Easier way to get the default property?

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Chad Myers - 23 Sep 2004 22:15 GMT

I have a .NET class that's COMVisible(true) and it has a method
that takes an object (VARIANT*) argument.

I'm running into a problem where an ASP/JScript client is
passing a Request.QueryString("foo") result into this argument.

Request.QueryString("foo") returns an IStringList which is not
marshable in .NET by default.

I have to assume that users could pass in any type of data
into my method, so if .NET couldn't marshal it and gives me a
System.__ComObject, then I do all the IDispatch stuff to invoke
the default property (DISPID 0).

Is there an easier (read: built in) way of getting the default
property from a __ComObject?

Thanks,
Chad

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Robert Jordan - 23 Sep 2004 23:34 GMT

> I have a .NET class that's COMVisible(true) and it has a method
> that takes an object (VARIANT*) argument.
[quoted text clipped - 12 lines]
> Is there an easier (read: built in) way of getting the default
> property from a __ComObject?

Via reflection (which in turn uses IDispatch):

comObject.GetType().InvokeMember(
"", // -> default member
BindingFlags.InvokeMethod,
null,
comObject,
null
);

bye
Rob

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Chad Myers - 24 Sep 2004 00:01 GMT

> > <snip>
> >
[quoted text clipped - 10 lines]
> null
> );

So much simpler! Thank you for the quick reply.

Works like a champ.

Thanks again,
Chad

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Easier way to get the default property?

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