Question

C# mousewheel 事件

请问mousewheel 事件中如何判断鼠标滑轮是向上滑动还是向下滑动了？

Answer 1

private void Form1_Load(object sender, EventArgs e)
{
this.MouseWheel += new MouseEventHandler(Form1_MouseWheel);
}

void Form1_MouseWheel(object sender, MouseEventArgs e)
{
if (e.Delta > 0)
{
this.Text = "正在向上滚动滑轮";
}
else
{
this.Text = "正在向下滚动滑轮";
}
}

Answer 2

可以呀？你是不是没有让Form成为焦点？