EN CSharp Keyword init

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C#: init

Handbook C# · Practical Guide

Allows the property to be assigned when the object is initialized, rather than being changed arbitrarily later.

Simple example (Example.cs)

Save this example separately as Example.cs. Run it independently of the other examples on this page.

Example.cs:

// PROJECT-EXAMPLE
var item = new Item { Name = "Ore" };
System.Console.WriteLine(item.Name);
class Item { public required string Name { get; init; } }

Result:

Ore

Syntax

public required string Name { get; init; }

Example 1: simple form

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;

public static class Program
{
    public static async Task Main(string[] args)
    {
        Profile profile = new() { Name = "Archer" };
        Console.WriteLine(profile.Name);
    }
}
public class Profile { public required string Name { get; init; } }

Example 2: another practical form

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;

public static class Program
{
    public static async Task Main(string[] args)
    {
        Item item = new() { Code = 12, Label = "Ore" };
        Console.WriteLine($"{item.Code}:{item.Label}");
    }
}
public class Item { public required int Code { get; init; } public required string Label { get; init; } }

Official source: Microsoft Learn.