不用添加任何包,只需一个代码即可
string pwd = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, "MD5").ToLower();
注意转化大小写,默认小写
string password = pwd.ToUpper(); //转换为大写
C#.NET 加密解密:AES/DES/Base64/RSA/MD5/SHA256
http://www.cnblogs.com/livexy/archive/2010/07/05/1771285.html
转载出处:http://yuelangyc.iteye.com/blog/967298