C# list中ConvertAll的使用

static double TakeSquareRoot(int x)
{
    //return Math.Sqrt(x);
    return x + 1;
}

static void Main(string[] args)
{
    List<int> integers = new List<int>();
    integers.Add(1);
    integers.Add(2);
    integers.Add(3);
    integers.Add(4);

    Converter<int, double> converter = TakeSquareRoot;
    List<double> doubles;
    doubles = integers.ConvertAll<double>(converter);
    foreach (double d in doubles)
    {
        Console.WriteLine(d);
    }

    Console.WriteLine("OK");

    Console.ReadKey();
}