C#– Record types copy constructor

C# record types are designed to be immutable by default. When using a C# record type, you can create a new instance based on an existing instance using the with expression.

	var character = new Character
	{
	FirstName = "Bart",
	LastName = "Simpson"
	};
	var newCharacter = character with { FirstName = "Homer" };

view raw with.cs hosted with ❤ by GitHub

Behind the scenes the compiler will generate a Clone method that calls a copy constructor:

	internal class Character
	{
	// ...
	[CompilerGenerated]
	public virtual Character <Clone>$()
	{
	return new Character(this);
	}
	[CompilerGenerated]
	protected Character(Character original)
	{
	<FirstName>k__BackingField = original.<FirstName>k__BackingField;
	<LastName>k__BackingField = original.<LastName>k__BackingField;
	}
	}

view raw Character.cs hosted with ❤ by GitHub

Although a default copy constructor is generated for you, you can create your own if you want to:

	public record Character(string FirstName, string LastName)
	{
	protected Character(Character other)
	{
	FirstName = other.FirstName;
	LastName = other.LastName;
	// Do something else
	}
	}

view raw Character.cs hosted with ❤ by GitHub