel.cs b/v2rayN/ServiceLib/ViewModels/StatusBarViewModel.cs
index 42cdafa8..b7c2a1e7 100644
--- a/v2rayN/ServiceLib/ViewModels/StatusBarViewModel.cs
+++ b/v2rayN/ServiceLib/ViewModels/StatusBarViewModel.cs
@@ -120,7 +120,7 @@ public class StatusBarViewModel : MyReactiveObject
         this.WhenAnyValue(
                 x => x.SelectedServer,
                 y => y != null && !y.Text.IsNullOrEmpty())
-            .Subscribe(c => ServerSelectedChanged(c));
+            .Subscribe(ServerSelectedChanged);
 
         SystemProxySelected = (int)_config.SystemProxyItem.SysProxyType;
         this.WhenAnyValue(
@@ -367,11 +367,13 @@ public class StatusBarViewModel : MyReactiveObject
             _ = TestServerAvailabilityResult(msg);
             return Disposable.Empty;
         });
+        await Task.CompletedTask;
     }
 
     public async Task TestServerAvailabilityResult(string msg)
     {
         RunningInfoDisplay = msg;
+        await Task.CompletedTask;
     }
 
     #region System proxy and Routings
@@ -384,7 +386,7 @@ public class StatusBarViewModel : MyReactiveObject
         }
         _config.SystemProxyItem.SysProxyType = type;
         await ChangeSystemProxyAsync(type, true);
-        NoticeManager.Instance.SendMessageEx($"{ResUI.TipChangeSystemProxy} - {_config.SystemProxyItem.SysProxyType.ToString()}");
+        NoticeManager.Instance.SendMessageEx($"{ResUI.TipChangeSystemProxy} - {_config.SystemProxyItem.SysProxyType}");
 
         SystemProxySelected = (int)_config.SystemProxyItem.SysProxyType;
         await ConfigHandler.SaveConfig(_config);
@@ -561,6 +563,7 @@ public class StatusBarViewModel : MyReactiveObject
         catch
         {
         }
+        await Task.CompletedTask;
     }
 
     #endregion UI
diff --git a/v2rayN/v2rayN.Desktop/Common/AvaUtils.cs b/v2rayN/v2rayN.Desktop/Common/AvaUtils.cs
index 1ef294f6..cca01643 100644
--- a/v2rayN/v2rayN.Desktop/Common/AvaUtils.cs
+++ b/v2rayN/v2rayN.Desktop/Common/AvaUtils.cs
@@ -28,7 +28,10 @@ internal class AvaUtils
         {
             var clipboard = TopLevel.GetTopLevel(visual)?.Clipboard;
             if (clipboard == null)
+            {
                 return;
+            }
+
             await clipboard.SetTextAsync(strData);
         }
         catch
diff --git a/v2rayN/v2rayN.Desktop/Converters/DelayColorConverter.cs b/v2rayN/v2rayN.Desktop/Converters/DelayColorConverter.cs
index 82cd0cf1..7b339aea 100644
--- a/v2rayN/v2rayN.Desktop/Converters/DelayColorConverter.cs
+++ b/v2rayN/v2rayN.Desktop/Converters/DelayColorConverter.cs
@@ -6,7 +6,7 @@ public class DelayColorConverter : IValueConverter
 {
     public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
     {
-        _ = int.TryParse(value?.ToString(), out var delay);
+        var delay = value.ToString().ToInt();
 
         return delay switch
         {
diff --git a/v2rayN/v2rayN.Desktop/ViewModels/ThemeSettingViewModel.cs b/v2rayN/v2rayN.Desktop/ViewModels/ThemeSettingViewModel.cs
index 2bfa5eaf..c84a2887 100644
--- a/v2rayN/v2rayN.Desktop/ViewModels/ThemeSettingViewModel.cs
+++ b/v2rayN/v2rayN.Desktop/ViewModels/ThemeSettingViewModel.cs
@@ -95,7 +95,9 @@ public class ThemeSettingViewModel : MyReactiveObject
     {
         double size = CurrentFontSize;
         if (size < Global.MinFontSize)
+        {
             return;
+        }
 
