计算文件的MD5值

///

/// 计算文件的MD5值
///

///
///
public static String GetStreamMD5(Stream stream)
{
string strResult = "";
string strHashData = "";
byte[] arrbytHashValue;
System.Security.Cryptography.MD5CryptoServiceProvider oMD5Hasher =
new System.Security.Cryptography.MD5CryptoServiceProvider();
arrbytHashValue = oMD5Hasher.ComputeHash(stream); //计算指定Stream 对象的哈希值
//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;
return strResult;
}