Question

试图做的是,在目前形式的某种位置上取得一种颜色。但是,我称之为这一方法的时机已经成熟。当我提出申请时,我有了一个错误:

Cross-thread operation not valid: Control Form1 accessed from a thread other than the thread it was created on.

阅读法:

Thread drawThread;
drawThread = new Thread(drawBikes);

《刑法》:

public void drawBikes()
{
    MessageBox.Show("Bike "+bike.color.ToString()+": "+Form1.ActiveForm.GetPixelColor(bike.location.X, bike.location.Y).ToString());
}

这里是“GetPixelColor”方法(在一个单独的固定类别中):

public static class ControlExts
{
    public static Color GetPixelColor(this Control c, int x, int y)
    {
        var screenCoords = c.PointToScreen(new Point(x, y));
        return Win32.GetPixelColor(screenCoords.X, screenCoords.Y);
    }
}

我在什么地方叫Invoke?

Answer 1

你们需要把Invoke从正在与德国金融情报局互动的任何其他深层中叫出来。就你而言,“Bikes”(Peoples)正在试图更新国际律师联合会。引证:

    public void drawBikes()
    {
        if (InvokeRequired)
        {
            this.Invoke(new MethodInvoker(drawBikes));
            return;
        }
        // code below will always be on the UI thread
        MessageBox.Show("Bike "+bike.color.ToString()+": "+Form1.ActiveForm.GetPixelColor(bike.location.X, bike.location.Y).ToString());

    }

Answer 2

http://msdn.microsoft.com/en-us/library/system.windows.forms. Control.begininvoke.aspx”rel=“nofollow”

类似于

            public static class ControlExts
            {
                      public static Color GetPixelColor(this Control c, int x, int y)
                      {
                         this.BeginInvoke(new Action(() =>
                          {
                          var screenCoords = c.PointToScreen(new Point(x,y));
                          return Win32.GetPixelColor(screenCoords.X, screenCoords.Y);
                         }));

                       }
           }

友情链接