         Style style = new(x => Selectors.Or(
             x.OfType<Button>(),
diff --git a/v2rayN/v2rayN.Desktop/Views/AddGroupServerWindow.axaml.cs b/v2rayN/v2rayN.Desktop/Views/AddGroupServerWindow.axaml.cs
index a5692ffc..b630e2fb 100644
--- a/v2rayN/v2rayN.Desktop/Views/AddGroupServerWindow.axaml.cs
+++ b/v2rayN/v2rayN.Desktop/Views/AddGroupServerWindow.axaml.cs
@@ -95,7 +95,9 @@ public partial class AddGroupServerWindow : WindowBase<AddGroupServerViewModel>
     private void AddGroupServerWindow_KeyDown(object? sender, KeyEventArgs e)
     {
         if (!lstChild.IsKeyboardFocusWithin)
+        {
             return;
+        }
 
         if ((e.KeyModifiers & (KeyModifiers.Control | KeyModifiers.Meta)) != 0)
         {
diff --git a/v2rayN/v2rayN.Desktop/Views/MainWindow.axaml.cs b/v2rayN/v2rayN.Desktop/Views/MainWindow.axaml.cs
index f0d3d3a5..64063de8 100644
--- a/v2rayN/v2rayN.Desktop/Views/MainWindow.axaml.cs
+++ b/v2rayN/v2rayN.Desktop/Views/MainWindow.axaml.cs
@@ -22,8 +22,8 @@ public partial class MainWindow : WindowBase<MainWindowViewModel>
         _manager = new WindowNotificationManager(TopLevel.GetTopLevel(this)) { MaxItems = 3, Position = NotificationPosition.TopRight };
 
         KeyDown += MainWindow_KeyDown;
-        menuSettingsSetUWP.Click += menuSettingsSetUWP_Click;
-        menuPromotion.Click += menuPromotion_Click;
+        menuSettingsSetUWP.Click += MenuSettingsSetUWP_Click;
+        menuPromotion.Click += MenuPromotion_Click;
         menuCheckUpdate.Click += MenuCheckUpdate_Click;
         menuBackupAndRestore.Click += MenuBackupAndRestore_Click;
         menuClose.Click += MenuClose_Click;
@@ -188,6 +188,7 @@ public partial class MainWindow : WindowBase<MainWindowViewModel>
     private async Task DelegateSnackMsg(string content)
     {
         _manager?.Show(new Notification(null, content, NotificationType.Information));
+        await Task.CompletedTask;
     }
 
     private async Task<bool> UpdateViewHandler(EViewAction action, object? obj)
@@ -196,17 +197,26 @@ public partial class MainWindow : WindowBase<MainWindowViewModel>
         {
             case EViewAction.AddServerWindow:
                 if (obj is null)
+                {
                     return false;
+                }
+
                 return await new AddServerWindow((ProfileItem)obj).ShowDialog<bool>(this);
 
             case EViewAction.AddServer2Window:
                 if (obj is null)
+                {
                     return false;
+                }
+
                 return await new AddServer2Window((ProfileItem)obj).ShowDialog<bool>(this);
 
             case EViewAction.AddGroupServerWindow:
                 if (obj is null)
+                {
                     return false;
+                }
+
                 return await new AddGroupServerWindow((ProfileItem)obj).ShowDialog<bool>(this);
 
             case EViewAction.DNSSettingWindow:
@@ -308,12 +318,12 @@ public partial class MainWindow : WindowBase<MainWindowViewModel>
         }
     }
 
-    private void menuPromotion_Click(object? sender, RoutedEventArgs e)
+    private void MenuPromotion_Click(object? sender, RoutedEventArgs e)
     {
         ProcUtils.ProcessStart($"{Utils.Base64Decode(Global.PromotionUrl)}?t={DateTime.Now.Ticks}");
     }
 
