add some exception handling for startup and MEF exceptions

ILSpy/App.xaml.cs

@@ -17,6 +17,7 @@
 // DEALINGS IN THE SOFTWARE.
 
 using System;
+using System.Collections.Generic;
 using System.ComponentModel.Composition.Hosting;
 using System.Diagnostics;
 using System.IO;
@@ -26,6 +27,7 @@ using System.Windows;
 using System.Windows.Documents;
 using System.Windows.Navigation;
 using System.Windows.Threading;
+
 using ICSharpCode.ILSpy.Debugger.Services;
 using ICSharpCode.ILSpy.TextView;
 
@@ -44,6 +46,14 @@ namespace ICSharpCode.ILSpy
 		
 		internal static CommandLineArguments CommandLineArguments;
 		
+		internal static IList<ExceptionData> StartupExceptions = new List<ExceptionData>();
+		
+		internal class ExceptionData
+		{
+			public Exception Exception;
+			public string PluginName;
+		}
+		
 		public App()
 		{
 			var cmdArgs = Environment.GetCommandLineArgs().Skip(1);
@@ -65,9 +75,13 @@ namespace ICSharpCode.ILSpy
 			foreach (string plugin in Directory.GetFiles(appPath, "*.Plugin.dll")) {
 				string shortName = Path.GetFileNameWithoutExtension(plugin);
 				try {
-					catalog.Catalogs.Add(new AssemblyCatalog(Assembly.Load(shortName)));
+					var asm = Assembly.Load(shortName);
+					asm.GetTypes();
+					catalog.Catalogs.Add(new AssemblyCatalog(asm));
 				} catch (Exception ex) {
-					MessageBox.Show(ex.ToString(), "Error loading plugin " + shortName);
+					// Cannot show MessageBox here, because WPF would crash with a XamlParseException
+					// Remember and show exceptions in text output, once MainWindow is properly initialized
+					StartupExceptions.Add(new ExceptionData { Exception = ex, PluginName = shortName });
 				}
 			}
 			

ILSpy/MainWindow.xaml.cs

@@ -31,6 +31,7 @@ using System.Windows.Input;
 using System.Windows.Interop;
 using System.Windows.Media;
 using System.Windows.Media.Imaging;
+using ICSharpCode.Decompiler;
 using ICSharpCode.ILSpy.Debugger;
 using ICSharpCode.ILSpy.TextView;
 using ICSharpCode.ILSpy.TreeNodes;
@@ -331,6 +332,34 @@ namespace ICSharpCode.ILSpy
 			}
 			
 			NavigationCommands.Search.InputGestures.Add(new KeyGesture(Key.E, ModifierKeys.Control));
+			
+			AvalonEditTextOutput output = new AvalonEditTextOutput();
+			if (FormatExceptions(App.StartupExceptions.ToArray(), output))
+				decompilerTextView.ShowText(output);
+		}
+		
+		bool FormatExceptions(App.ExceptionData[] exceptions, ITextOutput output)
+		{
+			if (exceptions.Length == 0) return false;
+			bool first = true;
+			
+			foreach (var item in exceptions) {
+				if (first)
+					first = false;
+				else
+					output.WriteLine("-------------------------------------------------");
+				output.WriteLine("Error(s) loading plugin: " + item.PluginName);
+				if (item.Exception is System.Reflection.ReflectionTypeLoadException) {
+					var e = (System.Reflection.ReflectionTypeLoadException)item.Exception;
+					foreach (var ex in e.LoaderExceptions) {
+						output.WriteLine(ex.ToString());
+						output.WriteLine();
+					}
+				} else
+					output.WriteLine(item.Exception.ToString());
+			}
+			
+			return true;
 		}
 		
 		#region Update Check