From f0bfded6cb7c7efc9046527e589a45c346c1222a Mon Sep 17 00:00:00 2001
From: Daniel Grunwald <daniel@danielgrunwald.de>
Date: Sat, 17 Sep 2011 16:18:38 +0200
Subject: [PATCH] C# AST: when setting a string property to null or an empty
 string, remove the corresponding identifier token.

---
 ICSharpCode.NRefactory.CSharp/Ast/Identifier.cs | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/ICSharpCode.NRefactory.CSharp/Ast/Identifier.cs b/ICSharpCode.NRefactory.CSharp/Ast/Identifier.cs
index 0938d9f0c3..3c692706d1 100644
--- a/ICSharpCode.NRefactory.CSharp/Ast/Identifier.cs
+++ b/ICSharpCode.NRefactory.CSharp/Ast/Identifier.cs
@@ -113,17 +113,18 @@ namespace ICSharpCode.NRefactory.CSharp
 
 		public static Identifier Create (string name, TextLocation location)
 		{
-			if (name == null)
-				throw new ArgumentNullException("name");
-			if (name.Length > 0 && name[0] == '@')
+			if (string.IsNullOrEmpty(name))
+				return Identifier.Null;
+			if (name[0] == '@')
 				return new VerbatimIdentifier(name.Substring (1), location);
-			return new Identifier (name, location);
+			else
+				return new Identifier (name, location);
 		}
 		
 		public static Identifier Create (string name, TextLocation location, bool isVerbatim)
 		{
-			if (name == null)
-				throw new ArgumentNullException("name");
+			if (string.IsNullOrEmpty(name))
+				return Identifier.Null;
 			
 			if (isVerbatim)
 				return new VerbatimIdentifier(name, location);