Adress of thread

Per Jespersen

When I create a thread, I need to give it a method to be executed. Must this method be in a class? I would like to use a method in my main program (which is Form1). Is this possible?

4 Replies

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Per Jespersen14y ago
Ok Thanks. I used the dirty version:

Control.CheckForIllegalCrossThreadCalls = false;

Which I copied from an old VB program. It works and I hope it doen't give any greif later on, in which case, I'll try your suggestion.

thanks again!
0
Vulpes14y ago
Well, you need somewhere to start the thread - say on clicking button1:

private void button1_Click(object sender, EventArgs e)
{
System.Threading.Thread MainThread;
MainThread = new System.Threading.Thread(Method);
MainThread.Start();
}

Notice also that if you're accessing controls (such as textBox1) on a different thread to the one they were created on (the UI thread) then sometimes the code will work and sometimes it won't.

For it to always work, you need to marshal the code which accesses the control back to the UI thread. Here's how you could do it in this particular case :

void Method()
{
this.Invoke((Action)(() =>
{
textBox1.Text = "Written in a thread";
}));
}
0
Per Jespersen14y ago
So how would this be done specifically? like this:

namespace WindowsFormsApplication1
{

    public partial class Form1 : Form
    {

        System.Threading.Thread MainThread;
        MainThread = new Thread(Method);
        MainThread.Start();

        void Method()
        {
            TextBox1.Text = "Written in a thread";
        }

    }

}
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Vulpes14y ago
In C#, all methods must be part of a class or struct - 'global' functions aren't supported.

Form1 is itself just a class (which inherits from Form) so, as long as the method is accessible from where-ever you're creating the thread, there's no reason why you can't use one of its methods for this purpose.
0