Fix #2893: Add option to disable automatic assembly loading.

This setting is honored by all functionality that triggers a decompilation run. It is ignored by features that load assemblies as their primary function. For example, using the "Load Dependencies" feature will still resolve and load assemblies from the file-system. The same happens when you double-click on an assembly reference in the tree view. It will be resolved and loaded.

Note that disabling automatic assembly load will cause the decompiler to potentially not be able to resolve types from references that have not been added manually and the quality of the decompiled code will be inferior as a result.

ICSharpCode.Decompiler/DecompilerSettings.cs

@@ -1959,6 +1959,21 @@ public bool ApplyWindowsRuntimeProjections {
 			}
 		}
 
+		bool autoLoadAssemblyReferences = true;
+
+		[Category("DecompilerSettings.Other")]
+		[Description("DecompilerSettings.AutoLoadAssemblyReferences")]
+		public bool AutoLoadAssemblyReferences {
+			get { return autoLoadAssemblyReferences; }
+			set {
+				if (autoLoadAssemblyReferences != value)
+				{
+					autoLoadAssemblyReferences = value;
+					OnPropertyChanged();
+				}
+			}
+		}
+
 		#endregion
 
 		bool forStatement = true;

ILSpy/Commands/GeneratePdbContextMenuEntry.cs

@@ -80,7 +80,7 @@ internal static void GeneratePdbForAssembly(LoadedAssembly assembly)
 				{
 					try
 					{
-						var decompiler = new CSharpDecompiler(file, assembly.GetAssemblyResolver(), options.DecompilerSettings);
+						var decompiler = new CSharpDecompiler(file, assembly.GetAssemblyResolver(options.DecompilerSettings.AutoLoadAssemblyReferences), options.DecompilerSettings);
 						decompiler.CancellationToken = ct;
 						PortablePdbWriter.WritePdb(file, decompiler, options.DecompilerSettings, stream, progress: options.Progress);
 					}

ILSpy/Languages/CSharpLanguage.cs

@@ -122,7 +122,7 @@ public override IReadOnlyList<LanguageVersion> LanguageVersions {
 
 		CSharpDecompiler CreateDecompiler(PEFile module, DecompilationOptions options)
 		{
-			CSharpDecompiler decompiler = new CSharpDecompiler(module, module.GetAssemblyResolver(), options.DecompilerSettings);
+			CSharpDecompiler decompiler = new CSharpDecompiler(module, module.GetAssemblyResolver(options.DecompilerSettings.AutoLoadAssemblyReferences), options.DecompilerSettings);
 			decompiler.CancellationToken = options.CancellationToken;
 			decompiler.DebugInfoProvider = module.GetDebugInfoOrNull();
 			while (decompiler.AstTransforms.Count > transformCount)
@@ -416,7 +416,7 @@ public override ProjectId DecompileAssembly(LoadedAssembly assembly, ITextOutput
 				base.DecompileAssembly(assembly, output, options);
 
 				// don't automatically load additional assemblies when an assembly node is selected in the tree view
-				IAssemblyResolver assemblyResolver = assembly.GetAssemblyResolver(loadOnDemand: options.FullDecompilation);
+				IAssemblyResolver assemblyResolver = assembly.GetAssemblyResolver(loadOnDemand: options.FullDecompilation && options.DecompilerSettings.AutoLoadAssemblyReferences);
 				var typeSystem = new DecompilerTypeSystem(module, assemblyResolver, options.DecompilerSettings);
 				var globalType = typeSystem.MainModule.TypeDefinitions.FirstOrDefault();
 				if (globalType != null)
@@ -507,7 +507,7 @@ class ILSpyWholeProjectDecompiler : WholeProjectDecompiler
 			readonly DecompilationOptions options;
 
 			public ILSpyWholeProjectDecompiler(LoadedAssembly assembly, DecompilationOptions options)
-				: base(options.DecompilerSettings, assembly.GetAssemblyResolver(), assembly.GetAssemblyReferenceClassifier(options.DecompilerSettings.ApplyWindowsRuntimeProjections), assembly.GetDebugInfoOrNull())
+				: base(options.DecompilerSettings, assembly.GetAssemblyResolver(options.DecompilerSettings.AutoLoadAssemblyReferences, options.DecompilerSettings.ApplyWindowsRuntimeProjections), assembly.GetAssemblyReferenceClassifier(options.DecompilerSettings.ApplyWindowsRuntimeProjections), assembly.GetDebugInfoOrNull())
 			{
 				this.assembly = assembly;
 				this.options = options;

ILSpy/Properties/Resources.resx

@@ -282,6 +282,9 @@ Are you sure you want to continue?</value>
   <data name="DecompilerSettings.AsyncEnumerator" xml:space="preserve">
     <value>Decompile async IAsyncEnumerator methods</value>
   </data>
+  <data name="DecompilerSettings.AutoLoadAssemblyReferences" xml:space="preserve">
+    <value>Automatically load assembly references</value>
+  </data>
   <data name="DecompilerSettings.CheckedOperators" xml:space="preserve">
     <value>User-defined checked operators</value>
   </data>

ILSpy/TreeNodes/AssemblyReferenceTreeNode.cs

@@ -75,7 +75,7 @@ public override void ActivateItem(System.Windows.RoutedEventArgs e)
 
 		protected override void LoadChildren()
 		{
-			var resolver = parentAssembly.LoadedAssembly.GetAssemblyResolver();
+			var resolver = parentAssembly.LoadedAssembly.GetAssemblyResolver(MainWindow.Instance.CurrentDecompilerSettings.AutoLoadAssemblyReferences);
 			var module = resolver.Resolve(r);
 			if (module != null)
 			{