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 externbool 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。