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Editorial Team
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Asked: 2026-06-13T23:34:56+00:00

To clarify… I configure my WebApiConfig like so: config.Formatters.JsonFormatter.SerializerSettings.Binder = new TypeNameSerializationBinder(namespace.{0}, assembly); config.Formatters.JsonFormatter.SerializerSettings.TypeNameHandling

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To clarify…
I configure my WebApiConfig like so:

config.Formatters.JsonFormatter.SerializerSettings.Binder = new TypeNameSerializationBinder("namespace.{0}, assembly");
config.Formatters.JsonFormatter.SerializerSettings.TypeNameHandling = TypeNameHandling.Auto;

This should allow me to bind derived classes to base class.
And binder does work when WebApi serializes objects to JSON, and sends them to client, but when I post them back to server, the binder isn’t used (BindToType method never gets called), and my objects get bound to base class.

When i serialize/deserialize objects manually with this settings it all works fine.

Any ideas?

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1 Answer

  1. Editorial Team

    After some research, I found that this is a bug in ASP.NET Web Api. When the url encoded parameters are parsed, it just creates a new JsonSerializer (without passing global settings).

    I filed it here

    http://aspnetwebstack.codeplex.com/workitem/609

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