c# winform窗口一直置顶显示在桌面最上方的方法

一、

在最前面：
using   System.Runtime.InteropServices;


在定义部分引入下面两个函数：
[DllImport( "user32 ")]
private   static   extern   IntPtr   FindWindow(string   lpClassName,string   lpWindowName);

[DllImport( "user32 ")]
private   static   extern   IntPtr   SetParent(IntPtr   hWndChild,   IntPtr   hWndNewParent);

在窗体On_Load事件中添加（Santos的代码）：
IntPtr   hDeskTop=FindWindow( "Progman ",   "Program   Manager ");
SetParent(this.Handle,hDeskTop);

文章摘自：http://topic.csdn.net/t/20061022/23/5101048.html 另一个方法可以修改桌面壁纸实现

经测试，win2000--win2003 、xp下嵌入桌面，不支持vista和win7以上系统

 

二、

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

namespace ShowInDesk
{
    publicpartialclass Form1 : Form
    {
        IntPtr hDesktop;
        publicconstint GW_CHILD =5;
        public Form1()
        {
            InitializeComponent();
            this.hDesktop = GetDesktopHandle(DesktopLayer.Progman);
            EmbedDesktop(this, this.Handle, this.hDesktop);
            isMouseDown =false;
        }
        public IntPtr GetDesktopHandle(DesktopLayer layer) { //hWnd = new HandleRef();
            HandleRef hWnd;
            IntPtr hDesktop =new IntPtr();
            switch (layer)
            {
                case DesktopLayer.Progman:
                    hDesktop = Win32Support.FindWindow("Progman", null);//第一层桌面
                    break;
                case DesktopLayer.SHELLDLL:
                    hDesktop = Win32Support.FindWindow("Progman", null);//第一层桌面
                    hWnd =new HandleRef(this, hDesktop);
                    hDesktop = Win32Support.GetWindow(hWnd, GW_CHILD);//第2层桌面
                    break;
                case DesktopLayer.FolderView:
                    hDesktop = Win32Support.FindWindow("Progman", null);//第一层桌面
                    hWnd =new HandleRef(this, hDesktop);
                    hDesktop = Win32Support.GetWindow(hWnd, GW_CHILD);//第2层桌面
                    hWnd =new HandleRef(this, hDesktop);
                    hDesktop = Win32Support.GetWindow(hWnd, GW_CHILD);//第3层桌面
                    break;
            }
            return hDesktop;
        }
        publicvoid EmbedDesktop(Object embeddedWindow, IntPtr childWindow, IntPtr parentWindow)
        {
            Form window = (Form)embeddedWindow;
            HandleRef HWND_BOTTOM =new HandleRef(embeddedWindow, new IntPtr(1));
            constint SWP_FRAMECHANGED =0x0020;//发送窗口大小改变消息
            Win32Support.SetParent(childWindow, parentWindow);
            Win32Support.SetWindowPos(new HandleRef(window, childWindow), HWND_BOTTOM, 300, 300, window.Width, window.Height, SWP_FRAMECHANGED);


        }

    }
}

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;

namespace ShowInDesk
{
    class Win32Support
    {
        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        publicstaticextern IntPtr FindWindow(string className, string windowName);
        [DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling =true)]
        publicstaticextern IntPtr GetWindow(HandleRef hWnd, int nCmd);
        [DllImport("user32.dll")]
        publicstaticextern IntPtr SetParent(IntPtr child, IntPtr parent);
        [DllImport("user32.dll", EntryPoint ="GetDCEx", CharSet = CharSet.Auto, ExactSpelling =true)]
        publicstaticextern IntPtr GetDCEx(IntPtr hWnd, IntPtr hrgnClip, int flags);
        [DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling =true)]
        publicstaticexternbool SetWindowPos(HandleRef hWnd, HandleRef hWndInsertAfter, int x, int y, int cx, int cy, int flags);
        [DllImport("user32.dll")]
        publicstaticexternint ReleaseDC(IntPtr window, IntPtr handle);
    }
}



namespace ShowInDesk
{
    publicenum DesktopLayer
    {
        Progman =0,
        SHELLDLL =1,
        FolderView =2
    }
}

 

http://www.notesmaker.com/bbs/viewthread.php?tid=48&page=1 方法很多，看这里

 

三、

入桌面窗口最底层，并提供详细的实现代码供参考。

此类将窗体永远置于窗口最底层。

首先, 调用一些User32.dll的WinAPI函数。

internal  class  User32 
{ 
public  const  int  SE_SHUTDOWN_PRIVILEGE  = 0x13 ; 

[DllImport( " user32.dll " )] 
public  static  extern  IntPtr FindWindow( string  lpClassName,  string  lpWindowName); 

[DllImport( " user32.dll " )] 
public  static  extern  IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent); 

[DllImport( " user32.dll " )] 
public  static  extern bool  SetWindowPos(IntPtr hWnd,  int  hWndInsertAfter,  int  X,  int  Y,  int  cx, 
int  cy,  uint  uFlags); 
}

然后, 在WinForm里面：

public  MainForm() 
{ 
InitializeComponent(); 

try
{ 
if  (Environment.OSVersion.Version.Major  < 6 ) 
{ 
base .SendToBack(); 

IntPtr hWndNewParent  =  User32.FindWindow( " Progman " ,  null ); 
User32.SetParent( base .Handle, hWndNewParent); 
} 
else
{ 
User32.SetWindowPos( base .Handle,  1 ,  0 ,  0 ,  0 ,  0 , User32.SE_SHUTDOWN_PRIVILEGE); 
} 
} 
catch  (ApplicationException exx) 
{ 
MessageBox.Show( this , exx.Message,  " Pin to Desktop " ); 
} 
} 

private  void  MainForm_Activated( object  sender, EventArgs e) 
{ 
if  (Environment.OSVersion.Version.Major  >= 6 ) 
{ 
User32.SetWindowPos( base .Handle,  1 ,  0 ,  0 ,  0 ,  0 , User32.SE_SHUTDOWN_PRIVILEGE); 
} 
} 

private  void  MainForm_Paint( object  sender, PaintEventArgs e) 
{ 
if  (Environment.OSVersion.Version.Major  >= 6 ) 
{ 
User32.SetWindowPos( base .Handle,  1 ,  0 ,  0 ,  0 ,  0 , User32.SE_SHUTDOWN_PRIVILEGE); 
} 
}

以上介绍的就是C#如何让WinForm嵌入桌面窗口最底层，希望对你有所帮助。