COM技术和.NET的关系

The Microsoft .NET Framework consists of a library of classes called the Framework Class  Library (FCL) and a Common Language Runtime (CLR) that provides a managed code execution  environment  with features such as just-in-time compilation, type verification, garbage  collection,  and code access security. By offering these features, the CLR provides a development  environment  that improves programmer productivity and reduces common programming  errors.  For an excellent description of the .NET Framework and its core architecture, see CLR via  C#, Third Edition by Jeffrey Richter (Microsoft Press, 2010).  The CLR is implemented as a classic COM server whose code resides in a standard user- mode  Windows DLL. In fact, all components of the .NET Framework are implemented as standard  user-mode Windows DLLs layered over unmanaged Windows API functions. (None of the  .NET Framework runs in kernel mode.)

Figure 1-1 illustrates the relationship between these components: