你必须使用
MouseLeftButtonDown 事件和
MouseLeftButtonUp 活动。

you have to use the MouseLeftButtonDown event and the MouseLeftButtonUp event.

<uiElement MouseLeftButtonDown="mouseDownHandler"
                    MouseLeftButtonUp="mouseUpHandler">
</uiElement>

private void mouseDownHandler(object sender, MouseButtonEventArgs e)
{
  // ...
}
private void mouseUpHandler(object sender, MouseButtonEventArgs e)
{
  // ...
}