WinForm调用user32.dll实现全屏

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WinFormExample
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

//Boolean IsFullScreen = false;

private void Form1_Load(object sender, EventArgs e)
{

}

#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 int1, Int32 int2);

[DllImport("user32.dll", EntryPoint = "FindWindow")]
public static extern Int32 FindWindow(string str1, string str2);

[DllImport("user32.dll", EntryPoint = "SystemParametersInfo")]
public static extern Int32 SystemParametersInfo(Int32 int1, Int32 int2, ref Rectangle ref1, Int32 int3);

#endregion

public Boolean SetFullScreen(Boolean b)
{
Rectangle rectOld = Rectangle.Empty;

Int32 int1 = 0;

int1 = FindWindow("Shell_TrayWnd", null);

if (int1 == 0) return false;

if (b)
{
ShowWindow(int1, SW_HIDE);

SystemParametersInfo(SPI_GETWORKAREA, 0, ref rectOld, SPIF_UPDATEINIFILE);//屏幕范围

Rectangle rectFull = Screen.PrimaryScreen.Bounds;//全屏范围

SystemParametersInfo(SPI_SETWORKAREA, 0, ref rectFull, SPIF_UPDATEINIFILE);//全屏幕显示
}
else//还原
{
ShowWindow(int1, SW_SHOW);//任务栏

SystemParametersInfo(SPI_SETWORKAREA, 0, ref rectOld, SPIF_UPDATEINIFILE);//还原
}

return true;
}

private void button1_Click(object sender, EventArgs e)
{
//全屏

this.SuspendLayout();

SetFullScreen(true);

this.FormBorderStyle = FormBorderStyle.None;

this.WindowState = FormWindowState.Maximized;

this.Activate();

this.ResumeLayout(false);
}

private void button2_Click(object sender, EventArgs e)
{
//还原

this.WindowState = FormWindowState.Normal;

this.FormBorderStyle = FormBorderStyle.Sizable;

SetFullScreen(false);

this.Activate();

this.ResumeLayout(false);
}
}
}