using System.Text.Json; using System.Text.Json.Serialization; namespace View_by_Distance.Shared.Models; public class PersonBirthday : Properties.IPersonBirthday { protected readonly DateTime _Value; // {{1}}SingletonValue public DateTime Value => _Value; // {{1}}SingletonValue [JsonConstructor] public PersonBirthday ( DateTime value ) => _Value = value; // {{1}}SingletonValue public override string ToString() { string result = JsonSerializer.Serialize(this, new JsonSerializerOptions() { WriteIndented = true }); return result; } // ... }