获取文件hash值

public string getFilesMD5Hash(string file)         {             //MD5 hash provider for computing the hash of the file             MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();

            //open the file             FileStream stream = new FileStream(file, FileMode.Open, FileAccess.Read, FileShare.Read, 8192);

            //calculate the files hash             md5.ComputeHash(stream);

            //close our stream             stream.Close();

            //byte array of files hash             byte[] hash = md5.Hash;

            //string builder to hold the results             StringBuilder sb = new StringBuilder();

            //loop through each byte in the byte array             foreach (byte b in hash)             {                 //format each byte into the proper value and append                 //current value to return value                 sb.Append(string.Format("{0:X2}", b));             }

            //return the MD5 hash of the file             return sb.ToString();         }