WPF中的事件处理

问题描述

窗口中有一个按钮 btn_Edit 。当该按钮点击时，将打开一个新窗口（ new_win ），并将点击事件添加到按钮（ btn_OK ）在 new_win 上。似乎 btn_OK_Click 不起作用，因为 new_win 不会关闭。问题在哪里？

  BC_edit new_win = new BC_edit（）; 
 
 private void btn_Edit_Click（object sender，RoutedEventArgs e）
 {
 new_win.Title =a_title; 
 new_win.ShowDialog（）; 
 
 new_win.btn_OK.Click + = new RoutedEventHandler（btn_OK_Click）; 
} 
 
 private void btn_OK_Click（object sender，RoutedEventArgs e）
 {
 _MyCollection.Add（new MyData 
 {
 Boundary = new_win .Title，
 Type = new_win.cmb_BC_edit_type.SelectedItem.ToString（），
 Option = new_win.cmb_BC_edit_options.SelectedItem.ToString（）
}）; 
 
 new_win.Close（）; 
} 
  

解决方案

您需要订阅 ）;
new_win.ShowDialog（）;

请记住， ShowDialog 方法是阻止：它将不会返回，直到窗口关闭，所以以下语句将不会执行，直到那时。

There is a button btn_Edit in a window. When that button clicked, a new window opens (new_win) and a click event is added to a button (btn_OK) on new_win. It seems that btn_OK_Click does not work because new_win does not close. Where is the problem?

    BC_edit new_win = new BC_edit();

    private void btn_Edit_Click(object sender, RoutedEventArgs e)
    {
        new_win.Title = "a_title";
        new_win.ShowDialog();

        new_win.btn_OK.Click += new RoutedEventHandler(btn_OK_Click);
    }

    private void btn_OK_Click(object sender, RoutedEventArgs e)
    {
        _MyCollection.Add(new MyData
        {
            Boundary = new_win.Title,
            Type = new_win.cmb_BC_edit_type.SelectedItem.ToString(),
            Option = new_win.cmb_BC_edit_options.SelectedItem.ToString()
        });

        new_win.Close();
    }

解决方案

You need to subscribe to the event before you show the new window:

    new_win.btn_OK.Click += new RoutedEventHandler(btn_OK_Click);
    new_win.ShowDialog();

Remember that the ShowDialog method is blocking: it won't return until the window is closed, so the following statements won't be executed until then.

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