C#窗体全屏功能实例

概要：简要介绍窗体全屏的方法，列出实现窗体的全屏功能以及全屏功能的快捷键的代码；

 ps：非常感谢@iheartwater的热心帮助，代码已做完善，请直接查看修改后的代码

导航：  

• 窗体全屏
• 代码
• 完善后的代码
• 参考

---

1.窗体全屏

窗体全屏的方法：

1. 隐藏任务栏、设置工作区域
2. 窗体最大化、设置窗体边框样式

2.代码

  public partial class FrmFullScreen : Form
    {
        Boolean m_IsFullScreen = false;//标记是否全屏
        Rectangle rectOld = Rectangle.Empty;
        public FrmFullScreen()
        {
            InitializeComponent();
        }
        /// <summary>
        /// 全屏按钮的Click事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnFullScreen_Click(object sender, EventArgs e)
        {
            m_IsFullScreen = !m_IsFullScreen;//点一次全屏，再点还原。  
    
            SetFormFullScreen(m_IsFullScreen);

            this.SuspendLayout();
            if (m_IsFullScreen)//全屏 
            {
                this.WindowState = FormWindowState.Maximized; 
                this.FormBorderStyle = FormBorderStyle.None;
            }
            else//还原 TODO:还原后的窗体应该与全屏前的大小一致
            {
                this.WindowState = FormWindowState.Normal;
                this.FormBorderStyle = FormBorderStyle.Sizable;
            }
            this.ResumeLayout(false);
        }
        /// <summary>
        /// 全屏的快捷功能，F11相当于单机按钮；Esc健，如果全屏则退出全屏
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnFullScreen_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.F11)
            {
                btnFullScreen.PerformClick();
                e.Handled = true;
            }
            else if (e.KeyCode == Keys.Escape)//esc键盘退出全屏
            {
                if (m_IsFullScreen)
                {
                    e.Handled = true;
                    SetFormFullScreen(false);
                    this.WindowState = FormWindowState.Normal;//还原  
                    this.FormBorderStyle = FormBorderStyle.Sizable;
                }
            }
        }
        /// <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

        [DllImport("user32.dll", EntryPoint = "ShowWindow")]
        public static extern Int32 ShowWindow(Int32 hwnd, Int32 nCmdShow);
        public const Int32 SW_SHOW = 5; public const Int32 SW_HIDE = 0;

        [DllImport("user32.dll", EntryPoint = "SystemParametersInfo")]
        private static extern Int32 SystemParametersInfo(Int32 uAction, Int32 uParam, ref Rectangle lpvParam, Int32 fuWinIni);
        public const Int32 SPIF_UPDATEINIFILE = 0x1;
        public const Int32 SPI_SETWORKAREA = 47;
        public const Int32 SPI_GETWORKAREA = 48;

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

        #endregion
    }

窗体：

3.完善后的代码：

非常感谢@iheartwater的热心帮助，更改后的代码能够解决”全屏后，窗体能够恢复到原来的状态，包括位置（Loaction）和大小（Size）“，唉，其实，原因还挺简单的。

 public partial class FrmFullScreen : Form
    {
        Boolean m_IsFullScreen = false;//标记是否全屏

        public FrmFullScreen()
        {
            InitializeComponent();
        }
        /// <summary>
        /// 全屏按钮的Click事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnFullScreen_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>
        /// 全屏的快捷功能，F11相当于单机按钮；Esc健，如果全屏则退出全屏
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnFullScreen_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.F11)
            {
                btnFullScreen.PerformClick();
                e.Handled = true;
            }
            else if (e.KeyCode == Keys.Escape)//esc键盘退出全屏
            {
                if (m_IsFullScreen)
                {
                    e.Handled = true;
                    this.WindowState = FormWindowState.Normal;//还原  
                    this.FormBorderStyle = FormBorderStyle.Sizable;
                    SetFormFullScreen(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

        [DllImport("user32.dll", EntryPoint = "ShowWindow")]
        public static extern Int32 ShowWindow(Int32 hwnd, Int32 nCmdShow);
        public const Int32 SW_SHOW = 5; public const Int32 SW_HIDE = 0;

        [DllImport("user32.dll", EntryPoint = "SystemParametersInfo")]
        private static extern Int32 SystemParametersInfo(Int32 uAction, Int32 uParam, ref Rectangle lpvParam, Int32 fuWinIni);
        public const Int32 SPIF_UPDATEINIFILE = 0x1;
        public const Int32 SPI_SETWORKAREA = 47;
        public const Int32 SPI_GETWORKAREA = 48;

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

        #endregion
    }

 4.参考：

 http://blog.csdn.net/wuyazhe/article/details/5728286

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