Fix #1952: Add a button to the Misc settings page that adds an "Open with ILSpy" entry to the Windows Explorer context menu on exe and dll files.

ILSpy/Options/MiscSettings.cs

@@ -16,19 +16,26 @@
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 // DEALINGS IN THE SOFTWARE.
 
+using System;
 using System.ComponentModel;
+using System.Reflection;
 using System.Runtime.CompilerServices;
+using System.Security.Principal;
+using System.Windows;
+using System.Windows.Input;
+using ICSharpCode.ILSpy.Commands;
+using Microsoft.Win32;
 
 namespace ICSharpCode.ILSpy.Options
 {
 	public class MiscSettings : INotifyPropertyChanged
 	{
 		bool allowMultipleInstances;
-		bool loadPreviousAssemblies;
+		bool loadPreviousAssemblies = true;
 
 		public MiscSettings()
 		{
-			this.loadPreviousAssemblies = true;
+			AddRemoveShellIntegrationCommand = new DelegateCommand<object>(AddRemoveShellIntegration);
 		}
 
 		/// <summary>
@@ -58,6 +65,52 @@ namespace ICSharpCode.ILSpy.Options
 			}
 		}
 
+		public ICommand AddRemoveShellIntegrationCommand { get; }
+
+		private void AddRemoveShellIntegration(object obj)
+		{
+			if (!IsElevated()) {
+				MessageBox.Show(Properties.Resources.RestartElevatedMessage, "ILSpy", MessageBoxButton.OK, MessageBoxImage.Error);
+				return;
+			}
+			string commandLine = NativeMethods.ArgumentArrayToCommandLine(Assembly.GetEntryAssembly().Location, "%L");
+			if (RegistryEntriesExist()) {
+				if (MessageBox.Show(string.Format(Properties.Resources.RemoveShellIntegrationMessage, commandLine), "ILSpy", MessageBoxButton.YesNo, MessageBoxImage.Question) == MessageBoxResult.Yes) {
+					Registry.ClassesRoot.CreateSubKey(@"dllfile\shell").DeleteSubKeyTree("Open with ILSpy");
+					Registry.ClassesRoot.CreateSubKey(@"exefile\shell").DeleteSubKeyTree("Open with ILSpy");
+				}
+			} else {
+				if (MessageBox.Show(string.Format(Properties.Resources.AddShellIntegrationMessage, commandLine), "ILSpy", MessageBoxButton.YesNo, MessageBoxImage.Question) == MessageBoxResult.Yes) {
+					Registry.ClassesRoot.CreateSubKey(@"dllfile\shell\Open with ILSpy\command")?
+						.SetValue("", commandLine);
+					Registry.ClassesRoot.CreateSubKey(@"exefile\shell\Open with ILSpy\command")?
+						.SetValue("", commandLine);
+				}
+			}
+			OnPropertyChanged(nameof(AddRemoveShellIntegrationText));
+
+			bool IsElevated()
+			{
+				try {
+					return new WindowsPrincipal(WindowsIdentity.GetCurrent()).IsInRole(WindowsBuiltInRole.Administrator);
+				} catch (System.Security.SecurityException) {
+					return false;
+				}
+			}
+		}
+
+		private static bool RegistryEntriesExist()
+		{
+			return Registry.ClassesRoot.OpenSubKey(@"dllfile\shell\Open with ILSpy\command") != null
+				&& Registry.ClassesRoot.OpenSubKey(@"exefile\shell\Open with ILSpy\command") != null;
+		}
+
+		public string AddRemoveShellIntegrationText {
+			get {
+				return RegistryEntriesExist() ? Properties.Resources.RemoveShellIntegration : Properties.Resources.AddShellIntegration;
+			}
+		}
+
 		#region INotifyPropertyChanged Implementation
 
 		public event PropertyChangedEventHandler PropertyChanged;

ILSpy/Options/MiscSettingsPanel.xaml

@@ -7,7 +7,8 @@
 			 mc:Ignorable="d" 
              d:DesignHeight="300" d:DesignWidth="300">
 	<StackPanel Margin="10">
-		<CheckBox IsChecked="{Binding AllowMultipleInstances}" Content="{x:Static properties:Resources.AllowMultipleInstances}"></CheckBox>
+		<CheckBox IsChecked="{Binding AllowMultipleInstances}" Content="{x:Static properties:Resources.AllowMultipleInstances}" />
-		<CheckBox IsChecked="{Binding LoadPreviousAssemblies}" Content="{x:Static properties:Resources.LoadAssembliesThatWereLoadedInTheLastInstance}"></CheckBox>
+		<CheckBox IsChecked="{Binding LoadPreviousAssemblies}" Content="{x:Static properties:Resources.LoadAssembliesThatWereLoadedInTheLastInstance}"/>
+		<Button Command="{Binding AddRemoveShellIntegrationCommand}" Content="{Binding AddRemoveShellIntegrationText}" Margin="3" />
 	</StackPanel>
 </UserControl>

