var idx = 1; // 屏幕序号(0,1,2)
this.Left = WpfScreenHelper.Screen.AllScreens.ToList()[idx].Bounds.Left;
this.Top = WpfScreenHelper.Screen.AllScreens.ToList()[idx].Bounds.Top;
this.WindowState = WindowState.Normal;
this.WindowStyle = WindowStyle.SingleBorderWindow;
this.WindowStyle = WindowStyle.None;
this.WindowState = WindowState.Maximized;

var idx = 1;
WpfScreenHelper.WindowHelper.SetWindowPosition(
                this,
                WindowPositions.TopLeft, 
                WpfScreenHelper.Screen.AllScreens.ElementAt(idx));

this.WindowState = WindowState.Normal;
this.WindowStyle = WindowStyle.SingleBorderWindow;
this.WindowStyle = WindowStyle.None;
this.WindowState = WindowState.Maximized;