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Editorial Team
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Asked: 2026-05-14T18:57:43+00:00

I create a number of add-ins for the Revit Structure API. Each tool has

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I create a number of add-ins for the Revit Structure API. Each tool has to habe a class which implements the interface IExternalCommand.

In the latest version of Revit, for your tool to work you need to have two attributes on the class that implements that interface:

[Regeneration(RegenerationOption.Manual)]
[Transaction(TransactionMode.Automatic)]

The values in brackets can change, but there must be something there. Often I am finding myself forgetting to put the attributes on, then when it comes to runtime it crashes. Is there any way in Visual Studio 2010 to add a compiler warning or error saying that if your class implements that interface it must have those 2 attributes? I have resharper if that helps.

Can anyone point me into the right direction?

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  1. Editorial Team

    Unfortunately not. (I don’t know about Resharper, though)

    If you have VS2010 Ultimate, you could write a custom Code Analysis rule.

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