C#学习笔记——字典

C# Dictionary字典类的使用方法

代码语言：javascript复制

　　　　　　　　   //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.");
                }

c# dictionary

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