hashtable 嵌套hashtable 赋值

[xyl2960]

static void Main(string[] args)
        {
            Hashtable htname = new Hashtable();
            Hashtable _date = new Hashtable();
            for (int i = 0; i < 5; i++)
            {
                _date.Add(i.ToString(),"0");
            }
            htname.Add("一号锅炉",_date);
            htname.Add("二号锅炉",_date);

            for (int i = 0; i < 5; i++)
            {
                string name = "一号锅炉";
                string ele = (2 + 2).ToString();
                Hashtable date = new Hashtable();
                date = htname[name] as Hashtable;
                date[2.ToString()] = ele;
                htname[name] = date;

            }
            foreach (DictionaryEntry item in htname["一号锅炉"] as Hashtable)
            {
                Console.WriteLine(item.Key.ToString() + "," + item.Value.ToString());
            }
            foreach (DictionaryEntry item in htname["二号锅炉"] as Hashtable)
            {
                Console.WriteLine(item.Key.ToString() + "," + item.Value.ToString());
            }
            Console.Read();
        }

说明，我问htname["一号锅炉"]的value 赋值，但程序全部都赋值了， 但当htname 的value为string类型时没问题

[掌握永恒需控制现在]

因为你的_date是个类 ,应该说是引用类型的,实质上你改变"一号锅炉"里面的hashtable(_date)实质上只要用到这个hashtable(_date)的地方都会改变

[掌握永恒需控制现在]

引用 楼主 xyl2960 的回复:

static void Main(string[] args)
        {
            Hashtable htname = new Hashtable();
            Hashtable _date = new Hashtable();
            for (int i = 0; i < 5; i++)
            {
                _date.Add(i.ToString(),"0");
            }
            htname.Add("一号锅炉",_date);
            htname.Add("二号锅炉",_date);

            for (int i = 0; i < 5; i++)
            {
                string name = "一号锅炉";
                string ele = (2 + 2).ToString();
                Hashtable date = new Hashtable();
                date = htname[name] as Hashtable;
                date[2.ToString()] = ele;
                htname[name] = date;

            }
            foreach (DictionaryEntry item in htname["一号锅炉"] as Hashtable)
            {
                Console.WriteLine(item.Key.ToString() + "," + item.Value.ToString());
            }
            foreach (DictionaryEntry item in htname["二号锅炉"] as Hashtable)
            {
                Console.WriteLine(item.Key.ToString() + "," + item.Value.ToString());
            }
            Console.Read();
        }

说明，我问htname["一号锅炉"]的value 赋值，但程序全部都赋值了， 但当htname 的value为string类型时没问题

解决办法就是 每次 htname.Add()的时候都要初始化一个hashtable

[xyl2960]

谢谢，高手，问题解决了，又学到了新东西