关键利用KeyValuePair。
定义一个Dictionary：
Dictionary<int,Point> aggUpGroupPointDic = new Dictionary<int, Point>();
遍历它：
foreach (KeyValuePair<int,Point>keyValuePair inaggDownGroupPointDic)
{
Console.WriteLine(“Point{0}’s position is ({1}，{2})”,keyValuePair.Key,keyValuePair.Value.X,keyValuePair.Value.Y);
}