Mousedown 事件触发两次 (WPF)
我目前正在尝试从简单网格上的图像捕获鼠标按下。我对事件触发没有任何问题，只是它触发了两次。而且由于单击两次最终会出现不同的状态（它将显示展开的图像），因此直接单击第二次会导致问题。
我当前的代码如下：
XAML
<Window x:Class="WpfApplication.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Grid Background="Transparent" x:Name="MainContent" MouseDown="Generic_MouseDown">
<Image Source="http://www.blogcdn.com/www.engadget.com/media/2011/05/welcome-kansas-city-google-high-speed-internet.jpg" Height="100" Width="100" MouseDown="Generic_MouseDown"/>
</Grid>
</Window>
代码：
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
private void Generic_MouseDown(object sender, MouseButtonEventArgs e)
{
if (((FrameworkElement)e.Source).GetType() == typeof(System.Windows.Controls.Image))
{
Console.Out.WriteLine("image clicked");
}
else
{
Console.Out.WriteLine("grid clicked");
}
}
}
因此，当我单击图像时，它会触发 mousedown 两次。
谢谢！
I am currently trying to capture a mousedown from an image on a simple grid. I have no problems with the event firing, it is just that it fires twice. And because clicking it twice will eventually have a different state (it will show an expanded image), going straight to second click is causing problems.
My current code is as follows:
XAML
<Window x:Class="WpfApplication.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Grid Background="Transparent" x:Name="MainContent" MouseDown="Generic_MouseDown">
<Image Source="http://www.blogcdn.com/www.engadget.com/media/2011/05/welcome-kansas-city-google-high-speed-internet.jpg" Height="100" Width="100" MouseDown="Generic_MouseDown"/>
</Grid>
</Window>
Code:
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
private void Generic_MouseDown(object sender, MouseButtonEventArgs e)
{
if (((FrameworkElement)e.Source).GetType() == typeof(System.Windows.Controls.Image))
{
Console.Out.WriteLine("image clicked");
}
else
{
Console.Out.WriteLine("grid clicked");
}
}
}
So when I click the image, it fires mousedown twice.
Thanks!
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评论（3）
您需要将 Handled 属性设置为 true。
You need to set the Handled property to true.
您需要将 e.Handled 设置为 true 以防止事件从图像冒泡到网格。
实际上，发生的情况是在图像上引发事件，然后如果未处理该事件，则会在网格上引发事件，依此类推，在可视化树上引发。
You would need to set e.Handled to true to prevent the event from bubbling up from the Image to the Grid.
Effectively, what is happening is the event is raised on the Image, then if it's not handled it is raised on the Grid, and so on up the visual tree.
这是您的 XAML 和您将 [ MouseDown="Generic_MouseDown" ] 两次 添加到 Grid &图像
使其像 ONE [ MouseDown="Generic_MouseDown" ] 在 网格 中
OR
使其像 ONE [ 图像中的 MouseDown="Generic_MouseDown" ]
This is your XAML & you added [ MouseDown="Generic_MouseDown" ] Twice to Grid & Image
Make It Like that ONE [ MouseDown="Generic_MouseDown" ] in Grid
OR
Make It Like that ONE [ MouseDown="Generic_MouseDown" ] in Image