获取文件的MD5码（C#）

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using
System;

using
System.IO;

using
System.Security.Cryptography;

using
System.Text;

namespace
Test

{

    public
class MD5Code

    {

        /// <summary>

        /// 获取文件的MD5码

        /// </summary>

        /// <param name="fileName">传入的文件名（含路径及后缀名）</param>

        /// <returns></returns>

        public
string GetMD5HashFromFile(string
fileName)

        {

            try

            {

                FileStream file = new
FileStream(fileName, System.IO.FileMode.Open);

                MD5 md5 = new
MD5CryptoServiceProvider();

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

                file.Close();

                StringBuilder sb = new
StringBuilder();

                for
(int
i = 0; i < retVal.Length; i++)

                {

                    sb.Append(retVal[i].ToString("x2"));

                }

                return
sb.ToString();

            }

            catch
(Exception ex)

            {

                throw
new Exception("GetMD5HashFromFile() fail,error:"
+ ex.Message);

            }

        }

    }

}