-    private void menuSettingsSetUWP_Click(object? sender, RoutedEventArgs e)
+    private void MenuSettingsSetUWP_Click(object? sender, RoutedEventArgs e)
     {
         ProcUtils.ProcessStart(Utils.GetBinPath("EnableLoopback.exe"));
     }
@@ -478,8 +488,8 @@ public partial class MainWindow : WindowBase<MainWindowViewModel>
     {
         var coreInfo = CoreInfoManager.Instance.GetCoreInfo();
         foreach (var it in coreInfo
-            .Where(t => t.CoreType != ECoreType.v2fly
-                        && t.CoreType != ECoreType.hysteria))
+            .Where(t => t.CoreType is not ECoreType.v2fly
+                        and not ECoreType.hysteria))
         {
             var item = new MenuItem()
             {
diff --git a/v2rayN/v2rayN.Desktop/Views/MsgView.axaml.cs b/v2rayN/v2rayN.Desktop/Views/MsgView.axaml.cs
index cc9bf464..78b0a4a1 100644
--- a/v2rayN/v2rayN.Desktop/Views/MsgView.axaml.cs
+++ b/v2rayN/v2rayN.Desktop/Views/MsgView.axaml.cs
@@ -30,7 +30,9 @@ public partial class MsgView : ReactiveUserControl<MsgViewModel>
         {
             case EViewAction.DispatcherShowMsg:
                 if (obj is null)
+                {
                     return false;
+                }
 
                 Dispatcher.UIThread.Post(() => ShowMsg(obj),
                     DispatcherPriority.ApplicationIdle);
diff --git a/v2rayN/v2rayN.Desktop/Views/ProfilesView.axaml.cs b/v2rayN/v2rayN.Desktop/Views/ProfilesView.axaml.cs
index 754f6aa6..418d6d20 100644
--- a/v2rayN/v2rayN.Desktop/Views/ProfilesView.axaml.cs
+++ b/v2rayN/v2rayN.Desktop/Views/ProfilesView.axaml.cs
@@ -124,7 +124,10 @@ public partial class ProfilesView : ReactiveUserControl<ProfilesViewModel>
         {
             case EViewAction.SetClipboardData:
                 if (obj is null)
+                {
                     return false;
+                }
+
                 await AvaUtils.SetClipboardData(this, (string)obj);
                 break;
 
@@ -141,7 +144,10 @@ public partial class ProfilesView : ReactiveUserControl<ProfilesViewModel>
 
             case EViewAction.SaveFileDialog:
                 if (obj is null)
+                {
                     return false;
+                }
+
                 var fileName = await UI.SaveFileDialog(_window, "");
                 if (fileName.IsNullOrEmpty())
                 {
@@ -152,28 +158,43 @@ public partial class ProfilesView : ReactiveUserControl<ProfilesViewModel>
 
             case EViewAction.AddServerWindow:
                 if (obj is null)
+                {
                     return false;
+                }
+
                 return await new AddServerWindow((ProfileItem)obj).ShowDialog<bool>(_window);
 
             case EViewAction.AddServer2Window:
                 if (obj is null)
+                {
                     return false;
+                }
+
                 return await new AddServer2Window((ProfileItem)obj).ShowDialog<bool>(_window);
 
             case EViewAction.AddGroupServerWindow:
                 if (obj is null)
+                {
                     return false;
+                }
+
                 return await new AddGroupServerWindow((ProfileItem)obj).ShowDialog<bool>(_window);
 
             case EViewAction.ShareServer:
                 if (obj is null)
+                {
                     return false;
+                }
+
                 await ShareServer((string)obj);
                 break;
 
             case EViewAction.SubEditWindow:
                 if (obj is null)
+                {
                     return false;
+                }
+
                 return await new SubEditWindow((SubItem)obj).ShowDialog<bool>(_window);
 
             case EViewAction.DispatcherRefreshServersBiz:
@@ -215,14 +236,17 @@ public partial class ProfilesView : ReactiveUserControl<ProfilesViewModel>
     {
         var source = e.Source as Border;
         if (source?.Name == "HeaderBackground")
+        {
             return;
+        }
+
         if (_config.UiItem.DoubleClick2Activate)
         {
             ViewModel?.SetDefaultServer();
         }
         else
         {
-            ViewModel?.EditServerAsync(EConfigType.Custom);
+            ViewModel?.EditServerAsync();
         }
     }
 
