feat(UI): Use AssemblyWarning when AssemblyReference load faulted

Allow you to easily and quickly see the reference libraries not found fixes icsharpcode#2932

ILSpy/Images/AssemblyLoading.xaml

@@ -0,0 +1,28 @@
+<?xml version="1.0" ?>
+<DrawingGroup  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
+	<DrawingGroup.ClipGeometry>
+		<RectangleGeometry Rect="0.0,0.0,16.0,16.0"/>
+	</DrawingGroup.ClipGeometry>
+	<GeometryDrawing Brush="#fff6f6f6">
+		<GeometryDrawing.Geometry>
+			<PathGeometry Figures="M 16 3 v 9 H 8 V 9 H 6 v 2 H 0 V 4 h 6 v 2 h 2 V 3 h 8 z" FillRule="Nonzero"/>
+		</GeometryDrawing.Geometry>
+	</GeometryDrawing>
+	<GeometryDrawing Brush="#ff424242">
+		<GeometryDrawing.Geometry>
+			<PathGeometry Figures="M 1 5 h 4 v 5 H 1 z M 9 4 h 6 v 7 H 9 z M 6 7 h 2 v 1 H 6 z" FillRule="Nonzero"/>
+		</GeometryDrawing.Geometry>
+	</GeometryDrawing>
+	<GeometryDrawing Brush="#fff6f6f6">
+		<GeometryDrawing.Geometry>
+			<PathGeometry Figures="m 16 12 c 0 2.2055 -1.7945 4 -4 4 C 9.7945 16 8 14.2055 8 12 A 3.995 3.995 0 0 1 8.544 10 H 8 v -2 H 12 V 12 h -2 c 0 1.103 0.896999 2 2 2 c 1.103 0 2 -0.897 2 -2 c 0 -0.672 -0.3345 -1.295 -0.895 -1.667 l -0.4165 -0.277 l 1.1075 -1.666 l 0.4165 0.2765 A 3.996 3.996 0 0 1 16 12 Z" FillRule="Nonzero"/>
+		</GeometryDrawing.Geometry>
+	</GeometryDrawing>
+	<DrawingGroup Transform="0.49999992,0.0,0.0,0.49999992,8.000001,8.000001">
+		<GeometryDrawing Brush="#ff00539c">
+			<GeometryDrawing.Geometry>
+				<PathGeometry Figures="m 15 8 c 0 3.859 -3.141 7 -7 7 C 4.14 15 1 11.859 1 8 A 7 7 0 0 1 3.12 3 H 1 V 1 H 7 V 7 H 5 V 4.002 A 5.01 5.01 0 0 0 3 8 c 0 2.757 2.243 5 5 5 c 2.757 0 5 -2.243 5 -5 A 4.993 4.993 0 0 0 10.764 3.833 L 11.871 2.167 A 6.989 6.989 0 0 1 15 8 Z" FillRule="Nonzero"/>
+			</GeometryDrawing.Geometry>
+		</GeometryDrawing>
+	</DrawingGroup>
+</DrawingGroup>

ILSpy/Images/Images.cs

@@ -51,6 +51,7 @@ static ImageSource Load(string icon)
 
 		public static readonly ImageSource Assembly = Load("Assembly");
 		public static readonly ImageSource AssemblyWarning = Load("AssemblyWarning");
+		public static readonly ImageSource AssemblyLoading = Load(nameof(AssemblyLoading));
 		public static readonly ImageSource FindAssembly = Load("FindAssembly");
 
 		public static readonly ImageSource Library = Load("Library");

