C# language usage improvements

v2rayN/v2rayN/Base/HttpClientHelper.cs

@@ -2,7 +2,6 @@
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
-using System.Net;
 using System.Net.Http;
 using System.Net.Http.Headers;
 using System.Threading;
@@ -58,7 +57,7 @@ namespace v2rayN.Base
             HttpResponseMessage response = await client.GetAsync(url, token);
             if (!response.IsSuccessStatusCode)
             {
-                throw new Exception(string.Format("The request returned with HTTP status code {0}", response.StatusCode));
+                throw new Exception($"The request returned with HTTP status code {response.StatusCode}");
             }
             return await response.Content.ReadAsStringAsync();
         }
@@ -77,11 +76,11 @@ namespace v2rayN.Base
         {
             if (string.IsNullOrEmpty(url))
             {
-                throw new ArgumentNullException("url");
+                throw new ArgumentNullException(nameof(url));
             }
             if (string.IsNullOrEmpty(fileName))
             {
-                throw new ArgumentNullException("fileName");
+                throw new ArgumentNullException(nameof(fileName));
             }
             if (File.Exists(fileName))
             {
@@ -92,16 +91,14 @@ namespace v2rayN.Base
 
             if (!response.IsSuccessStatusCode)
             {
-                throw new Exception(string.Format("The request returned with HTTP status code {0}", response.StatusCode));
+                throw new Exception($"The request returned with HTTP status code {response.StatusCode}");
             }
 
-            var total = response.Content.Headers.ContentLength.HasValue ? response.Content.Headers.ContentLength.Value : -1L;
+            var total = response.Content.Headers.ContentLength ?? -1L;
             var canReportProgress = total != -1 && progress != null;
 
-            using (var stream = await response.Content.ReadAsStreamAsync())
+            using var stream = await response.Content.ReadAsStreamAsync();
-            {
+            using var file = File.Create(fileName);
-                using (var file = File.Create(fileName))
-                {
             var totalRead = 0L;
             var buffer = new byte[1024 * 1024];
             var isMoreToRead = true;
@@ -123,7 +120,7 @@ namespace v2rayN.Base
                     buffer.ToList().CopyTo(0, data, 0, read);
 
                     // TODO: put here the code to write the file to disk
-                            file.Write(data, 0, read);
+                    await file.WriteAsync(data, 0, read, token);
 
                     totalRead += read;
 
@@ -145,28 +142,25 @@ namespace v2rayN.Base
 
             }
         }
-            }
-        }
 
         public async Task DownloadDataAsync4Speed(HttpClient client, string url, IProgress<string> progress, CancellationToken token)
         {
             if (string.IsNullOrEmpty(url))
             {
-                throw new ArgumentNullException("url");
+                throw new ArgumentNullException(nameof(url));
             }
 
             var response = await client.GetAsync(url, HttpCompletionOption.ResponseHeadersRead, token);
 
             if (!response.IsSuccessStatusCode)
             {
-                throw new Exception(string.Format("The request returned with HTTP status code {0}", response.StatusCode));
+                throw new Exception($"The request returned with HTTP status code {response.StatusCode}");
             }
 
             //var total = response.Content.Headers.ContentLength.HasValue ? response.Content.Headers.ContentLength.Value : -1L;
             //var canReportProgress = total != -1 && progress != null;
 
-            using (var stream = await response.Content.ReadAsStreamAsync())
+            using var stream = await response.Content.ReadAsStreamAsync();
-            {
             var totalRead = 0L;
             var buffer = new byte[1024 * 64];
             var isMoreToRead = true;
@@ -214,7 +208,6 @@ namespace v2rayN.Base
                 }
             } while (isMoreToRead);
         }
-        }
 
     }
 }

v2rayN/v2rayN/Base/ListViewFlickerFree.cs

@@ -76,14 +76,7 @@ namespace v2rayN.Base
                 Rectangle itemBounds = GetItemRect(targetIndex);
                 EnsureVisible(targetIndex);
 
-                if (targetPoint.Y > itemBounds.Top + (itemBounds.Height / 2))
+                InsertionMark.AppearsAfterItem = targetPoint.Y > itemBounds.Top + (itemBounds.Height / 2);
-                {
-                    InsertionMark.AppearsAfterItem = true;
-                }
-                else
-                {
-                    InsertionMark.AppearsAfterItem = false;
-                }
             }
             InsertionMark.Index = targetIndex;
         }

v2rayN/v2rayN/Base/StringEx.cs

@@ -36,8 +36,7 @@ namespace v2rayN.Base
 
         public static IEnumerable<string> NonWhiteSpaceLines(this TextReader reader)
         {
-            string line;
+            while (reader.ReadLine() is { } line)
-            while ((line = reader.ReadLine()) != null)
             {
                 if (line.IsWhiteSpace()) continue;
                 yield return line;

v2rayN/v2rayN/Forms/AddServer2Form.cs

@@ -1,7 +1,6 @@
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
-using System.IO;
 using System.Windows.Forms;
 using v2rayN.Handler;
 using v2rayN.Mode;

v2rayN/v2rayN/Forms/AddServerForm.cs

@@ -1,5 +1,4 @@
 using System;
-using System.Collections.Generic;
 using System.Windows.Forms;
 using v2rayN.Handler;
 using v2rayN.Mode;

v2rayN/v2rayN/Forms/BaseServerForm.cs

@@ -1,6 +1,4 @@
-using System;
+using v2rayN.Mode;
-using System.Windows.Forms;
-using v2rayN.Mode;
 
 namespace v2rayN.Forms
 {

v2rayN/v2rayN/Forms/GlobalHotkeySettingForm.cs

@@ -1,7 +1,6 @@
 using System;
 using System.Collections.Generic;
 using System.Windows.Forms;
-using v2rayN.Base;
 using v2rayN.Handler;
 using v2rayN.Mode;
 using v2rayN.Resx;
@@ -18,10 +17,7 @@ namespace v2rayN.Forms
 
         private void GlobalHotkeySettingForm_Load(object sender, EventArgs e)
         {
-            if (config.globalHotkeys == null)
+            config.globalHotkeys ??= new List<KeyEventItem>();
-            {
-                config.globalHotkeys = new List<KeyEventItem>();
-            }
 
             foreach (EGlobalHotkey it in Enum.GetValues(typeof(EGlobalHotkey)))
             {

v2rayN/v2rayN/Forms/GroupSettingControl.cs

@@ -1,7 +1,6 @@
 using System;
 using System.Windows.Forms;
 using v2rayN.Base;
-using v2rayN.Handler;
 using v2rayN.Mode;
 
 namespace v2rayN.Forms

v2rayN/v2rayN/Forms/GroupSettingForm.cs

@@ -18,10 +18,7 @@ namespace v2rayN.Forms
 
         private void GroupSettingForm_Load(object sender, EventArgs e)
         {
-            if (config.groupItem == null)
+            config.groupItem ??= new List<GroupItem>();
-            {
-                config.groupItem = new List<GroupItem>();
-            }
 
