Fixed NullReferenceExceptions when Clipboard.GetData returns null.

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@3359 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/AddIns/DisplayBindings/ResourceEditor/Project/Src/DisplayDefinition.cs

@@ -169,6 +169,8 @@ namespace ResourceEditor
 			}
 			
 			IDataObject dob = ClipboardWrapper.GetDataObject();
+			if (dob == null)
+				return;
 			
 			if (dob.GetDataPresent(typeof(Hashtable).FullName)) {
 				Hashtable tmphash = (Hashtable)dob.GetData(typeof(Hashtable));

src/AddIns/Misc/StartPage/Project/Src/StartPage.cs

@@ -53,9 +53,13 @@ namespace ICSharpCode.StartPage
 
 		void pane_WebBrowser_Navigated(object sender, WebBrowserNavigatedEventArgs e)
 		{
-			WebBrowser webBrowser = (WebBrowser)sender;
-			webBrowser.Navigating -= pane_WebBrowser_Navigating;
-			webBrowser.Navigated -= pane_WebBrowser_Navigated;
+			try {
+				WebBrowser webBrowser = (WebBrowser)sender;
+				webBrowser.Navigating -= pane_WebBrowser_Navigating;
+				webBrowser.Navigated -= pane_WebBrowser_Navigated;
+			} catch (Exception ex) {
+				MessageService.ShowError(ex);
+			}
 		}
 
 		void pane_WebBrowser_Navigating(object sender, WebBrowserNavigatingEventArgs e)

src/Libraries/ICSharpCode.TextEditor/Project/Src/Gui/TextAreaClipboardHandler.cs

@@ -174,6 +174,8 @@ namespace ICSharpCode.TextEditor
 			for (int i = 0;; i++) {
 				try {
 					IDataObject data = Clipboard.GetDataObject();
+					if (data == null)
+						return;
 					bool fullLine = data.GetDataPresent(LineSelectedType);
 					if (data.GetDataPresent(DataFormats.UnicodeText)) {
 						string text = (string)data.GetData(DataFormats.UnicodeText);

src/Main/Base/Project/Src/Gui/Pads/ProjectBrowser/TreeNodes/DirectoryNode.cs

@@ -560,6 +560,8 @@ namespace ICSharpCode.SharpDevelop.Project
 		public override void Paste()
 		{
 			IDataObject dataObject = ClipboardWrapper.GetDataObject();
+			if (dataObject == null)
+				return;
 			
 			if (dataObject.GetDataPresent(DataFormats.FileDrop)) {
 				string[] files = (string[])dataObject.GetData(DataFormats.FileDrop);

src/Main/Base/Project/Src/Gui/Pads/ProjectBrowser/TreeNodes/SolutionFolderNode.cs

@@ -150,7 +150,11 @@ namespace ICSharpCode.SharpDevelop.Project
 		
 		public static bool DoEnablePaste(ISolutionFolderNode container)
 		{
-			IDataObject dataObject = ClipboardWrapper.GetDataObject();
+			return DoEnablePaste(container, ClipboardWrapper.GetDataObject());
+		}
+		
+		static bool DoEnablePaste(ISolutionFolderNode container, IDataObject dataObject)
+		{
 			if (dataObject == null) {
 				return false;
 			}
@@ -171,13 +175,13 @@ namespace ICSharpCode.SharpDevelop.Project
 		
 		public static void DoPaste(ISolutionFolderNode folderNode)
 		{
-			if (!DoEnablePaste(folderNode)) {
+			IDataObject dataObject = ClipboardWrapper.GetDataObject();
+			if (!DoEnablePaste(folderNode, dataObject)) {
 				LoggingService.Warn("SolutionFolderNode.DoPaste: Pasting was not enabled.");
 				return;
 			}
 			
 			ExtTreeNode folderTreeNode = (ExtTreeNode)folderNode;
-			IDataObject dataObject = ClipboardWrapper.GetDataObject();
 			
 			if (dataObject.GetDataPresent(typeof(ISolutionFolder).ToString())) {
 				string guid = dataObject.GetData(typeof(ISolutionFolder).ToString()).ToString();

src/Main/ICSharpCode.Core.WinForms/Util/ClipboardWrapper.cs

@@ -43,6 +43,10 @@ namespace ICSharpCode.Core.WinForms
 			SetDataObject(data);
 		}
 		
+		/// <summary>
+		/// Gets the current clipboard content.
+		/// Can return null!
+		/// </summary>
 		public static IDataObject GetDataObject()
 		{
 			// retry 2 times should be enough for read access
@@ -52,7 +56,7 @@ namespace ICSharpCode.Core.WinForms
 				try {
 					return Clipboard.GetDataObject();
 				} catch (ExternalException) {
-					return new DataObject();
+					return null;
 				}
 			}
 		}