public class PublicMenu : BaseEntity
    {
        public PublicMenu()
        {
            SubMenus = new List<PublicMenu>();
        }

        public string Title { get; set; }
        public string Url { get; set; }
        public string Icon { get; set; }
        public bool IsShow { get; set; }

        public virtual PublicMenu Menu { set; get; }
        public int? MenuId { get; set; }
        public ICollection<PublicMenu> SubMenus { get; set; }
    }

·قسمتی از Application است که Domain Logic را پیاده سازی می‌کند.

·همچنین با عنوان Business Logic نیز شناخته می‌شود. 

 public void ConfigureServices(IServiceCollection services)
 {
     services.AddControllers()
            .AddNewtonsoftJson()
     // ...
}

public class Person
{
   public string FirstName { get; set; }
   public string LastName { get; set; }
   public DateTime? BirthDay { get; set; }
}

using System;
using System.Text.Json.Serialization;

namespace ConsoleApp
{
    class Program
    {
        static void Main(string[] args)
        {
            Person person = JsonSerializer.Parse<Person>(...);
            string json = JsonSerializer.ToString(person);
        }
    }
}

namespace System.Text.Json.Serialization
{
    public static class JsonSerializer
    {
        public static object Parse(ReadOnlySpan<byte> utf8Json, Type returnType, JsonSerializerOptions options = null);
        public static object Parse(string json, Type returnType, JsonSerializerOptions options = null);
        public static TValue Parse<TValue>(ReadOnlySpan<byte> utf8Json, JsonSerializerOptions options = null);
        public static TValue Parse<TValue>(string json, JsonSerializerOptions options = null);

        public static string ToString(object value, Type type, JsonSerializerOptions options = null);
        public static string ToString<TValue>(TValue value, JsonSerializerOptions options = null);
    }
}

public sealed class JsonSerializerOptions
{
   public bool AllowTrailingCommas { get; set; }
   public int DefaultBufferSize { get; set; }
   public JsonNamingPolicy DictionaryKeyPolicy { get; set; }
   public bool IgnoreNullValues { get; set; }
   public bool IgnoreReadOnlyProperties { get; set; }
   public int MaxDepth { get; set; }
   public bool PropertyNameCaseInsensitive { get; set; }
   public JsonNamingPolicy PropertyNamingPolicy { get; set; }
   public JsonCommentHandling ReadCommentHandling { get; set; }
   public bool WriteIndented { get; set; }
}

// Json.NET:
var settings = new JsonSerializerSettings
{
    NullValueHandling = NullValueHandling.Ignore
};
string json = JsonConvert.SerializeObject(person, settings);

// JsonSerializer:
var options = new JsonSerializerOptions
{
    IgnoreNullValues = true
};
string json = JsonSerializer.ToString(person, options);

services.AddControllers()
   .AddJsonOptions(options => options.JsonSerializerOptions.WriteIndented = true);

[JsonPropertyName("birthdate")]
public DateTime? BirthDay { get; set; }

var options = new JsonSerializerOptions
{
   PropertyNamingPolicy = JsonNamingPolicy.CamelCase
};
string json = JsonSerializer.ToString(person, options);

public class Person 
{ 
    public string _firstName; 
 
    public string FirstName 
    { 
        get 
        { 
            return _firstName; 
        } 
        set 
        { 
            _firstName = value; 
        } 
    }  
}

public string _firstName; 
public string FirstName 
{ 
    get 
    { 
        return _firstName; 
    } 
    private set 
    { 
        _firstName = value; 
    } 
}

public class Person
{
   public string FirstName { get; set; }
}

public class User
{
   public string Name { get; private set; }
}

public class User
{
   public string Name { get; }
}

public class Foo
{
   public string FirstName { get; set; } = "Initial Value";
}

public class Foo
{  
   public DateTime DateOfBirth { get; set; }
   public int Age => DateTime.Now.Year - DateOfBirth.Year;  
}

public class User
{
   public string Name { get; private set; }
}

var user = new User
{
   Name = "User 1" // Compile Error
};

The property or indexer 'User.Name' cannot be used in this context
because the set accessor is inaccessible [CS9Features]csharp(CS0272)

public class User
{
  public User(string name)
  {
    this.Name = name;
  }

  public void SetName(string name)
  {
    this.Name = name;
  }

  public string Name { get; private set; }
}

public class User
{
   public string Name { get; init; }
}

var user = new User
{
   Name = "User 1"
};

// Compile Time Error
// Init-only property or indexer 'User.Name' can only be assigned in an object initializer,
// or on 'this' or 'base' in an instance constructor or an 'init' accessor. [CS9Features]csharp(CS8852)
user.Name = "Test";

public class User
{
   public string Name { get; init; }

   public User(string name)
   {
     this.Name = name; // Works fine
   }

   public void SetName(string name)
   {
     this.Name = name; // Compile Time Error
   }
}

    public class Product
    {
        public Product(string name)
        {
            _name = name;
        }

        private readonly string _name;

        public string Name => _name;
    }

    public class Person
    {
        private readonly string _name;

        public string Name
        {
            get => _name;
            init => _name = value;
        }
    }