@@ -263,7 +287,7 @@ public partial class ProfilesView : ReactiveUserControl<ProfilesViewModel>
                     break;
 
                 case Key.D:
-                    ViewModel?.EditServerAsync(EConfigType.Custom);
+                    ViewModel?.EditServerAsync();
                     break;
 
                 case Key.F:
diff --git a/v2rayN/v2rayN.Desktop/Views/RoutingRuleSettingWindow.axaml.cs b/v2rayN/v2rayN.Desktop/Views/RoutingRuleSettingWindow.axaml.cs
index 87e78de1..4e2f5e78 100644
--- a/v2rayN/v2rayN.Desktop/Views/RoutingRuleSettingWindow.axaml.cs
+++ b/v2rayN/v2rayN.Desktop/Views/RoutingRuleSettingWindow.axaml.cs
@@ -83,7 +83,10 @@ public partial class RoutingRuleSettingWindow : WindowBase<RoutingRuleSettingVie
 
             case EViewAction.RoutingRuleDetailsWindow:
                 if (obj is null)
+                {
                     return false;
+                }
+
                 return await new RoutingRuleDetailsWindow((RulesItem)obj).ShowDialog<bool>(this);
 
             case EViewAction.ImportRulesFromFile:
diff --git a/v2rayN/v2rayN.Desktop/Views/RoutingSettingWindow.axaml.cs b/v2rayN/v2rayN.Desktop/Views/RoutingSettingWindow.axaml.cs
index 80144750..72602e16 100644
--- a/v2rayN/v2rayN.Desktop/Views/RoutingSettingWindow.axaml.cs
+++ b/v2rayN/v2rayN.Desktop/Views/RoutingSettingWindow.axaml.cs
@@ -60,7 +60,10 @@ public partial class RoutingSettingWindow : WindowBase<RoutingSettingViewModel>
 
             case EViewAction.RoutingRuleSettingWindow:
                 if (obj is null)
+                {
                     return false;
+                }
+
                 return await new RoutingRuleSettingWindow((RoutingItem)obj).ShowDialog<bool>(this);
         }
         return await Task.FromResult(true);
diff --git a/v2rayN/v2rayN.Desktop/Views/StatusBarView.axaml.cs b/v2rayN/v2rayN.Desktop/Views/StatusBarView.axaml.cs
index e5ab59c9..c5d9ef80 100644
--- a/v2rayN/v2rayN.Desktop/Views/StatusBarView.axaml.cs
+++ b/v2rayN/v2rayN.Desktop/Views/StatusBarView.axaml.cs
@@ -56,7 +56,10 @@ public partial class StatusBarView : ReactiveUserControl<StatusBarViewModel>
 
             case EViewAction.SetClipboardData:
                 if (obj is null)
+                {
                     return false;
+                }
+
                 await AvaUtils.SetClipboardData(this, (string)obj);
                 break;
 
diff --git a/v2rayN/v2rayN.Desktop/Views/SubSettingWindow.axaml.cs b/v2rayN/v2rayN.Desktop/Views/SubSettingWindow.axaml.cs
index 970f5c5b..427031ea 100644
--- a/v2rayN/v2rayN.Desktop/Views/SubSettingWindow.axaml.cs
+++ b/v2rayN/v2rayN.Desktop/Views/SubSettingWindow.axaml.cs
@@ -49,14 +49,20 @@ public partial class SubSettingWindow : WindowBase<SubSettingViewModel>
 
             case EViewAction.SubEditWindow:
                 if (obj is null)
+                {
                     return false;
+                }
+
                 var window = new SubEditWindow((SubItem)obj);
                 await window.ShowDialog(this);
                 break;
 
