How to add a range of items to an IList?

Question

There is no AddRange() method for IList.

How can I add a list of items to an IList without iterating through the

Answer 1

You could also write an extension method like this:

internal static class EnumerableHelpers
{
    public static void AddRange(this IList collection, IEnumerable items)
    {
        foreach (var item in items)
        {
            collection.Add(item);
        }
    }
}

Usage:

IList collection = new MyCustomList(); //Or any other IList except for a fixed-size collection like an array
var items = new[] {1, 4, 5, 6, 7};
collection.AddRange(items);

Which is still iterating over items, but you don't have to write the iteration or cast every time you call it.