ILSpy/Properties/Resources.Designer.cs

@@ -285,6 +285,26 @@ namespace ICSharpCode.ILSpy.Properties {
             }
         }
         
+        /// <summary>
+        ///   Looks up a localized string similar to Add shell integration.
+        /// </summary>
+        public static string AddShellIntegration {
+            get {
+                return ResourceManager.GetString("AddShellIntegration", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to This will add &quot;{0}&quot; to the registry at &quot;HKCU\dllfile\shell\Open with ILSpy\command\&quot; and &quot;HKCU\exefile\shell\Open with ILSpy\command&quot; to allow opening .dll and .exe files from the Windows Explorer context menu.
+        ///
+        ///Do you want to continue?.
+        /// </summary>
+        public static string AddShellIntegrationMessage {
+            get {
+                return ResourceManager.GetString("AddShellIntegrationMessage", resourceCulture);
+            }
+        }
+        
         /// <summary>
         ///   Looks up a localized string similar to |All Files|*.*.
         /// </summary>
@@ -1666,6 +1686,26 @@ namespace ICSharpCode.ILSpy.Properties {
             }
         }
         
+        /// <summary>
+        ///   Looks up a localized string similar to Remove shell integration.
+        /// </summary>
+        public static string RemoveShellIntegration {
+            get {
+                return ResourceManager.GetString("RemoveShellIntegration", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to This will remove &quot;{0}&quot; from the registry at &quot;HKCU\dllfile\shell\Open with ILSpy\command\&quot; and &quot;HKCU\exefile\shell\Open with ILSpy\command&quot;.
+        ///
+        ///Do you want to continue?.
+        /// </summary>
+        public static string RemoveShellIntegrationMessage {
+            get {
+                return ResourceManager.GetString("RemoveShellIntegrationMessage", resourceCulture);
+            }
+        }
+        
         /// <summary>
         ///   Looks up a localized string similar to Reset to defaults.
         /// </summary>
@@ -1693,6 +1733,15 @@ namespace ICSharpCode.ILSpy.Properties {
             }
         }
         
+        /// <summary>
+        ///   Looks up a localized string similar to Please restart ILSpy.exe as administrator to execute this function!.
+        /// </summary>
+        public static string RestartElevatedMessage {
+            get {
+                return ResourceManager.GetString("RestartElevatedMessage", resourceCulture);
+            }
+        }
+        
         /// <summary>
         ///   Looks up a localized string similar to Save.
         /// </summary>

ILSpy/Properties/Resources.resx

@@ -836,4 +836,23 @@ Are you sure you want to continue?</value>
     <value>Navigation failed because the target is hidden or a compiler-generated class.\n
 Please disable all filters that might hide the item (i.e. activate "View &gt; Show internal types and members") and try again.</value>
   </data>
+  <data name="AddShellIntegration" xml:space="preserve">
+    <value>Add shell integration</value>
+  </data>
+  <data name="AddShellIntegrationMessage" xml:space="preserve">
+    <value>This will add "{0}" to the registry at "HKCU\dllfile\shell\Open with ILSpy\command\" and "HKCU\exefile\shell\Open with ILSpy\command" to allow opening .dll and .exe files from the Windows Explorer context menu.
+
+Do you want to continue?</value>
+  </data>
+  <data name="RemoveShellIntegration" xml:space="preserve">
+    <value>Remove shell integration</value>
+  </data>
+  <data name="RemoveShellIntegrationMessage" xml:space="preserve">
+    <value>This will remove "{0}" from the registry at "HKCU\dllfile\shell\Open with ILSpy\command\" and "HKCU\exefile\shell\Open with ILSpy\command".
+
+Do you want to continue?</value>
+  </data>
+  <data name="RestartElevatedMessage" xml:space="preserve">
+    <value>Please restart ILSpy.exe as administrator to execute this function!</value>
+  </data>
 </root>