update

v2rayN/v2rayN/Base/StringEx.cs

@@ -42,7 +42,7 @@ namespace v2rayN.Base
             }
         }
 
-        public static string TrimEx(this string value)
+        public static string TrimEx(this string? value)
         {
             return value == null ? string.Empty : value.Trim();
         }

v2rayN/v2rayN/Views/AddServerWindow.xaml.cs

@@ -185,12 +185,12 @@ namespace v2rayN.Views
                 return;
             }
 
-            if (network.Equals(Global.DefaultNetwork))
+            if (network == Global.DefaultNetwork)
             {
                 cmbHeaderType.Items.Add(Global.None);
                 cmbHeaderType.Items.Add(Global.TcpHeaderHttp);
             }
-            else if (network.Equals("kcp") || network.Equals("quic"))
+            else if (network is "kcp" or "quic")
             {
                 cmbHeaderType.Items.Add(Global.None);
                 Global.kcpHeaderTypes.ForEach(it =>
@@ -198,7 +198,7 @@ namespace v2rayN.Views
                     cmbHeaderType.Items.Add(it);
                 });
             }
-            else if (network.Equals("grpc"))
+            else if (network == "grpc")
             {
                 cmbHeaderType.Items.Add(Global.GrpcgunMode);
                 cmbHeaderType.Items.Add(Global.GrpcmultiMode);
@@ -222,37 +222,34 @@ namespace v2rayN.Views
             tipPath.Text =
             tipHeaderType.Text = string.Empty;
 
-            if (network.Equals(Global.DefaultNetwork))
+            switch (network)
             {
+                case Global.DefaultNetwork:
                     tipRequestHost.Text = ResUI.TransportRequestHostTip1;
                     tipHeaderType.Text = ResUI.TransportHeaderTypeTip1;
-            }
-            else if (network.Equals("kcp"))
-            {
+                    break;
+                case "kcp":
                     tipHeaderType.Text = ResUI.TransportHeaderTypeTip2;
                     tipPath.Text = ResUI.TransportPathTip5;
-            }
-            else if (network.Equals("ws"))
-            {
+                    break;
+                case "ws":
                     tipRequestHost.Text = ResUI.TransportRequestHostTip2;
                     tipPath.Text = ResUI.TransportPathTip1;
-            }
-            else if (network.Equals("h2"))
-            {
+                    break;
+                case "h2":
                     tipRequestHost.Text = ResUI.TransportRequestHostTip3;
                     tipPath.Text = ResUI.TransportPathTip2;
-            }
-            else if (network.Equals("quic"))
-            {
+                    break;
+                case "quic":
                     tipRequestHost.Text = ResUI.TransportRequestHostTip4;
                     tipPath.Text = ResUI.TransportPathTip3;
                     tipHeaderType.Text = ResUI.TransportHeaderTypeTip3;
-            }
-            else if (network.Equals("grpc"))
-            {
+                    break;
+                case "grpc":
                     tipPath.Text = ResUI.TransportPathTip4;
                     tipHeaderType.Text = ResUI.TransportHeaderTypeTip4;
                     labHeaderType.Visibility = Visibility.Hidden;
+                    break;
             }
         }
 

v2rayN/v2rayN/Views/GlobalHotkeySettingWindow.xaml.cs

@@ -85,19 +85,19 @@ namespace v2rayN.Views
 
                 if (item.Control)
                 {
-                    keys += $"{Forms.Keys.Control.ToString()} + ";
+                    keys += $"{Forms.Keys.Control} + ";
                 }
                 if (item.Alt)
                 {
-                    keys += $"{Forms.Keys.Alt.ToString()} + ";
+                    keys += $"{Forms.Keys.Alt} + ";
                 }
                 if (item.Shift)
                 {
-                    keys += $"{Forms.Keys.Shift.ToString()} + ";
+                    keys += $"{Forms.Keys.Shift} + ";
                 }
                 if (item.KeyCode != null)
                 {
-                    keys += $"{item.KeyCode.ToString()}";
+                    keys += $"{item.KeyCode}";
                 }
 
