获取文件Hash值，用于比较文件是否一致

//获取本地文件Hash值

protected string CheckLocalFileHash(string LocalFilePath)

{

SHA1CryptoServiceProvider sha1 = new SHA1CryptoServiceProvider();

byte[] hash;

using (FileStream fs = new FileStream(LocalFilePath, FileMode.Open, FileAccess.Read, FileShare.Read, 4096))

hash = sha1.ComputeHash(fs);

return BitConverter.ToString(hash);

}