Question

我有一个MainWindow课程，可以启动“气球”流程。它打开了一个气球开始移动的新窗口。

在我的MainWindow课程中，我希望实时获得baloon启动过程的数量，这就是为什么当我手动关闭Baloon Window时，我希望警告MainWindow类。

以下是我已写的内容：

private void LaunchBaloonProces(object sender, RoutedEventArgs e)
{
if (countBaloonProcess() < 5) {
            Application app = System.Windows.Application.Current;
            ClassLibrary1.Ballon b = new Ballon();
            Thread unThread = new Thread(new ThreadStart(b.Go));
            unThread.Start();
            if (allPaused) unThread.Suspend();
            unThread.Name = "Ballon";
            processList.AddLast(unThread);               

            refreshInformations(); // <= Here's the method Thread child should call
        } 
        else {
            informations.SetValue(TextBox.TextProperty, "Can't create more than 5 baloons");
        }
    }

Answer 1

您可以创建委托并在创建委托时将其传递给子实例。

E.g：

class ChildWindow{
    public ChildWindow(MainWindow.RefreshInformationsDelegate callback){
        //Do work

        //Notify MainWindow that we are closing
        callback();
    }
}

class MainWindow{
    public static delegate void RefreshInformationsDelegate();

    private void LaunchBaloonProces(object sender, RoutedEventArgs e)
    {
        if (countBaloonProcess() < 5) {
            Application app = System.Windows.Application.Current;
            ClassLibrary1.Ballon b = new Ballon(new RefreshInformationsDelegate(refreshInformations));
            Thread unThread = new Thread(new ThreadStart(b.Go));
            unThread.Start();
            if (allPaused) unThread.Suspend();
            unThread.Name = "Ballon";
            processList.AddLast(unThread);
        } 
        else {
            informations.SetValue(TextBox.TextProperty, "Can't create more than 5 baloons");
        }
    }
}

请注意，我将RefreshInformationsDelegate的实例传递给Ballon构造函数。如果您希望在窗口关闭而不是线程完成时发生这种情况，则将回调存储为实例变量，并在callback()事件中使用Form_Closing进行调用。

窗口关闭时的线程回调

1 个答案: