如何从用户控件里面关闭一个窗口？

Question

我有一个WPF程序，并在某些时候我打开了一扇窗：

public object testCommand() 
    { 
     Window window = new Window 
     { 
      Title = "My User Control Dialog", 
      Content = new OKMessageBox("Error Message"), 
      SizeToContent = SizeToContent.WidthAndHeight, 
      ResizeMode = ResizeMode.NoResize 
     }; 
     window.WindowStartupLocation = WindowStartupLocation.CenterScreen; 
     window.ShowDialog(); 

     return null; 
    } 

用户控制XAML：

<UserControl x:Class="SolidX.Base.MessageBoxes.OKMessageBox" 
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
      xmlns:local="clr-namespace:SolidX.Base.MessageBoxes" 
      xmlns:viewProperties="clr-namespace:AppResources.Properties;assembly=AppResources" 
      mc:Ignorable="d" 
      d:DesignHeight="150" d:DesignWidth="400"> 
    <Grid> 
     <TextBlock x:Name="textMessage" Margin="10"/> 
     <Grid Height="Auto" VerticalAlignment="Bottom"> 
      <Grid.RowDefinitions> 
       <RowDefinition/> 
       <RowDefinition/> 
      </Grid.RowDefinitions> 
      <CheckBox Content="Don't show this again" HorizontalAlignment="Right" Margin="5,5,10,5"/> 
      <StackPanel Grid.Row="1" Orientation="Horizontal" HorizontalAlignment="Right"> 
       <Button x:Name="btnOk" Content="{x:Static viewProperties:Resources.Common_OK}" Height="25" VerticalAlignment="Center" Width="90" Margin="5"/> 
      </StackPanel> 
     </Grid> 
    </Grid> 
</UserControl> 

用户控件的代码隐藏：

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; 

namespace SolidX.Base.MessageBoxes 
{ 
    /// <summary> 
    /// Interaction logic for OKMessageBox.xaml 
    /// </summary> 
    public partial class OKMessageBox : UserControl 
    { 
     public OKMessageBox(string Message) 
     { 
      InitializeComponent(); 
      textMessage.Text= Message; 
     } 
    } 
} 

而且在我的用户控件中，我试图让按钮关闭窗口（目前，设置Button.IsCancel = true;的作品，但我希望这是一个可重用的选项 - 基本上使我自己的this.Close;）。

我想这在代码隐藏我的用户，但无济于事（由其他几个StackOverflow的答案建议）（parentWindow总是空）：

var parentWindow = Window.GetWindow(this); 
parentWindow.Close(); 

Answer 1

在用户控件试试这个：

XAML

<UserControl .... Loaded="UserControl_Loaded"> 
    <!-- --> 
</UserControl> 

CS

public UserControl() 
{ 
    InitializeComponent(); 
} 

private void UserControl_Loaded(object sender, RoutedEventArgs e) 
{ 
    var window = Window.GetWindow(this); 
    window.Close(); 
} 

Answer 2

如果您正在使用ViewModel类对于您的Window，您可以将ViewModel类设置为您的Window实例，并且ViewModel可以存储它的所有者。

例如视图模型：

public class CloseConfirmViewModel 
{ 
    internal Window Owner { get; set; } 

    public ICommand CloseCommand { get; private set; } // ICommand to bind it to a Button 

    public CloseConfirmViewModel() 
    { 
     CloseCommand = new RelayCommand<object>(Close); 
    } 

    public void Close() // You can make it public in order to call it from codebehind 
    { 
     if (Owner == null) 
      return; 

     Owner.Close(); 
    } 
} 

为了得到它的工作，你必须在ViewModel类设置为您Window：

public partial class CloseConfirmWindow : Window 
{ 
    public CloseConfirmWindow(CloseConfirmViewModel model) 
    { 
     DataContext = model; 

     InitializeComponent(); 

     model.Owner = this; 
    } 
} 

并且要创建一个新的实例这样：

var model = new CloseConfirmViewModel(); 
var closeWindow = new CloseConfirmWindow(model); 
closeWindow.ShowDialog(); // Hopefully you've added a button which has the ICommand binded 

您可以将Window的CloseCommand到UserControl的按钮，或者如果您不使用命令，请在单击UC按钮时调用Close()方法。

Answer 3

要关闭模态对话框，你应该设置DialogResult:DialogResult = false;