Winform窗体效果

以下是一段使用api的窗口特效代码，小测一把看是不是在窗口显示的时候会显示各种特殊效果，实践出真理！

[System.Runtime.InteropServices.DllImport("user32")]
        private static extern bool AnimateWindow(IntPtr hwnd, int dwTime, int dwFlags);
        private const int AW_HOR_POSITIVE = 0x0001;//从左向右显示
        private const int AW_HOR_NEGATIVE = 0x0002;//从右向左显示
        private const int AW_VER_POSITIVE = 0x0004;//从上到下显示
        private const int AW_VER_NEGATIVE = 0x0008;//从下到上显示
        private const int AW_CENTER = 0x0010;//从中间向四周
        private const int AW_HIDE = 0x10000;
        private const int AW_ACTIVATE = 0x20000;//普通显示
        private const int AW_SLIDE = 0x40000;
        private const int AW_BLEND = 0x80000;//透明渐变显示效果

        private void Form1_Load(object sender, System.EventArgs e)
        {      
            int animatetype = 10;
            Random a = new Random();
            int dwFlags = (int)a.Next(animatetype);
            switch (dwFlags)
            {
                case 0://普通显示
                    AnimateWindow(Handle, 1000, AW_ACTIVATE);
                    break;
                case 1://从左向右显示
                    AnimateWindow(Handle, 1000, AW_HOR_POSITIVE);
                    break;
                case 2://从右向左显示
                    AnimateWindow(Handle, 1000, AW_HOR_NEGATIVE);
                    break;