             case EViewAction.ShareSub:
                 if (obj is null)
+                {
                     return false;
+                }
+
                 await ShareSub((string)obj);
                 break;
         }
diff --git a/v2rayN/v2rayN/Common/WindowsUtils.cs b/v2rayN/v2rayN/Common/WindowsUtils.cs
index cc05f56d..0bf149ca 100644
--- a/v2rayN/v2rayN/Common/WindowsUtils.cs
+++ b/v2rayN/v2rayN/Common/WindowsUtils.cs
@@ -76,7 +76,7 @@ internal static class WindowsUtils
     {
         using var key = Registry.CurrentUser.OpenSubKey(@"Software\Microsoft\Windows\CurrentVersion\Themes\Personalize");
         var obj = key?.GetValue("AppsUseLightTheme");
-        int.TryParse(obj?.ToString(), out var value);
+        var value = obj?.ToString().ToInt();
         return value == 0;
     }
 
diff --git a/v2rayN/v2rayN/Converters/DelayColorConverter.cs b/v2rayN/v2rayN/Converters/DelayColorConverter.cs
index 8fb8e239..4d8bb5c8 100644
--- a/v2rayN/v2rayN/Converters/DelayColorConverter.cs
+++ b/v2rayN/v2rayN/Converters/DelayColorConverter.cs
@@ -6,14 +6,14 @@ public class DelayColorConverter : IValueConverter
 {
     public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
     {
-        int.TryParse(value.ToString(), out var delay);
+        var delay = value.ToString().ToInt();
 
-        if (delay <= 0)
-            return new SolidColorBrush(Colors.Red);
-        if (delay <= 500)
-            return new SolidColorBrush(Colors.Green);
-        else
-            return new SolidColorBrush(Colors.IndianRed);
+        return delay switch
+        {
+            <= 0 => new SolidColorBrush(Colors.Red),
+            <= 500 => new SolidColorBrush(Colors.Green),
+            _ => new SolidColorBrush(Colors.IndianRed)
+        };
     }
 
     public object? ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
diff --git a/v2rayN/v2rayN/ViewModels/ThemeSettingViewModel.cs b/v2rayN/v2rayN/ViewModels/ThemeSettingViewModel.cs
index b92f2ff2..dfa12239 100644
--- a/v2rayN/v2rayN/ViewModels/ThemeSettingViewModel.cs
+++ b/v2rayN/v2rayN/ViewModels/ThemeSettingViewModel.cs
@@ -138,7 +138,9 @@ public class ThemeSettingViewModel : MyReactiveObject
     {
         double size = (long)CurrentFontSize;
         if (size < Global.MinFontSize)
+        {
             return;
+        }
 
         Application.Current.Resources["StdFontSize"] = size;
         Application.Current.Resources["StdFontSize1"] = size + 1;
diff --git a/v2rayN/v2rayN/Views/AddGroupServerWindow.xaml.cs b/v2rayN/v2rayN/Views/AddGroupServerWindow.xaml.cs
index e542c922..d7cf450c 100644
--- a/v2rayN/v2rayN/Views/AddGroupServerWindow.xaml.cs
+++ b/v2rayN/v2rayN/Views/AddGroupServerWindow.xaml.cs
@@ -78,7 +78,10 @@ public partial class AddGroupServerWindow
     private void AddGroupServerWindow_PreviewKeyDown(object sender, KeyEventArgs e)
     {
         if (!lstChild.IsKeyboardFocusWithin)
+        {
             return;
+        }
+
         if (Keyboard.IsKeyDown(Key.LeftCtrl) || Keyboard.IsKeyDown(Key.RightCtrl))
         {
             if (e.Key == Key.A)
diff --git a/v2rayN/v2rayN/Views/MainWindow.xaml.cs b/v2rayN/v2rayN/Views/MainWindow.xaml.cs
index f6bab699..a52f26b1 100644
--- a/v2rayN/v2rayN/Views/MainWindow.xaml.cs
+++ b/v2rayN/v2rayN/Views/MainWindow.xaml.cs
@@ -21,9 +21,9 @@ public partial class MainWindow
         App.Current.SessionEnding += Current_SessionEnding;
         Closing += MainWindow_Closing;
         PreviewKeyDown += MainWindow_PreviewKeyDown;
-        menuSettingsSetUWP.Click += menuSettingsSetUWP_Click;
-        menuPromotion.Click += menuPromotion_Click;
-        menuClose.Click += menuClose_Click;
+        menuSettingsSetUWP.Click += MenuSettingsSetUWP_Click;
+        menuPromotion.Click += MenuPromotion_Click;
+        menuClose.Click += MenuClose_Click;
         menuCheckUpdate.Click += MenuCheckUpdate_Click;
         menuBackupAndRestore.Click += MenuBackupAndRestore_Click;
 
