c#winform窗口一直置顶显示在桌面最上方或最底层的方法

一、

在最前面：
usingSystem.Runtime.InteropServices;
在定义部分引入下面两个函数：
[DllImport("user32")]
privatestaticexternIntPtrFindWindow(stringlpClassName,stringlpWindowName);
[DllImport("user32")]
privatestaticexternIntPtrSetParent(IntPtrhWndChild,IntPtrhWndNewParent);
在窗体On_Load事件中添加（Santos的代码）：
IntPtrhDeskTop=FindWindow("Progman","ProgramManager");
SetParent(this.Handle,hDeskTop);
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、

usingSystem;
usingSystem.Collections.Generic;
usingSystem.ComponentModel;
usingSystem.Data;
usingSystem.Drawing;
usingSystem.Text;
usingSystem.Windows.Forms;
usingSystem.Runtime.InteropServices;
namespaceShowInDesk
{
publicpartialclassForm1:Form
{
IntPtrhDesktop;
publicconstintGW_CHILD=5;
publicForm1()
{
InitializeComponent();
this.hDesktop=GetDesktopHandle(DesktopLayer.Progman);
EmbedDesktop(this,this.Handle,this.hDesktop);
isMouseDown=false;
}
publicIntPtrGetDesktopHandle(DesktopLayerlayer){//hWnd=newHandleRef();
HandleRefhWnd;
IntPtrhDesktop=newIntPtr();
switch(layer)
{
caseDesktopLayer.Progman:
hDesktop=Win32Support.FindWindow("Progman",null);//第一层桌面
break;
caseDesktopLayer.SHELLDLL:
hDesktop=Win32Support.FindWindow("Progman",null);//第一层桌面
hWnd=newHandleRef(this,hDesktop);
hDesktop=Win32Support.GetWindow(hWnd,GW_CHILD);//第2层桌面
break;
caseDesktopLayer.FolderView:
hDesktop=Win32Support.FindWindow("Progman",null);//第一层桌面
hWnd=newHandleRef(this,hDesktop);
hDesktop=Win32Support.GetWindow(hWnd,GW_CHILD);//第2层桌面
hWnd=newHandleRef(this,hDesktop);
hDesktop=Win32Support.GetWindow(hWnd,GW_CHILD);//第3层桌面
break;
}
returnhDesktop;
}
publicvoidEmbedDesktop(ObjectembeddedWindow,IntPtrchildWindow,IntPtrparentWindow)
{
Formwindow=(Form)embeddedWindow;
HandleRefHWND_BOTTOM=newHandleRef(embeddedWindow,newIntPtr(1));
constintSWP_FRAMECHANGED=0x0020;//发送窗口大小改变消息
Win32Support.SetParent(childWindow,parentWindow);
Win32Support.SetWindowPos(newHandleRef(window,childWindow),HWND_BOTTOM,300,300,window.Width,window.Height,SWP_FRAMECHANGED);
}
}
}

2、

usingSystem;
usingSystem.Collections.Generic;
usingSystem.Text;
usingSystem.Runtime.InteropServices;
namespaceShowInDesk
{
classWin32Support
{
[DllImport("user32.dll",CharSet=CharSet.Auto)]
publicstaticexternIntPtrFindWindow(stringclassName,stringwindowName);
[DllImport("user32.dll",CharSet=CharSet.Auto,ExactSpelling=true)]
publicstaticexternIntPtrGetWindow(HandleRefhWnd,intnCmd);
[DllImport("user32.dll")]
publicstaticexternIntPtrSetParent(IntPtrchild,IntPtrparent);
[DllImport("user32.dll",EntryPoint="GetDCEx",CharSet=CharSet.Auto,ExactSpelling=true)]
publicstaticexternIntPtrGetDCEx(IntPtrhWnd,IntPtrhrgnClip,intflags);
[DllImport("user32.dll",CharSet=CharSet.Auto,ExactSpelling=true)]
publicstaticexternboolSetWindowPos(HandleRefhWnd,HandleRefhWndInsertAfter,intx,inty,intcx,intcy,intflags);
[DllImport("user32.dll")]
publicstaticexternintReleaseDC(IntPtrwindow,IntPtrhandle);
}
}

3、

namespaceShowInDesk
{
publicenumDesktopLayer
{
Progman=0,
SHELLDLL=1,
FolderView=2
}
}

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。

internalclassUser32
{
publicconstintSE_SHUTDOWN_PRIVILEGE=0x13;
[DllImport("user32.dll")]
publicstaticexternIntPtrFindWindow(stringlpClassName,stringlpWindowName);
[DllImport("user32.dll")]
publicstaticexternIntPtrSetParent(IntPtrhWndChild,IntPtrhWndNewParent);
[DllImport("user32.dll")]
publicstaticexternboolSetWindowPos(IntPtrhWnd,inthWndInsertAfter,intX,intY,intcx,
intcy,uintuFlags);
}

然后,在WinForm里面：

publicMainForm()
{
InitializeComponent();
try
{
if(Environment.OSVersion.Version.Major<6)
{
base.SendToBack();
IntPtrhWndNewParent=User32.FindWindow("Progman",null);
User32.SetParent(base.Handle,hWndNewParent);
}
else
{
User32.SetWindowPos(base.Handle,1,0,0,0,0,User32.SE_SHUTDOWN_PRIVILEGE);
}
}
catch(ApplicationExceptionexx)
{
MessageBox.Show(this,exx.Message,"PintoDesktop");
}
}
privatevoidMainForm_Activated(objectsender,EventArgse)
{
if(Environment.OSVersion.Version.Major>=6)
{
User32.SetWindowPos(base.Handle,1,0,0,0,0,User32.SE_SHUTDOWN_PRIVILEGE);
}
}
privatevoidMainForm_Paint(objectsender,PaintEventArgse)
{
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。