BeginInvoke澄清

Question

所以我研究了beginInvoke从另一个线程调用一个方法。 （如果我错了，请纠正我）

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
    while (true)
    {
        this.BeginInvoke((Action)(() =>
        {
            red_light1 = comport.message(4, 8, 32); 
            if (red_light1 == "1") 
            {
                ellipse1.FillEllipse(red_on, 250, 133, 24, 24);
            }
            else
            { 
                ellipse1.FillEllipse(red_off, 250, 133, 24, 24);
                }));
                Thread.Sleep(300);
            }
        }
    }
}

但是我想在这个“动作”中读取另外5个值，我不知道如何调用它。

如何实现一个方法，在我的代码中调用6个变量，然后调用它。

 method implementation
{

//no parameters & no return value, just read and store the values in variables like "red_light1" and after color some ellipses depending on values (1|0).

}

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
    while (true)
    {
        this.BeginInvoke( **method call** );
        Thread.Sleep(300);
    }
}

Answer 1

你正在做的事情毫无意义。

你似乎正在使用BackgroundWorker，它通常用于执行繁重的操作（在从ThreadPool获得的后台线程上），然后你在后台线程上没有做任何重的事情

事实上，你根本没有做任何事情：

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
    // a loop that never exits !!!!
    // no break, no cancel, nothing!!!
    while (true) 
    {
        // here is the Background thread
        //... and absolutely NOTHING happens here...

        // the code that follows gets invoked on the UI thread
        // (which defeats the purpose of the BackgroundWorker...)
        // then immediately returns (because it's asynchronous)
        // to be invoked again
        // and again, and again...
        // (Is your app unresponsive perhaps? doesn't it hang?)
        this.BeginInvoke((Action)(() =>
        {
            red_light1 = comport.message(4, 8, 32); 
            if (red_light1 == "1") 
            {
                ellipse1.FillEllipse(red_on, 250, 133, 24, 24);
            }
            else
            { 
                ellipse1.FillEllipse(red_off, 250, 133, 24, 24);
                }));

                // Your UI hangs here !!!
                // (Because you're putting your UI thread to sleep!)
                // At least call Thread.Sleep() in the background thread.
                // Or call synchronous Invoke() instead of asynchronous BeginInvoke()
                // so your background thread waits untill the operation on UI thread
                // is completed before trying to perform it again
                Thread.Sleep(300);
            }
        }
    }
}