C# 計算文件MD5值

 
public static string GetMd5Hash(string pathName)
{
    string strResult = "";
    string strHashData = "";
    byte[] arrbytHashValue;


System.IO.FileStream oFileStream = null;

System.Security.Cryptography.MD5CryptoServiceProvider oMD5Hasher = new System.Security.Cryptography.MD5CryptoServiceProvider();

try
{
    oFileStream = new System.IO.FileStream(pathName.Replace("\\"", ""), System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.ReadWrite);

    arrbytHashValue = oMD5Hasher.ComputeHash(oFileStream); //計算指定Stream 對象的哈希值

    oFileStream.Close();

    //由以連字符分隔的十六進制對構成的String，其中每一對表示value 中對應的元素；例如“F-2C-4A”

    strHashData = System.BitConverter.ToString(arrbytHashValue);

    //替換-
    strHashData = strHashData.Replace("-", "");

    strResult = strHashData;
}

catch (System.Exception ex)
{
    Console.WriteLine(ex.Message);
}
return strResult;

}
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