c# 计算字符串和文件的MD5值的方法

 

Step1：引入库

 using System.Security.Cryptography;

 using System.IO;

Step2: 计算字符串的Md5值 

         static public string GetMD5WithString(string sDataIn)

         {

             string str = "";

             byte[] data = Encoding.GetEncoding("utf-8").GetBytes(str);

             MD5 md5 = new MD5CryptoServiceProvider();

             byte[] bytes = md5.ComputeHash(data);

             for (int i = ; i < bytes.Length; i++)

             {

                 str += bytes[i].ToString("x2");

             }

             return str;

         }

Step3：计算文件的Md5值

         static public string GetMD5WithFilePath(string filePath)

         {

             FileStream file = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read);

             MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();

             byte[] hash_byte = md5.ComputeHash(file);

             string str = System.BitConverter.ToString(hash_byte);

             str = str.Replace("-", "");

             return str;

         }