C# WinForm中 获得当前鼠标所在控件 或 将窗体中鼠标所在控件名显示在窗体标题上

原文地址：http://www.cnblogs.com/08shiyan/archive/2011/04/14/2015758.html

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 * 课题：将窗体中鼠标所在控件名显示在窗体标题上
 * 作者：ZAXX
 * QQ : 94027486
 * 本课题可简单扩展：获取屏幕上鼠标所在位置的窗口句柄与类名
 **********************/
using System;
using System.Drawing;
using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace Zaxx
{
  public partial class MouseOnControl: Form
  {
  [DllImport("User32.dll")]
  private static extern IntPtr WindowFromPoint(Point p);

  Timer timer;

  public MouseOnControl()
  {
  InitializeComponent();
  timer = new Timer();
  timer.Interval = 200;
  timer.Enabled = true;
  timer.Tick += new EventHandler(timer_Tick);
  }

  void timer_Tick(object sender, EventArgs e)
  {
  Point p = Cursor.Position;
  IntPtr h = WindowFromPoint(p);
  foreach (Control con in this.Controls)
  if (con.Handle == h)
  this.Text = con.Name;
  }
  }
}