Question

I have a class that I created and in the class I do some multi-threading. Usually to do my multi-threading on a form I would use the following method…

//Thread Safe Functions
delegate void Thread_Safe_SendMessage_Progress_Callback(string sProgress);
private void Thread_Safe_SendMessage_Progress(string sProgress)
{
    if (this.InvokeRequired)
    {
        Thread_Safe_SendMessage_Progress_Callback d =
            new Thread_Safe_SendMessage_Progress_Callback(Thread_Safe_SendMessage_Progress);
        try
        {
            this.Invoke(d, new object[] { sProgress });
        }
        catch
        {
            //ObjectDisposedException
        }
    }
    else
    {
        //Fire up the thread event
        SendMessageThread_Progress(sProgress);
    }
}

Now that works perfect! At this point I try to bring the multi-threading into a class i made. When I do that everything seems to be great with the exception of the InvokeRequired property and the Invoke method do not exist within my class. So using this.InvokeRequired throws an error… To give my class that property I do this… (Note that m_iThreadID is set in the constructor and when the thread is created to start with)

private bool InvokeRequired
{
    get
    {
        //Get the current thread id
        int iThreadID = System.Threading.Thread.CurrentThread.ManagedThreadId;

        //Compare and return results
        return (iThreadID != m_iThreadID);
    }
}

Now the only thing left is the Invoke method… How do I get that to work?

Answer 1

Invoke method isn’t so “easy” to replicate (side question: why don’t you use BeginInvoke? I guess you may don’t need to raise the event synchronously). You can get the first form in Application.OpenForms (copy before use!) and inspect that to check for InvokeRequired and BeginInvoke/Invoke.