Dictionary（数据字典）

数据字典：Dictionary对象用于在结对的名称/值中存储信息（等同于键和项目），其可作为传参使用。

C# Dictionary字典类的使用方法

//定义字典
            Dictionary<string, string> d = new Dictionary<string, string>();
            //添加字典的元素
            for (int i = 0; i < 5; i++)
            {
                d.Add("key" + i, "value" + i);
            }
            //取值/赋值
            string val = d["key1"];
            d["key1"] = "new value";
            //遍历key
            foreach (string key in d.Keys)
            {
                Console.WriteLine("Key = {0}", key);
            }
            //遍历value
            foreach (string v in d.Values)
            {
                Console.WriteLine("value = {0}", v);
            }
            //遍历value, Second Method
            Dictionary<string, string>.ValueCollection valueColl = d.Values;
            foreach (string s in valueColl)
            {
                Console.WriteLine("Second Method, Value = {0}", s);
            }
            //遍历字典
            foreach (KeyValuePair<string, string> kvp in d)
            {
                Console.WriteLine("Key = {0}, Value = {1}", kvp.Key, kvp.Value);
            }
            //删除元素
            d.Remove("key1");
            if (!d.ContainsKey("key1"))
            {
                Console.WriteLine("Key \"key1\" is not found.");
            }
            //判断键存在
            if (d.ContainsKey("key1")) // True
            {
                Console.WriteLine("An element with Key = \"key1\" exists.");
            }