我开发了一个示例 WPF 项目。
这是主窗口的代码隐藏:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using Telerik.Windows.Controls;
namespace MainWindowInBackground
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
private void Button_Click(object sender, RoutedEventArgs e)
{
Window l_hostWindow = new Window()
{
Owner = System.Windows.Application.Current.MainWindow,
WindowStartupLocation = WindowStartupLocation.CenterOwner,
Content = "Test"
};
l_hostWindow.Show();
Window l_hostWindow2 = new Window()
{
Owner = System.Windows.Application.Current.MainWindow,
WindowStartupLocation = WindowStartupLocation.CenterOwner,
Content = "Test 2"
};
l_hostWindow2.Show();
l_hostWindow2.Close();
//MessageBox.Show(this, "MessageBox", "MessageBox", MessageBoxButton.OK, MessageBoxImage.Information, MessageBoxResult.OK);
}
}
}
当用户单击按钮时:
我已执行以下操作:
有人可以解释一下为什么主窗口被自动置于后台以及如何避免它吗? 预先感谢您的帮助
无法告诉你为什么它被发送到后台,但让它保持在前台并获得焦点的方法是使其成为子窗口的所有者,并在子窗口关闭时调用父窗口的
Window.Focus()
方法。 ..
public ChildWindow()
{
InitializeComponent();
Owner = Application.Current.MainWindow;
}
private void ChildWindow_OnClosed(object sender, WindowClosedEventArgs e)
{
if (Owner == null) return;
Owner.Focus();
}
在子窗口中设置
Owner
将阻止用户将父窗口带到前台(父窗口可以获得焦点,但子窗口在相交时不会移到父窗口后面)..
如果您想在某个窗口关闭时将主窗口带到前台,您可以在一处完成
private void ChildWindow_OnClosed(object sender, WindowClosedEventArgs e)
{
Application.Current.MainWindow?.Activate(); // Or Focus()
}