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

Check if JsonProperty attribute is set on the fields that come as null - it could be that they are mapped to different json property-names.

Answer 2

I had this problem in my .NET Framework Web API, because my model existed in a .NET Standard project that referenced a different version of data annotations.

Adding the ReadAsAsync line below highlighted the cause for me:

public async Task<HttpResponseMessage> Register(RegistrationDetails registrationDetails)
{
    var regDetails = await Request.Content.ReadAsAsync<RegistrationDetails>();