             RefreshGroupsView();
         }

v2rayN/v2rayN/Forms/MainForm.cs

@@ -63,14 +63,7 @@ namespace v2rayN.Forms
         private void MainForm_VisibleChanged(object sender, EventArgs e)
         {
             if (statistics == null || !statistics.Enable) return;
-            if ((sender as Form).Visible)
+            statistics.UpdateUI = (sender as Form).Visible;
-            {
-                statistics.UpdateUI = true;
-            }
-            else
-            {
-                statistics.UpdateUI = false;
-            }
         }
 
         private void MainForm_Shown(object sender, EventArgs e)
@@ -232,10 +225,7 @@ namespace v2rayN.Forms
                 .ToList();
 
             ConfigHandler.SetDefaultServer(config, lstVmess);
-            BeginInvoke(new Action(() =>
+            BeginInvoke(new Action(RefreshServersView));
-            {
-                RefreshServersView();
-            }));
 
             RefreshServersMenu();
         }
@@ -319,7 +309,7 @@ namespace v2rayN.Forms
                 Utils.AddSubItem(lvItem, EServerColName.subRemarks.ToString(), item.GetSubRemarks(config));
                 Utils.AddSubItem(lvItem, EServerColName.testResult.ToString(), item.testResult);
 
-                if (statistics != null && statistics.Enable)
+                if (statistics is { Enable: true })
                 {
                     string totalUp = string.Empty,
                         totalDown = string.Empty,
@@ -1048,10 +1038,7 @@ namespace v2rayN.Forms
         {
             HideForm();
 
-            string result = await Task.Run(() =>
+            string result = await Task.Run(Utils.ScanScreen);
-            {
-                return Utils.ScanScreen();
-            });
 
             ShowForm();
 
@@ -1234,7 +1221,7 @@ namespace v2rayN.Forms
             {
                 up /= (ulong)(config.statisticsFreshRate);
                 down /= (ulong)(config.statisticsFreshRate);
-                mainMsgControl.SetToolSslInfo("speed", string.Format("{0}/s↑ | {1}/s↓", Utils.HumanFy(up), Utils.HumanFy(down)));
+                mainMsgControl.SetToolSslInfo("speed", $"{Utils.HumanFy(up)}/s↑ | {Utils.HumanFy(down)}/s↓");
 
                 foreach (var it in statistics)
                 {
@@ -1560,7 +1547,7 @@ namespace v2rayN.Forms
             for (int k = 0; k < config.routings.Count; k++)
             {
                 var item = config.routings[k];
-                if (item.locked == true)
+                if (item.locked)
                 {
                     continue;
                 }

v2rayN/v2rayN/Forms/MainMsgControl.cs

@@ -1,12 +1,6 @@
 using System;
-using System.Collections.Generic;
-using System.ComponentModel;
-using System.Data;
-using System.Drawing;
-using System.Linq;
 using System.Text;
 using System.Text.RegularExpressions;
-using System.Threading.Tasks;
 using System.Windows.Forms;
 using v2rayN.Base;
 using v2rayN.Mode;
@@ -89,14 +83,9 @@ namespace v2rayN.Forms
             sb.Append($"{ResUI.LabLocal}:");
             sb.Append($"[{Global.InboundSocks}:{config.GetLocalPort(Global.InboundSocks)}]");
             sb.Append(" | ");
-            if (config.sysProxyType == ESysProxyType.ForcedChange)
+            sb.Append(config.sysProxyType == ESysProxyType.ForcedChange
-            {
+                ? $"[{Global.InboundHttp}({ResUI.SystemProxy}):{config.GetLocalPort(Global.InboundHttp)}]"
-                sb.Append($"[{Global.InboundHttp}({ResUI.SystemProxy}):{config.GetLocalPort(Global.InboundHttp)}]");
+                : $"[{Global.InboundHttp}:{config.GetLocalPort(Global.InboundHttp)}]");
-            }
-            else
-            {
-                sb.Append($"[{Global.InboundHttp}:{config.GetLocalPort(Global.InboundHttp)}]");
-            }
 
             if (config.inbound[0].allowLANConn)
             {

v2rayN/v2rayN/Forms/MsgFilterSetForm.cs

@@ -1,11 +1,4 @@
 using System;
-using System.Collections.Generic;
-using System.ComponentModel;
-using System.Data;
-using System.Drawing;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 using System.Windows.Forms;
 
 namespace v2rayN.Forms

v2rayN/v2rayN/Forms/OptionSettingForm.cs

@@ -106,10 +106,7 @@ namespace v2rayN.Forms
 
         private void InitCoreType()
         {
-            if (config.coreTypeItem == null)
+            config.coreTypeItem ??= new List<CoreTypeItem>();
-            {
-                config.coreTypeItem = new List<CoreTypeItem>();
-            }
 
             foreach (EConfigType it in Enum.GetValues(typeof(EConfigType)))
             {

v2rayN/v2rayN/Forms/RoutingRuleSettingDetailsForm.cs

@@ -3,7 +3,6 @@ using System.Collections.Generic;
 using System.Diagnostics;
 using System.Windows.Forms;
 using v2rayN.Base;
-using v2rayN.Handler;
 using v2rayN.Mode;
 using v2rayN.Resx;
 
@@ -118,12 +117,9 @@ namespace v2rayN.Forms
             EndBindingData();
 
             bool hasRule =
-                rulesItem.domain != null 
+                rulesItem.domain is { Count: > 0 }
-                && rulesItem.domain.Count > 0 
+                || rulesItem.ip is { Count: > 0 }
-                || rulesItem.ip != null 
+                || rulesItem.protocol is { Count: > 0 }
-                && rulesItem.ip.Count > 0 
-                || rulesItem.protocol != null 
-                && rulesItem.protocol.Count > 0 
                 || !Utils.IsNullOrEmpty(rulesItem.port);
 
             if (!hasRule)

v2rayN/v2rayN/Forms/RoutingRuleSettingForm.cs

@@ -2,7 +2,6 @@
 using System.Collections.Generic;
 using System.Threading.Tasks;
 using System.Windows.Forms;
-using v2rayN.Base;
 using v2rayN.Handler;
 using v2rayN.Mode;
 using v2rayN.Resx;
@@ -26,10 +25,7 @@ namespace v2rayN.Forms
         private void RoutingRuleSettingForm_Load(object sender, EventArgs e)
         {
             routingItem = EditIndex >= 0 ? config.routings[EditIndex] : new RoutingItem();
-            if (routingItem.rules == null)
+            routingItem.rules ??= new List<RulesItem>();
-            {
-                routingItem.rules = new List<RulesItem>();
-            }
 
             txtRemarks.Text = routingItem.remarks ?? string.Empty;
             txtUrl.Text = routingItem.url ?? string.Empty;
@@ -351,11 +347,7 @@ namespace v2rayN.Forms
         }
         private int AddBatchRoutingRules(ref RoutingItem routingItem, string clipboardData)
         {
-            bool blReplace = false;
+            bool blReplace = UI.ShowYesNo(ResUI.AddBatchRoutingRulesYesNo) == DialogResult.No;
-            if (UI.ShowYesNo(ResUI.AddBatchRoutingRulesYesNo) == DialogResult.No)
-            {
-                blReplace = true;
-            }
             return ConfigHandler.AddBatchRoutingRules(ref routingItem, clipboardData, blReplace);
         }
 

v2rayN/v2rayN/Forms/RoutingSettingForm.cs

@@ -26,10 +26,7 @@ namespace v2rayN.Forms
             chkenableRoutingAdvanced.Checked = config.enableRoutingAdvanced;
             cmbdomainMatcher.Text = config.domainMatcher;
 
