EnumerableExtensions

EnumerableExtensions.cs

public static class EnumerableExtensions
{
    public static bool TryGetFirstValue<T>(this IEnumerable<T> source, out T value)
    {
        if (source == null)
            throw new ArgumentNullException(nameof(source));

        //is a list?
        if (source is IList<T> col)
        {
            if (col.Count == 0)
            {
                value = default;
                return false;
            }

            value = col[0];
            return true;
        }

        //enumerate
        using (var e = source.GetEnumerator())
        {
            if (!e.MoveNext())
            {
                value = default;
                return false;
            }

            value = e.Current;
            return true;
        }
    }
}