// @nuget: protobuf-net

​

using System;

using ProtoBuf;

using System.Collections.Generic;

​

[ProtoContract]

[ProtoInclude(2, typeof(Point))]

[ProtoInclude(3, typeof(Line))]

class Geometry

{

    [ProtoMember(1)]

    string Name { get; set; }

}

​

[ProtoContract]

class Point : Geometry

{

    [ProtoMember(1)]

    float X { get; set; }

    [ProtoMember(2)]

    float Y { get; set; }

}

​

[ProtoContract]

class Line : Geometry

{

    [ProtoMember(1)]

    List<Point> Points { get; set; }

}

​

[ProtoContract]

class Feature

{

    [ProtoMember(1)]

    Geometry Geo { get; set; }

}

public class Program

{

    public static void Main()

    {

        Console.WriteLine(Serializer.GetProto<Geometry>());

    }

}