1 using System.Security.Cryptography; 2 using System.Text; 3  4 namespace Common 5 { 6     public class md5Helper 7     { 8         public string GetMd5(string txt) 9         {10             //創建md5對象11             MD5 md5 = MD5.Create();12             //將字符串轉成字節數組13             byte[] bs = Encoding.UTF8.GetBytes(txt);14             //加密15             byte[] bs2 = md5.ComputeHash(bs);16             //將字節數組轉成字符串17             StringBuilder sb = new StringBuilder();18             for (int i = 0; i < bs2.Length; i++)19             {20                 sb.Append(bs2[i].ToString("X2")); //x小寫X大寫21             }22             return sb.ToString();23         }24     }25 }