Extend Collection Initializers to Collections via multiple Adds or AddRange

[TonyValenti]

It would be great if I could do:

var Array1 = new[]{1,2,3,4,5};
var Array2 = new[]{6,7,8,9,0};
var List3 = new List<int>(){
  Array1, Array2
};

[alrz]

You can use an extension method for that:

public static void Add<T>(this List<T> list, IEnumerable<T> items) => list.AddRange(items);

[TonyValenti]

@alrz - Yes, this is what I do today but I think that is such a common scenerio it should be natively supported.

[Unknown6656]

I think that this should be part of https://github.com/dotnet/runtime, as it does not require a language syntax change....