ILSpy/TreeNodes/AssemblyReferenceTreeNode.cs

@@ -1,14 +1,14 @@
 // Copyright (c) 2011 AlphaSierraPapa for the SharpDevelop Team
-// 
+//
 // Permission is hereby granted, free of charge, to any person obtaining a copy of this
 // software and associated documentation files (the "Software"), to deal in the Software
 // without restriction, including without limitation the rights to use, copy, modify, merge,
 // publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
 // to whom the Software is furnished to do so, subject to the following conditions:
-// 
+//
 // The above copyright notice and this permission notice shall be included in all copies or
 // substantial portions of the Software.
-// 
+//
 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
 // INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 // PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
@@ -30,9 +30,18 @@ namespace ICSharpCode.ILSpy.TreeNodes
 	/// </summary>
 	public sealed class AssemblyReferenceTreeNode : ILSpyTreeNode
 	{
+		private enum LoadState
+		{
+			Unloaded,
+			Loading,
+			Loadded,
+			Failed
+		}
 		readonly MetadataModule module;
 		readonly AssemblyReference r;
 		readonly AssemblyTreeNode parentAssembly;
+		MetadataFile referencedModule;
+		private LoadState state;
 
 		public AssemblyReferenceTreeNode(MetadataModule module, AssemblyReference r, AssemblyTreeNode parentAssembly)
 		{
@@ -48,7 +57,27 @@ public override object Text {
 			get { return Language.EscapeName(r.Name) + GetSuffixString(r.Handle); }
 		}
 
-		public override object Icon => Images.Assembly;
+		public override object Icon {
+			get {
+				if (state == LoadState.Unloaded)
+				{
+					state = LoadState.Loading;
+					Dispatcher.CurrentDispatcher.BeginInvoke(() => {
+						var resolver = parentAssembly.LoadedAssembly.GetAssemblyResolver(MainWindow.Instance.CurrentDecompilerSettings.AutoLoadAssemblyReferences);
+						referencedModule = resolver.Resolve(r);
+						state = referencedModule is null
+							? LoadState.Failed
+							: LoadState.Loadded;
+						RaisePropertyChanged(nameof(Icon));
+					}, DispatcherPriority.Background);
+				}
+				return state switch {
+					LoadState.Loadded => Images.Assembly,
+					LoadState.Failed => Images.AssemblyWarning,
+					_ => Images.AssemblyLoading,
+				};
+			}
+		}
 
 		public override bool ShowExpander {
 			get {
@@ -60,7 +89,7 @@ public override bool ShowExpander {
 					// while the list of references is updated causes problems with WPF's ListView rendering.
 					// Moving the assembly resolving out of the "add assembly reference"-loop by using the
 					// dispatcher fixes the issue.
-					Dispatcher.CurrentDispatcher.BeginInvoke((Action)EnsureLazyChildren, DispatcherPriority.Normal);
+					Dispatcher.CurrentDispatcher.BeginInvoke(EnsureLazyChildren, DispatcherPriority.Normal);
 				}
 				return base.ShowExpander;
 			}
@@ -79,10 +108,7 @@ public override void ActivateItem(System.Windows.RoutedEventArgs e)
 		protected override void LoadChildren()
 		{
 			this.Children.Add(new AssemblyReferenceReferencedTypesTreeNode(module, r));
-
-			var resolver = parentAssembly.LoadedAssembly.GetAssemblyResolver(MainWindow.Instance.CurrentDecompilerSettings.AutoLoadAssemblyReferences);
-			var referencedModule = resolver.Resolve(r);
-			if (referencedModule != null)
+			if (referencedModule is not null)
 			{
 				var module = (MetadataModule)referencedModule.GetTypeSystemWithCurrentOptionsOrNull().MainModule;
 				foreach (var childRef in referencedModule.AssemblyReferences)
@@ -106,7 +132,10 @@ public override void Decompile(Language language, ITextOutput output, Decompilat
 				output.Indent();
 				language.WriteCommentLine(output, "Assembly reference loading information:");
 				if (info.HasErrors)
+				{
 					language.WriteCommentLine(output, "There were some problems during assembly reference load, see below for more information!");
+					state = LoadState.Failed;
+				}
 				foreach (var item in info.Messages)
 				{
 					language.WriteCommentLine(output, $"{item.Item1}: {item.Item2}");