看了很久，相信很多人也看过了。
Rotor Source
虽然不能保证和运行的版本一致，但是能看到这样的文件头。
再加上反编译工具，那就无敌了。
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// <copyright file="CSharpCodeProvider.cs" company="Microsoft">
//
// Copyright (c) 2002 Microsoft Corporation. All rights reserved.
//
// The use and distribution terms for this software are contained in the file
// named license.txt, which can be found in the root of this distribution.
// By using this software in any fashion, you are agreeing to be bound by the
// terms of this license.
//
// You must not remove this notice, or any other, from this software.
//
// </copyright>
//------------------------------------------------------------------------------
