如何根据当前月份排序ArrayList里面1-12个数字

Question

如何根据当前月份排序ArrayList里面1-12个数字比如 当前月份是 5  那么 就是5 4 3 2 1 12 11 10 9 8 7 6 请高手帮助 最好能用到IComparer接口

Answer 1

此文章已经说得很详细了
http://blog.csdn.net/mngzilin/archive/2010/04/24/5525002.aspx

Answer 2

ArrayList arr = new ArrayList();
arr.sort(new StudentComparer());public class StudentComparer : IComparer
{
  public int Compare(object x, object y)
  {
  return x.ZIndex.CompareTo(y.ZIndex);
  }
} 
List<T> t=new List<T>();
t.Sort(delegate( t p1, t p2) { return p1.ID.CompareTo(p2.ID); });

Answer 3

        static void Main(string[] args)
        {
            ArrayList list = new ArrayList();
            for (int i = 1; i <= 12; i++)
                list.Add(i);
            list.Sort(new ojlovecdComparer());
            foreach (int i in list)
                Console.WriteLine(i);
        }        public class ojlovecdComparer : IComparer
        {
            static int monthNow = DateTime.Today.Month;            #region IComparer 成员            public int Compare(object x, object y)
            {
                int x1 = Convert.ToInt32(x);
                int y1 = Convert.ToInt32(y);
                if (x1 == monthNow)
                    return 1;
                else if (y1 == monthNow)
                    return -1;
                else if (x1 < monthNow)
                {
                    if (y1 < monthNow)
                        return y1.CompareTo(x1);
                    else
                        return x1.CompareTo(y1);
                }
                else
                {
                    if (y1 < monthNow)
                        return x1.CompareTo(y1);
                    else
                        return y1.CompareTo(x1);
                }
            }            #endregion
        }