                 SetText($"txtGlobalHotkey{k}", keys);
@@ -148,11 +148,11 @@ namespace v2rayN.Views
         {
             foreach (UIElement element in gridText.Children)
             {
-                if (element is TextBox)
+                if (element is TextBox box)
                 {
-                    if (((TextBox)element).Name == name)
+                    if (box.Name == name)
                     {
-                        ((TextBox)element).Text = txt;
+                        box.Text = txt;
                     }
                 }
             }

v2rayN/v2rayN/Views/MainWindow.xaml

@@ -359,6 +359,7 @@
                         Margin="4,0"
                         materialDesign:HintAssist.Hint="{x:Static resx:ResUI.MsgServerTitle}"
                         materialDesign:TextFieldAssist.HasClearButton="True"
+                        VerticalContentAlignment="Center"
                         Style="{StaticResource DefTextBox}" />
                 </WrapPanel>
 

v2rayN/v2rayN/Views/MainWindow.xaml.cs

@@ -197,13 +197,13 @@ namespace v2rayN.Views
         {
             if (action == "AdjustMainLvColWidth")
             {
-                Application.Current.Dispatcher.Invoke((Action)(() =>
+                Application.Current.Dispatcher.Invoke(() =>
                 {
                     foreach (var it in lstProfiles.Columns)
                     {
                         it.Width = new DataGridLength(1, DataGridLengthUnitType.Auto);
                     }
-                }));
+                });
             }
             else if (action == "ProfilesFocus")
             {
@@ -355,7 +355,7 @@ namespace v2rayN.Views
             }
             else
             {
-                if (e.Key == Key.Enter || e.Key == Key.Return)
+                if (e.Key is Key.Enter or Key.Return)
                 {
                     ViewModel?.SetDefaultServer();
                 }
@@ -471,9 +471,8 @@ namespace v2rayN.Views
         }
         private void MenuItem_Click(object sender, RoutedEventArgs e)
         {
-            if (sender is MenuItem)
+            if (sender is MenuItem item)
             {
-                MenuItem item = (MenuItem)sender;
                 Utils.ProcessStart(item.Tag.ToString());
             }
         }
@@ -482,7 +481,7 @@ namespace v2rayN.Views
         #endregion
         #region Drag and Drop
 
-        private Point startPoint = new Point();
+        private Point startPoint = new();
         private int startIndex = -1;
         private string formatData = "ProfileItemModel";
 
@@ -523,8 +522,7 @@ namespace v2rayN.Views
                        Math.Abs(diff.Y) > SystemParameters.MinimumVerticalDragDistance))
             {
                 // Get the dragged Item
-                var listView = sender as DataGrid;
-                if (listView == null) return;
+                if (sender is not DataGrid listView) return;
                 var listViewItem = FindAnchestor<DataGridRow>((DependencyObject)e.OriginalSource);
                 if (listViewItem == null) return;           // Abort
                                                             // Find the data behind the ListViewItem
@@ -532,7 +530,7 @@ namespace v2rayN.Views
                 if (item == null) return;                   // Abort
                                                             // Initialize the drag & drop operation
                 startIndex = lstProfiles.SelectedIndex;
-                DataObject dragData = new DataObject(formatData, item);
+                DataObject dragData = new(formatData, item);
                 DragDrop.DoDragDrop(listViewItem, dragData, DragDropEffects.Copy | DragDropEffects.Move);
             }
         }
@@ -550,8 +548,7 @@ namespace v2rayN.Views
             if (e.Data.GetDataPresent(formatData) && sender == e.Source)
             {
                 // Get the drop Item destination
-                var listView = sender as DataGrid;
-                if (listView == null) return;
+                if (sender is not DataGrid listView) return;
                 var listViewItem = FindAnchestor<DataGridRow>((DependencyObject)e.OriginalSource);
                 if (listViewItem == null)
                 {

v2rayN/v2rayN/Views/OptionSettingWindow.xaml.cs

@@ -76,13 +76,12 @@ namespace v2rayN.Views
             //fill fonts
             try
             {
-                var dir = new DirectoryInfo(Utils.GetFontsPath());
-                var files = dir.GetFiles("*.ttf");
+                var files = Directory.GetFiles(Utils.GetFontsPath(), "*.ttf");
                 var culture = _config.uiItem.currentLanguage.Equals(Global.Languages[0]) ? "zh-cn" : "en-us";
                 var culture2 = "en-us";
-                foreach (var it in files)
+                foreach (var ttf in files)
                 {
-                    var families = Fonts.GetFontFamilies(Utils.GetFontsPath(it.Name));
+                    var families = Fonts.GetFontFamilies(Utils.GetFontsPath(ttf));
                     foreach (FontFamily family in families)
                     {
                         var typefaces = family.GetTypefaces();