Run Winform from other thread

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Hi,

I have static thread which open new alert window form like below.

C#

public static void ThreadWinForm()
{
    Alert_Window aw = new Alert_Window(); // Alert_Window is winform
    aw.Show();
}

Alert Window is winform created in main application form.

Whenerver I run above thread. Alert window winform open. But hanged. Why?
Is it due to I have created winform instance from different thread. I have even used below method. But no luck.

C#

public static void ThreadWinForm()
{
    Alert_Window aw = new Alert_Window();
    if (aw.InvokeRequired) aw.Invoke((MethodInvoker)delegate()
    {
        aw.Show();
    });
    else
    {
        aw.Show();
    }
}

what is right way to do this?

Posted 11-Aug-14 1:07am

Nilesh bhope

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Ziee-M 11-Aug-14 7:32am

Hi, i am a little confused about this case, since the Alert_Window is created within the thread, using delegate shoulden't be a must.

Here is how i do it using anonymous method, try it just to be sure if the issue is related to the item appertencance.

Alert_Window aw = new Alert_Window();
aw.Invoke((MethodInvoker)delegate
{
aw.Show();
});

if this don't work, then your issue has nothing to do with item appartencance.

Waiting for your response !

Nilesh bhope 12-Aug-14 12:05pm

Solution given by lukeer is working.

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lukeer · Accepted Answer · 2014-08-11T01:34:00

You have to ask some UI-Thread element whether or not invoking is required, and let it do the invoking.
That's because you created Alert_Window on another thread. MSDN explains

[Control.Invoke] gets a value indicating whether the caller must call an invoke method when making method calls to the control because the caller is on a different thread than the one the control was created on.

Change your code to something like

public static void ThreadWinForm()
{
    Alert_Window aw = new Alert_Window();
    if (Form1.InvokeRequired) Form1.Invoke((MethodInvoker)delegate()
    {
        aw.Show();
    });
    else
    {
        aw.Show();
    }
}

With "Form1" being any control that you know lives in the UI thread.