<P>IFeature f1 = pEnumFeature.Next();</P>
<P>IFeatureClass pFeatureClass = (IFeatureClass)f1.Class</P>
<P>ISubtypes pSubtypes;</P>
<P><FONT color=#ff0000>pSubtypes = (ISubtypes)pFeatureClass;</FONT></P>
<P>程序运行到最后一句话出现“指定的转换无效”的错误。我是在C#中写的代码，不知道怎么解决。请各位帮帮忙。</P>
