从用户控件退出应用程序 [英] Quit application from a user Control

问题描述

我的应用程序中有一个 MainWindow.MainWindow 在其 ContentControl 中承载一个 UserControl(我称之为 MainPage).MainPage 托管另一个 UserControl，其中包含各种控件 (KiviPage).

I have a MainWindow in my application. The MainWindow hosts a UserControl in its ContentControl(I call this MainPage). MainPage goes onto hosts another UserControl which contains all sorts of controls on it (KiviPage).

我正在尝试连接到 MainPage 中的数据库并在 KiviPage 中加载文件.如果这两个操作中的任何一个失败(连接到数据库或文件加载)，我必须退出应用程序.这意味着我必须从用户控件中退出应用程序.

I am trying to connect to a database in MainPage and load a file in the KiviPage. If any of the two operations fail (connection to database or file loading) I have to quit the application. Which means I have to quit the application from the user controls.

最好的方法是什么?

推荐答案

我认为，您可以通过附加的 DependencyProperty 来实现此操作.类似的东西(这是一个简单的工作示例):

I think, you may implement this action through a attached DependencyProperty. Something like that (it's a simple work example):

XAML

<Window x:Class="ShutdownAppHelp.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:ShutdownAppHelp"
    Title="MainWindow" Height="350" Width="525">

<Window.Resources>
    <Style TargetType="{x:Type CheckBox}">
        <Style.Triggers>
            <Trigger Property="IsChecked" Value="True">
                <Setter Property="local:ProgramBehaviours.Shutdown" Value="True" />
            </Trigger>
        </Style.Triggers>
    </Style>
</Window.Resources>

    <Grid>
        <CheckBox Content=" Shutdown" IsChecked="False" />
    </Grid>
</Window>

背后的代码

namespace ShutdownAppHelp
{    
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
    }

    public static class ProgramBehaviours
    {
        // Shutdown program
        public static void SetShutdown(DependencyObject target, bool value)
        {
            target.SetValue(ShutdownProperty, value);
        }

        public static readonly DependencyProperty ShutdownProperty =
                                                  DependencyProperty.RegisterAttached("Shutdown",
                                                  typeof(bool),
                                                  typeof(ProgramBehaviours),
                                                  new UIPropertyMetadata(false, OnShutdown));

        // Here call function in UIPropertyMetadata()
        private static void OnShutdown(DependencyObject sender, DependencyPropertyChangedEventArgs e)
        {
            if (e.NewValue is bool && ((bool)e.NewValue))
            {
                Application.Current.Shutdown();             
            }
        }
    }
}

您可以在 DependencyProperty 中放置任何类型的行为，它只能通过代码获得，并将其称为 XAML:

You can put any kind of behavior in DependencyProperty, which is available only through the code and call it a XAML:

<DataTrigger Binding="{Binding ElementName=SomeControl, Path=Tag}" Value="Shutdown">
    <Setter Property="local:ProgramBehaviours.Shutdown" Value="True" />
</DataTrigger>

另外，你可以通过行为代码直接访问它:

Also, you can access it directly through the code of behavior:

ProgramBehaviours.SetShutdown(SomeControl, Value);

或从 XAML 无条件:

Or from XAML without condition:

<SomeControl local:ProgramBehaviours.SetShutdown="True" ... />

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