获取IIS中网站信息的问题

[songmag]

想要获取iis中的网站信息用于分析，写了一个aspx页面读取所在IIS中的网站列表：

<%@ Page Language="C#" Debug="true" %>
<%@ Assembly Name="System.DirectoryServices, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" %>
<%@ Import namespace= "System.DirectoryServices"%>

<script runat="server">    
    protected void Page_Load(object sender, EventArgs e)
    {
        DirectoryEntry rootEntry = new DirectoryEntry("IIS://localhost/w3svc");
            foreach (DirectoryEntry entry in rootEntry.Children)
            {
                if (entry.SchemaClassName.Equals("IIsWebServer", StringComparison.OrdinalIgnoreCase))
                {
                    Response.Write("Name: "+entry.Name+"<br>");
                    Response.Write("<br>============<br>");

                 }
            }
    }
</script>
 

从网上查了很多相关问题，基本都是类型的代码。
我的iis中有差不多400个site，但是通过这个页面之显示出35个网站。
那位老大帮帮忙看看我的代码是不是有问题啊

[songmag]

找到了这样一个类似的问题，好像也出现了这样的情况，但是按照他的解决方案，我无法调试通过。
帮帮忙啊？
我的代码如下：

<%@ Page Language="C#" Debug="true" %>
<%@ Assembly Name="System.Management, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" %>
<%@ Import namespace= "System.Management"%>

<script runat="server">    
    protected void Page_Load(object sender, EventArgs e)
    {
        ConnectionOptions co = new ConnectionOptions(); 
	co.Authentication = AuthenticationLevel.PacketPrivacy; 	
	ManagementPath iisPath = new ManagementPath(); 
	iisPath.NamespacePath = @"root/MicrosoftIISv2"; 
	ManagementScope oms = new ManagementScope(iisPath, co); 
	oms.Connect();  
	ObjectQuery oQuery = new ObjectQuery("select * from IISWebServerSetting"); 
	ManagementObjectSearcher oSearcher = new ManagementObjectSearcher(oms, oQuery); 
	foreach (ManagementObject oreturn in oSearcher.Get()) 
	{     
		Response.Write(oreturn["ServerComment"] + " (" + oreturn["Name"] + ")<br />"); 
	} 
    }


</script>

在foreach (ManagementObject oreturn in oSearcher.Get()) 时报错，页面提示

Provider load failure 
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.Management.ManagementException: Provider load failure 

Source Error: 


Line 14: 	ObjectQuery oQuery = new ObjectQuery("select * from IISWebServerSetting"); 
Line 15: 	ManagementObjectSearcher oSearcher = new ManagementObjectSearcher(oms, oQuery); 
Line 16: 	foreach (ManagementObject oreturn in oSearcher.Get()) 
Line 17: 	{     
Line 18: 		Response.Write(oreturn["ServerComment"] + " (" + oreturn["Name"] + ")<br />"); 
 

[songmag]

找到的那个例子网址：

http://stackoverflow.com/questions/1731794/asp-net-iis-metabase-doesnt-return-all-sites