C# Web.API Cannot add custom model binder

Question

I have API controller that has one Put method

public class ScheduleExecutionsController : ApiController
{

    public ScheduleExecutionsResponse Put([ModelBinder(typeof(TestBinder))]ScheduleExecutionsRequest requestInfo)
    {
        ....
    }
}

I added a binder class to the project

public class TestBinder : IModelBinder
{
    public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
    {
        return new ScheduleExecutionsRequest();
    }
}

I set 2 breakpoints. First one to the first line of Put method in controller and second to first line of my TestBinder BindModel object. After with Fiddler I send PUT request.

Debugger stops always inside my action but never inside BindModel methof of the binder. It seems that default binder is used. What did I miss to add custom one?

Isn't BindModel supposed to return a bool instead of an object? — vc 74
– vc 74, Commented Apr 6, 2016 at 12:03
no, it should be an object msdn.microsoft.com/fr-fr/library/dd505073(v=vs.118).aspx — Vitalii
– Vitalii, Commented Apr 6, 2016 at 12:05
this link is for the Mvc documentation, the webapi doc is here msdn.microsoft.com/en-us/library/… — vc 74
– vc 74, Commented Apr 6, 2016 at 12:07
Possible duplicate of How do I create a custom model binder using the `BindModel(HttpActionContext actionContext...` signature? — Liam
– Liam, Commented May 18, 2018 at 13:45

Richard · Accepted Answer · 2016-04-06 12:06:35Z

4

Are you using the WebAPI or MVC version of ModelBinderAttribute?

Most of the infrastructure of MVC and WebAPI – filters, binding, etc. – exist in two forms (due to the history of the two libraries). Your WebAPI controllers and actions must use the WebAPI version of these (namespace System.Web.Http or its child namespaces)).

answered Apr 6, 2016 at 12:06

Richard

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1 Comment

Vitalii Over a year ago

Thanks a lot. This was a problem of wrong namespace for IModelBinder at Binder calss and also with Model binder attribute that should look like this [System.Web.Http.ModelBinding.ModelBinder(typeof(TestBinder))]

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