一：C#ActiveX控件開發注意事項
1:C#開發的ActiveX控件只可在裝有Framework的系統上才能用。2:只有IE瀏覽器支持。3:初次安裝需要導入代碼簽名證書及其證書鏈的方式,或者Windows其實默認內置了一些權威的CA機構證書，可以向這些機構申請一份代碼簽名證書及私鑰文件來對ActiveX控件簽名，這樣就可以避免該問題了。但是，向權威的CA機構申請證書是需要付費的，所以需要權衡成本和易用性后，再做出選擇。二：開發步驟
ActiveX控件以前也叫做OLE控件，它是微軟IE支持的一種軟件組件或對象，可以將其插入到Web頁面中，實現在瀏覽器端執行動態程序功能，以增強瀏覽器端的動態處理能力。通常ActiveX控件都是用C++或VB語言開發，本文介紹另一種方式，在.NET Framework平臺上，使用C#語言開發ActiveX控件。1:必須繼承并實現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：通常我們會先定義這么一個控件基類去實現改接口
ActiveXControl控件基類
public abstract class ActiveXControl : IObjectSafety
{
#region IObjectSafety 成員
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:
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