-            if (config.routings == null)
+            config.routings ??= new List<RoutingItem>();
-            {
-                config.routings = new List<RoutingItem>();
-            }
             InitRoutingsView();
             RefreshRoutingsView();
 
@@ -162,7 +159,7 @@ namespace v2rayN.Forms
             for (int k = 0; k < config.routings.Count; k++)
             {
                 var item = config.routings[k];
-                if (item.locked == true)
+                if (item.locked)
                 {
                     continue;
                 }

v2rayN/v2rayN/Forms/SubSettingControl.cs

@@ -62,14 +62,7 @@ namespace v2rayN.Forms
                 subItem.userAgent = txtUserAgent.Text.TrimEx();
 
                 var index = groupItem.FindIndex(t => t.remarks == cmbGroup.Text);
-                if (index >= 0)
+                subItem.groupId = index >= 0 ? groupItem[index].id : string.Empty;
-                {
-                    subItem.groupId = groupItem[index].id;
-                }
-                else
-                {
-                    subItem.groupId = string.Empty;
-                }
             }
         }
         private void txtRemarks_Leave(object sender, EventArgs e)

v2rayN/v2rayN/Forms/SubSettingForm.cs

@@ -18,10 +18,7 @@ namespace v2rayN.Forms
 
         private void SubSettingForm_Load(object sender, EventArgs e)
         {
-            if (config.subItem == null)
+            config.subItem ??= new List<SubItem>();
-            {
-                config.subItem = new List<SubItem>();
-            }
 
             RefreshSubsView();
         }

v2rayN/v2rayN/Handler/ConfigHandler.cs

@@ -1,12 +1,10 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
-using System.Net;
 using v2rayN.Mode;
 using v2rayN.Base;
 using System.Linq;
 using v2rayN.Tool;
-using System.Threading.Tasks;
 
 namespace v2rayN.Handler
 {
@@ -101,9 +99,7 @@ namespace v2rayN.Handler
             //}
 
             //kcp
-            if (config.kcpItem == null)
+            config.kcpItem ??= new KcpItem
-            {
-                config.kcpItem = new KcpItem
             {
                 mtu = 1350,
                 tti = 50,
@@ -113,24 +109,12 @@ namespace v2rayN.Handler
                 writeBufferSize = 2,
                 congestion = false
             };
-            }
+            config.uiItem ??= new UIItem()
-            if (config.uiItem == null)
-            {
-                config.uiItem = new UIItem()
             {
                 enableAutoAdjustMainLvColWidth = true
             };
-            }
+            config.uiItem.mainLvColWidth ??= new Dictionary<string, int>();
-            if (config.uiItem.mainLvColWidth == null)
+            config.constItem ??= new ConstItem();
-            {
-                config.uiItem.mainLvColWidth = new Dictionary<string, int>();
-            }
-
-
-            if (config.constItem == null)
-            {
-                config.constItem = new ConstItem();
-            }
             if (Utils.IsNullOrEmpty(config.constItem.speedTestUrl))
             {
                 config.constItem.speedTestUrl = Global.SpeedTestUrl;
@@ -148,15 +132,9 @@ namespace v2rayN.Handler
             //    config.remoteDNS = "1.1.1.1";
             //}
 
-            if (config.subItem == null)
+            config.subItem ??= new List<SubItem>();
-            {
+            config.groupItem ??= new List<GroupItem>();
-                config.subItem = new List<SubItem>();
+            if (config.statisticsFreshRate is > 100 or < 1)
-            }
-            if (config.groupItem == null)
-            {
-                config.groupItem = new List<GroupItem>();
-            }
-            if (config.statisticsFreshRate > 100 || config.statisticsFreshRate < 1)
             {
                 config.statisticsFreshRate = 1;
             }
@@ -1260,10 +1238,7 @@ namespace v2rayN.Handler
 
         public static int AddformMainLvColWidth(ref Config config, string name, int width)
         {
-            if (config.uiItem.mainLvColWidth == null)
+            config.uiItem.mainLvColWidth ??= new Dictionary<string, int>();
-            {
-                config.uiItem.mainLvColWidth = new Dictionary<string, int>();
-            }
             if (config.uiItem.mainLvColWidth.ContainsKey(name))
             {
                 config.uiItem.mainLvColWidth[name] = width;
@@ -1278,18 +1253,8 @@ namespace v2rayN.Handler
         }
         public static int GetformMainLvColWidth(ref Config config, string name, int width)
         {
-            if (config.uiItem.mainLvColWidth == null)
+            config.uiItem.mainLvColWidth ??= new Dictionary<string, int>();
-            {
+            return config.uiItem.mainLvColWidth.ContainsKey(name) ? config.uiItem.mainLvColWidth[name] : width;
-                config.uiItem.mainLvColWidth = new Dictionary<string, int>();
-            }
-            if (config.uiItem.mainLvColWidth.ContainsKey(name))
-            {
-                return config.uiItem.mainLvColWidth[name];
-            }
-            else
-            {
-                return width;
-            }
         }
 
         #endregion
@@ -1308,7 +1273,7 @@ namespace v2rayN.Handler
 
             }
             //move locked item
-            int index = config.routings.FindIndex(it => it.locked == true);
+            int index = config.routings.FindIndex(it => it.locked);
             if (index != -1)
             {
                 var item = Utils.DeepCopy(config.routings[index]);
@@ -1339,7 +1304,7 @@ namespace v2rayN.Handler
             else
             {
                 config.routings.Add(item);
-                int indexLocked = config.routings.FindIndex(it => it.locked == true);
+                int indexLocked = config.routings.FindIndex(it => it.locked);
                 if (indexLocked != -1)
                 {
                     var itemLocked = Utils.DeepCopy(config.routings[indexLocked]);
@@ -1370,10 +1335,7 @@ namespace v2rayN.Handler
             {
                 return -1;
             }
-            if (routingItem.rules == null)
+            routingItem.rules ??= new List<RulesItem>();
-            {
-                routingItem.rules = new List<RulesItem>();
-            }
             if (blReplace)
             {
                 routingItem.rules.Clear();
@@ -1485,10 +1447,7 @@ namespace v2rayN.Handler
 
         public static int InitBuiltinRouting(ref Config config, bool blImportAdvancedRules = false)
         {
-            if (config.routings == null)
+            config.routings ??= new List<RoutingItem>();
-            {
-                config.routings = new List<RoutingItem>();
-            }
 
             if (blImportAdvancedRules || config.routings.Count(it => it.locked != true) <= 0)
             {
@@ -1543,11 +1502,7 @@ namespace v2rayN.Handler
 
         public static RoutingItem GetLockedRoutingItem(ref Config config)
         {
-            if (config.routings == null)
+            return config.routings?.Find(it => it.locked);
-            {
-                return null;
-            }
-            return config.routings.Find(it => it.locked == true);
         }
         #endregion
     }

v2rayN/v2rayN/Handler/DownloadHandle.cs

@@ -5,7 +5,6 @@ using System.Net;
 using System.Net.Http;
 using System.Net.Http.Headers;
 using System.Net.Sockets;
-using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
 using v2rayN.Base;

v2rayN/v2rayN/Handler/LazyConfig.cs

@@ -48,11 +48,7 @@ namespace v2rayN.Handler
                 return ECoreType.Xray;
             }
             var item = _config.coreTypeItem.FirstOrDefault(it => it.configType == eConfigType);
-            if (item == null)
+            return item?.coreType ?? ECoreType.Xray;
-            {
-                return ECoreType.Xray;
-            }
-            return item.coreType;
         }
 
         public CoreInfo GetCoreInfo(ECoreType coreType)
@@ -61,23 +57,22 @@ namespace v2rayN.Handler
             {
                 InitCoreInfo();
             }
-            return coreInfos.Where(t => t.coreType == coreType).FirstOrDefault();
+            return coreInfos.FirstOrDefault(t => t.coreType == coreType);
         }
 
         private void InitCoreInfo()
         {
-            coreInfos = new List<CoreInfo>();
+            coreInfos = new List<CoreInfo>
-
+            {
-            coreInfos.Add(new CoreInfo
+                new CoreInfo
                 {
                     coreType = ECoreType.v2rayN,
                     coreUrl = Global.NUrl,
                     coreReleaseApiUrl = Global.NUrl.Replace(@"https://github.com", @"https://api.github.com/repos"),
                     coreDownloadUrl32 = Global.NUrl + "/download/{0}/v2rayN.zip",
                     coreDownloadUrl64 = Global.NUrl + "/download/{0}/v2rayN.zip",
-            });
+                },
-
+                new CoreInfo
-            coreInfos.Add(new CoreInfo
                 {
                     coreType = ECoreType.v2fly,
                     coreExes = new List<string> { "wv2ray", "v2ray" },
@@ -89,9 +84,8 @@ namespace v2rayN.Handler
                     match = "V2Ray",
                     versionArg = "-version",
                     redirectInfo = true,
-            });
+                },
-
+                new CoreInfo
-            coreInfos.Add(new CoreInfo
                 {
                     coreType = ECoreType.SagerNet,
                     coreExes = new List<string> { "SagerNet", "v2ray" },
@@ -103,9 +97,8 @@ namespace v2rayN.Handler
                     match = "V2Ray",
                     versionArg = "version",
                     redirectInfo = true,
-            });
+                },
-
+                new CoreInfo
-            coreInfos.Add(new CoreInfo
                 {
                     coreType = ECoreType.v2fly_v5,
                     coreExes = new List<string> { "v2ray" },
@@ -117,9 +110,8 @@ namespace v2rayN.Handler
                     match = "V2Ray",
                     versionArg = "version",
                     redirectInfo = true,
-            });
+                },
-
+                new CoreInfo
-            coreInfos.Add(new CoreInfo
                 {
                     coreType = ECoreType.Xray,
                     coreExes = new List<string> { "xray" },
@@ -131,9 +123,8 @@ namespace v2rayN.Handler
                     match = "Xray",
                     versionArg = "-version",
                     redirectInfo = true,
-            });
+                },
-
+                new CoreInfo
-            coreInfos.Add(new CoreInfo
                 {
                     coreType = ECoreType.clash,
                     coreExes = new List<string> { "clash-windows-amd64-v3", "clash-windows-amd64", "clash-windows-386", "clash" },
@@ -145,9 +136,8 @@ namespace v2rayN.Handler
                     match = "v",
                     versionArg = "-v",
                     redirectInfo = true,
-            });
+                },
-
+                new CoreInfo
-            coreInfos.Add(new CoreInfo
                 {
                     coreType = ECoreType.clash_meta,
                     coreExes = new List<string> { "Clash.Meta-windows-amd64-compatible", "Clash.Meta-windows-amd64", "Clash.Meta-windows-386", "Clash.Meta", "clash" },
@@ -159,9 +149,8 @@ namespace v2rayN.Handler
                     match = "v",
                     versionArg = "-v",
                     redirectInfo = true,
-            });
+                },
-
+                new CoreInfo
-            coreInfos.Add(new CoreInfo
                 {
                     coreType = ECoreType.hysteria,
                     coreExes = new List<string> { "hysteria-windows-amd64", "hysteria-windows-386", "hysteria" },
@@ -171,34 +160,32 @@ namespace v2rayN.Handler
                     coreDownloadUrl32 = Global.hysteriaCoreUrl + "/download/{0}/hysteria-windows-386.exe",
                     coreDownloadUrl64 = Global.hysteriaCoreUrl + "/download/{0}/hysteria-windows-amd64.exe",
                     redirectInfo = true,
-            });
+                },
-
+                new CoreInfo
-            coreInfos.Add(new CoreInfo
                 {
                     coreType = ECoreType.naiveproxy,
                     coreExes = new List<string> { "naiveproxy", "naive" },
                     arguments = "config.json",
                     coreUrl = Global.naiveproxyCoreUrl,
                     redirectInfo = false,
-            });
+                },
-
+                new CoreInfo
-            coreInfos.Add(new CoreInfo
                 {
                     coreType = ECoreType.tuic,
                     coreExes = new List<string> { "tuic-client", "tuic" },
                     arguments = "-c config.json",
                     coreUrl = Global.tuicCoreUrl,
                     redirectInfo = true,
-            });
+                },
-
+                new CoreInfo
-            coreInfos.Add(new CoreInfo
                 {
                     coreType = ECoreType.sing_box,
                     coreExes = new List<string> { "sing-box-client", "sing-box" },
                     arguments = "run",
                     coreUrl = Global.singboxCoreUrl,
                     redirectInfo = true,
-            });
+                }
+            };
         }
 
     }

v2rayN/v2rayN/Handler/MainFormHandler.cs

@@ -1,14 +1,12 @@
 using NHotkey;
 using NHotkey.WindowsForms;
 using System;
-using System.Collections.Generic;
 using System.Drawing;
 using System.IO;
 using System.Threading;
 using System.Threading.Tasks;
 using System.Windows.Forms;
 using v2rayN.Mode;
-using System.Linq;
 using v2rayN.Resx;
 
 namespace v2rayN.Handler

v2rayN/v2rayN/Handler/ShareHandler.cs

@@ -2,10 +2,7 @@
 using System.Collections.Generic;
 using System.Collections.Specialized;
 using System.Linq;
-using System.Net;
-using System.Text;
 using System.Text.RegularExpressions;
-using System.Threading.Tasks;
 using System.Web;
 using v2rayN.Base;
 using v2rayN.Mode;
@@ -104,7 +101,7 @@ namespace v2rayN.Handler
             //url = Utils.Base64Encode(url);
             //new Sip002
             var pw = Utils.Base64Encode($"{item.security}:{item.id}");
-            url = $"{pw}@{GetIpv6(item.address)}:{ item.port}";
+            url = $"{pw}@{GetIpv6(item.address)}:{item.port}";
             url = $"{Global.ssProtocol}{url}{remark}";
             return url;
         }
@@ -125,7 +122,7 @@ namespace v2rayN.Handler
             //url = Utils.Base64Encode(url);
             //new
             var pw = Utils.Base64Encode($"{item.security}:{item.id}");
-            url = $"{pw}@{GetIpv6(item.address)}:{ item.port}";
+            url = $"{pw}@{GetIpv6(item.address)}:{item.port}";
             url = $"{Global.socksProtocol}{url}{remark}";
             return url;
         }
@@ -142,10 +139,7 @@ namespace v2rayN.Handler
             GetStdTransport(item, null, ref dicQuery);
             string query = "?" + string.Join("&", dicQuery.Select(x => x.Key + "=" + x.Value).ToArray());
 
-            url = string.Format("{0}@{1}:{2}",
+            url = $"{item.id}@{GetIpv6(item.address)}:{item.port}";
-            item.id,
-            GetIpv6(item.address),
-            item.port);
             url = $"{Global.trojanProtocol}{url}{query}{remark}";
             return url;
         }
@@ -158,22 +152,14 @@ namespace v2rayN.Handler
             {
                 remark = "#" + Utils.UrlEncode(item.remarks);
             }
-            var dicQuery = new Dictionary<string, string>();
+            var dicQuery = new Dictionary<string, string>
-            if (!Utils.IsNullOrEmpty(item.security))
             {
-                dicQuery.Add("encryption", item.security);
+                { "encryption", !Utils.IsNullOrEmpty(item.security) ? item.security : "none" }
-            }
+            };
-            else
-            {
-                dicQuery.Add("encryption", "none");
-            }
             GetStdTransport(item, "none", ref dicQuery);
             string query = "?" + string.Join("&", dicQuery.Select(x => x.Key + "=" + x.Value).ToArray());
 
-            url = string.Format("{0}@{1}:{2}",
+            url = $"{item.id}@{GetIpv6(item.address)}:{item.port}";
-            item.id,
-            GetIpv6(item.address),
-            item.port);
             url = $"{Global.vlessProtocol}{url}{query}{remark}";
             return url;
         }
@@ -204,7 +190,7 @@ namespace v2rayN.Handler
             {
                 dicQuery.Add("sni", item.sni);
             }
-            if (item.alpn != null && item.alpn.Count > 0)
+            if (item.alpn is { Count: > 0 })
             {
                 dicQuery.Add("alpn", Utils.UrlEncode(Utils.List2String(item.alpn)));
             }
@@ -261,7 +247,7 @@ namespace v2rayN.Handler
                     if (!Utils.IsNullOrEmpty(item.path))
                     {
                         dicQuery.Add("serviceName", Utils.UrlEncode(item.path));
-                        if (item.headerType == Global.GrpcgunMode || item.headerType == Global.GrpcmultiMode)
+                        if (item.headerType is Global.GrpcgunMode or Global.GrpcmultiMode)
                         {
                             dicQuery.Add("mode", Utils.UrlEncode(item.headerType));
                         }

v2rayN/v2rayN/Handler/SpeedtestHandler.cs

@@ -13,10 +13,10 @@ namespace v2rayN.Handler
 {
     class SpeedtestHandler
     {
-        private Config _config;
+        private readonly Config _config;
-        private V2rayHandler _v2rayHandler;
+        private readonly V2rayHandler _v2rayHandler;
-        private List<ServerTestItem> _selecteds;
+        private readonly List<ServerTestItem> _selecteds;
-        Action<string, string> _updateFunc;
+        private readonly Action<string, string> _updateFunc;
 
         public SpeedtestHandler(Config config)
         {
@@ -137,8 +137,7 @@ namespace v2rayN.Handler
                         try
                         {
                             WebProxy webProxy = new WebProxy(Global.Loopback, it.port);
-                            int responseTime = -1;
+                            string status = downloadHandle.GetRealPingTime(_config.constItem.speedPingTestUrl, webProxy, out var responseTime);
-                            string status = downloadHandle.GetRealPingTime(_config.constItem.speedPingTestUrl, webProxy, out responseTime);
                             string output = Utils.IsNullOrEmpty(status) ? FormatOut(responseTime, "ms") : status;
 
                             _config.GetVmessItem(it.indexId)?.SetTestResult(output);

v2rayN/v2rayN/Handler/StatisticsHandler.cs

@@ -1,6 +1,7 @@
 using Grpc.Core;
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using System.Net;
 using System.Net.Sockets;
 using System.Threading;
@@ -149,26 +150,17 @@ namespace v2rayN.Handler
                     serverStatistics_ = Utils.FromJson<ServerStatistics>(result);
                 }
 
-                if (serverStatistics_ == null)
+                serverStatistics_ ??= new ServerStatistics();
-                {
+                serverStatistics_.server ??= new List<ServerStatItem>();
-                    serverStatistics_ = new ServerStatistics();
-                }
-                if (serverStatistics_.server == null)
-                {
-                    serverStatistics_.server = new List<ServerStatItem>();
-                }
 
                 long ticks = DateTime.Now.Date.Ticks;
-                foreach (ServerStatItem item in serverStatistics_.server)
+                foreach (var item in serverStatistics_.server.Where(item => item.dateNow != ticks))
-                {
-                    if (item.dateNow != ticks)
                 {
                     item.todayUp = 0;
                     item.todayDown = 0;
                     item.dateNow = ticks;
                 }
             }
-            }
             catch (Exception ex)
             {
                 Utils.SaveLog(ex.Message, ex);

v2rayN/v2rayN/Handler/SysProxyHandle.cs

@@ -144,11 +144,9 @@ namespace v2rayN.Handler
             // using event to avoid hanging when redirect standard output/error
             // ref: https://stackoverflow.com/questions/139593/processstartinfo-hanging-on-waitforexit-why
             // and http://blog.csdn.net/zhangweixing0/article/details/7356841
-            using (AutoResetEvent outputWaitHandle = new AutoResetEvent(false))
+            using AutoResetEvent outputWaitHandle = new AutoResetEvent(false);
-            using (AutoResetEvent errorWaitHandle = new AutoResetEvent(false))
+            using AutoResetEvent errorWaitHandle = new AutoResetEvent(false);
-            {
+            using Process process = new Process();
-                using (Process process = new Process())
-                {
             // Configure the process using the StartInfo properties.
             process.StartInfo.FileName = Utils.GetTempPath("sysproxy.exe");
             process.StartInfo.Arguments = arguments;
@@ -222,8 +220,6 @@ namespace v2rayN.Handler
             //    _queryStr = stdout;
             //}
         }
-            }
-        }
 
