Ignore property when converting object to json string

Question

So i have a REST API that works with a JSON based on OData exchange. In a OData type there is a ID property i want to read so i can do some checking on it. However when i want to write back to the webserver the ID property must not be present in the response JSON string. So it has to be a write-only property, but simply changing a property to write-only prevents be to check what the value is of that property.

For example, i create a new product:

Public Class Product
  Public property ID as integer
  Public property Title as string
End class

GET response:

{
  "ID" = 1,
  "Title" = "Cool product!"
}

POST Wrong:

{
  "ID" = 1, <---- ignore this value
  "Title" = "Cool product! Changed!"
}

POST Should be:

{
  "Title" = "Cool product! Changed!"
}

The webserver uses OData

Using the attribute JsonIgnoredoesn't fix it because the value of the REST response isn't serialized then.

This is for WPF and not ASP.Net

Answer 1

JSON.NET supports conditional property serialization using a method that returns a bool and has the same name as the property with a ShouldSerialize prefix:

public class Product
{
    public int Id { get; set; }
    public string Title { get; set; }

    public bool ShouldSerializeId() => false;

}