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

Maybe for someone it will be helpful: check the access modifiers for your DTO/Model class' properties, they should be public. In my case during refactoring domain object internals were moved to DTO like this:

// Domain object
public class MyDomainObject {
    public string Name { get; internal set; }
    public string Info { get; internal set; }
}
// DTO
public class MyDomainObjectDto {
    public Name { get; internal set; } // <-- The problem is in setter access modifier (and carelessly performed refactoring).
    public string Info { get; internal set; }
}

DTO is being finely passed to client, but when the time comes to pass the object back to the server it had only empty fields (null/default value). Removing "internal" puts things in order, allowing deserialization mechanizm to write object's properties.

public class MyDomainObjectDto {
    public Name { get; set; }
    public string Info { get; set; }
}