From 6034e0841d0a0ae29af89a7f9236612a6d87675c Mon Sep 17 00:00:00 2001
From: Jb Evain <jbevain@gmail.com>
Date: Thu, 19 Jan 2012 23:04:10 +0100
Subject: [PATCH] Add TypeDefinition.GetEnumUnderlyingType extension

---
 ICSharpCode.Decompiler/CecilExtensions.cs | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/ICSharpCode.Decompiler/CecilExtensions.cs b/ICSharpCode.Decompiler/CecilExtensions.cs
index 89377bf55..2c1795137 100644
--- a/ICSharpCode.Decompiler/CecilExtensions.cs
+++ b/ICSharpCode.Decompiler/CecilExtensions.cs
@@ -215,6 +215,23 @@ namespace ICSharpCode.Decompiler
 				return true;
 			return IsCompilerGeneratedOrIsInCompilerGeneratedClass(member.DeclaringType);
 		}
+
+		public static TypeReference GetEnumUnderlyingType(this TypeDefinition type)
+		{
+			if (!type.IsEnum)
+				throw new ArgumentException("Type must be an enum", "type");
+
+			var fields = type.Fields;
+
+			for (int i = 0; i < fields.Count; i++)
+			{
+				var field = fields[i];
+				if (!field.IsStatic)
+					return field.FieldType;
+			}
+
+			throw new NotSupportedException();
+		}
 		
 		public static bool IsAnonymousType(this TypeReference type)
 		{