The method insight window can be invoked by pressing the "Control|Shift|Space" combination.

Cherry-picked from pull request #728

src/AddIns/BackendBindings/AspNet.Mvc/Project/Src/Completion/RazorCSharpCompletionBinding.cs

@@ -48,6 +48,11 @@ namespace ICSharpCode.AspNet.Mvc.Completion
 			return false;
 		}
 
+		public bool CtrlShiftSpace(ITextEditor editor)
+		{
+			return false;
+		}
+
 		public CodeCompletionKeyPressResult HandleKeyPress(ITextEditor editor, char ch)
 		{
 			// We use HandleKeyPressed instead.

src/AddIns/BackendBindings/CSharpBinding/Project/Src/Completion/CSharpCompletionBinding.cs

@@ -71,17 +71,13 @@ namespace CSharpBinding.Completion
 			return ShowCompletion(editor, '\0', true);
 		}
 
-		bool ShowCompletion(ITextEditor editor, char completionChar, bool ctrlSpace)
+		public bool CtrlShiftSpace(ITextEditor editor)
 		{
-			CSharpCompletionContext completionContext;
+			return ShowInsight(editor);
-			if (fileContent == null) {
-				completionContext = CSharpCompletionContext.Get(editor);
-			} else {
-				completionContext = CSharpCompletionContext.Get(editor, context, currentLocation, fileContent);
 		}
-			if (completionContext == null)
-				return false;
 
+		private int GetCaretOffset(ITextEditor editor, CSharpCompletionContext completionContext)
+		{
 			int caretOffset;
 			if (fileContent == null) {
 				caretOffset = editor.Caret.Offset;
@@ -89,6 +85,27 @@ namespace CSharpBinding.Completion
 			} else {
 				caretOffset = completionContext.Document.GetOffset(currentLocation);
 			}
+			return caretOffset;
+		}
+
+		CSharpCompletionContext GetCompletionContext(ITextEditor editor)
+		{
+			CSharpCompletionContext completionContext;
+			if (fileContent == null) {
+				completionContext = CSharpCompletionContext.Get(editor);
+			} else {
+				completionContext = CSharpCompletionContext.Get(editor, context, currentLocation, fileContent);
+			}
+			return completionContext;
+		}
+		
+		bool ShowCompletion(ITextEditor editor, char completionChar, bool ctrlSpace)
+		{
+			var completionContext = GetCompletionContext(editor);
+			if (completionContext == null)
+				return false;
+
+			int caretOffset = GetCaretOffset(editor, completionContext);
 
 			var completionFactory = new CSharpCompletionDataFactory(completionContext, new CSharpResolver(completionContext.TypeResolveContextAtCaret));
 			
@@ -139,7 +156,36 @@ namespace CSharpBinding.Completion
 				return true;
 			}
 			
-			if (CodeCompletionOptions.InsightEnabled && !ctrlSpace) {
+			if (!ctrlSpace) {
+				// Method Insight
+				// Method Insight
+				return ShowInsight(caretOffset, completionContext, completionFactory, completionChar);
+			}
+			return false;
+		}
+
+		bool ShowInsight(ITextEditor editor)
+		{
+			var completionContext = GetCompletionContext(editor);
+			if (completionContext == null)
+				return false;
+
+			int caretOffset = GetCaretOffset(editor, completionContext);
+
+			var completionFactory = new CSharpCompletionDataFactory(
+				completionContext,
+				new CSharpResolver(completionContext.TypeResolveContextAtCaret));
+
+			return ShowInsight(caretOffset, completionContext, completionFactory, '(');
+		}
+
+		bool ShowInsight(
+			int caretOffset,
+			CSharpCompletionContext completionContext,
+			CSharpCompletionDataFactory completionFactory,
+			char completionChar)
+		{
+			if (CodeCompletionOptions.InsightEnabled) {
 				// Method Insight
 				var pce = new CSharpParameterCompletionEngine(
 					completionContext.Document,

