Cast List to List in .NET 2.0

Question

Can you cast a List to List somehow?

I know I could loop through and .ToString() the thing, but a cast would be aw

Answer 1

Updated for 2010

List<int> l1 = new List<int>(new int[] { 1,2,3 } );
List<string> l2 = l1.ConvertAll<string>(x => x.ToString());

Answer 2

.NET 2.0 has the ConvertAll method where you can pass in a converter function:

List<int>    l1 = new List<int>(new int[] { 1, 2, 3 } );
List<string> l2 = l1.ConvertAll<string>(delegate(int i) { return i.ToString(); });

Answer 3

You have to build a new list. The underlying bit representations of List<int> and List<string> are completely incompatible -- on a 64-bit platform, for instance, the individual members aren't even the same size.

It is theoretically possible to treat a List<string> as a List<object> -- this gets you into the exciting worlds of covariance and contravariance, and is not currently supported by C# or VB.NET.

Answer 4

Is C# 2.0 able to do List<T>.Convert? If so, I think your best guess would be to use that with a delegate:

List<int> list = new List<int>();
list.Add(1);
list.Add(2);
list.Add(3);
list.Convert(delegate (int i) { return i.ToString(); });

Something along those lines.

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Upvote Glenn's answer, which is probably the correct code ;-)

Answer 5

result = listOfInt.Select(i => i.ToString(CultureInfo.InvariantCulture)).ToList()

replace the parameters result and listOfInt to your parameters

Answer 6

You can use:

List<int> items = new List<int>(new int[] { 1,2,3 } );
List<string> s = (from i in items select i.ToString()).ToList();