问将序列元素划分成对

EN

class Program
{
    static void Main(string[] args)
    {
        int size = 8;

        List<int> tmpList = new List<int>();

        for (int i = size; i <= size * 2; i++)
        {
            tmpList.Add(i);
        }

        List<Pair> result = new List<Pair>();

        Random r = new Random();

        for (int i = 1; i <= size; i++)
        {
            Pair pair = new Pair() { a = i, b = PopRandom(r, tmpList) };
            result.Add(pair);
        }

        foreach (Pair p in result)
        {
            Console.WriteLine("{0} - {1}", p.a, p.b);
        }
    }

    static private int PopRandom(Random r, List<int> list)
    {
        int i = r.Next(0, list.Count);
        int result = list[i];

        list.RemoveAt(i);

        return result;
    }

    struct Pair
    {
        public int a;
        public int b;
    }
}

var result = new List<Tuple<int,int>>();

for (int i = 1; i < size; i+=2 )
{
   var pair = new Tuple.Create(i,i+1);
   result.Add(pair);   
}