从main访问void中的变量

Question

My Form1_Load:

private void Form1_Load(object sender, EventArgs e)
{
    Thread Usern = new Thread(new ThreadStart(Username));
    Usern.Start();
}

And my Username function:

public static void Username()
{
    try
    {
        string user = Environment.UserName;
        MessageBox.Show(user.ToString());
    }
    catch(Exception exc)
    { 
        MessageBox.Show(exc.Tostring()); 
    }
}

Anyone know how I would call "user" used in the function above ^ inside of Form_Load event? I've tried changing the function return type to string but it says it's an invalid change. I know that I could just copy and paste the code from the function into form_load event but it has to be in the function.

Thank you guys in advance and sorry for such a "stupid question" as I didn't find anything related of my problem on SO.

Answer 1

You should probably make user an instance variable instead of a local variable - in other words, declare it in your class:

private string user;

then in Username() (which should be renamed to DetectUserName or something similar) you would just have:

user = Environment.UserName;

Your method should be an instance method though, so that it's associated with an instance of the class - remove the static keyword from the method declaration.

It's not at all clear why you want to do this in a different thread though...