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Editorial Team
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Asked: 2026-05-30T20:01:49+00:00

I can create COM object locally var infsrv = new InfoServ.TInfoServerClass(); //COM object infsrv.RunBsScript(bssScriptName,

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I can create COM object locally

var infsrv = new InfoServ.TInfoServerClass(); //COM object
infsrv.RunBsScript(bssScriptName, strOfParam); //calling method

But I needed to create COM object on server, so code is:

var myGuid = new Guid("00C4261D-0B2B-4230-A2CA-A9F4F2A46452");
var myType = Type.GetTypeFromCLSID(myGuid, servername);
InfoServ.TInfoServerClass infsrv = (InfoServ.TInfoServerClass)Activator.CreateInstance(myType);
infsrv.RunBsScript(bssScriptName, strOfParam);

but now it says:

Unable to cast COM object of type ‘System.__ComObject’ to class type
‘InfoServ.TInfoServerClass’. COM components that enter the CLR and do
not support IProvideClassInfo or that do not have any interop assembly
registered will be wrapped in the __ComObject type. Instances of this
type cannot be cast to any other class; however they can be cast to
interfaces as long as the underlying COM component supports
QueryInterface calls for the IID of the interface.

what should I do?

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1 Answer

  1. Editorial Team

    You should be able to cast the instance created by the call to Activator.CreateInstance to an interface.

    You should have an interface defined in the Interop assembly named InfoServ.TInfoServer (or ITInfoServer if the type library explicitly defined an interface for it), and if you cast the object returned by Activator.CreateInstance to that interface, you should see all of the methods/properties the CoClass (TInfoServerClass) exposes.

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