COM & static member function

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gk - 31 Aug 2006 22:17 GMT

Hi,

in a .NET class I wish to use from a COM client, I have a static member
function "LoadFromFile" that returns an instance of that class:

class Myclass : MyclassCOMinterface
{
static Myclass LoadFromFile(string file) {...}
}

since static members are not visible by COM, how can I expose
"LoadFromFile"? Or is there another solution?

thanks for help

gk

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Mattias Sjögren - 03 Sep 2006 02:20 GMT

>since static members are not visible by COM, how can I expose
>"LoadFromFile"? Or is there another solution?

Provide another class with an instance method that calls the static
method. Something like

class MyclassFactory
{
    public Myclass LoadFromFile(string file)
    {
        return Myclass.LoadFromFile(file);
    }
}

or use Reflection from the COM client. Static methods can't be exposed
directly to COM.

Mattias

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Mattias Sjögren [C# MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
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gk - 05 Sep 2006 16:13 GMT

>> since static members are not visible by COM, how can I expose
>> "LoadFromFile"? Or is there another solution?
[quoted text clipped - 14 lines]
>
> Mattias

ok thanks for the advice.

another problem showed up:

The factory returns a MyClass object. In my project, MyClass implements
2 interfaces. When I run the LoadFromFile method, it returns the default
interface, but not the object itself. This means I cannot access the
second interface. Is this normal behaviour?

gk

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COM & static member function

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