using System.Security.Cryptography; using System.Text; namespace Common.Helpers { public class Md5 { public static string Encrypt(string str) { string pwd = string.Empty; MD5 md5 = MD5.Create(); // 编码UTF8/Unicode  byte[] s = md5.ComputeHash(Encoding.UTF8.GetBytes(str)); // 转换成字符串 for (int i = 0; i < s.Length; i++) { //格式后的字符是小写的字母 //如果使用大写(X)则格式后的字符是大写字符 pwd = pwd + s[i].ToString("X"); } return pwd; } } }