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Asked: 2026-05-14T23:52:03+00:00

I have a class with an IList<T> property decorated with the [ImportMany(allowRecomposition = true)]

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I have a class with an IList<T> property decorated with the [ImportMany(allowRecomposition = true)] attribute. There are some conditions in which the application might not find any available Exports of the requested type. Right now, it’s throwing a CompositionException if no Exports of the requested type are found. I dislike application flow being determined by thrown exceptions, so I would rather not catch and react in this case. Rather, I just want program execution to continue.

Is there a flag or something I can set to make this Import optional? I know for single import properties, you can do this: [Import(AllowDefault = true)] but ‘AllowDefault‘ is not an option on the ImportMany attribute.

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1 Answer

  1. Editorial Team

    There most be something else failing because by definition ImportMany will allow zero or more items, so if there isn’t a value it will not cause any errors.

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