MD5文件去重

//计算文件的MD5码

private string getMD5Hash(string pathName)

{

string strResult = "";

string strHashData = "";

byte[] arrbytHashValue;

System.IO.FileStream oFileStream = null;

System.Security.Cryptography.MD5CryptoServiceProvideroMD5Hasher =

newSystem.Security.Cryptography.MD5CryptoServiceProvider();

try

{

oFileStream = new System.IO.FileStream(pathName, System.IO.FileMode.Open,

System.IO.FileAccess.Read, System.IO.FileShare.ReadWrite));

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

oFileStream.Close();

//由以连字符分隔的十六进制对构成的String，其中每一对表示value 中对应的元素；例如“F-2C-4A”

strHashData = System.BitConverter.ToString(arrbytHashValue);

//替换-

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

strResult = strHashData;

}

catch (System.Exception ex)

{

MessageBox.Show(ex.Message);

}

return strResult;

}