Add "Base Types" node.

ILSpy/AssemblyReferenceTreeNode.cs

@@ -35,6 +35,14 @@ namespace ICSharpCode.ILSpy
 			get { return Images.Assembly; }
 		}
 		
+		public override bool ShowExpander {
+			get {
+				if (r.Name == "mscorlib")
+					EnsureLazyChildren(); // likely doesn't have any children
+				return base.ShowExpander;
+			}
+		}
+		
 		public override void ActivateItem(System.Windows.RoutedEventArgs e)
 		{
 			var assemblyListNode = parentAssembly.Parent as AssemblyListTreeNode;

ILSpy/BaseTypesTreeNode.cs

@@ -0,0 +1,89 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under MIT X11 license (for details please see \doc\license.txt)
+
+using System;
+using ICSharpCode.TreeView;
+using Mono.Cecil;
+
+namespace ICSharpCode.ILSpy
+{
+	/// <summary>
+	/// Lists the base types of a class.
+	/// </summary>
+	sealed class BaseTypesTreeNode : SharpTreeNode
+	{
+		readonly TypeDefinition type;
+		
+		public BaseTypesTreeNode(TypeDefinition type)
+		{
+			this.type = type;
+			this.LazyLoading = true;
+		}
+		
+		public override object Text {
+			get { return "Base Types"; }
+		}
+		
+		public override object Icon {
+			get { return Images.Undo; }
+		}
+		
+		protected override void LoadChildren()
+		{
+			AddBaseTypes(this.Children, type);
+		}
+		
+		static void AddBaseTypes(SharpTreeNodeCollection children, TypeDefinition type)
+		{
+			if (type.BaseType != null)
+				children.Add(new EntryNode(type.BaseType, false));
+			foreach (TypeReference i in type.Interfaces) {
+				children.Add(new EntryNode(i, true));
+			}
+		}
+		
+		sealed class EntryNode : SharpTreeNode
+		{
+			TypeReference tr;
+			TypeDefinition def;
+			bool isInterface;
+			
+			public EntryNode(TypeReference tr, bool isInterface)
+			{
+				if (tr == null)
+					throw new ArgumentNullException("tr");
+				this.tr = tr;
+				this.def = tr.Resolve();
+				this.isInterface = isInterface;
+				this.LazyLoading = true;
+			}
+			
+			public override bool ShowExpander {
+				get {
+					if (isInterface || tr.FullName == "System.Object")
+						EnsureLazyChildren(); // need to create children to test whether we have any
+					return base.ShowExpander;
+				}
+			}
+			
+			public override object Text {
+				get { return tr.FullName; }
+			}
+			
+			public override object Icon {
+				get {
+					if (def != null)
+						return TypeTreeNode.GetIcon(def);
+					else
+						return isInterface ? Images.Interface : Images.Class;
+				}
+			}
+			
+			protected override void LoadChildren()
+			{
+				if (def != null)
+					AddBaseTypes(this.Children, def);
+			}
+		}
+	}
+}

ILSpy/ILSpy.csproj

@@ -71,6 +71,7 @@
     <Compile Include="AssemblyListTreeNode.cs" />
     <Compile Include="AssemblyReferenceTreeNode.cs" />
     <Compile Include="AssemblyTreeNode.cs" />
+    <Compile Include="BaseTypesTreeNode.cs" />
     <Compile Include="ExtensionMethods.cs" />
     <Compile Include="FieldTreeNode.cs" />
     <Compile Include="Fusion.cs" />
@@ -158,5 +159,9 @@
     <Resource Include="Images\ReferenceFolder.Closed.png" />
     <Resource Include="Images\ReferenceFolder.Open.png" />
   </ItemGroup>
+  <ItemGroup>
+    <Resource Include="Images\Redo.png" />
+    <Resource Include="Images\Undo.png" />
+  </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.Targets" />
 </Project>

