如何获取COM对象的类型

Question

我在Visual Studio中引用了一个COM库,因此它为我自动创建了相应的Interop程序集.我想GetType()对这些com对象做一个,但它们总是返回System.__ComObject.查询它们的接口有效:

bool isOfType = someComeObject is ISomeComObject; //this works

但我真正想要的是返回com对象的实际类型:

Type type = someComeObject.GetType(); //returns System.__ComObject :-(

有谁知道怎么做我想做的事情？

Answer 1

添加引用Microsoft.VisualBasic.dll然后:

Microsoft.VisualBasic.Information.TypeName(someCOMObject)

MSDN 在这里参考.

Answer 2

达林接受的答案需要依赖Microsoft.VisualBasic.dll.如果你不想拥有它,你可以使用这个简单的助手类:

public static class TypeInformation
{
    public static string GetTypeName(object comObject)
    {
        var dispatch = comObject as IDispatch;

        if (dispatch == null)
        {
            return null;
        }

        var pTypeInfo = dispatch.GetTypeInfo(0, 1033);

        string pBstrName;
        string pBstrDocString;
        int pdwHelpContext;
        string pBstrHelpFile;
        pTypeInfo.GetDocumentation(
            -1, 
            out pBstrName, 
            out pBstrDocString, 
            out pdwHelpContext, 
            out pBstrHelpFile);

        string str = pBstrName;
        if (str[0] == 95)
        {
            // remove leading '_'
            str = str.Substring(1);
        }

        return str;
    }

    [ComImport]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    [Guid("00020400-0000-0000-C000-000000000046")]
    private interface IDispatch
    {
        int GetTypeInfoCount();

        [return: MarshalAs(UnmanagedType.Interface)]
        ITypeInfo GetTypeInfo(
            [In, MarshalAs(UnmanagedType.U4)] int iTInfo,
            [In, MarshalAs(UnmanagedType.U4)] int lcid);

        void GetIDsOfNames(
            [In] ref Guid riid,
            [In, MarshalAs(UnmanagedType.LPArray)] string[] rgszNames,
            [In, MarshalAs(UnmanagedType.U4)] int cNames,
            [In, MarshalAs(UnmanagedType.U4)] int lcid,
            [Out, MarshalAs(UnmanagedType.LPArray)] int[] rgDispId);
    }
}