//步骤
//1.导入代码
//2.事件中添加form_1mousedown函数
//3.在load函数中定义AnimateWindow语句，注意有两个引用。
//4.DllImport若有错误，按shift+alt+F10添加第一个解决
 [System.Runtime.InteropServices.DllImport("user32.dll")]//api加载声明
        protected static extern bool AnimateWindow(IntPtr hWnd, int dwTime, int dwFlags);//定义AnimateWindow
        public const Int32 AW_BLEND = 0x00080000;
        public const Int32 AW_CENTER = 0x00000010;
        public const Int32 AW_ACTIVATE = 0x00020000;
        public const Int32 AW_HIDE = 0x00010000;
        public const Int32 AW_SLIDE = 0x00040000;
 public Form1()
        {
            InitializeComponent();
            SetClassLong(this.Handle, GCL_STYLE, GetClassLong(this.Handle, GCL_STYLE) | CS_DropSHADOW);//API函数加载

，实现窗体边框阴影效果
            this.SetStyle(ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint |

ControlStyles.OptimizedDoubleBuffer, true);
        }
 #region 窗体拖动代码
        //
        public const int WM_NCLBUTTONDOWN = 0xA1;
        public const int HTCAPTION = 0x2;

[DllImportAttribute("user32.dll")]
        public static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);

[DllImportAttribute("user32.dll")]
        public static extern bool ReleaseCapture();
        private void Form1_MouseDown(object sender, MouseEventArgs e)//在窗体事件中手动添加，注意引用，无引用则无法完成
        {
            ReleaseCapture();
            SendMessage(Handle, WM_NCLBUTTONDOWN, HTCAPTION, 0);
        }
        #endregion
        #region 窗体边框阴影效果
        const int CS_DropSHADOW = 0x20000;
        const int GCL_STYLE = (-26);
        //声明win32 api
        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        public static extern int SetClassLong(IntPtr hwnd, int nIndex, int deNewLong);
        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        public static extern int GetClassLong(IntPtr hwnd, int nIndex);   #endregion

private void Form1_Load(object sender, EventArgs e)
            {
                AnimateWindow(this.Handle, 500, AW_BLEND | AW_CENTER | AW_ACTIVATE);

}
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            AnimateWindow(this.Handle, 500, AW_CENTER | AW_BLEND | AW_HIDE);
        }