C# Feature – Required members

Overview

required enforces that specified members must be set during object initialization.

C# 11 (2022)

public class User { public string Email { get; set; } /* risk of missing init */ }

public class User { public required string Email { get; init; } }
var u = new User { Email = "a@b.com" }; // required

public record Customer(string Id)
{
  public required string Name { get; init; }
}