Models, construindo um aplicativo com Xamarin.Forms

Models.cs

using System;

namespace MonkeyApp.Models
{
    public class BaseModel
    {
        public string Id { get; private set; } = Guid.NewGuid().ToString();
    }
    
    public class Content : BaseModel
    {
        public string Title { get; set; }
        public string Description { get; set; }
        public DateTime PostedIn { get; set; }
        public string ImageUrl { get; set; }
        public string ThumbnailUrl { get; set; }
        public string Url { get; set; }
    }
    
    public class Webcast : Content
    {
        public int Views { get; set; }
    }
}