如何将HtmlAgilityPack.HtmlDocument对象转换为IHTMLDocument2对象

Question

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**使用HtmlAgilityPack;       使用mshtml;

 HtmlAgilityPack.HtmlDocument obj = new HtmlAgilityPack.HtmlDocument();
IHTMLDocument2 obj1;
obj = (IHTMLDocument2)obj1;**