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diff --git a/ICSharpCode.Decompiler/Ast/Transforms/IntroduceExtensionMethods.cs b/ICSharpCode.Decompiler/Ast/Transforms/IntroduceExtensionMethods.cs
new file mode 100644
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+++ b/ICSharpCode.Decompiler/Ast/Transforms/IntroduceExtensionMethods.cs
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+// Copyright (c) 2011 AlphaSierraPapa for the SharpDevelop Team
+// 
+// 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;
+using System.Linq;
+using ICSharpCode.NRefactory.CSharp;
+using Mono.Cecil;
+
+namespace ICSharpCode.Decompiler.Ast.Transforms
+{
+	/// <summary>
+	/// Converts extension method calls into infix syntax.
+	/// </summary>
+	public class IntroduceExtensionMethods : IAstTransform
+	{
+		readonly DecompilerContext context;
+		
+		public IntroduceExtensionMethods(DecompilerContext context)
+		{
+			this.context = context;
+		}
+		
+		public void Run(AstNode compilationUnit)
+		{
+			foreach (InvocationExpression invocation in compilationUnit.Descendants.OfType<InvocationExpression>()) {
+				MemberReferenceExpression mre = invocation.Target as MemberReferenceExpression;
+				MethodReference methodReference = invocation.Annotation<MethodReference>();
+				if (mre != null && mre.Target is TypeReferenceExpression && methodReference != null && invocation.Arguments.Any()) {
+					MethodDefinition d = methodReference.Resolve();
+					if (d != null) {
+						foreach (var ca in d.CustomAttributes) {
+							if (ca.AttributeType.Name == "ExtensionAttribute" && ca.AttributeType.Namespace == "System.Runtime.CompilerServices") {
+								var firstArgument = invocation.Arguments.First();
+								if (firstArgument is NullReferenceExpression)
+									firstArgument = firstArgument.ReplaceWith(expr => expr.CastTo(AstBuilder.ConvertType(d.Parameters.First().ParameterType)));
+								else
+									mre.Target = firstArgument.Detach();
+								if (invocation.Arguments.Any()) {
+									// HACK: removing type arguments should be done indepently from whether a method is an extension method,
+									// just by testing whether the arguments can be inferred
+									mre.TypeArguments.Clear();
+								}
+								break;
+							}
+						}
+					}
+				}
+			}
+		}
+	}
+}