看看：http://mvolo.com/blogs/serverside/archive/2007/01/11/Display-$p$ptty-file-icons-in-your-ASP.NET-applications-with-IconHandler.aspx

这不是最干净的解决方案，但它的工作原理。否则，试图让你的手的图标即是基于MIME类型或文件扩展名的库。

It's not the cleanest solution but it works. Otherwise, try to get your hands on a library of Icons that's based on mime type or file extension.