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[ASP.net教程]C# 获取文件MD5值的方法


可用于对比文件是否相同

 

 1 /// <summary> 2     /// 获取文件MD5值 3     /// </summary> 4     /// <param name="fileName">文件绝对路径</param> 5     /// <returns>MD5值</returns> 6     public static string GetMD5HashFromFile(string fileName) 7     { 8       try 9       {10         FileStream file = new FileStream(fileName, FileMode.Open);11         System.Security.Cryptography.MD5 md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();12         byte[] retVal = md5.ComputeHash(file);13         file.Close();14 15         StringBuilder sb = new StringBuilder();16         for (int i = 0; i < retVal.Length; i++)17         {18           sb.Append(retVal[i].ToString("x2"));19         }20         return sb.ToString();21       }22       catch (Exception ex)23       {24         throw new Exception("GetMD5HashFromFile() fail,error:" + ex.Message);25       }26     }