Add "Select PDB..." context menu item on assemblies, to be able to manually load a PDB for an assembly.

ILSpy/AssemblyList.cs

@@ -244,16 +244,22 @@ namespace ICSharpCode.ILSpy
 			if (target == null)
 				return null;
 
+			return ReloadAssembly(target);
+		}
+
+		public LoadedAssembly ReloadAssembly(LoadedAssembly target)
+		{
 			var index = this.assemblies.IndexOf(target);
-			var newAsm = new LoadedAssembly(this, file);
+			var newAsm = new LoadedAssembly(this, target.FileName);
 			newAsm.IsAutoLoaded = target.IsAutoLoaded;
+			newAsm.PdbFileOverride = target.PdbFileOverride;
 			lock (assemblies) {
 				this.assemblies.Remove(target);
 				this.assemblies.Insert(index, newAsm);
 			}
 			return newAsm;
 		}
-		
+
 		public void Unload(LoadedAssembly assembly)
 		{
 			App.Current.Dispatcher.VerifyAccess();

ILSpy/Commands/GeneratePdbContextMenuEntry.cs

@@ -29,6 +29,7 @@ using ICSharpCode.ILSpy.TextView;
 using ICSharpCode.ILSpy.TreeNodes;
 using Microsoft.Win32;
 using ICSharpCode.ILSpy.Properties;
+
 namespace ICSharpCode.ILSpy
 {
 	[ExportContextMenuEntry(Header = "Generate portable PDB")]

ILSpy/Commands/SelectPdbContextMenuEntry.cs

@@ -0,0 +1,56 @@
+// Copyright (c) 2018 Siegfried Pammer
+// 
+// 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
+// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+using System.IO;
+using System.Linq;
+using ICSharpCode.ILSpy.TextView;
+using ICSharpCode.ILSpy.TreeNodes;
+using Microsoft.Win32;
+namespace ICSharpCode.ILSpy
+{
+	[ExportContextMenuEntry(Header = "Select PDB...")]
+	class SelectPdbContextMenuEntry : IContextMenuEntry
+	{
+		public void Execute(TextViewContext context)
+		{
+			var assembly = (context.SelectedTreeNodes?.FirstOrDefault() as AssemblyTreeNode)?.LoadedAssembly;
+			if (assembly == null) return;
+			OpenFileDialog dlg = new OpenFileDialog();
+			dlg.FileName = DecompilerTextView.CleanUpName(assembly.ShortName) + ".pdb";
+			dlg.Filter = "Portable PDB|*.pdb|All files|*.*";
+			dlg.InitialDirectory = Path.GetDirectoryName(assembly.FileName);
+			if (dlg.ShowDialog() != true) return;
+
+			using (context.TreeView.LockUpdates()) {
+				assembly.PdbFileOverride = dlg.FileName;
+				assembly.AssemblyList.ReloadAssembly(assembly);
+			}
+
+			MainWindow.Instance.SelectNode(MainWindow.Instance.FindNodeByPath(new[] { assembly.FileName }, true));
+			MainWindow.Instance.RefreshDecompiledView();
+		}
+
+		public bool IsEnabled(TextViewContext context) => true;
+
+		public bool IsVisible(TextViewContext context)
+		{
+			return context.SelectedTreeNodes?.Length == 1
+				&& context.SelectedTreeNodes?.FirstOrDefault() is AssemblyTreeNode;
+		}
+	}
+}

ILSpy/ILSpy.csproj

@@ -118,6 +118,7 @@
     <Compile Include="Commands\ManageAssemblyListsCommand.cs" />
     <Compile Include="Commands\Pdb2XmlCommand.cs" />
     <Compile Include="Commands\RemoveAssembliesWithLoadErrors.cs" />
+    <Compile Include="Commands\SelectPdbContextMenuEntry.cs" />
     <Compile Include="Commands\ShowCFGContextMenuEntry.cs" />
     <Compile Include="Commands\ShowDebugSteps.cs" />
     <Compile Include="Commands\SortAssemblyListCommand.cs" />

ILSpy/LoadedAssembly.cs

@@ -143,6 +143,8 @@ namespace ICSharpCode.ILSpy
 
 		public bool IsAutoLoaded { get; set; }
 
+		public string PdbFileOverride { get; set; }
+
 		PEFile LoadAssembly(object state)
 		{
 			MetadataReaderOptions options;
@@ -167,7 +169,8 @@ namespace ICSharpCode.ILSpy
 
 			if (DecompilerSettingsPanel.CurrentDecompilerSettings.UseDebugSymbols) {
 				try {
-					debugInfoProvider = DebugInfoUtils.LoadSymbols(module);
+					debugInfoProvider = DebugInfoUtils.FromFile(module, PdbFileOverride)
+						?? DebugInfoUtils.LoadSymbols(module);
 				} catch (IOException) {
 				} catch (UnauthorizedAccessException) {
 				} catch (InvalidOperationException) {