@@ -178,6 +178,7 @@ public partial class MainWindow
     private async Task DelegateSnackMsg(string content)
     {
         MainSnackbar.MessageQueue?.Enqueue(content);
+        await Task.CompletedTask;
     }
 
     private async Task<bool> UpdateViewHandler(EViewAction action, object? obj)
@@ -186,17 +187,26 @@ public partial class MainWindow
         {
             case EViewAction.AddServerWindow:
                 if (obj is null)
+                {
                     return false;
+                }
+
                 return new AddServerWindow((ProfileItem)obj).ShowDialog() ?? false;
 
             case EViewAction.AddServer2Window:
                 if (obj is null)
+                {
                     return false;
+                }
+
                 return new AddServer2Window((ProfileItem)obj).ShowDialog() ?? false;
 
             case EViewAction.AddGroupServerWindow:
                 if (obj is null)
+                {
                     return false;
+                }
+
                 return new AddGroupServerWindow((ProfileItem)obj).ShowDialog() ?? false;
 
             case EViewAction.DNSSettingWindow:
@@ -297,18 +307,18 @@ public partial class MainWindow
         }
     }
 
-    private void menuClose_Click(object sender, RoutedEventArgs e)
+    private void MenuClose_Click(object sender, RoutedEventArgs e)
     {
         StorageUI();
         ShowHideWindow(false);
     }
 
-    private void menuPromotion_Click(object sender, RoutedEventArgs e)
+    private void MenuPromotion_Click(object sender, RoutedEventArgs e)
     {
         ProcUtils.ProcessStart($"{Utils.Base64Decode(Global.PromotionUrl)}?t={DateTime.Now.Ticks}");
     }
 
-    private void menuSettingsSetUWP_Click(object sender, RoutedEventArgs e)
+    private void MenuSettingsSetUWP_Click(object sender, RoutedEventArgs e)
     {
         ProcUtils.ProcessStart(Utils.GetBinPath("EnableLoopback.exe"));
     }
@@ -429,8 +439,8 @@ public partial class MainWindow
     {
         var coreInfo = CoreInfoManager.Instance.GetCoreInfo();
         foreach (var it in coreInfo
-            .Where(t => t.CoreType != ECoreType.v2fly
-                        && t.CoreType != ECoreType.hysteria))
+            .Where(t => t.CoreType is not ECoreType.v2fly
+                        and not ECoreType.hysteria))
         {
             var item = new MenuItem()
             {
diff --git a/v2rayN/v2rayN/Views/MsgView.xaml.cs b/v2rayN/v2rayN/Views/MsgView.xaml.cs
index 683e0787..bccb4a5e 100644
--- a/v2rayN/v2rayN/Views/MsgView.xaml.cs
+++ b/v2rayN/v2rayN/Views/MsgView.xaml.cs
@@ -30,7 +30,10 @@ public partial class MsgView
         {
             case EViewAction.DispatcherShowMsg:
                 if (obj is null)
+                {
                     return false;
+                }
+
                 Application.Current?.Dispatcher.Invoke(() =>
                 {
                     ShowMsg(obj);
diff --git a/v2rayN/v2rayN/Views/ProfilesView.xaml.cs b/v2rayN/v2rayN/Views/ProfilesView.xaml.cs
index 59e42b7b..7dae358c 100644
--- a/v2rayN/v2rayN/Views/ProfilesView.xaml.cs
+++ b/v2rayN/v2rayN/Views/ProfilesView.xaml.cs
@@ -109,7 +109,10 @@ public partial class ProfilesView
         {
             case EViewAction.SetClipboardData:
                 if (obj is null)
+                {
                     return false;
+                }
+
                 WindowsUtils.SetClipboardData((string)obj);
                 break;
 
