C#开发ActiveX控件教程

楼主之前做的一个项目，用到第三方控件，恰巧这个第三方控件就是ActiveX控件。
今天刚好看到博客园有这个教程，转载来分享下。

一：C#ActiveX控件开发注意事项

1:C#开发的ActiveX控件只可在装有Framework的系统上才能用。
2:只有IE浏览器支持。
3:初次安装需要导入代码签名证书及其证书链的方式,
或者Windows其实默认内置了一些权威的CA机构证书，可以向这些机构申请一份代码签名证书及私钥文件来对ActiveX控件签名，这样就可以避免该问题了。但是，向权威的CA机构申请证书是需要付费的，所以需要权衡成本和易用性后，再做出选择。

二：开发步骤

    ActiveX控件以前也叫做OLE控件，它是微软IE支持的一种软件组件或对象，可以将其插入到Web页面中，实现在浏览器端执行动态程序功能，以增强浏览器端的动态处理能力。通常ActiveX控件都是用C++或VB语言开发，本文介绍另一种方式，在.NET Framework平台上，使用C#语言开发ActiveX控件。

[C#] 纯文本查看 复制代码

1:必须继承并实现IObjectSafety接口

    [ComImport, GuidAttribute("CB5BDC81-93C1-11CF-8F20-00805F2CD064")]
    [InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IObjectSafety
    {
        [PreserveSig]
        int GetInterfaceSafetyOptions(ref Guid riid, [MarshalAs(UnmanagedType.U4)] ref int pdwSupportedOptions, [MarshalAs(UnmanagedType.U4)] ref int pdwEnabledOptions);
 
        [PreserveSig()]
        int SetInterfaceSafetyOptions(ref Guid riid, [MarshalAs(UnmanagedType.U4)] int dwOptionSetMask, [MarshalAs(UnmanagedType.U4)] int dwEnabledOptions);
    }
 
2：通常我们会先定义这么一个控件基类去实现改接口

 
ActiveXControl控件基类
  public abstract class ActiveXControl : IObjectSafety
 {
     #region IObjectSafety 成员
     private const string _IID_IDispatch = "{00020400-0000-0000-C000-000000000046}";
     private const string _IID_IDispatchEx = "{a6ef9860-c720-11d0-9337-00a0c90dcaa9}";
     private const string _IID_IPersistStorage = "{0000010A-0000-0000-C000-000000000046}";
     private const string _IID_IPersistStream = "{00000109-0000-0000-C000-000000000046}";
     private const string _IID_IPersistPropertyBag = "{37D84F60-42CB-11CE-8135-00AA004BB851}";
 
     private const int INTERFACESAFE_FOR_UNTRUSTED_CALLER = 0x00000001;
     private const int INTERFACESAFE_FOR_UNTRUSTED_DATA = 0x00000002;
     private const int S_OK = 0;
     private const int E_FAIL = unchecked((int)0x80004005);
     private const int E_NOINTERFACE = unchecked((int)0x80004002);
 
     private bool _fSafeForScripting = true;
     private bool _fSafeForInitializing = true;
 
 
     public int GetInterfaceSafetyOptions(ref Guid riid, ref int pdwSupportedOptions, ref int pdwEnabledOptions)
     {
         int Rslt = E_FAIL;
 
         string strGUID = riid.ToString("B");
         pdwSupportedOptions = INTERFACESAFE_FOR_UNTRUSTED_CALLER | INTERFACESAFE_FOR_UNTRUSTED_DATA;
         switch (strGUID)
         {
             case _IID_IDispatch:
             case _IID_IDispatchEx:
                 Rslt = S_OK;
                 pdwEnabledOptions = 0;
                 if (_fSafeForScripting == true)
                     pdwEnabledOptions = INTERFACESAFE_FOR_UNTRUSTED_CALLER;
                 break;
             case _IID_IPersistStorage:
             case _IID_IPersistStream:
             case _IID_IPersistPropertyBag:
                 Rslt = S_OK;
                 pdwEnabledOptions = 0;
                 if (_fSafeForInitializing == true)
                     pdwEnabledOptions = INTERFACESAFE_FOR_UNTRUSTED_DATA;
                 break;
             default:
                 Rslt = E_NOINTERFACE;
                 break;
         }
 
         return Rslt;
     }
 
     public int SetInterfaceSafetyOptions(ref Guid riid, int dwOptionSetMask, int dwEnabledOptions)
     {
         int Rslt = E_FAIL;
 
         string strGUID = riid.ToString("B");
         switch (strGUID)
         {
             case _IID_IDispatch:
             case _IID_IDispatchEx:
                 if (((dwEnabledOptions & dwOptionSetMask) == INTERFACESAFE_FOR_UNTRUSTED_CALLER) &&
                         (_fSafeForScripting == true))
                     Rslt = S_OK;
                 break;
             case _IID_IPersistStorage:
             case _IID_IPersistStream:
             case _IID_IPersistPropertyBag:
                 if (((dwEnabledOptions & dwOptionSetMask) == INTERFACESAFE_FOR_UNTRUSTED_DATA) &&
                         (_fSafeForInitializing == true))
                     Rslt = S_OK;
                 break;
             default:
                 Rslt = E_NOINTERFACE;
                 break;
         }
 
         return Rslt;
     }
     #endregion
 }