得到焦点控件

public class MyForm : Form 

{ 

[DllImport("user32.dll", CharSet=CharSet.Auto, CallingConvention=CallingConvention.Winapi)] 

internal static extern IntPtr GetFocus(); 

//得到焦点控件

private Control GetFocusedControl() 

{

Control focusedControl = null; 

// To get hold of the focused control: 

IntPtr focusedHandle = GetFocus(); 

if(focusedHandle != IntPtr.Zero) 

// Note that if the focused Control is not a .Net control, then this will return null.

focusedControl = Control.FromHandle(focusedHandle); 

return focusedControl; 

} 

}