using System;

using Newtonsoft.Json;

​

public class Program

{

    public static void Main()

    {

        var b = new B()

        {NormalPropery = "random value should be visible", PartitionKeyAlias = "this should not appear"};

        var json = JsonConvert.SerializeObject(b);

        Console.WriteLine("Hello World");

        Console.WriteLine(json);

    }

}

​

public abstract class A

{

    public string NormalPropery

    {

        get;

        set;

    }

​

    [JsonIgnore]

    public abstract string PartitionKeyAlias

    {

        get;

        set;

    }

}

​

public class B : A

{

    public override string PartitionKeyAlias

    {

        get;

        set;

    }

}