C#窗体全屏功能

最近有朋友让我给他弄个应用程序全屏的功能，例如银行的取号程序界面。所以我从网上查询了一些实现的方法。

C#应用程序中如何实现全屏幕显示功能？
 效果就像windows自带的屏幕保护程序和众多的游戏那样，无论是否设置了“将任务栏保持在其他窗口的前端”都不显示任务栏

实现方式一

在网上找来一些简单的实现方式：

this.FormBorderStyle = FormBorderStyle.None;     //设置窗体为无边框样式
this.WindowState = FormWindowState.Maximized;    //最大化窗体 

然后再设置窗体的位置和大小，例如：Width=1024 Height=768 Left=0 Top=0等size的值

把以上两句代码直接放到Form1_Load的方法中，就可以了，比较简单，我就不贴代码了。

参考出处：http://blog.csdn.net/friendan/article/details/7350570

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实现方式二

调用系统的API函数，如user32.dll中的FindWindow和ShowWindow函数，具体代码如下：

        [DllImport("user32.dll", EntryPoint = "ShowWindow")]
        public static extern Int32 ShowWindow(Int32 hwnd, Int32 nCmdShow);

        [DllImport("user32.dll", EntryPoint = "FindWindow")]
        private static extern Int32 FindWindow(string lpClassName, string lpWindowName);

代码如下：

using System;
using System.Windows.Forms;

using System.Drawing;
using System.Runtime.InteropServices;

namespace FullScr
{
    public partial class Form1 : Form
    {

        Boolean m_IsFullScreen = false;//标记是否全屏

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
        }

        /// <summary>
        ///  全屏按钮的Click事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            m_IsFullScreen = !m_IsFullScreen;//点一次全屏，再点还原。
            this.SuspendLayout();
            if (m_IsFullScreen)//全屏 ,按特定的顺序执行
            {
                SetFormFullScreen(m_IsFullScreen);
                this.FormBorderStyle = FormBorderStyle.None;
                this.WindowState = FormWindowState.Maximized;
                this.Activate();//
            }
            else//还原，按特定的顺序执行——窗体状态，窗体边框，设置任务栏和工作区域
            {
                this.WindowState = FormWindowState.Normal;
                this.FormBorderStyle = FormBorderStyle.Sizable;
                SetFormFullScreen(m_IsFullScreen);
                this.Activate();
            }
            this.ResumeLayout(false);
        }

        /// <summary>
        /// 设置全屏或这取消全屏
        /// </summary>
        /// <param name="fullscreen">true:全屏 false:恢复</param>
        /// <param name="rectOld">设置的时候，此参数返回原始尺寸，恢复时用此参数设置恢复</param>
        /// <returns>设置结果</returns>
        public Boolean SetFormFullScreen(Boolean fullscreen)//, ref Rectangle rectOld
        {
            Rectangle rectOld = Rectangle.Empty;
            Int32 hwnd = 0;
            hwnd = FindWindow("Shell_TrayWnd", null);//获取任务栏的句柄

            if (hwnd == 0) return false;

            if (fullscreen)//全屏
            {
                ShowWindow(hwnd, SW_HIDE);//隐藏任务栏

                SystemParametersInfo(SPI_GETWORKAREA, 0, ref rectOld, SPIF_UPDATEINIFILE);//get屏幕范围
                Rectangle rectFull = Screen.PrimaryScreen.Bounds;//全屏范围
                SystemParametersInfo(SPI_SETWORKAREA, 0, ref rectFull, SPIF_UPDATEINIFILE);//窗体全屏幕显示
            }
            else//还原
            {
                ShowWindow(hwnd, SW_SHOW);//显示任务栏
                SystemParametersInfo(SPI_SETWORKAREA, 0, ref rectOld, SPIF_UPDATEINIFILE);//窗体还原
            }
            return true;
        }

        #region user32.dll

        public const Int32 SPIF_UPDATEINIFILE = 0x1;
        public const Int32 SPI_SETWORKAREA = 47;
        public const Int32 SPI_GETWORKAREA = 48;
        public const Int32 SW_SHOW = 5;
        public const Int32 SW_HIDE = 0;

        [DllImport("user32.dll", EntryPoint = "ShowWindow")]
        public static extern Int32 ShowWindow(Int32 hwnd, Int32 nCmdShow);

        [DllImport("user32.dll", EntryPoint = "FindWindow")]
        private static extern Int32 FindWindow(string lpClassName, string lpWindowName);

        [DllImport("user32.dll", EntryPoint = "SystemParametersInfo")]
        private static extern Int32 SystemParametersInfo(Int32 uAction, Int32 uParam, ref Rectangle lpvParam, Int32 fuWinIni);

        #endregion

    }
}

参考出处：http://www.cnblogs.com/ArcScofield/archive/2013/01/02/Form_Fullscreen.html