Sample c# extension method for Trait in php

BaseEntity.cs

public class BaseEntity {
  public Guid Guid { get; set; }
  public int Id { get; set; }
}

BaseEntityExtensions.cs

public class BaseEntityExtensions {
  public static string ToJson(this BaseEntity value) {
  	// logic
  	return JsonSerializer.Serialize(value);
  }
}

Program.cs

class Program {
    static void Main() {
	    var user = new User();
	    var JsonString = user.ToJson();
	    // User: { Guid: "lsdfjs09df038...", Id: 2 }
    }
}

User.cs

public class User : BaseEntity {
  
}