Question

我有一个带按钮的wpf应用程序，它会打开一个新窗口，我要在其中确定一些设置。请参阅以下代码：

public partial class MainWindow : Window
{
    private SettingsWindow SettingsWindow;

    public MainWindow()
    {
        InitializeComponent();
    }

    private void settings_Click(object sender, RoutedEventArgs e)
    {
        if (this.SettingsWindow == null)
        {
            SettingsWindow = new SettingsWindow(); // No reentrace here !!!
        }
        SettingsWindow.Show();
        SettingsWindow.Focus();
    }
}

但是，当我关闭SettingsWindow并想从MainWindow重新打开它时，整个应用程序将冻结。我认为该对象将在关闭时被破坏，从而在if子句中重新初始化。

我是否必须在SettingsWindow的关闭例程中进行覆盖，还是忽略其他内容？

Answer 1

您将要跟踪SettingsWindow是否已关闭。否则，您将重新显示一个可能已关闭并已废弃的窗口。关闭窗口不会删除您对此的引用。

 public class SettingsWindow : Window
{
    protected override void OnClosed(EventArgs e)
    {
        base.OnClosed(e);
        this.IsClosed = true;
    }

    public bool IsClosed { get; private set; }
}

public partial class MainWindow : Window
{
    private SettingsWindow settingsWindow;
    private void settings_Click(object sender, RoutedEventArgs e)
    {
        if (this.settingsWindow == null || this.settingsWindow.IsClosed) 
        {
            this.settingsWindow = new SettingsWindow();
        }
        this.settingsWindow.Show();
        this.settingsWindow.Focus();
    }

}

如何在wpf中关闭并重新打开窗口？

1 个答案: