对哈希表按value排序

一般是对Hash标按key排序，但是我现在遇到的是需要按value排序，而且value可能多个是相同的，这里value是decimal类型的。

现在把我的代码跟大家分享，如果有更好的idea，尤其是我想把其中的比较器写成泛型，但是没成功。还请不吝赐教。

 

1。Comparer

    //
    // Abstract:
    //    Comparer for Hash Table (by Value)
    public class HashComparerByValue : IComparer
    {
        private SortOrder sortDir = SortOrder.None;
        public HashComparerByValue(SortOrder sd)
        {
            sortDir = sd;
        }
        public int Compare(object x, object y)
        {
            DictionaryEntry de_x = (DictionaryEntry)x;
            DictionaryEntry de_y = (DictionaryEntry)y;
            Decimal diff = (Decimal)de_x.Value - (Decimal)de_y.Value;
            if (sortDir == SortOrder.Descending)
            {
                return (diff == 0) ? 0 : (diff > 0 ? -1 : 1);
            }
            else
            {
                return (diff == 0) ? 0 : (diff > 0 ? 1 : -1);
            }
        }
    }

 

 

2。Comparision Function

        private DictionaryEntry[] SortHashtable(Hashtable hasTbl, IComparer cmp)
        {
            DictionaryEntry[] dic = new DictionaryEntry[hasTbl.Count];
            hasTbl.CopyTo(dic, 0);
            Array.Sort(dic, cmp);
            return dic;
        }
3。Usage

     ......

                        DictionaryEntry[] dicEntry = new DictionaryEntry[scHash.Count];
                        HashComparerByValue hashCmp = new HashComparerByValue(SortOrder.Ascending);
                        dicEntry = SortHashtable(scHash, hashCmp);
                        foreach (DictionaryEntry scKey in dicEntry)
                        {
                            Console.WriteLine(scKey.Key.ToString());
                        }