谁能向我解释为什么在这个简单MouseDown的例子中事件没有达到？ScrollViewer
<Window x:Class="MouseDownTest.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>
<ScrollViewer Name="scrollViewer" Background="Green" MouseDown="ScrollViewer_MouseDown" PreviewMouseDown="ScrollViewer_PreviewMouseDown">
<Canvas Name="canvas" Background="Beige" MouseDown="Canvas_MouseDown" PreviewMouseDown="Canvas_PreviewMouseDown">
</Canvas>
</ScrollViewer>
</Grid>
</Window>
后面的代码：
using System;
using System.Windows;
using System.Windows.Input;
namespace MouseDownTest
{
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
scrollViewer.AddHandler(MouseDownEvent, new RoutedEventHandler(ScrollViewer_Test));
}
private void ScrollViewer_Test(object sender, RoutedEventArgs routedEventArgs)
{
Console.WriteLine("ScrollViewer_Test");
}
private void Canvas_MouseDown(object sender, MouseButtonEventArgs e)
{
Console.WriteLine("Canvas_MouseDown");
}
private void Canvas_PreviewMouseDown(object sender, MouseButtonEventArgs e)
{
Console.WriteLine("Canvas_PreviewMouseDown");
}
private void ScrollViewer_MouseDown(object sender, MouseButtonEventArgs e)
{
Console.WriteLine("ScrollViewer_MouseDown");
}
private void ScrollViewer_PreviewMouseDown(object sender, MouseButtonEventArgs e)
{
Console.WriteLine("ScrollViewer_PreviewMouseDown");
}
}
}
单击画布时的输出是
ScrollViewer_PreviewMouseDown
Canvas_PreviewMouseDown
Canvas_MouseDown
为什么会ScrollViewer_MouseDown被省略？我已经查看了这篇文章，但那里给出的解决方案没有帮助（或者我做错了）。