C#窗體全屏功能實例代碼

來源：本站原創(chuàng)|時間：2020-01-10|欄目：C#教程|點擊：次

最近有朋友讓我給他弄個應用程序全屏的功能，例如銀行的取號程序界面。所以我從網(wǎng)上查詢了一些實現(xiàn)的方法。

C#應用程序中如何實現(xiàn)全屏幕顯示功能？
效果就像windows自帶的屏幕保護程序和眾多的游戲那樣，無論是否設置了“將任務欄保持在其他窗口的前端”都不顯示任務欄

實現(xiàn)方式一

在網(wǎng)上找來一些簡單的實現(xiàn)方式：

this.FormBorderStyle = FormBorderStyle.None;  //設置窗體為無邊框樣式
this.WindowState = FormWindowState.Maximized; //最大化窗體

然后再設置窗體的位置和大小，例如：Width=1024 Height=768 Left=0 Top=0等size的值

把以上兩句代碼直接放到Form1_Load的方法中，就可以了，比較簡單，我就不貼代碼了。

實現(xiàn)方式二

調用系統(tǒng)的API函數(shù)，如user32.dll中的FindWindow和ShowWindow函數(shù)，具體代碼如下：

 [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);

代碼如下：

using System;
using System.Windows.Forms;

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


namespace FullScr
{
 public partial class Form1 : Form
 {

  Boolean m_IsFullScreen = false;//標記是否全屏


  public Form1()
  {
   InitializeComponent();
  }


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

  /// <summary>
  /// 全屏按鈕的Click事件
  /// </summary>
  /// <param name="sender"></param>
  /// <param name="e"></param>
  private void button1_Click(object sender, EventArgs e)
  {
   m_IsFullScreen = !m_IsFullScreen;//點一次全屏，再點還原。 
   this.SuspendLayout();
   if (m_IsFullScreen)//全屏 ,按特定的順序執(zhí)行
   {
    SetFormFullScreen(m_IsFullScreen);
    this.FormBorderStyle = FormBorderStyle.None;
    this.WindowState = FormWindowState.Maximized;
    this.Activate();//
   }
   else//還原，按特定的順序執(zhí)行——窗體狀態(tài)，窗體邊框，設置任務欄和工作區(qū)域
   {
    this.WindowState = FormWindowState.Normal;
    this.FormBorderStyle = FormBorderStyle.Sizable;
    SetFormFullScreen(m_IsFullScreen);
    this.Activate();
   }
   this.ResumeLayout(false);
  }

  /// <summary> 
  /// 設置全屏或這取消全屏 
  /// </summary> 
  /// <param name="fullscreen">true:全屏 false:恢復</param> 
  /// <param name="rectOld">設置的時候，此參數(shù)返回原始尺寸，恢復時用此參數(shù)設置恢復</param> 
  /// <returns>設置結果</returns> 
  public Boolean SetFormFullScreen(Boolean fullscreen)//, ref Rectangle rectOld
  {
   Rectangle rectOld = Rectangle.Empty;
   Int32 hwnd = 0;
   hwnd = FindWindow("Shell_TrayWnd", null);//獲取任務欄的句柄

   if (hwnd == 0) return false;

   if (fullscreen)//全屏
   {
    ShowWindow(hwnd, SW_HIDE);//隱藏任務欄

    SystemParametersInfo(SPI_GETWORKAREA, 0, ref rectOld, SPIF_UPDATEINIFILE);//get屏幕范圍
    Rectangle rectFull = Screen.PrimaryScreen.Bounds;//全屏范圍
    SystemParametersInfo(SPI_SETWORKAREA, 0, ref rectFull, SPIF_UPDATEINIFILE);//窗體全屏幕顯示
   }
   else//還原 
   {
    ShowWindow(hwnd, SW_SHOW);//顯示任務欄
    SystemParametersInfo(SPI_SETWORKAREA, 0, ref rectOld, SPIF_UPDATEINIFILE);//窗體還原
   }
   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

 }
}

完善后的代碼：

非常感謝@iheartwater的熱心幫助，更改后的代碼能夠解決”全屏后，窗體能夠恢復到原來的狀態(tài)，包括位置（Loaction）和大?。⊿ize）“，唉，其實，原因還挺簡單的。

Modified Code
 public partial class FrmFullScreen : Form
 {
  Boolean m_IsFullScreen = false;//標記是否全屏

  public FrmFullScreen()
  {
   InitializeComponent();
  }
  /// <summary>
  /// 全屏按鈕的Click事件
  /// </summary>
  /// <param name="sender"></param>
  /// <param name="e"></param>
  private void btnFullScreen_Click(object sender, EventArgs e)
  {
   m_IsFullScreen = !m_IsFullScreen;//點一次全屏，再點還原。 
   this.SuspendLayout();
   if (m_IsFullScreen)//全屏 ,按特定的順序執(zhí)行
   {
    SetFormFullScreen(m_IsFullScreen);
    this.FormBorderStyle = FormBorderStyle.None;
    this.WindowState = FormWindowState.Maximized;
    this.Activate();//
   }
   else//還原，按特定的順序執(zhí)行——窗體狀態(tài)，窗體邊框，設置任務欄和工作區(qū)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，F(xiàn)11相當于單機按鈕；Esc健，如果全屏則退出全屏
  /// </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鍵盤退出全屏
   {
    if (m_IsFullScreen)
    {
     e.Handled = true;
     this.WindowState = FormWindowState.Normal;//還原 
     this.FormBorderStyle = FormBorderStyle.Sizable;
     SetFormFullScreen(false);
    }
   }
  }
  /// <summary> 
  /// 設置全屏或這取消全屏 
  /// </summary> 
  /// <param name="fullscreen">true:全屏 false:恢復</param> 
  /// <param name="rectOld">設置的時候，此參數(shù)返回原始尺寸，恢復時用此參數(shù)設置恢復</param> 
  /// <returns>設置結果</returns> 
  public Boolean SetFormFullScreen(Boolean fullscreen)//, ref Rectangle rectOld
  {
   Rectangle rectOld=Rectangle.Empty;
   Int32 hwnd = 0;
   hwnd = FindWindow("Shell_TrayWnd", null);//獲取任務欄的句柄

   if (hwnd == 0) return false;

   if (fullscreen)//全屏
   {
    ShowWindow(hwnd, SW_HIDE);//隱藏任務欄

    SystemParametersInfo(SPI_GETWORKAREA, 0, ref rectOld, SPIF_UPDATEINIFILE);//get 屏幕范圍
    Rectangle rectFull = Screen.PrimaryScreen.Bounds;//全屏范圍
    SystemParametersInfo(SPI_SETWORKAREA, 0, ref rectFull, SPIF_UPDATEINIFILE);//窗體全屏幕顯示
   }
   else//還原 
   {
    ShowWindow(hwnd, SW_SHOW);//顯示任務欄

    SystemParametersInfo(SPI_SETWORKAREA, 0, ref rectOld, SPIF_UPDATEINIFILE);//窗體還原
   }
   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
 }

窗體全屏

窗體全屏的方法：

隱藏任務欄、設置工作區(qū)域
窗體最大化、設置窗體邊框樣式

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