StreamWriter引发IOException登录失败：用户名未知或密码错误

Question

I'm trying to have my web service write to a shared drive on our intranet. I'm getting an IOException on my StreamWriter

 string fullpath = path + "\\" + fileName;
 using (System.IO.StreamWriter file = new System.IO.StreamWriter(fullpath, append))
 {           
     file.WriteLine(contents);
     file.Close();
 }

And the exception I'm seeing,

IOException - Logon failure: unknown user name or bad password 

If I'm understanding correctly, the user of the IIS web server needs to have access to write to the shared drive. I'm wondering if there's a way I can hard-code credentials for now, to write to the shared drive for debugging purposes. How can I provide credentials to a StreamWriter, or is there another mechanism I should be using?

I looked into Impersonation ( using StreamWriter on server in C# ) and would like to use that as a last resort if possible.

Answer 1

Whenever you write to a network drive programmatically, you use the username and password that you used to start the program with. Unless you are using a domain, this will generate an error because the network drive does not recognize your username and password.

So to fix this, all you need to do is run the same code you have as a different user. This is basically the impersonation stuff you wanted to avoid, but I found a useful Stack Overflow Thread that explains this and has links to wrapper classes you can use in your code to make things simpler.

As Simple as this (from thread ):

using (Impersonation.LogonUser(domain, username, password, logonType))
{
        // do whatever you want as this user.
}

This should resolve your issue