[英]How do I subscribe to context menu closing event in WPF?
我尝试了各种解决方案,例如在这里找到的解决方案,该解决方案具有以下公认的答案:
<Button ContextMenuClosing="ContextMenu_ContextMenuClosing">
<Button.ContextMenu>
<ContextMenu>
<MenuItem Header="Go"/>
</ContextMenu>
</Button.ContextMenu>
</Button>
但是,实现上述解决方案后,无论如何关闭,我仍然无法成功监听ContextMenuClosing事件(进行选择,单击父按钮,单击菜单或按钮的任意位置)。 以下是我的代码,我在做什么错?
TestPage.xaml
<Page x:Class="MyProject.pages.TestPage"
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:MIMOUI.pages"
mc:Ignorable="d"
d:DesignHeight="300"
d:DesignWidth="300"
Title="TestPage">
<Grid>
<Button x:Name="myMenuButton"
Width="140"
Height="100"
Click="myMenuButton_Click"
ContextMenuClosing="myMenuButton_ContextMenuClosing"
Background="NavajoWhite"
Foreground="BurlyWood">
<Button.ContextMenu>
<ContextMenu x:Name="myMenuButton_ContextMenu" Width="250">
<MenuItem x:Name="myTaskMenuButton" Header="TASKS" />
<MenuItem x:Name="myTransactionButton" Header="TRANSACTION" />
<MenuItem x:Name="mySetupMenuButton" Header="SETUP" />
</ContextMenu>
</Button.ContextMenu>
</Button>
</Grid>
</Page>
TestPage.xaml.cs
using System;
using System.Windows;
using System.Windows.Controls;
namespace MyProject.pages {
public partial class TestPage : Page {
public TestPage() {
InitializeComponent();
}
public void myMenuButton_Click(object sender, RoutedEventArgs e) {
(sender as Button).ContextMenu.IsOpen = true;
}
public void myMenuButton_ContextMenuClosing(object sender, RoutedEventArgs e) {
Console.WriteLine("intercepted!!!!");
e.Handled = true;
}
}
}
由于我不知道的原因,当您的Click
代码打开ContextMenuClosing
似乎没有触发它。 如果您要通过右键单击打开ContextMenu
,则将按预期触发事件。 作为一种解决方法,您可以使用ContextMenu.Closed
事件,这两种情况似乎都被调用
<Button x:Name="myMenuButton" Click="myMenuButton_Click" ...>
<Button.ContextMenu>
<ContextMenu ... Closed="myMenuButton_ContextMenu_Closed">
<MenuItem x:Name="myTaskMenuButton" Header="TASKS" />
<MenuItem x:Name="myTransactionButton" Header="TRANSACTION" />
<MenuItem x:Name="mySetupMenuButton" Header="SETUP" />
</ContextMenu>
</Button.ContextMenu>
</Button>
并在您的代码中
private void myMenuButton_ContextMenu_Closed(object sender, RoutedEventArgs e)
{
Debug.WriteLine("myMenuButton_ContextMenu_Closed");
}
唯一的区别似乎是您无法像在ContextMenuClosing
事件中一样能够阻止ContextMenu
关闭
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