#region 无焦点窗体[System.Runtime.InteropServices.DllImport("user32.dll")] private extern static IntPtr SetActiveWindow(IntPtr handle); private const int WM_ACTIVATE = 0x006; private const int WM_ACTIVATEAPP = 0x01C; private const int WM_NCACTIVATE = 0x086; private const int WA_INACTIVE = 0; private const int WM_MOUSEACTIVATE = 0x21; private const int MA_NOACTIVATE = 3; protected override void WndProc(ref Message m) { if (m.Msg == WM_MOUSEACTIVATE) { m.Result = new IntPtr(MA_NOACTIVATE); return; } else if (m.Msg == WM_NCACTIVATE) { if (((int)m.WParam & 0xFFFF) != WA_INACTIVE) { if (m.LParam != IntPtr.Zero) { SetActiveWindow(m.LParam); } else { SetActiveWindow(IntPtr.Zero); } } } base.WndProc(ref m); }#endregion