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Editorial Team
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Asked: 2026-05-25T10:06:24+00:00

In Python, when I want to use this COM object, all I do is

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In Python, when I want to use this COM object, all I do is win32com.client.Dispatch("Myapp.Thing.1") and it gives me an object which I can call methods and such on.

I want to do this in C# and, shockingly, I can’t seem to figure out how. I do not want to use one of those automatically generated COM wrappers, for reasons I can’t get into. I need to do the late binding, dynamic COM of times past.

I’ve tried doing this, but I get a Null Ref Exception on the invoke call. 

Type t = Type.GetTypeFromProgID("Myapp.Thing.1")
o = Activator.CreateInstance(t) 
t.GetMethod("xyz").Invoke(o, args)

Any example code that is able to load up a COM object by its name and use it in some basic manner would be ideal.

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1 Answer

  1. Editorial Team

    When your type is retrieved via GetTypeFromProgID, You don’t actually have the type – you have a __ComObject type which wraps the COM object created – so it doesn’t have method “xyz” on it. Hence your null reference exception – GetMethod("xyx") is returning null.

    In order to invoke the method, use t.InvokeMember("xyz", BindingFlags.InvokeMethod, null, o, args) instead:

    Type t = Type.GetTypeFromProgID("Myapp.Thing.1")
o = Activator.CreateInstance(t) 
t.InvokeMember("xyz", BindingFlags.InvokeMethod, null, o, args)
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