convert list<int> to list<long>

Question

How to convert List<int> to List<long> in C#?

Answer 1

Like this:

List<long> longs = ints.ConvertAll(i => (long)i);

This uses C# 3.0 lambda expressions; if you're using C# 2.0 in VS 2005, you'll need to write

List<long> longs = ints.ConvertAll<int, long>(
    delegate(int i) { return (long)i; }
);

Answer 2

var longs = ints.Cast<long>().ToList();

Answer 3

List<int> ints = new List<int>();
List<long> longs = ints.Select(i => (long)i).ToList();