@@ -126,7 +129,10 @@ public partial class ProfilesView
 
             case EViewAction.SaveFileDialog:
                 if (obj is null)
+                {
                     return false;
+                }
+
                 if (UI.SaveFileDialog(out var fileName, "Config|*.json") != true)
                 {
                     return false;
@@ -136,28 +142,43 @@ public partial class ProfilesView
 
             case EViewAction.AddServerWindow:
                 if (obj is null)
+                {
                     return false;
+                }
+
                 return new AddServerWindow((ProfileItem)obj).ShowDialog() ?? false;
 
             case EViewAction.AddServer2Window:
                 if (obj is null)
+                {
                     return false;
+                }
+
                 return new AddServer2Window((ProfileItem)obj).ShowDialog() ?? false;
 
             case EViewAction.AddGroupServerWindow:
                 if (obj is null)
+                {
                     return false;
+                }
+
                 return new AddGroupServerWindow((ProfileItem)obj).ShowDialog() ?? false;
 
             case EViewAction.ShareServer:
                 if (obj is null)
+                {
                     return false;
+                }
+
                 ShareServer((string)obj);
                 break;
 
             case EViewAction.SubEditWindow:
                 if (obj is null)
+                {
                     return false;
+                }
+
                 return new SubEditWindow((SubItem)obj).ShowDialog() ?? false;
 
             case EViewAction.DispatcherRefreshServersBiz:
@@ -209,7 +230,7 @@ public partial class ProfilesView
         }
         else
         {
-            ViewModel?.EditServerAsync(EConfigType.Custom);
+            ViewModel?.EditServerAsync();
         }
     }
 
@@ -245,7 +266,7 @@ public partial class ProfilesView
                     break;
 
                 case Key.D:
-                    ViewModel?.EditServerAsync(EConfigType.Custom);
+                    ViewModel?.EditServerAsync();
                     break;
 
                 case Key.F:
@@ -424,15 +445,22 @@ public partial class ProfilesView
         {
             // Get the dragged Item
             if (sender is not DataGrid listView)
+            {
                 return;
+            }
+
             var listViewItem = FindAncestor<DataGridRow>((DependencyObject)e.OriginalSource);
             if (listViewItem == null)
+            {
                 return;           // Abort
-                                  // Find the data behind the ListViewItem
+            }
+            // Find the data behind the ListViewItem
             var item = (ProfileItemModel)listView.ItemContainerGenerator.ItemFromContainer(listViewItem);
             if (item == null)
+            {
                 return;                   // Abort
-                                          // Initialize the drag & drop operation
+            }
+            // Initialize the drag & drop operation
             startIndex = lstProfiles.SelectedIndex;
             DataObject dragData = new(formatData, item);
             DragDrop.DoDragDrop(listViewItem, dragData, DragDropEffects.Copy | DragDropEffects.Move);
@@ -453,7 +481,10 @@ public partial class ProfilesView
         {
             // Get the drop Item destination
             if (sender is not DataGrid listView)
+            {
                 return;
+            }
+
             var listViewItem = FindAncestor<DataGridRow>((DependencyObject)e.OriginalSource);
             if (listViewItem == null)
             {
@@ -464,7 +495,9 @@ public partial class ProfilesView
             // Find the data behind the Item
             var item = (ProfileItemModel)listView.ItemContainerGenerator.ItemFromContainer(listViewItem);
             if (item == null)
+            {
                 return;
+            }
             // Move item into observable collection
             // (this will be automatically reflected to lstView.ItemsSource)
             e.Effects = DragDropEffects.Move;
diff --git a/v2rayN/v2rayN/Views/RoutingRuleSettingWindow.xaml.cs b/v2rayN/v2rayN/Views/RoutingRuleSettingWindow.xaml.cs
index b72dfc37..6069ee1f 100644
--- a/v2rayN/v2rayN/Views/RoutingRuleSettingWindow.xaml.cs
+++ b/v2rayN/v2rayN/Views/RoutingRuleSettingWindow.xaml.cs
@@ -79,7 +79,10 @@ public partial class RoutingRuleSettingWindow
             case EViewAction.RoutingRuleDetailsWindow:
 
