Name for the "AddRange" collection initializer? [duplicate]

Question

There's a C# feature which I don't know the term for, and as such haven't been able to find documentation on it.

What is the name for the "AddRange-like" syntax that lets you add elements to a collection during initialization? I'm referring specifically to the case documented in the code below, where we are not calling the constructor (and are unable to due to the property not having a setter), but instead seem to just be calling AddRange on the collection.

using System;
using System.Collections.Generic;

public class Program
{
    public static void Main(string[] args)
    {
        TestClass a = new TestClass()
        {
            // What is the name for this feature??
            List =
            {
                0,
                10,
                20,
                30
            }
        };
        Console.WriteLine(a.List.Count);
    }

    public class TestClass
    {
        private List<int> _list = new List<int>();
        public List<int> List { get { return _list; } }
    }
}

Also, am I understanding the semantics of this syntax correctly? It is just allowing us a to shorthand AddRange/multiple-Add syntax on a collection, correct?

.NET Fiddle here, should anyone want to run the sample code: https://dotnetfiddle.net/i01HYv

Answer 1

Its the Object Initializer or Collection Initializer syntax introduced in C# 3.0