C#开发BHO插件

用c#编译一个简单的BHO插件，修改百度首页按钮“百度一下”的值为“修改一下”：
BHO.cs如下：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using SHDocVw;
using mshtml;
using System.IO;
using Microsoft.Win32;
using System.Runtime.InteropServices;

namespace BHO.BHO
{
    [
    ComVisible(true),
    Guid("8a194578-81ea-4850-9911-13ba2d71efbd"),
    ClassInte易做图ce(ClassInte易做图ceType.None)
    ]
    public class BHO : IObjectWithSite
    {

        WebBrowser webBrowser;
        HTMLDocument document;

        public void OnDocumentComplete(object pDisp, ref object URL)
        {

            document = (HTMLDocument)webBrowser.Document;

            foreach (IHTMLInputElement tempElement in document.getElementsByTagName("INPUT"))
            {
                if (document.url == "http://www.baidu.com/" && tempElement.type.ToLower() == "button" && ((IHTMLElement)tempElement).id == "su")
                {
                    tempElement.value = "改变一下";

                }
                    }

        }

        #region BHO Internal Functions
        public static string BHOKEYNAME = "Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\Browser Helper Objects";

        [ComRegisterFunction]
        public static void RegisterBHO(Type type)
        {
            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();
        }

        [ComUnregisterFunction]
        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);
        }

        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.QueryInte易做图ce(punk, ref guid, out ppvSite);
            Marshal.Release(punk);

            return hr;
        }

        #endregion

    }
}

IObjectWithSIte.cs代码如下：
using System;
using System.Collections.Generic;
using System.Text;

using System.Runtime.InteropServices;

namespace BHO_HelloWorld
{

    [
    ComVisible(true),
    Inte易做图ceType(ComInte易做图ceType.Inte易做图ceIsIUnknown),
    Guid("e7b9b609-19ad-40a4-a288-b300a3087464")
    ]

        public inte易做图ce IObjectWithSite
        {
            [PreserveSig]
            int SetSite([MarshalAs(UnmanagedType.IUnknown)]object site);
            [PreserveSig]
            int GetSite(ref Guid guid, out IntPtr ppvSite);
        }

}
生成了BHO.dll,生成时出现了无法启动带有“类库输出类型”的项目。
然后我用regsvr32 D:\BHO.dll注册dll文件，出现问题了“模块“d:\BHO.dll”已加载，但找不到入口点DllRegisterServer"，初学bho，希望大家能多多指教啊，也希望大神能帮忙解决下。
--------------------编程问答-------------------- 好长的代码啊！
有点不懂啊！ --------------------编程问答-------------------- C# 用 RegAsm 注册
regasm /codebase BHO.dll --------------------编程问答-------------------- 测试了一下，没有实现功能啊！

补充：.NET技术 ,  其他语言