WPF 是否有鼠标滚轮上下滚动事件
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Does WPF have mouse wheel scrolling up and down event
提问by dongx
I checked msdn. For event related to mouse wheel, there is only one option -- UIElement.MouseWheel
我检查了msdn。对于鼠标滚轮相关的事件，只有一种选择——UIElement.MouseWheel
What I want to do is listening to mouse wheel scrolling forward(up) and backward(down) event.
我想要做的是监听鼠标滚轮向前（向上）和向后（向下）滚动事件。
Note: Notclickingthe middle wheel button.
注意：不要单击中间的滚轮按钮。
回答by John Melville
No, there is just one event. When you look at the MouseWheelEventArgs class there is a property Delta. Delta is positive when the wheel is rotated away from the user and negative when the wheel is rotated toward the user.
不，只有一个事件。当您查看 MouseWheelEventArgs 类时，有一个属性 Delta。当滚轮远离用户旋转时，Delta 为正值，当滚轮朝向用户旋转时为负值。
回答by ΩmegaMan
For event related to mouse wheel, there is only one option
对于鼠标滚轮相关的事件，只有一种选择
No, there are others.
不，还有其他人。
There is also the PreviewMouseWheel(which functions just like the MouseWheelevent and the below code code can be used too).
还有PreviewMouseWheel（它的功能就像MouseWheel事件一样，下面的代码也可以使用）。
The Preview, if needed, has a Deltaproperty too which gives the direction of the wheel.
如果需要，预览也有一个Delta属性，它给出了轮子的方向。
Example
例子
private void PreviewMouseWheel(object sender, MouseWheelEventArgs e)
{
if (e.Delta > 0)
DoActionUp();
else if (e.Delta < 0)
DoActionDown();
}
