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Editorial Team
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Asked: 2026-05-23T11:59:03+00:00

I have a requirement to bind an entity of type ‘Field’ which has a

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I have a requirement to bind an entity of type ‘Field’ which has a List as a property. The list will have mixed types of behaviour, but all inherit from Behaviour. I need the list to bind with the correct derived types so they can be persisted correctly.

I am using a technique used in the DerivedTypesModelBinder in the MvcContrib library, whereby I have a property on each of my entities which holds the type that needs to be created. The field is called ‘XxModelTypexX’.

My problem is, I am not sure how to change the type of a property in a custom model binder. Every time I try it simply binds a generic list of Behaviours.

Any help would be appreciated.

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1 Answer

  1. Editorial Team

    Ok, so I figured it out. Basically even though the list of Behaviour is a property on Field, you still have to add that to the list of types that use the custom model binder in the Global.asax file

    System.Web.Mvc.ModelBinders.Binders.Add(typeof(Types.Behaviour), new ConcreteTypeModelBinder());

    With this line in place the type changing code I had worked a treat.

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