Fix #3300: System.FormatException: The input string 'PDB' was not in a correct format.

ICSharpCode.ILSpyX/LoadedAssembly.cs

@@ -299,7 +299,7 @@ namespace ICSharpCode.ILSpyX
 		/// </summary>
 		public bool IsLoadedAsValidAssembly {
 			get {
-				return loadingTask.Status == TaskStatus.RanToCompletion && loadingTask.Result.MetadataFile != null;
+				return loadingTask.Status == TaskStatus.RanToCompletion && loadingTask.Result.MetadataFile is { IsMetadataOnly: false };
 			}
 		}
 

ILSpy/Commands/SaveCodeContextMenuEntry.cs

@@ -18,21 +18,17 @@
 
 using System;
 using System.Collections.Generic;
+using System.ComponentModel.Composition;
 using System.IO;
 using System.Linq;
 using System.Windows;
 
-using ICSharpCode.Decompiler.IL;
-using ICSharpCode.ILSpy.Options;
 using ICSharpCode.ILSpy.Properties;
 using ICSharpCode.ILSpy.TreeNodes;
 using ICSharpCode.ILSpy.ViewModels;
-
-using Microsoft.Win32;
 using ICSharpCode.ILSpyX.TreeView;
-using System.ComponentModel.Composition;
 
-using ICSharpCode.ILSpy.Docking;
+using Microsoft.Win32;
 
 
 namespace ICSharpCode.ILSpy.TextView
@@ -76,7 +72,7 @@ namespace ICSharpCode.ILSpy.TextView
 					if (singleSelection.Save(tabPage))
 						return;
 				}
-				else if (selectedNodes.Count > 1 && selectedNodes.All(n => n is AssemblyTreeNode))
+				else if (selectedNodes.Count > 1 && selectedNodes.All(n => n is AssemblyTreeNode { LoadedAssembly.IsLoadedAsValidAssembly: true }))
 				{
 					var selectedPath = SelectSolutionFile();