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I am trying to post multiple parameters on a WebAPI controller. One param is from the URL, and the other from the body. Here is the url: /offers/40D5E19D-0CD5-4FBD-92F8-43FDBB475333/prices/ Here is my controller code: public HttpResponseMessage Put(Guid offerId, OfferPriceParameters offerPriceParameters) { //What!? var ser = new DataContractJsonSerializer(typeof(OfferPriceParameters)); HttpContext.Current.Request.InputStream.Position = 0; var what = ser.ReadObject(HttpContext.Current.Request.InputStream); return new HttpResponseMessage(HttpStatusCode.Created); } The content of the body is in JSON: { "Associations": { "list": [ { "FromEntityId":"276774bb-9bd9-4bbd-a7e7-6ed3d69f196f", "ToEntityId":"ed0d2616-f707-446b-9e40-b77b94fb7d2b", "Types": { "list":[ { "BillingCommitment":5, "BillingCycle":5, "Prices": { "list":[ { "CurrencyId":"274d24c9-7d0b-40ea-a936-e800d74ead53", "RecurringFee":4, "SetupFee":5 }] } }] } }] } } Any idea why the default binding is not able to bind to the offerPriceParameters argument of my controller? It is always set to null. But I am able to recover the data from the body using the DataContractJsonSerializer . I also try to use the FromBody attribute of the argument but it does not work either.

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