C # Dictionary use

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

- key: inData.LOTID

值: inData.ISILLEGPARKING

1 , it is determined key exists or not.

dictionary is not allowed to have duplicates, so as to press the key index to a unique value .

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

 

View Code

2 , traversing several ways:

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

   foreach (var item in list)

            {

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

            }

 //通过键的集合取

            foreach (string key in list.Keys)

            {

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

            }

   //直接取值

            foreach (int val in list.Values)

            {

                Console.WriteLine(val);

            } 

 //非要采用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 , it comes to the removal of a key

　　Foreach loop which can not be removed, as it will lead to error: the collection has been modified; enumeration operation may not execute . You can use a for loop

// dicmodels a dictionary

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