C# hashTable的遍历【2种方法】与排序【3种方法】

private void Form1_Load(object sender, EventArgs e)
{
    Hashtable ht = new Hashtable();

    ht.Add("job", "a");
    ht.Add("jobmon", "20");

    //单个取值，方法比较特别
    string a = ht["jobmon"].ToString();
    //Console.WriteLine(a);

    //第一种方法遍历
    foreach(DictionaryEntry de in ht)
    {
        Console.WriteLine(de.Key);
        Console.WriteLine(de.Value);
    }

    Console.WriteLine("-------------------------");

    //第二种方法遍历
    IDictionaryEnumerator enumerator = ht.GetEnumerator();
    while (enumerator.MoveNext())
    {
        Console.WriteLine(enumerator.Key);
        Console.WriteLine(enumerator.Value);
    }

    Console.WriteLine("++++++++++++++++++++++++++");
    //hashtable的排序第一种方法，按照键的大小排序

    ArrayList al = new ArrayList(ht.Keys);

    al.Sort();
    al.Reverse(); //反向排序

    foreach (string str in al)
    {
        Console.WriteLine(str + "  " + ht[str]);
    }

    Console.WriteLine("++++++++++++++++++++++++++");
    //hashtable的排序第二种方法，按照值的大小排序

    ArrayList alv = new ArrayList(ht.Values);
    alv.Sort();

    foreach (string str in alv)
    {
        IDictionaryEnumerator enumerator2 = sl.GetEnumerator();

        while (enumerator2.MoveNext())
        {
            if (str.Equals(enumerator2.Value.ToString()))
            {

                Console.WriteLine(enumerator2.Key + ":" + enumerator2.Value);
            }

        }


    }

    Console.WriteLine("++++++++++++++++++++++++++");
    //hashtable的排序第三种方法，用SortedList代替hashtable

    SortedList sl = new SortedList();

    sl.Add("a", "a1");
    sl.Add("c", "c1");
    sl.Add("b", "b1");

    IDictionaryEnumerator enumerator1 = sl.GetEnumerator();
    while (enumerator1.MoveNext())
    {
        Console.WriteLine(enumerator1.Key);
        Console.WriteLine(enumerator1.Value);
    }

}