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。

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 } }

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。

Modified Code 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 }

窗体全屏

窗体全屏的方法：

隐藏任务栏、设置工作区域

窗体最大化、设置窗体边框样式