该vshost.exe功能是在VS2005（回答您的评论）。介绍

The vshost.exe feature was introduced with VS2005 (to answer your comment).

它的目的主要是使调试启动更快 - 基本上没有，你希望它尽快的已经与框架运行的过程，刚准备装入您的应用程序

The purpose of it is mostly to make debugging launch quicker - basically there's already a process with the framework running, just ready to load your application as soon as you want it to.

请参阅这个MSDN文章并的这个博客帖子了解详情。