How to convert type int[] to int?[]

Question

I\'m using a linq query to output an int array. But I need to pass this into a method that only accepts int?[].

So after searching on ways to convert int[] to int?[] I

Answer 1

I know that it's not correct answer for your question but there is a bit different solution - if you want to keep order and collection length.

public static class EnumerableExtensions
{
    public delegate bool ParseDelegate(string input, out T value) where T : struct;

    public static T?[] ToNullable(this string[] values, ParseDelegate parseMethod) where T : struct
    {
        IEnumerable cos = values.Select(s =>
        {
            T result;
            if (parseMethod(s, out result))
            {
                return (T?)result;
            }

            return null;
        });

        return cos.ToArray();
    }
}

usage:

var cos = new[] { "1", "", "3", "True" };
int?[] eee= cos.ToNullable(int.TryParse); // 1, null, 3, null
float?[] ada = cos.ToNullable(float.TryParse); // 1, null, 3, null
bool?[] asd3 = cos.ToNullable(bool.TryParse); // null, null, null, true