1. Reflector -> Search Type (String)
2.String.format() double click, you will see the code of the method by the reflector.
Download Reflector from:
http://reflector.red-gate.com/download.aspx?TreatAsUpdate=1
.Net系统学习:
http://www.360doc.com/content/10/0524/16/1090703_29285884.shtml
做个快乐的自己。