 
     }

v2rayN/v2rayN/Handler/UpdateHandle.cs

@@ -8,7 +8,6 @@ using System.Text.RegularExpressions;
 using System.Threading;
 using System.Threading.Tasks;
 using System.Windows.Forms;
-using Newtonsoft.Json;
 using v2rayN.Base;
 using v2rayN.Mode;
 using v2rayN.Resx;
@@ -405,15 +404,7 @@ namespace v2rayN.Handler
             try
             {
                 var gitHubReleases = Utils.FromJson<List<GitHubRelease>>(gitHubReleaseApi);
-                string version;
+                var version = preRelease ? gitHubReleases!.First().TagName : gitHubReleases!.First(r => r.Prerelease == false).TagName;
-                if (preRelease)
-                {
-                    version = gitHubReleases!.First().TagName;
-                }
-                else
-                {
-                    version = gitHubReleases!.First(r => r.Prerelease == false).TagName;
-                }
                 var coreInfo = LazyConfig.Instance.GetCoreInfo(type);
 
                 string curVersion;
@@ -437,14 +428,9 @@ namespace v2rayN.Handler
                         {
                             curVersion = getCoreVersion(type);
                             message = string.Format(ResUI.IsLatestCore, curVersion);
-                            if (Environment.Is64BitProcess)
+                            url = string.Format(Environment.Is64BitProcess 
-                            {
+                                ? coreInfo.coreDownloadUrl64 
-                                url = string.Format(coreInfo.coreDownloadUrl64, version);
+                                : coreInfo.coreDownloadUrl32, version);
-                            }
-                            else
-                            {
-                                url = string.Format(coreInfo.coreDownloadUrl32, version);
-                            }
                             break;
                         }
                     case ECoreType.v2rayN:

v2rayN/v2rayN/Handler/V2rayConfigHandler.cs

@@ -246,21 +246,21 @@ namespace v2rayN.Handler
                 {
                     rules.port = null;
                 }
-                if (rules.domain != null && rules.domain.Count == 0)
+                if (rules.domain is { Count: 0 })
                 {
                     rules.domain = null;
                 }
-                if (rules.ip != null && rules.ip.Count == 0)
+                if (rules.ip is { Count: 0 })
                 {
                     rules.ip = null;
                 }
-                if (rules.protocol != null && rules.protocol.Count == 0)
+                if (rules.protocol is { Count: 0 })
                 {
                     rules.protocol = null;
                 }
 
                 var hasDomainIp = false;
-                if (rules.domain != null && rules.domain.Count > 0)
+                if (rules.domain is { Count: > 0 })
                 {
                     var it = Utils.DeepCopy(rules);
                     it.ip = null;
@@ -284,7 +284,7 @@ namespace v2rayN.Handler
                     v2rayConfig.routing.rules.Add(it);
                     hasDomainIp = true;
                 }
-                if (rules.ip != null && rules.ip.Count > 0)
+                if (rules.ip is { Count: > 0 })
                 {
                     var it = Utils.DeepCopy(rules);
                     it.domain = null;
@@ -314,7 +314,7 @@ namespace v2rayN.Handler
                         it.type = "field";
                         v2rayConfig.routing.rules.Add(it);
                     }
-                    else if (rules.protocol != null && rules.protocol.Count > 0)
+                    else if (rules.protocol is { Count: > 0 })
                     {
                         var it = Utils.DeepCopy(rules);
                         //it.domain = null;
@@ -377,14 +377,7 @@ namespace v2rayN.Handler
                     usersItem.id = node.id;
                     usersItem.alterId = node.alterId;
                     usersItem.email = Global.userEMail;
-                    if (Global.vmessSecuritys.Contains(node.security))
+                    usersItem.security = Global.vmessSecuritys.Contains(node.security) ? node.security : Global.DefaultSecurity;
-                    {
-                        usersItem.security = node.security;
-                    }
-                    else
-                    {
-                        usersItem.security = Global.DefaultSecurity;
-                    }
 
                     //Mux
                     outbound.mux.enabled = config.muxEnabled;
@@ -503,14 +496,7 @@ namespace v2rayN.Handler
                     //if xtls
                     if (node.streamSecurity == Global.StreamSecurityX)
                     {
-                        if (Utils.IsNullOrEmpty(node.flow))
+                        usersItem.flow = Utils.IsNullOrEmpty(node.flow) ? Global.xtlsFlows[1] : node.flow.Replace("splice", "direct");
-                        {
-                            usersItem.flow = Global.xtlsFlows[1];
-                        }
-                        else
-                        {
-                            usersItem.flow = node.flow.Replace("splice", "direct");
-                        }
 
                         outbound.mux.enabled = false;
                         outbound.mux.concurrency = -1;
@@ -553,14 +539,9 @@ namespace v2rayN.Handler
                     //if xtls
                     if (node.streamSecurity == Global.StreamSecurityX)
                     {
-                        if (Utils.IsNullOrEmpty(node.flow))
+                        serversItem.flow = Utils.IsNullOrEmpty(node.flow)
-                        {
+                            ? Global.xtlsFlows[1]
-                            serversItem.flow = Global.xtlsFlows[1];
+                            : node.flow.Replace("splice", "direct");
-                        }
-                        else
-                        {
-                            serversItem.flow = node.flow.Replace("splice", "direct");
-                        }
 
                         outbound.mux.enabled = false;
                         outbound.mux.concurrency = -1;
@@ -660,7 +641,7 @@ namespace v2rayN.Handler
                         }
                         else if (iobound.Equals("in"))
                         {
-                            kcpSettings.uplinkCapacity = config.kcpItem.downlinkCapacity; ;
+                            kcpSettings.uplinkCapacity = config.kcpItem.downlinkCapacity;
                             kcpSettings.downlinkCapacity = config.kcpItem.downlinkCapacity;
                         }
                         else
@@ -1423,10 +1404,6 @@ namespace v2rayN.Handler
                         if (!Utils.IsNullOrEmpty(request))
                         {
                             V2rayTcpRequest v2rayTcpRequest = Utils.FromJson<V2rayTcpRequest>(request);
-                            if (v2rayTcpRequest != null
-                                && v2rayTcpRequest.headers != null
-                                && v2rayTcpRequest.headers.Host != null
-                                && v2rayTcpRequest.headers.Host.Count > 0)
                             {
                                 vmessItem.requestHost = v2rayTcpRequest.headers.Host[0];
                             }
@@ -1465,17 +1442,14 @@ namespace v2rayN.Handler
                     {
                         vmessItem.path = inbound.streamSettings.httpSettings.path;
                     }
-                    if (inbound.streamSettings.httpSettings.host != null
+                    if (inbound.streamSettings.httpSettings.host is { Count: > 0 })
-                        && inbound.streamSettings.httpSettings.host.Count > 0)
                     {
                         vmessItem.requestHost = Utils.List2String(inbound.streamSettings.httpSettings.host);
                     }
                 }
 
                 //tls
-                if (inbound.streamSettings != null
+                if (inbound.streamSettings is { security: Global.StreamSecurity })
-                    && inbound.streamSettings.security != null
-                    && inbound.streamSettings.security == Global.StreamSecurity)
                 {
                     vmessItem.streamSecurity = Global.StreamSecurity;
                 }

v2rayN/v2rayN/Handler/V2rayHandler.cs

@@ -63,7 +63,7 @@ namespace v2rayN.Handler
                 }
 
                 //start a socks service
-                if (_process != null && !_process.HasExited && item.configType == EConfigType.Custom && item.preSocksPort > 0)
+                if (_process is { HasExited: false } && item.configType == EConfigType.Custom && item.preSocksPort > 0)
                 {
                     var itemSocks = new VmessItem()
                     {

v2rayN/v2rayN/Mode/Config.cs

@@ -275,11 +275,9 @@ namespace v2rayN.Mode
 
         public string GetGroupRemarks(string groupId)
         {
-            if (string.IsNullOrEmpty(groupId))
+            return string.IsNullOrEmpty(groupId) 
-            {
+                ? string.Empty 
-                return string.Empty;
+                : groupItem.FirstOrDefault(it => it.id == groupId)?.remarks;
-            }
-            return groupItem.Where(it => it.id == groupId).FirstOrDefault()?.remarks;
         }
 
         #endregion
@@ -316,21 +314,14 @@ namespace v2rayN.Mode
         #region function
         public string GetSummary()
         {
-            string summary = string.Format("[{0}] ", (configType).ToString());
+            string summary = $"[{(configType).ToString()}] ";
             string[] arrAddr = address.Split('.');
-            string addr;
+            string addr = arrAddr.Length switch
-            if (arrAddr.Length > 2)
             {
-                addr = $"{arrAddr[0]}***{arrAddr[arrAddr.Length - 1]}";
+                > 2 => $"{arrAddr[0]}***{arrAddr[arrAddr.Length - 1]}",
-            }
+                > 1 => $"***{arrAddr[arrAddr.Length - 1]}",
-            else if (arrAddr.Length > 1)
+                _ => address
-            {
+            };
-                addr = $"***{arrAddr[arrAddr.Length - 1]}";
-            }
-            else
-            {
-                addr = address;
-            }
             switch (configType)
             {
                 case EConfigType.VMess:
@@ -338,10 +329,10 @@ namespace v2rayN.Mode
                 case EConfigType.Socks:
                 case EConfigType.VLESS:
                 case EConfigType.Trojan:
-                    summary += string.Format("{0}({1}:{2})", remarks, addr, port);
+                    summary += $"{remarks}({addr}:{port})";
                     break;
                 default:
-                    summary += string.Format("{0}", remarks);
+                    summary += $"{remarks}";
                     break;
             }
             return summary;
@@ -372,23 +363,12 @@ namespace v2rayN.Mode
                 return subRemarks;
             }
             var group = config.groupItem.FirstOrDefault(t => t.id == groupId);
-            if (group != null)
+            return group != null ? group.remarks : groupId.Substring(0, 4);
-            {
-                return group.remarks;
-            }
-            return groupId.Substring(0, 4);
         }
 
         public List<string> GetAlpn()
         {
-            if (alpn != null && alpn.Count > 0)
+            return alpn is { Count: > 0 } ? alpn : null;
-            {
-                return alpn;
-            }
-            else
-            {
-                return null;
-            }
         }
         public string GetNetwork()
         {

v2rayN/v2rayN/Mode/RoutingItem.cs

@@ -1,8 +1,5 @@
 using System;
 using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace v2rayN.Mode
 {

v2rayN/v2rayN/Tool/FileManager.cs

@@ -11,7 +11,7 @@ namespace v2rayN.Tool
         {
             try
             {
-                using (FileStream fs = new FileStream(fileName, FileMode.Create, FileAccess.Write))
+                using FileStream fs = new FileStream(fileName, FileMode.Create, FileAccess.Write);
                 fs.Write(content, 0, content.Length);
                 return true;
             }
@@ -31,16 +31,14 @@ namespace v2rayN.Tool
                 byte[] buffer = new byte[4096];
                 int n;
 
-                using (FileStream fs = File.Create(fileName))
+                using FileStream fs = File.Create(fileName);
-                using (GZipStream input = new GZipStream(new MemoryStream(content),
+                using GZipStream input = new GZipStream(new MemoryStream(content),
-                        CompressionMode.Decompress, false))
+                    CompressionMode.Decompress, false);
-                {
                 while ((n = input.Read(buffer, 0, buffer.Length)) > 0)
                 {
                     fs.Write(buffer, 0, n);
                 }
             }
-            }
             catch (Exception ex)
             {
                 Utils.SaveLog(ex.Message, ex);
@@ -56,12 +54,10 @@ namespace v2rayN.Tool
         {
             try
             {
-                using (FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
+                using FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
-                using (StreamReader sr = new StreamReader(fs, encoding))
+                using StreamReader sr = new StreamReader(fs, encoding);
-                {
                 return sr.ReadToEnd();
             }
-            }
             catch (Exception ex)
             {
                 Utils.SaveLog(ex.Message, ex);
@@ -111,8 +107,7 @@ namespace v2rayN.Tool
         {
             try
             {
-                using (ZipArchive archive = ZipFile.OpenRead(fileName))
+                using ZipArchive archive = ZipFile.OpenRead(fileName);
-                {
                 foreach (ZipArchiveEntry entry in archive.Entries)
                 {
                     if (entry.Length == 0)
@@ -124,7 +119,6 @@ namespace v2rayN.Tool
                     entry.ExtractToFile(entryOuputPath, true);
                 }
             }
-            }
             catch (Exception ex)
             {
                 Utils.SaveLog(ex.Message, ex);

v2rayN/v2rayN/Tool/Job.cs

@@ -35,8 +35,7 @@ namespace v2rayN
 
                 if (!SetInformationJobObject(handle, JobObjectInfoType.ExtendedLimitInformation, extendedInfoPtr,
                         (uint) length))
-                    throw new Exception(string.Format("Unable to set information.  Error: {0}",
+                    throw new Exception($"Unable to set information.  Error: {Marshal.GetLastWin32Error()}");
-                        Marshal.GetLastWin32Error()));
             }
             finally
             {

v2rayN/v2rayN/Tool/QueryableExtension.cs

@@ -9,14 +9,14 @@ namespace v2rayN.Tool
     {
         public static IOrderedQueryable<T> OrderBy<T>(this IQueryable<T> query, string propertyName)
         {
-            return _OrderBy<T>(query, propertyName, false);
+            return _OrderBy(query, propertyName, false);
         }
         public static IOrderedQueryable<T> OrderByDescending<T>(this IQueryable<T> query, string propertyName)
         {
-            return _OrderBy<T>(query, propertyName, true);
+            return _OrderBy(query, propertyName, true);
         }
 
