Question

有一个功能，可以打开并显示一个新窗口。我想把一个条件放到那个窗口的闭包上。我在下面写了我想要的伪代码。

private void fnc (object sender, RoutedEventArgs e)
{
    MyWindow nw = new MyWindow();

    nw.Show();

    // Pseudo code: When (nw.Close()) {do something}
}

Answer 1

private void fnc (object sender, RoutedEventArgs e)
{
    MyWindow nw = new MyWindow();

    nw.Show();

    // inline
    nw.Closed += (s1, e1) => Debug.WriteLine("Closed");

    // or
    nw.Closed += (s1, e1) =>
                        {
                            Debug.WriteLine("Closed");

                        };

    // or
    w.Closed += OnWindowClosed;
}

private void OnWindowClosed(object s, EventArgs e)
{
    Debug.WriteLine("Closed");
}

Answer 2

您想使用ShowDialog()。这将使您的代码等到新窗口返回。

private void fnc (object sender, RoutedEventArgs e)
{
    MyWindow nw = new MyWindow();
    nw.ShowDialog();
    //Do something when nw returns
}

或者，如果您不想冻结父窗口，则必须附加到Window.Closed

private void fnc (object sender, RoutedEventArgs e)
{
    MyWindow nw = new MyWindow();
    nw.Closed += nw_Closed;
    nw.Show();
}

private void new_Closed(object sender, CancelEventArgs e)
{
    //Do Something
}

如果您还没有准备好方法，可以使用内联委托使用lambda表达式：

private void fnc (object sender, RoutedEventArgs e)
{
    MyWindow nw = new MyWindow();
    nw.Closed += (sender, cancelEventArgs) => 
        {
           //Do Something
        };
    nw.Show();
}

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2 个答案: