1.导入System.Runtime.InteropServices命名空间。
2.API函数ShowWindow()能够控制人和窗体的现实状态,其声明格式如下:
3.API函数FindWindow()可用于返回任务栏所在窗体类“Shell_TrayWnd”句柄,其声明格式如下:
        [DllImport("user32.dll")]
        public static extern int ShowWindow(int hwnd,int nCmdShow);
        [DllImport("user32.dll")]
        public static extern int FindWindow(string lpClassName,string lpWindowName);
        private void button1_Click(object sender, EventArgs e)
        {
            ShowWindow(FindWindow("Shell_TrayWnd",null),SW_HIDE);
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        }
        private void button2_Click(object sender, EventArgs e)
        {
            ShowWindow(FindWindow("Shell_TrayWnd",null),SW_RESTORE);
        }