自己照着网上的文档做了个bho,注册的时候一直出现这个问题
类型“bho”具有多个COM注册函数代码如下using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using SHDocVw;
using mshtml;
using System.Runtime.InteropServices;
using Microsoft.Win32;namespace BHO_Gyc.BHO
{
        [   
            ComVisible(true), 
            Guid("8a194578-81ea-4850-9911-13ba2d71efbd"),
            ClassInterface(ClassInterfaceType.None)
        ]
    public class BHO:IObjectWithSite
    {
        WebBrowser webBrowser;
        HTMLDocument document;
     public void OnDocumentComplete(object pDisp,ref object URL)
     {
         //string url = URL as string;
         //object anObject = new object();
         //if (url.IndexOf("about:blank") >= 0)
         //{
         //    return;
         //}
         //if (url.IndexOf("baidu.com") >= 0)
         //{
         //    webBrowser.Navigate("http://www.sohu.com", ref anObject, ref anObject, ref anObject, ref anObject);
         //}
         try
         {
             document = (HTMLDocument)webBrowser.Document;
             foreach (IHTMLInputElement tempElement in document.getElementsByTagName("INPUT"))
             {
                 System.Windows.Forms.MessageBox.Show(tempElement.name != null ? tempElement.name : "it sucks,no name,try id" + ((IHTMLElement)tempElement).id);
             }
         }
         catch(Exception e)
         {
             System.Windows.Forms.MessageBox.Show(e.Message);
         }
     }
     public int SetSite(object site)
     {
         if (site != null)
         {
             webBrowser = (WebBrowser)site;
             webBrowser.DocumentComplete += new DWebBrowserEvents2_DocumentCompleteEventHandler(this.OnDocumentComplete);
         }
         else
         {
             webBrowser.DocumentComplete += new DWebBrowserEvents2_DocumentCompleteEventHandler(this.OnDocumentComplete);
             webBrowser = null;
         }
         return 0;
     }
     public int GetSite(ref Guid guid, out IntPtr ppvsite)
     {
         IntPtr punk = Marshal.GetIUnknownForObject(webBrowser);
         int hr = Marshal.QueryInterface(punk, ref guid, out ppvsite);
         Marshal.Release(punk);
         return hr;
     }
     public static string BHOKEYNAME = "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Explorer\\Browser Helper Objects";
     [ComRegisterFunction]
     public static void RegisterBHO(Type type)
     {
         try
         {
             RegistryKey registryKey = Registry.LocalMachine.OpenSubKey(BHOKEYNAME, true);
             if (registryKey == null)
             {
                 registryKey = Registry.LocalMachine.CreateSubKey(BHOKEYNAME);
             }
             string guid = type.GUID.ToString("B");
             RegistryKey ourkey = registryKey.OpenSubKey(guid);
             if (ourkey == null)
             {
                 ourkey = registryKey.CreateSubKey(guid);
             }
             ourkey.SetValue("Alright", 1);
             registryKey.Close();
             ourkey.Close();
         }
         catch (Exception e)
         {
             System.Windows.Forms.MessageBox.Show(e.Message+"1");
         }
     }
     [ComRegisterFunction]
     public static void UnregisterBHO(Type type)
     {
         RegistryKey registryKey = Registry.LocalMachine.OpenSubKey(BHOKEYNAME, true);
         string guid = type.GUID.ToString("B");
         if (registryKey != null)
         {
             registryKey.DeleteSubKey(guid,false);
         }
     }
    }
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;namespace BHO_Gyc
{
    [
           ComVisible(true),
           InterfaceType(ComInterfaceType.InterfaceIsIUnknown),
           Guid("FC4801A3-2BA9-11CF-A229-00AA003D7352")
       ]
    public interface IObjectWithSite
    {
        [PreserveSig]
        int SetSite([MarshalAs(UnmanagedType.IUnknown)]object site);
        [PreserveSig]
        int GetSite(ref Guid guid, out IntPtr ppvsite);
    }
}