Fix #1878: Add simple language switch to the UI.

ILSpy/Controls/CultureSelectionConverter.cs

@@ -0,0 +1,41 @@
+// Copyright (c) 2021 Siegfried Pammer
+// 
+// Permission is hereby granted, free of charge, to any person obtaining a copy of this
+// software and associated documentation files (the "Software"), to deal in the Software
+// without restriction, including without limitation the rights to use, copy, modify, merge,
+// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
+// to whom the Software is furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in all copies or
+// substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
+// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE
+
+using System;
+using System.Globalization;
+using System.Windows.Data;
+
+namespace ICSharpCode.ILSpy.Controls
+{
+	public class CultureSelectionConverter : IValueConverter
+	{
+		public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+		{
+			if (value is string s)
+				return s.Equals(parameter);
+			return value == parameter;
+		}
+
+		public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+		{
+			if ((bool)value)
+				return parameter;
+			return Binding.DoNothing;
+		}
+	}
+}

ILSpy/MainWindow.xaml

@@ -7,10 +7,8 @@
 	xmlns:avalondock="https://github.com/Dirkster99/AvalonDock"
 	xmlns:controls="clr-namespace:ICSharpCode.ILSpy.Controls"
 	xmlns:docking="clr-namespace:ICSharpCode.ILSpy.Docking"
-	xmlns:textview="clr-namespace:ICSharpCode.ILSpy.TextView"
 	xmlns:analyzers="clr-namespace:ICSharpCode.ILSpy.Analyzers"
 	xmlns:properties="clr-namespace:ICSharpCode.ILSpy.Properties"
-	xmlns:viewmodels="clr-namespace:ICSharpCode.ILSpy.ViewModels"
 	Title="ILSpy"
 	MinWidth="250"
 	MinHeight="200"
@@ -62,6 +60,8 @@
 
 		<styles:InvertGrayEffect x:Key="InvertGrayEffect" />
 
+		<controls:CultureSelectionConverter x:Key="cultureSelectionConverter" />
+
 	</Window.Resources>
 
 	<Window.CommandBindings>
@@ -102,6 +102,12 @@
 				<MenuItem Header="{x:Static properties:Resources.Show_publiconlyTypesMembers}" IsCheckable="True" IsChecked="{Binding SessionSettings.FilterSettings.ApiVisPublicOnly}" />
 				<MenuItem Header="{x:Static properties:Resources.Show_internalTypesMembers}" IsCheckable="True" IsChecked="{Binding SessionSettings.FilterSettings.ApiVisPublicAndInternal}" />
 				<MenuItem Header="{x:Static properties:Resources.Show_allTypesAndMembers}" IsCheckable="True" IsChecked="{Binding SessionSettings.FilterSettings.ApiVisAll}" />
+				<Separator/>
+				<MenuItem Header="Language">
+					<MenuItem Header="{x:Static properties:Resources.UILanguage_System}" IsCheckable="True" IsChecked="{Binding SessionSettings.CurrentCulture, Converter={StaticResource cultureSelectionConverter}, ConverterParameter={x:Null}}" />
+					<MenuItem Header="English" IsCheckable="True" IsChecked="{Binding SessionSettings.CurrentCulture, Converter={StaticResource cultureSelectionConverter}, ConverterParameter=en-US}" />
+					<MenuItem Header="中文" IsCheckable="True" IsChecked="{Binding SessionSettings.CurrentCulture, Converter={StaticResource cultureSelectionConverter}, ConverterParameter=zh-Hans}" />
+				</MenuItem>
 			</MenuItem>
 			<MenuItem Header="{x:Static properties:Resources._Window}" />
 		</Menu>

ILSpy/MainWindow.xaml.cs

@@ -121,7 +121,10 @@ namespace ICSharpCode.ILSpy
 			};
 
 			AssemblyListManager.CreateDefaultAssemblyLists();
-
+			if (!string.IsNullOrEmpty(sessionSettings.CurrentCulture))
+			{
+				System.Threading.Thread.CurrentThread.CurrentUICulture = new System.Globalization.CultureInfo(sessionSettings.CurrentCulture);
+			}
 			DockWorkspace.Instance.LoadSettings(sessionSettings);
 			InitializeComponent();
 			InitToolPanes();
@@ -137,16 +140,19 @@ namespace ICSharpCode.ILSpy
 
 		private void SessionSettings_PropertyChanged(object sender, PropertyChangedEventArgs e)
 		{
-			if (e.PropertyName == "ActiveAssemblyList")
+			switch (e.PropertyName)
 			{
-				ShowAssemblyList(sessionSettings.ActiveAssemblyList);
-			}
-
-			if (e.PropertyName == nameof(SessionSettings.IsDarkMode))
-			{
-				// update syntax highlighting and force reload (AvalonEdit does not automatically refresh on highlighting change)
-				DecompilerTextView.RegisterHighlighting();
-				DecompileSelectedNodes(DockWorkspace.Instance.ActiveTabPage.GetState() as DecompilerTextViewState);
+				case nameof(SessionSettings.ActiveAssemblyList):
+					ShowAssemblyList(sessionSettings.ActiveAssemblyList);
+					break;
+				case nameof(SessionSettings.IsDarkMode):
+					// update syntax highlighting and force reload (AvalonEdit does not automatically refresh on highlighting change)
+					DecompilerTextView.RegisterHighlighting();
+					DecompileSelectedNodes(DockWorkspace.Instance.ActiveTabPage.GetState() as DecompilerTextViewState);
+					break;
+				case nameof(SessionSettings.CurrentCulture):
+					MessageBox.Show(Properties.Resources.SettingsChangeRestartRequired, "ILSpy");
+					break;
 			}
 		}
 

