相关疑难解决方法(0)

我正试图在Canvas上测试一堆UserControls.我不希望HitTest()在整个可视树中走路,所以我使用FilterCallback来确保我只测试UserControl.

我的问题是UserControl永远不会命中,它应该,但它不会.如果我使用FilterCallback,我会返回它什么都没有.如果我让HitTest运行可视树,它会跳过UserControl.

这是一些代码:

<Canvas x:Name="Container">
<UserControl>
   <Grid>
      <Rectangle />
   </Grid>
</UserControl>
<UserControl>
   <Grid>
      <Rectangle />
   </Grid>
</UserControl>
</Canvas>

...
VisualTreeHelper.HitTest(Container, OnFilter, OnResult, myPoint);
...

private void OnResult(DependencyObject o)
{
   //I'll get the Rectangle here, but never the userControl  
}

private void OnFilter(DependencyObject o)
{
   //I will get the UserControl here, but even when I do nothing more than continue, it will not trigger a visualHit.  But the child rectangle will.
}