c# 指定的转换在分配 mshtml.HTMLDocument.frames 时无效

Question

我正在开发 IE BHO，在访问 html 文档中的框架时出现此错误

这是代码。

foreach (SHDocVw.InternetExplorer objExplorer in objShellWins)
{
   if (objExplorer.Document is HTMLDocument)
   {
      objDocument = (mshtml.HTMLDocument)objExplorer.Document;
      mshtml.HTMLDocument doc = (mshtml.HTMLDocument)objExplorer.Document;
      mshtml.FramesCollection frames = (mshtml.FramesCollection)doc.frames;  //Exception at this line
   }
}

这里有什么问题？

Answer 1

好的，我通过在函数调用时设置[STAThread]解决了这个问题