src/AddIns/BackendBindings/XamlBinding/XamlBinding/XamlCodeCompletionBinding.cs

@@ -244,6 +244,11 @@ namespace ICSharpCode.XamlBinding
 			return false;
 		}
 
+		public bool CtrlShiftSpace(ITextEditor editor)
+		{
+			return false;
+		}
+
 		void DoTriggerCompletion(XamlCompletionContext context, XamlCompletionItemList completionList)
 		{
 			bool isExplicit;

src/AddIns/DisplayBindings/AvalonEdit.AddIn/Src/CodeEditor.cs

@@ -229,6 +229,8 @@ namespace ICSharpCode.AvalonEdit.AddIn
 			codeEditorView.TextArea.SelectionChanged += TextAreaSelectionChanged;
 			codeEditorView.TextArea.DefaultInputHandler.CommandBindings.Add(
 				new CommandBinding(CustomCommands.CtrlSpaceCompletion, OnCodeCompletion));
+			codeEditorView.TextArea.DefaultInputHandler.CommandBindings.Add(
+				new CommandBinding(CustomCommands.CtrlShiftSpaceInsight, OnCodeInsight));
 			SearchPanel.Install(codeEditorView.TextArea);
 			
 			textView.BackgroundRenderers.Add(textMarkerService);
@@ -619,6 +621,24 @@ namespace ICSharpCode.AvalonEdit.AddIn
 			}
 		}
 
+		void OnCodeInsight(object sender, ExecutedRoutedEventArgs e)
+		{
+			if (InsightWindow != null)
+				InsightWindow.Close();
+
+			// disable all code insight bindings when Insight is disabled
+			if (!CodeCompletionOptions.InsightEnabled)
+				return;
+
+			CodeEditorView textEditor = GetTextEditorFromSender(sender);
+			foreach (ICodeCompletionBinding cc in CodeCompletionBindings) {
+				if (cc.CtrlShiftSpace(textEditor.Adapter)) {
+					e.Handled = true;
+					break;
+				}
+			}
+		}
+		
 		void FetchParseInformation()
 		{
 			ParseInformation parseInfo = SD.ParserService.GetCachedParseInformation(this.FileName);

src/AddIns/DisplayBindings/AvalonEdit.AddIn/Src/CustomCommands.cs

@@ -31,5 +31,11 @@ namespace ICSharpCode.AvalonEdit.AddIn
 			new InputGestureCollection {
 				new KeyGesture(Key.Space, ModifierKeys.Control)
 			});
+
+		public static readonly RoutedCommand CtrlShiftSpaceInsight = new RoutedCommand(
+			"CtrlShiftSpaceInsight", typeof(CodeEditor),
+			new InputGestureCollection {
+				new KeyGesture(Key.Space, ModifierKeys.Control | ModifierKeys.Shift)
+			});
 	}
 }

src/AddIns/DisplayBindings/XmlEditor/Project/Src/XmlCodeCompletionBinding.cs

@@ -99,6 +99,11 @@ namespace ICSharpCode.XmlEditor
 			return false;
 		}
 
+		public bool CtrlShiftSpace(ITextEditor editor)
+		{
+			return false;
+		}
+		
 		bool ElementStartsWith(string text, int elementStartIndex, ITextSource document)
 		{
 			int textLength = Math.Min(text.Length, document.TextLength - elementStartIndex);

src/Main/Base/Project/Editor/CodeCompletion/CodeCompletionBinding.cs

@@ -51,6 +51,12 @@ namespace ICSharpCode.SharpDevelop.Editor.CodeCompletion
 		/// </summary>
 		/// <returns>Returns whether the completion binding has shown code completion.</returns>
 		bool CtrlSpace(ITextEditor editor);
+
+		/// <summary>
+		/// Invokes ctrl-shift-space code insight.
+		/// </summary>
+		/// <returns>Returns whether the completion binding has shown code insight.</returns>
+		bool CtrlShiftSpace(ITextEditor editor);
 	}
 	
 	/// <summary>
@@ -165,5 +171,13 @@ namespace ICSharpCode.SharpDevelop.Editor.CodeCompletion
 			else
 				return false;
 		}
+
+		public bool CtrlShiftSpace(ITextEditor editor)
+		{
+			if (MatchesExtension(editor))
+				return binding.CtrlShiftSpace(editor);
+			else
+				return false;
+		}
 	}
 }