FTP上传后计算文件的MD5校验和

Question

I want to perform the checksum MD5 control after the upload of file to FTP(S) server.

What steps should I follow in C#? I think I have to use the XMD5 command on FTPS server and get the result.

But I do not know how to do it.

Thanks

Answer 1

You cannot execute random FTP commands using .NET FtpWebRequest , nor any other built-in .NET class.

You have to use a 3rd party FTP library for this.

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For example WinSCP .NET assembly has Session.CalculateFileChecksum method . The method will automatically map checksum algorithm name (as "md5") to an FTP command that the server supports. So if the server supports XMD5 , it will use XMD5 .

(I'm the author of WinSCP)

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For some background, see also my answer to:
FTP: copy, check integrity and delete