C# WinForm 关于窗体最大化时的是否全屏效果与是否遮盖任务栏

0.新建窗体 及添加按钮

1.
  执行如下按钮事件
  private void btnFormMax_Click(object sender, EventArgs e)
  {
     if (this.WindowState == FormWindowState.Maximized)
     {
         this.WindowState = FormWindowState.Normal;
     }
     else
     {
         this.WindowState = FormWindowState.Maximized;
     }
  }
  窗体最大化时 非全屏 不会遮盖任务栏
  此时this.FormBorderStyle 默认为 Sizable

2.
  执行如下按钮事件
  private void btnFormMax_Click(object sender, EventArgs e)
  {
      if (this.WindowState == FormWindowState.Maximized)
      {        
         this.WindowState = FormWindowState.Normal;
      }
      else
      {
         this.FormBorderStyle = FormBorderStyle.None;
         this.WindowState = FormWindowState.Maximized;
      }
   }

  窗体最大化时 会全屏 及遮盖任务栏
  此时this.FormBorderStyle 为 None 不会显示窗体标题栏等相关

3.
  执行如下按钮事件
  private void btnFormMax_Click(object sender, EventArgs e)
  {
      if (this.WindowState == FormWindowState.Maximized)
      {        
         this.WindowState = FormWindowState.Normal;
      }
      else
      {
         this.FormBorderStyle = FormBorderStyle.None;
         this.MaximumSize = new Size(Screen.PrimaryScreen.WorkingArea.Width, Screen.PrimaryScreen.WorkingArea.Height);
         this.WindowState = FormWindowState.Maximized;
      }
   }

  窗体最大化时 非全屏 不会遮盖任务栏
  此时this.FormBorderStyle 为 None 不会显示窗体标题栏等相关


[转]窗体最大化的时候，如何指定窗体的位置、大小(C#) http://www.cnblogs.com/adandelion/archive/2008/04/03/1136198.html 
using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Text; 
using System.Windows.Forms; 

namespace WindowsApplication1 
{ 
public partial class FormRegion : Form 
{ 
private const long WM_GETMINMAXINFO = 0x24; 

public struct POINTAPI 
{ 
public int x; 
public int y; 
} 

public struct MINMAXINFO 
{ 
public POINTAPI ptReserved; 
public POINTAPI ptMaxSize; 
public POINTAPI ptMaxPosition; 
public POINTAPI ptMinTrackSize; 
public POINTAPI ptMaxTrackSize; 
} 
public FormRegion() 
{ 
InitializeComponent(); 
this.MaximumSize = new Size(Screen.PrimaryScreen.WorkingArea.Width, Screen.PrimaryScreen.WorkingArea.Height); 
} 


protected override void WndProc(ref System.Windows.Forms.Message m) 
{ 
base.WndProc(ref m); 
if (m.Msg == WM_GETMINMAXINFO) 
{ 
MINMAXINFO mmi = (MINMAXINFO)m.GetLParam(typeof(MINMAXINFO)); 
mmi.ptMinTrackSize.x = this.MinimumSize.Width; 
mmi.ptMinTrackSize.y = this.MinimumSize.Height; 
if (this.MaximumSize.Width != 0 || this.MaximumSize.Height != 0) 
{ 
mmi.ptMaxTrackSize.x = this.MaximumSize.Width; 
mmi.ptMaxTrackSize.y = this.MaximumSize.Height; 
} 
mmi.ptMaxPosition.x = 1; 
mmi.ptMaxPosition.y = 1; 

System.Runtime.InteropServices.Marshal.StructureToPtr(mmi, m.LParam, true); 
} 
} 
} 
}  


MessageBox.Show("当前窗体标题栏高度"+(this.Height - this.ClientRectangle.Height).ToString());//获得当前窗体标题栏高度 

ClientRectangle//获取表示控件的工作区的矩形 

MessageBox.Show(SystemInformation.PrimaryMonitorSize.ToString()); //获取主显示器屏幕的尺寸(像素) 
//获取主显示器当前当前视频模式的尺寸(以象素为单位) 

MessageBox.Show("菜单栏高度"+SystemInformation.MenuHeight.ToString()); //获取标准菜单栏的高度 
MessageBox.Show("标题栏高度"+SystemInformation.CaptionHeight.ToString()); //获取标准标题栏的高度 

MenuHeight//获取一个菜单行的高度(以象素为单位) 

CaptionHeight//获取窗口的标准标题栏区域的高度(以象素为单位)