ILSpy/Options/DisplaySettings.cs

@@ -291,7 +291,7 @@ namespace ICSharpCode.ILSpy.Options
 			this.IndentationSize = s.indentationSize;
 			this.HighlightMatchingBraces = s.highlightMatchingBraces;
 			this.HighlightCurrentLine = s.highlightCurrentLine;
-			this.HideEmptyMetadataTables = s.HideEmptyMetadataTables;
+			this.HideEmptyMetadataTables = s.hideEmptyMetadataTables;
 		}
 	}
 }

ILSpy/Properties/Resources.Designer.cs

@@ -2219,6 +2219,15 @@ namespace ICSharpCode.ILSpy.Properties {
             }
         }
         
+        /// <summary>
+        ///   Looks up a localized string similar to You must restart ILSpy for the change to take effect..
+        /// </summary>
+        public static string SettingsChangeRestartRequired {
+            get {
+                return ResourceManager.GetString("SettingsChangeRestartRequired", resourceCulture);
+            }
+        }
+        
         /// <summary>
         ///   Looks up a localized string similar to Shell.
         /// </summary>
@@ -2462,6 +2471,15 @@ namespace ICSharpCode.ILSpy.Properties {
             }
         }
         
+        /// <summary>
+        ///   Looks up a localized string similar to System.
+        /// </summary>
+        public static string UILanguage_System {
+            get {
+                return ResourceManager.GetString("UILanguage_System", resourceCulture);
+            }
+        }
+        
         /// <summary>
         ///   Looks up a localized string similar to No update for ILSpy found..
         /// </summary>

ILSpy/Properties/Resources.resx

@@ -768,6 +768,9 @@ Do you want to continue?</value>
   <data name="SelectVersionDropdownTooltip" xml:space="preserve">
     <value>Select version of language to output</value>
   </data>
+  <data name="SettingsChangeRestartRequired" xml:space="preserve">
+    <value>You must restart ILSpy for the change to take effect.</value>
+  </data>
   <data name="Shell" xml:space="preserve">
     <value>Shell</value>
   </data>
@@ -849,6 +852,9 @@ Do you want to continue?</value>
   <data name="Type" xml:space="preserve">
     <value>Type</value>
   </data>
+  <data name="UILanguage_System" xml:space="preserve">
+    <value>System</value>
+  </data>
   <data name="UpdateILSpyFound" xml:space="preserve">
     <value>No update for ILSpy found.</value>
   </data>

ILSpy/SessionSettings.cs

@@ -62,6 +62,8 @@ namespace ICSharpCode.ILSpy
 			this.BottomPaneSplitterPosition = FromString((string)doc.Element("BottomPaneSplitterPosition"), 0.3);
 			this.SelectedSearchMode = FromString((string)doc.Element("SelectedSearchMode"), SearchMode.TypeAndMember);
 			this.IsDarkMode = FromString((string)doc.Element(nameof(IsDarkMode)), false);
+			string currentCulture = (string)doc.Element(nameof(CurrentCulture));
+			this.CurrentCulture = string.IsNullOrEmpty(currentCulture) ? null : currentCulture;
 
 			this.DockLayout = new DockLayoutSettings(doc.Element("DockLayout"));
 		}
@@ -87,6 +89,19 @@ namespace ICSharpCode.ILSpy
 		public string[] ActiveTreeViewPath;
 		public string ActiveAutoLoadedAssembly;
 
+		string currentCulture;
+
+		public string CurrentCulture {
+			get { return currentCulture; }
+			set {
+				if (currentCulture != value)
+				{
+					currentCulture = value;
+					OnPropertyChanged();
+				}
+			}
+		}
+
 		public string ActiveAssemblyList {
 			get => activeAssemblyList;
 			set {
@@ -132,6 +147,10 @@ namespace ICSharpCode.ILSpy
 			doc.Add(new XElement("BottomPaneSplitterPosition", ToString(this.BottomPaneSplitterPosition)));
 			doc.Add(new XElement("SelectedSearchMode", ToString(this.SelectedSearchMode)));
 			doc.Add(new XElement(nameof(IsDarkMode), ToString(this.IsDarkMode)));
+			if (this.CurrentCulture != null)
+			{
+				doc.Add(new XElement(nameof(CurrentCulture), this.CurrentCulture));
+			}
 
 			var dockLayoutElement = new XElement("DockLayout");
 			if (DockLayout.Valid)