C# 有没有一种快速的方法来获得鼠标下的控件？
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Is there a quick way to get the control that's under the mouse?
提问by Simon
I need to find the control under the mouse, within an event of another control. I could start with GetTopLeveland iterate down using GetChildAtPoint, but is there a quicker way?
我需要在另一个控件的事件中找到鼠标下的控件。我可以开始GetTopLevel并使用 迭代GetChildAtPoint，但有没有更快的方法？
采纳答案by Hans Passant
This code doesn't make a lot of sense, but it does avoid traversing the Controls collections:
这段代码没有多大意义，但它确实避免了遍历 Controls 集合：
[System.Runtime.InteropServices.DllImport("user32.dll")]
private static extern IntPtr WindowFromPoint(Point pnt);
private void Form1_MouseMove(object sender, MouseEventArgs e) {
IntPtr hWnd = WindowFromPoint(Control.MousePosition);
if (hWnd != IntPtr.Zero) {
Control ctl = Control.FromHandle(hWnd);
if (ctl != null) label1.Text = ctl.Name;
}
}
private void button1_Click(object sender, EventArgs e) {
// Need to capture to see mouse move messages...
this.Capture = true;
}
回答by Lucas Jones
Untested and off the top of my head (and maybe slow...):
未经测试并且在我的头顶上（也许很慢......）：
Control GetControlUnderMouse() {
foreach ( Control c in this.Controls ) {
if ( c.Bounds.Contains(this.PointToClient(MousePosition)) ) {
return c;
}
}
}
Or to be fancy with LINQ:
或者喜欢 LINQ：
return Controls.Where(c => c.Bounds.Contains(PointToClient(MousePosition))).FirstOrDefault();
I'm not sure how reliable this would be, though.
不过，我不确定这有多可靠。