-        static IOrderedQueryable<T> _OrderBy<T>(IQueryable<T> query, string propertyName, bool isDesc)
+        private static IOrderedQueryable<T> _OrderBy<T>(IQueryable<T> query, string propertyName, bool isDesc)
         {
             string methodname = (isDesc) ? "OrderByDescendingInternal" : "OrderByInternal";
 
@@ -35,7 +35,8 @@ namespace v2rayN.Tool
         {//public
             return query.OrderByDescending(_GetLamba<T, TProp>(memberProperty));
         }
-        static Expression<Func<T, TProp>> _GetLamba<T, TProp>(PropertyInfo memberProperty)
+
+        private static Expression<Func<T, TProp>> _GetLamba<T, TProp>(PropertyInfo memberProperty)
         {
             if (memberProperty.PropertyType != typeof(TProp)) throw new Exception();
 

v2rayN/v2rayN/Tool/Utils.cs

@@ -45,12 +45,10 @@ namespace v2rayN
             try
             {
                 Assembly assembly = Assembly.GetExecutingAssembly();
-                using (Stream stream = assembly.GetManifestResourceStream(res))
+                using Stream stream = assembly.GetManifestResourceStream(res);
-                using (StreamReader reader = new StreamReader(stream))
+                using StreamReader reader = new StreamReader(stream);
-                {
                 result = reader.ReadToEnd();
             }
-            }
             catch (Exception ex)
             {
                 SaveLog(ex.Message, ex);
@@ -69,11 +67,9 @@ namespace v2rayN
 
             try
             {
-                using (StreamReader reader = new StreamReader(res))
+                using StreamReader reader = new StreamReader(res);
-                {
                 result = reader.ReadToEnd();
             }
-            }
             catch (Exception ex)
             {
                 SaveLog(ex.Message, ex);
@@ -385,7 +381,7 @@ namespace v2rayN
         public static string HumanFy(ulong amount)
         {
             ToHumanReadable(amount, out double result, out string unit);
-            return $"{string.Format("{0:f1}", result)} {unit}";
+            return $"{$"{result:f1}"} {unit}";
         }
 
 
@@ -545,18 +541,10 @@ namespace v2rayN
 
         #region 开机自动启动
 
-        private static string autoRunName
+        private static string autoRunName => $"v2rayNAutoRun_{GetMD5(StartupPath())}";
-        {
+
-            get
+        private static string autoRunRegPath => @"Software\Microsoft\Windows\CurrentVersion\Run";
-            {
+
-                return $"v2rayNAutoRun_{GetMD5(StartupPath())}";
-            }
-        }
-        private static string autoRunRegPath
-        {
-            get
-            {
-                return @"Software\Microsoft\Windows\CurrentVersion\Run";
         //if (Environment.Is64BitProcess)
         //{
         //    return @"Software\Microsoft\Windows\CurrentVersion\Run";
@@ -565,9 +553,6 @@ namespace v2rayN
         //{
         //    return @"SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run";
         //}
-            }
-        }
-
         /// <summary>
         /// 开机自动启动
         /// </summary>
@@ -703,23 +688,16 @@ namespace v2rayN
         public static bool CheckForDotNetVersion(int release = 528040)
         {
             const string subkey = @"SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full\";
-            using (RegistryKey ndpKey = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry32).OpenSubKey(subkey))
+            using RegistryKey ndpKey = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry32).OpenSubKey(subkey);
-            {
             if (ndpKey != null && ndpKey.GetValue("Release") != null)
             {
                 return (int)ndpKey.GetValue("Release") >= release ? true : false;
             }
             return false;
         }
-        }
 
-        public static string MainMsgFilterKey
+        public static string MainMsgFilterKey => $"MainMsgFilter_{GetMD5(StartupPath())}";
-        {
+
-            get
-            {
-                return $"MainMsgFilter_{GetMD5(StartupPath())}";
-            }
-        }
         #endregion
 
         #region 测速
@@ -837,14 +815,12 @@ namespace v2rayN
                 string location = GetExePath();
                 if (blFull)
                 {
-                    return string.Format("v2rayN - V{0} - {1}",
+                    return
-                            FileVersionInfo.GetVersionInfo(location).FileVersion.ToString(),
+                        $"v2rayN - V{FileVersionInfo.GetVersionInfo(location).FileVersion.ToString()} - {File.GetLastWriteTime(location).ToString("yyyy/MM/dd")}";
-                            File.GetLastWriteTime(location).ToString("yyyy/MM/dd"));
                 }
                 else
                 {
-                    return string.Format("v2rayN/{0}",
+                    return $"v2rayN/{FileVersionInfo.GetVersionInfo(location).FileVersion.ToString()}";
-                        FileVersionInfo.GetVersionInfo(location).FileVersion.ToString());
                 }
             }
             catch (Exception ex)
@@ -1076,9 +1052,8 @@ namespace v2rayN
             {
                 foreach (Screen screen in Screen.AllScreens)
                 {
-                    using (Bitmap fullImage = new Bitmap(screen.Bounds.Width,
+                    using Bitmap fullImage = new Bitmap(screen.Bounds.Width,
-                                                    screen.Bounds.Height))
+                        screen.Bounds.Height);
-                    {
                     using (Graphics g = Graphics.FromImage(fullImage))
                     {
                         g.CopyFromScreen(screen.Bounds.X,
@@ -1115,7 +1090,6 @@ namespace v2rayN
                     }
                 }
             }
-            }
             catch (Exception ex)
             {
                 SaveLog(ex.Message, ex);
@@ -1128,13 +1102,7 @@ namespace v2rayN
 
         #region Windows API
 
-        public static string WindowHwndKey
+        public static string WindowHwndKey => $"WindowHwnd_{GetMD5(StartupPath())}";
-        {
-            get
-            {
-                return $"WindowHwnd_{GetMD5(StartupPath())}";
-            }
-        }
 
         [DllImport("user32.dll")]
         public static extern bool SetProcessDPIAware();