FTP upload file prompt 550 error cause analysis.

Test FTP upload file today, the same code from its own demo moved to the formal code, unable to implement the function, and reported

Stream rs = Ftp.getrequeststream () indicates that the remote server returned an error: (550) The file is not available (for example, the file was not found,

Baidu Search Reason:

1. say file permissions;

2. The path is correct;

3. Path is not to add "@"

There are other kinds of statements, one-by-one check not found errors, the key is the same file code, a program can correctly complete the upload, a jump exception.

It suddenly occurred to me that the FTP class hints using System.Linq when copying the code, and namespace errors.

So from then on, using System.Linq; is 3.5 after some, non-demo program is from 2.0 turn over, in the attribute inside into 4.0, referring to using System.Linq;

Everything's fine.

FTP upload file prompt 550 error cause analysis.