Question

我有一个MainWindow页面和一个LoadingWindow。 MainWindow的按钮会自行关闭并打开LoadingWindow。我想要的是当用户关闭“加载”窗口并作为新实例回到MainWindow时。

MainWindow.xaml.cs

   private void Button_Click(object sender, RoutedEventArgs e)
   {
       LoadingWindow load = new LoadingWindow(calibration , "MainWindow" , this);
       Mouse.OverrideCursor = null;
       Application.Current.MainWindow.Close();
       load.ShowDialog();  //  Exception is here the next time it is called
   }

LoadingWindow.xaml.cs

private void Close_Button(object sender, RoutedEventArgs e)
{
     MainWindow main = new MainWindow();
     this.Close();
     main.ShowDialog();
}

现在，当我尝试关闭“加载”窗口并按Button_Click时，load.ShowDialog()会显示以下错误，尽管我正在声明它的新实例。


System.InvalidOperationException: Cannot set Visibility or call Show, ShowDialog, or WindowInteropHelper.EnsureHandle after a Window has closed

我读到您关闭窗口后无法打开窗口，但是我有一个新实例，该实例不会出现此问题。

Answer 1

在主窗口上不要使用Application.Current.MainWindow实例，而应使用this.Close()。

 private void Button_Click(object sender, RoutedEventArgs e)
    {
        LoadingWindow load = new LoadingWindow(...);
        Mouse.OverrideCursor = null;
        //Application.Current.MainWindow.Close();
        this.Close();
        load.ShowDialog();  //  Exception is here the next time it is called
    }

请参阅此thread和this以明确区别。

WPF-从第二个窗口返回第一个窗口

1 个答案: