Question

C#Dictionary的使用问题

string sDictionaryKey = "001";
//string[] sDictionaryValue = { "张三", "32", "经理", "8000" };
string[] sDictionaryValue = new string[4];
sDictionaryValue[0] = "张三";
sDictionaryValue[1] = "32";
sDictionaryValue[2] = "经理";
sDictionaryValue[3] = "8000";
myDictionary.Clear();
myDictionary.Add(sDictionaryKey, sDictionaryValue);

sDictionaryKey = "002";
sDictionaryValue[0] = "李四";
sDictionaryValue[1] = "23";
sDictionaryValue[2] = "主管";
sDictionaryValue[3] = "6000";
myDictionary.Add(sDictionaryKey, sDictionaryValue);

以上代码执行后会出现001和002的value一样???为什么呢?

Answer 1

估计myDictionary 是这样定义的：
Dictionary<string, string[]> myDictionary = new Dictionary<string, string[]>();

当你第一次对 string[]赋值（张三，32……）后并存放到myDictionary中键为"001"，存入myDictionary的“键——值”对为： "001" ——sDictionaryValue
接着你有将sDictionaryValue重新赋值，添加到集合后“键——值”对为： "002" ——sDictionaryValue
这里要注意：sDictionaryValue此时已经是（李四，23……）了

追问

难度真是引用参数的问题??我想你因该知道我想要的效果吧?求求你帮帮我吧....

追答

string sDictionaryKey = "001";
//string[] sDictionaryValue = { "张三", "32", "经理", "8000" };
string[] sDictionaryValue = new string[4];
sDictionaryValue[0] = "张三";
sDictionaryValue[1] = "32";
sDictionaryValue[2] = "经理";
sDictionaryValue[3] = "8000";
myDictionary.Clear();
myDictionary.Add(sDictionaryKey, sDictionaryValue);

string[] sDictionaryValue2 = new string[4];
sDictionaryKey = "002";
sDictionaryValue2[0] = "李四";
sDictionaryValue2[1] = "23";
sDictionaryValue2[2] = "主管";
sDictionaryValue2[3] = "6000";
myDictionary.Add(sDictionaryKey, sDictionaryValue2);

Answer 2

数组是引用类型

追问

不是吧?那局部变量释放后它不就没值了? 我要怎么才能到达我要的效果呢?

追答

            string sDictionaryKey = "001";
            string[] sDictionaryValue = new string[4];
            sDictionaryValue[0] = "张三";
            sDictionaryValue[1] = "32";
            sDictionaryValue[2] = "经理";
            sDictionaryValue[3] = "8000";
            myDictionary.Add(sDictionaryKey, sDictionaryValue);

            //重新new一个数组
            sDictionaryValue = new string[4];
            sDictionaryKey = "002";
            sDictionaryValue[0] = "李四";
            sDictionaryValue[1] = "23";
            sDictionaryValue[2] = "主管";
            sDictionaryValue[3] = "6000";
            myDictionary.Add(sDictionaryKey, sDictionaryValue);

追问

谢谢...原来要在循环里面定义数组才行...唉~~C#跟VB好多不一样啊