C # key-value pairs

1. Initialize a key-value pair

1  // initialize to define a key-value pair, note the last parenthesis 2  dictionary<intstringnew dictionary<intstring> ();

2. Adding elements to key-value pairs

1 //the Add function of a key-value pair2Dic.ADD(2,"Zhao");3Dic.ADD(4,"Qian");4Dic.ADD(6,"Sun");5Dic.ADD(8,"Li");

3. ContainsKey and Containsvalue functions for key-value pairs

1 //ContainsKey and Containsvalue functions for key-value pairs2Console.WriteLine (dic[4]);3Console.WriteLine ("whether key-value pairs contain key 2:"+ DIC.ContainsKey(2));4Console.WriteLine ("whether key-value pairs contain key 5:"+ DIC.ContainsKey(5));5Console.WriteLine ("whether a key-value pair contains a value Zhao:"+ DIC.Containsvalue("Zhao"));6Console.WriteLine ("whether a key-value pair contains a value Zhao:"+ DIC.Containsvalue("Zhao"));

4. Number of key-value pairs

1 // number of key-value pairs 2 Console.WriteLine (" key-value pairs contain the number of key values:" + dic. ) Count);

5. Keys property for key-value pairs

1 // Keys property for key-value pairs 2 foreach (intitem in  dic.) Keys)3{4     Console.WriteLine (" key: {0}, Value: {1}  "Item, Dic[item]); 5 }

6. Traversing a key-value pair

1 // To traverse a key-value pair 2 foreach (keyvaluepair<int,string in   dic) 3 {4     Console.WriteLine (The key is: {0}, the value is: {1}"kv. Key, KV. Value); 5 }

C # key-value pairs