Fixed document service retrieval.

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

@@ -13,6 +13,7 @@ using ICSharpCode.AvalonEdit.Document;
 using ICSharpCode.AvalonEdit.Editing;
 using ICSharpCode.AvalonEdit.Highlighting;
 using ICSharpCode.AvalonEdit.Rendering;
+using ICSharpCode.Core;
 using ICSharpCode.SharpDevelop.Editor;
 using ICSharpCode.SharpDevelop.Widgets.MyersDiff;
 
@@ -114,13 +115,13 @@ namespace ICSharpCode.AvalonEdit.AddIn
 			if (oldTextView != null) {
 				oldTextView.VisualLinesChanged -= VisualLinesChanged;
 				oldTextView.ScrollOffsetChanged -= ScrollOffsetChanged;
-				((TextArea)oldTextView.Services.GetService(typeof(TextArea))).KeyDown -= TextViewKeyDown;
+				oldTextView.GetRequiredService<TextArea>().KeyDown -= TextViewKeyDown;
 			}
 			base.OnTextViewChanged(oldTextView, newTextView);
 			if (newTextView != null) {
 				newTextView.VisualLinesChanged += VisualLinesChanged;
 				newTextView.ScrollOffsetChanged += ScrollOffsetChanged;
-				((TextArea)newTextView.Services.GetService(typeof(TextArea))).KeyDown += TextViewKeyDown;
+				newTextView.GetRequiredService<TextArea>().KeyDown += TextViewKeyDown;
 			}
 		}
 
@@ -169,8 +170,8 @@ namespace ICSharpCode.AvalonEdit.AddIn
 			bool added;
 			string oldText = changeWatcher.GetOldVersionFromLine(line, out startLine, out added);
 			
-			TextEditor editor = this.TextView.Services.GetService(typeof(TextEditor)) as TextEditor;
-			markerService = this.TextView.Services.GetService(typeof(ITextMarkerService)) as ITextMarkerService;
+			TextEditor editor = this.TextView.GetService<TextEditor>();
+			markerService = this.TextView.GetService<ITextMarkerService>();
 			
 			LineChangeInfo zeroLineInfo = changeWatcher.GetChange(0);
 			

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

@@ -3,6 +3,7 @@
 
 using System;
 using System.Collections.ObjectModel;
+using System.ComponentModel.Design;
 using System.Diagnostics;
 using System.IO;
 using System.Linq;
@@ -145,9 +146,15 @@ namespace ICSharpCode.AvalonEdit.AddIn
 			
 			this.FlowDirection = FlowDirection.LeftToRight; // code editing is always left-to-right
 			this.document = new TextDocument();
+			var documentServiceContainer = document.GetRequiredService<IServiceContainer>();
 			this.CommandBindings.Add(new CommandBinding(SharpDevelopRoutedCommands.SplitView, OnSplitView));
+			
 			textMarkerService = new TextMarkerService(document);
+			documentServiceContainer.AddService(typeof(ITextMarkerService), textMarkerService);
+			
 			iconBarManager = new IconBarManager();
+			documentServiceContainer.AddService(typeof(IBookmarkMargin), iconBarManager);
+			
 			if (CodeEditorOptions.Instance.EnableChangeMarkerMargin) {
 				changeWatcher = new DefaultChangeWatcher();
 			}
@@ -203,11 +210,9 @@ namespace ICSharpCode.AvalonEdit.AddIn
 			
 			textView.BackgroundRenderers.Add(textMarkerService);
 			textView.LineTransformers.Add(textMarkerService);
-			textView.Services.AddService(typeof(ITextMarkerService), textMarkerService);
 			
 			textView.Services.AddService(typeof(IEditorUIService), new AvalonEditEditorUIService(textView));
 			
-			textView.Services.AddService(typeof(IBookmarkMargin), iconBarManager);
 			codeEditorView.TextArea.LeftMargins.Insert(0, new IconBarMargin(iconBarManager));
 			
 			if (changeWatcher != null) {
@@ -235,7 +240,7 @@ namespace ICSharpCode.AvalonEdit.AddIn
 		{
 			foreach (var d in textEditor.TextArea.LeftMargins.OfType<IDisposable>())
 				d.Dispose();
-			((EnhancedScrollBar)textEditor.TextArea.GetService(typeof(EnhancedScrollBar))).Dispose();
+			textEditor.TextArea.GetRequiredService<EnhancedScrollBar>().Dispose();
 			textEditor.Dispose();
 		}
 		

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

@@ -166,7 +166,7 @@ namespace ICSharpCode.AvalonEdit.AddIn
 			dragDropBookmark = bm;
 			dragDropStartPoint = dragDropCurrentPoint = e.GetPosition(this).Y;
 			if (TextView != null) {
-				TextArea area = TextView.Services.GetService(typeof(TextArea)) as TextArea;
+				TextArea area = TextView.GetService(typeof(TextArea)) as TextArea;
 				if (area != null)
 					area.PreviewKeyDown += TextArea_PreviewKeyDown;
 			}
@@ -178,7 +178,7 @@ namespace ICSharpCode.AvalonEdit.AddIn
 				dragDropBookmark = null;
 				dragStarted = false;
 				if (TextView != null) {
-					TextArea area = TextView.Services.GetService(typeof(TextArea)) as TextArea;
+					TextArea area = TextView.GetService(typeof(TextArea)) as TextArea;
 					if (area != null)
 						area.PreviewKeyDown -= TextArea_PreviewKeyDown;
 				}
@@ -238,7 +238,7 @@ namespace ICSharpCode.AvalonEdit.AddIn
 				}
 				if (e.ChangedButton == MouseButton.Left && TextView != null) {
 					// no bookmark on the line: create a new breakpoint
-					ITextEditor textEditor = TextView.Services.GetService(typeof(ITextEditor)) as ITextEditor;
+					ITextEditor textEditor = TextView.GetService(typeof(ITextEditor)) as ITextEditor;
 					if (textEditor != null) {
 						DebuggerService.ToggleBreakpointAt(textEditor, line, typeof(BreakpointBookmark));
 						return;
@@ -247,7 +247,7 @@ namespace ICSharpCode.AvalonEdit.AddIn
 					// create breakpoint for the other posible active contents
 					var viewContent = WorkbenchSingleton.Workbench.ActiveContent as AbstractViewContentWithoutFile;
 					if (viewContent != null) {
-						textEditor = viewContent.Services.GetService(typeof(ITextEditor)) as ITextEditor;
+						textEditor = viewContent.GetService(typeof(ITextEditor)) as ITextEditor;
 						if (textEditor != null) {
 							DebuggerService.ToggleBreakpointAt(textEditor, line, typeof(DecompiledBreakpointBookmark));
 							return;

src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Editing/LineNumberMargin.cs

@@ -79,7 +79,7 @@ namespace ICSharpCode.AvalonEdit.Editing
 				newTextView.VisualLinesChanged += TextViewVisualLinesChanged;
 				
 				// find the text area belonging to the new text view
-				textArea = newTextView.Services.GetService(typeof(TextArea)) as TextArea;
+				textArea = newTextView.GetService(typeof(TextArea)) as TextArea;
 			} else {
 				textArea = null;
 			}

src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Editing/TextArea.cs

@@ -995,7 +995,7 @@ namespace ICSharpCode.AvalonEdit.Editing
 		/// <returns>Returns the requested service instance, or null if the service cannot be found.</returns>
 		public virtual object GetService(Type serviceType)
 		{
-			return textView.Services.GetService(serviceType);
+			return textView.GetService(serviceType);
 		}
 		
 		/// <summary>

src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Rendering/TextView.cs

@@ -1757,6 +1757,11 @@ namespace ICSharpCode.AvalonEdit.Rendering
 		/// <summary>
 		/// Gets a service container used to associate services with the text view.
 		/// </summary>
+		/// <remarks>
+		/// This container does not provide document services -
+		/// use <c>TextView.GetService()</c> instead of <c>TextView.Services.GetService()</c> to ensure
+		/// that document services can be found as well.
+		/// </remarks>
 		public ServiceContainer Services {
 			get { return services; }
 		}
@@ -1766,7 +1771,7 @@ namespace ICSharpCode.AvalonEdit.Rendering
 		/// If the service is not found in the <see cref="Services"/> container,
 		/// this method will also look for it in the current document's service provider.
 		/// </summary>
-		public object GetService(Type serviceType)
+		public virtual object GetService(Type serviceType)
 		{
 			object instance = services.GetService(serviceType);
 			if (instance == null && document != null) {

src/Main/Base/Project/Src/Services/File/OpenedFile.cs

@@ -124,6 +124,7 @@ namespace ICSharpCode.SharpDevelop
 			if (view == null)
 				throw new ArgumentNullException("view");
 			
+			bool success = false;
 			try {
 				if (currentView != view) {
 					if (currentView == null) {
@@ -139,9 +140,14 @@ namespace ICSharpCode.SharpDevelop
 						}
 					}
 				}
-			} catch (Exception) {
-				view.Dispose();
-				throw;
+				success = true;
+			} finally {
+				// Only in case of exceptions:
+				// (try-finally with bool is better than try-catch-rethrow because it causes the debugger to stop
+				// at the original error location, not at the rethrow)
+				if (!success) {
+					view.Dispose();
+				}
 			}
 		}
 		

src/Main/Base/Project/Src/Services/Tasks/ErrorPainter.cs

@@ -24,10 +24,7 @@ namespace ICSharpCode.SharpDevelop
 		{
 			instances.Add(this);
 			this.textEditor = textEditor;
-			this.markerService = this.textEditor.GetService(typeof(ITextMarkerService)) as ITextMarkerService;
-			
-			if (this.markerService == null)
-				throw new InvalidOperationException("this ITextEditor has no text marker service!");
+			this.markerService = this.textEditor.GetRequiredService<ITextMarkerService>();
 			
 			TaskService.Added   += OnAdded;
 			TaskService.Removed += OnRemoved;

src/Main/Core/Project/Src/Services/ServiceSingleton.cs

@@ -36,11 +36,19 @@ namespace ICSharpCode.Core
 			}
 		}
 		
+		/// <summary>
+		/// Retrieves the service of type <c>T</c> from the provider.
+		/// If the service cannot be found, this method returns <c>null</c>.
+		/// </summary>
 		public static T GetService<T>(this IServiceProvider provider) where T : class
 		{
 			return (T)provider.GetService(typeof(T));
 		}
 		
+		/// <summary>
+		/// Retrieves the service of type <c>T</c> from the provider.
+		/// If the service cannot be found, a <see cref="ServiceNotFoundException"/> will be thrown.
+		/// </summary>
 		public static T GetRequiredService<T>(this IServiceProvider provider) where T : class
 		{
 			object service = provider.GetService(typeof(T));