利用API实现窗体淡入淡出特效

        #region 利用API实现窗体淡入淡出特效
        //窗体淡入淡出特效
        public const Int32 AW_HOR_POSITIVE = 0x00000001; // 从左到右打开窗口
        public const Int32 AW_HOR_NEGATIVE = 0x00000002; // 从右到左打开窗口
        public const Int32 AW_VER_POSITIVE = 0x00000004;// 从上到下打开窗口
        public const Int32 AW_VER_NEGATIVE = 0x00000008;// 从下到上打开窗口
        public const Int32 AW_CENTER = 0x00000010;
        public const Int32 AW_HIDE = 0x00010000; // 在窗体卸载时若想使用本函数就得加上此常量
        public const Int32 AW_ACTIVATE = 0x00020000; //在窗体通过本函数打开后，默认情况下会失去焦点，除非加上本常量
        public const Int32 AW_SLIDE = 0x00040000;
        public const Int32 AW_BLEND = 0x00080000;// 淡入淡出效果

        [System.Runtime.InteropServices.DllImport("user32.dll", CharSet = System.Runtime.InteropServices.CharSet.Auto)]
        public static extern bool AnimateWindow(
        IntPtr hwnd,  //  handle  to  window
        int dwTime,  //  duration  of  animation
        int dwFlags  //  animation  type
        );
        #endregion


//调用：
          AnimateWindow(Form2.Handle, 5000, AW_BLEND);//淡入窗体
          //Application.ExitThread();

          AnimateWindow(Form2.Handle, 5000, AW_SLIDE | AW_HIDE | AW_BLEND);//淡出窗体