我要评论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
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