C# Dictionary使用

  Dictionary<string, int> illegParking = new Dictionary<string, int>();ide

鍵:inData.LOTIDspa

值:inData.ISILLEGPARKINGcode

1、判斷鍵存不存在。blog

dictionary中是不容許有重複項的,這樣才能按key索引到惟一一個value索引

if (illegParking.ContainsKey(inData.LOTID))
                {
                    illegParking[inData.LOTID] = inData.ISILLEGPARKING;
                }
                else
                {
                    illegParking.Add(inData.LOTID, inData.ISILLEGPARKING);
                }

 
View Code

2、幾種遍歷方式:string

Dictionary<string, int> list = new Dictionary<string, int>();

   foreach (var item in list)

            {

                Console.WriteLine(item.Key + item.Value);

            }

 //經過鍵的集合取

            foreach (string key in list.Keys)

            {

                Console.WriteLine(key + list[key]);

            }

   //直接取值

            foreach (int val in list.Values)

            {

                Console.WriteLine(val);

            } 

 //非要採用for的方法也可

 Dictionary<string, int> list = new Dictionary<string, int>();         

   List<string> test = new List<string>(list.Keys);

            for (int i = 0; i < list.Count; i++)

            {

                Console.WriteLine(test[i] + list[test[i]]);

            }
View Code

3、涉及到移除某個鍵值的時候it

  不能在foreach循環裏面移除,由於會致使錯誤:集合已修改;可能沒法執行枚舉操做。能夠改用for循環io

//dicmodels是個dictionaryfor循環

List<string> keys = new List<string>(dicModels.Keys);
for (int i = keys.Count - 1; i >= 0; i--)
     {
      }
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