web-api POST body object always null

Question

I\'m still learning web API, so pardon me if my question sounds stupid.

I have this in my StudentController:

public HttpResponseMessage          


        

Answer 1

Seems like there can be many different causes of this problem...

I found that adding an OnDeserialized callback to the model class caused the parameter to always be null. Exact reason unknown.

using System.Runtime.Serialization;

// Validate request
[OnDeserialized]  // TODO: Causes parameter to be null
public void DoAdditionalValidatation() {...}