                 if (obj is null)
+                {
                     return false;
+                }
+
                 return new RoutingRuleDetailsWindow((RulesItem)obj).ShowDialog() ?? false;
 
             case EViewAction.ImportRulesFromFile:
@@ -93,7 +96,10 @@ public partial class RoutingRuleSettingWindow
 
             case EViewAction.SetClipboardData:
                 if (obj is null)
+                {
                     return false;
+                }
+
                 WindowsUtils.SetClipboardData((string)obj);
                 break;
 
@@ -117,7 +123,10 @@ public partial class RoutingRuleSettingWindow
     private void RoutingRuleSettingWindow_PreviewKeyDown(object sender, KeyEventArgs e)
     {
         if (!lstRules.IsKeyboardFocusWithin)
+        {
             return;
+        }
+
         if (Keyboard.IsKeyDown(Key.LeftCtrl) || Keyboard.IsKeyDown(Key.RightCtrl))
         {
             if (e.Key == Key.A)
diff --git a/v2rayN/v2rayN/Views/RoutingSettingWindow.xaml.cs b/v2rayN/v2rayN/Views/RoutingSettingWindow.xaml.cs
index 588ea228..996b3786 100644
--- a/v2rayN/v2rayN/Views/RoutingSettingWindow.xaml.cs
+++ b/v2rayN/v2rayN/Views/RoutingSettingWindow.xaml.cs
@@ -57,7 +57,10 @@ public partial class RoutingSettingWindow
             case EViewAction.RoutingRuleSettingWindow:
 
                 if (obj is null)
+                {
                     return false;
+                }
+
                 return new RoutingRuleSettingWindow((RoutingItem)obj).ShowDialog() ?? false;
         }
         return await Task.FromResult(true);
diff --git a/v2rayN/v2rayN/Views/StatusBarView.xaml.cs b/v2rayN/v2rayN/Views/StatusBarView.xaml.cs
index 47cf90bf..ab9e16b2 100644
--- a/v2rayN/v2rayN/Views/StatusBarView.xaml.cs
+++ b/v2rayN/v2rayN/Views/StatusBarView.xaml.cs
@@ -80,7 +80,10 @@ public partial class StatusBarView
 
             case EViewAction.SetClipboardData:
                 if (obj is null)
+                {
                     return false;
+                }
+
                 WindowsUtils.SetClipboardData((string)obj);
                 break;
         }
diff --git a/v2rayN/v2rayN/Views/SubSettingWindow.xaml.cs b/v2rayN/v2rayN/Views/SubSettingWindow.xaml.cs
index 2e4ffe8f..6b389bc9 100644
--- a/v2rayN/v2rayN/Views/SubSettingWindow.xaml.cs
+++ b/v2rayN/v2rayN/Views/SubSettingWindow.xaml.cs
@@ -46,12 +46,18 @@ public partial class SubSettingWindow
 
             case EViewAction.SubEditWindow:
                 if (obj is null)
+                {
                     return false;
+                }
+
                 return new SubEditWindow((SubItem)obj).ShowDialog() ?? false;
 
             case EViewAction.ShareSub:
                 if (obj is null)
+                {
                     return false;
+                }
+
                 ShareSub((string)obj);
                 break;
         }