protected override CreateParams CreateParams
        {
get
            {
                CreateParams cp = base.CreateParams; 
                cp.ExStyle |= 0x8000000; //使其在创建时处于非激活状态
                return cp;
            }
        }

           //设置窗体属性
            this.BackColor = Color.Fuchsia;
this.TransparencyKey = Color.Fuchsia;
this.TopMost = true; //置顶
//this.WindowState = FormWindowState.Maximized;
            this.ShowInTaskbar = false; //取消在任务栏中显示
            this.FormBorderStyle = FormBorderStyle.None;//取消标题栏、边框等
//this.StartPosition = FormStartPosition.CenterScreen;//窗体位置

        /// <summary>
/// 在主屏显示
/// </summary>
        private void PositionOnSecondaryScreen()
        {
            Screen secondaryScreen = null;
if (Screen.AllScreens.Length == 1)
            {
                secondaryScreen = Screen.PrimaryScreen;
            }
else
            {

foreach (Screen screen in Screen.AllScreens)
                {
if (screen.Primary == false)
                    {
                        secondaryScreen = screen;
break;
                    }
                }
            }

this.Location = secondaryScreen.WorkingArea.Location;
this.Size = secondaryScreen.WorkingArea.Size;

        }