#1999: Add EscapeInvalidIdentifiers flag to allow the use of the EscapeInvalidIdentifiers transform when writing files to disk. We still show the unescaped identifiers in the ILSpy UI.

ILSpy/DecompilationOptions.cs

@@ -37,6 +37,12 @@ namespace ICSharpCode.ILSpy
 		/// Gets/Sets the directory into which the project is saved.
 		/// </summary>
 		public string SaveAsProjectDirectory { get; set; }
+
+		/// <summary>
+		/// Gets/sets whether invalid identifiers should be escaped (and therefore the code be made compilable).
+		/// This setting is ignored in case <see cref="SaveAsProjectDirectory"/> is set.
+		/// </summary>
+		public bool EscapeInvalidIdentifiers { get; set; }
 		
 		/// <summary>
 		/// Gets the cancellation token that is used to abort the decompiler.

ILSpy/Languages/CSharpLanguage.cs

@@ -119,6 +119,9 @@ namespace ICSharpCode.ILSpy
 			decompiler.DebugInfoProvider = module.GetDebugInfoOrNull();
 			while (decompiler.AstTransforms.Count > transformCount)
 				decompiler.AstTransforms.RemoveAt(decompiler.AstTransforms.Count - 1);
+			if (options.EscapeInvalidIdentifiers) {
+				decompiler.AstTransforms.Add(new EscapeInvalidIdentifiers());
+			}
 			return decompiler;
 		}
 
@@ -413,6 +416,9 @@ namespace ICSharpCode.ILSpy
 
 					CSharpDecompiler decompiler = new CSharpDecompiler(typeSystem, options.DecompilerSettings);
 					decompiler.CancellationToken = options.CancellationToken;
+					if (options.EscapeInvalidIdentifiers) {
+						decompiler.AstTransforms.Add(new EscapeInvalidIdentifiers());
+					}
 					SyntaxTree st;
 					if (options.FullDecompilation) {
 						st = decompiler.DecompileWholeModuleAsSingleFile();

ILSpy/TextView/DecompilerTextView.cs

@@ -952,6 +952,7 @@ namespace ICSharpCode.ILSpy.TextView
 			Thread thread = new Thread(new ThreadStart(
 				delegate {
 					try {
+						context.Options.EscapeInvalidIdentifiers = true;
 						Stopwatch stopwatch = new Stopwatch();
 						stopwatch.Start();
 						using (StreamWriter w = new StreamWriter(fileName)) {