c# – 如何在非模态对话框的顶部正确实现模态对话框？

发布时间：2020-12-15 08:16:17 所属栏目：百科来源：网络整理

导读：在 WPF应用程序中,我想实现以下似乎不能直接起作用的行为：从主窗口(Window1),用户打开非模态窗口(Window2),并且该非模态窗口可以显示模态对话框(Window3). 问题是,只要显示模态对话框,当用户关闭对话框时,主窗口就会在后台消失(假设有其他应用程序的窗口打

在 WPF应用程序中,我想实现以下似乎不能直接起作用的行为：

从主窗口(Window1),用户打开非模态窗口(Window2),并且该非模态窗口可以显示模态对话框(Window3).

问题是,只要显示模态对话框,当用户关闭对话框时,主窗口就会在后台消失(假设有其他应用程序的窗口打开).

我使用Window.Owner和Window.Show()/ Window.ShowDialog()的方式有什么不对,它是一个bug还是它不支持的东西？

以下简单的WPF应用程序演示了此行为：

public partial class Window1 : Window
{
    public Window1()
    {
        InitializeComponent();
    }

    private void Button_Click(object sender,RoutedEventArgs e)
    {
        Window2 win = new Window2();
        win.Owner = this;
        win.Show();
    }
}

public partial class Window2 : Window
{
    public Window2()
    {
        InitializeComponent();
    }

    private void Button_Click(object sender,RoutedEventArgs e)
    {
        Window3 win = new Window3();
        win.Owner = this;
        win.ShowDialog();
    }

    private void btnClose_Click(object sender,RoutedEventArgs e)
    {
        this.Close();
    }
}

public partial class Window3 : Window
{
    public Window3()
    {
        InitializeComponent();
    }

    private void btnClose_Click(object sender,RoutedEventArgs e)
    {
        this.Close();
    }
}

XAML Window1：

<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1">

    <Button Click="Button_Click">Show non-modal window</Button>
</Window>

XAML Window2：

<Window x:Class="WpfApplication1.Window2"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window2">
    <StackPanel>
        <Button Click="Button_Click">Show modal dialog</Button>
        <Button Name="btnClose" Click="btnClose_Click">Close</Button>
    </StackPanel>
</Window>

XAML Window3：

<Window x:Class="WpfApplication1.Window3"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window3">

    <Button Name="btnClose" Click="btnClose_Click">Close</Button>
</Window>

更新：修复了代码中的复制和粘贴错误.这是.NET 3.5 SP1,如果它很重要.

解决方法

WPF中的Microsoft confirms this as a bug：

This isn’t a regression from previous releases so it doesn’t make the bar to be fixed for this version of the product. We’ll look into this for a future release.

In the meantime,this can be worked around by activating the owner window when the child window is closing.

Sample code:

public partial class Window1 : Window
{
    public Window1()
    {
        InitializeComponent();
    }

    private void NonModalButtonClick(object sender,RoutedEventArgs e)
    {
        new Window1 { Owner = this }.Show();
    }

    private void ModalButtonClick(object sender,RoutedEventArgs e)
    {
        new Window1 { Owner = this }.ShowDialog();
    }

    protected override void OnClosing(System.ComponentModel.CancelEventArgs e)
    {
        if (this.Owner != null)
        {
            this.Owner.Activate();
        }
    }
}

(请注意,解决方法将始终将主窗口置于前景中,这可能与预期的行为不同)

（编辑：李大同）

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