ILSpy/Images/Images.cs

@@ -21,6 +21,9 @@ namespace ICSharpCode.ILSpy
 		public static readonly BitmapImage ReferenceFolderOpen = LoadBitmap("ReferenceFolder.Open");
 		public static readonly BitmapImage ReferenceFolderClosed = LoadBitmap("ReferenceFolder.Closed");
 		
+		public static readonly BitmapImage Redo = LoadBitmap("Redo");
+		public static readonly BitmapImage Undo = LoadBitmap("Undo");
+		
 		
 		public static readonly BitmapImage Class = LoadBitmap("Class");
 		public static readonly BitmapImage Delegate = LoadBitmap("Delegate");

ILSpy/OpenFromGacDialog.xaml.cs

@@ -45,7 +45,7 @@ namespace ICSharpCode.ILSpy
 		}
 		
 		#region Fetch Gac Contents
-		sealed class GacEntry : IEquatable<GacEntry>
+		sealed class GacEntry
 		{
 			readonly AssemblyNameReference r;
 			readonly string fileName;
@@ -89,32 +89,21 @@ namespace ICSharpCode.ILSpy
 			{
 				return r.FullName;
 			}
-			
-			public override int GetHashCode()
-			{
-				return r.FullName.GetHashCode();
-			}
-			
-			public override bool Equals(object obj)
-			{
-				return Equals(obj as GacEntry);
-			}
-			
-			public bool Equals(GacEntry o)
-			{
-				return o != null && r.FullName == o.r.FullName;
-			}
 		}
 		
 		void FetchGacContents()
 		{
-			var entries =
-				from r in GacInterop.GetGacAssemblyFullNames()
-				let file = GacInterop.FindAssemblyInNetGac(r)
-				where file != null
-				select new GacEntry(r, file);
-			foreach (var entry in entries.Distinct()) {
-				Dispatcher.BeginInvoke(DispatcherPriority.Normal, new Action<GacEntry>(AddNewEntry), entry);
+			HashSet<string> fullNames = new HashSet<string>();
+			foreach (var r in GacInterop.GetGacAssemblyFullNames()) {
+				if (cancelFetchThread)
+					return;
+				if (fullNames.Add(r.FullName)) { // filter duplicates
+					var file = GacInterop.FindAssemblyInNetGac(r);
+					if (file != null) {
+						var entry = new GacEntry(r, file);
+						Dispatcher.BeginInvoke(DispatcherPriority.Normal, new Action<GacEntry>(AddNewEntry), entry);
+					}
+				}
 			}
 		}
 		

ILSpy/TypeTreeNode.cs

@@ -36,15 +36,9 @@ namespace ICSharpCode.ILSpy
 			get { return type.Name; }
 		}
 		
-		public TypeAttributes Visibility {
-			get {
-				return type.Attributes & TypeAttributes.VisibilityMask;
-			}
-		}
-		
 		public bool IsPublicAPI {
 			get {
-				switch (this.Visibility) {
+				switch (type.Attributes & TypeAttributes.VisibilityMask) {
 					case TypeAttributes.Public:
 					case TypeAttributes.NestedPublic:
 					case TypeAttributes.NestedFamily:
@@ -58,6 +52,7 @@ namespace ICSharpCode.ILSpy
 		
 		protected override void LoadChildren()
 		{
+			this.Children.Add(new BaseTypesTreeNode(type));
 			foreach (TypeDefinition nestedType in type.NestedTypes) {
 				this.Children.Add(new TypeTreeNode(nestedType));
 			}
@@ -79,7 +74,7 @@ namespace ICSharpCode.ILSpy
 			Delegate
 		}
 		
-		ClassType GetClassType()
+		static ClassType GetClassType(TypeDefinition type)
 		{
 			if (type.IsValueType) {
 				if (type.IsEnum)
@@ -98,46 +93,51 @@ namespace ICSharpCode.ILSpy
 		
 		public override object Icon {
 			get {
-				switch (this.Visibility) {
-					case TypeAttributes.Public:
-					case TypeAttributes.NestedPublic:
-						switch (this.GetClassType()) {
-								case ClassType.Delegate:  return Images.Delegate;
-								case ClassType.Enum:      return Images.Enum;
-								case ClassType.Interface: return Images.Interface;
-								case ClassType.Struct:    return Images.Struct;
-								default:                  return Images.Class;
-						}
-					case TypeAttributes.NotPublic:
-					case TypeAttributes.NestedAssembly:
-					case TypeAttributes.NestedFamANDAssem:
-						switch (this.GetClassType()) {
-								case ClassType.Delegate:  return Images.InternalDelegate;
-								case ClassType.Enum:      return Images.InternalEnum;
-								case ClassType.Interface: return Images.InternalInterface;
-								case ClassType.Struct:    return Images.InternalStruct;
-								default:                  return Images.InternalClass;
-						}
-					case TypeAttributes.NestedFamily:
-					case TypeAttributes.NestedFamORAssem:
-						switch (this.GetClassType()) {
-								case ClassType.Delegate:  return Images.ProtectedDelegate;
-								case ClassType.Enum:      return Images.ProtectedEnum;
-								case ClassType.Interface: return Images.ProtectedInterface;
-								case ClassType.Struct:    return Images.ProtectedStruct;
-								default:                  return Images.ProtectedClass;
-						}
-					case TypeAttributes.NestedPrivate:
-						switch (this.GetClassType()) {
-								case ClassType.Delegate:  return Images.PrivateDelegate;
-								case ClassType.Enum:      return Images.PrivateEnum;
-								case ClassType.Interface: return Images.PrivateInterface;
-								case ClassType.Struct:    return Images.PrivateStruct;
-								default:                  return Images.PrivateClass;
-						}
-					default:
-						throw new NotSupportedException(this.Visibility.ToString());
-				}
+				return GetIcon(type);
+			}
+		}
+		
+		public static ImageSource GetIcon(TypeDefinition type)
+		{
+			switch (type.Attributes & TypeAttributes.VisibilityMask) {
+				case TypeAttributes.Public:
+				case TypeAttributes.NestedPublic:
+					switch (GetClassType(type)) {
+							case ClassType.Delegate:  return Images.Delegate;
+							case ClassType.Enum:      return Images.Enum;
+							case ClassType.Interface: return Images.Interface;
+							case ClassType.Struct:    return Images.Struct;
+							default:                  return Images.Class;
+					}
+				case TypeAttributes.NotPublic:
+				case TypeAttributes.NestedAssembly:
+				case TypeAttributes.NestedFamANDAssem:
+					switch (GetClassType(type)) {
+							case ClassType.Delegate:  return Images.InternalDelegate;
+							case ClassType.Enum:      return Images.InternalEnum;
+							case ClassType.Interface: return Images.InternalInterface;
+							case ClassType.Struct:    return Images.InternalStruct;
+							default:                  return Images.InternalClass;
+					}
+				case TypeAttributes.NestedFamily:
+				case TypeAttributes.NestedFamORAssem:
+					switch (GetClassType(type)) {
+							case ClassType.Delegate:  return Images.ProtectedDelegate;
+							case ClassType.Enum:      return Images.ProtectedEnum;
+							case ClassType.Interface: return Images.ProtectedInterface;
+							case ClassType.Struct:    return Images.ProtectedStruct;
+							default:                  return Images.ProtectedClass;
+					}
+				case TypeAttributes.NestedPrivate:
+					switch (GetClassType(type)) {
+							case ClassType.Delegate:  return Images.PrivateDelegate;
+							case ClassType.Enum:      return Images.PrivateEnum;
+							case ClassType.Interface: return Images.PrivateInterface;
+							case ClassType.Struct:    return Images.PrivateStruct;
+							default:                  return Images.PrivateClass;
+					}
+				default:
+					throw new NotSupportedException();
 			}
 		}
 		#endregion