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Kelas Kamus dalam C# diwakili sebagai Kamus
Sintaks kelas Kamus dalam C# adalah seperti berikut:
IDictionary<TKey, TValue> variable_name = new Dictionary<TKey, TValue>();
atau
Dictionary<TKey, TValue > variable_name = new Dictionary<TKey, TValue >();
Pertimbangkan contoh di bawah untuk menerangkan penggunaan kelas Kamus untuk mendapatkan kunci sahaja:
using System; using System.Collections.Generic; //a class called program is defined class program { // main method is called public static void Main() { // a new dictionary is created with key type string and value type string Dictionary<string, string> Dict = new Dictionary<string, string>(); // using add method in dictionary to add the objects to the dictionary Dict.Add("A", "Karnataka"); Dict.Add("B", "Maharashtra"); Dict.Add("C", "Andra"); Dict.Add("D", "TamilNadu"); Dict.Add("E", "Delhi"); Dict.Add("F", "Goa"); // Finding the number of key value pairs in the dictionary Console.WriteLine("The number of key value pairs in the dictionary are : " + Dict.Count); // using the property of keys to get the keys alone from the dictionary Dictionary<string, string>.KeyCollection key = Dict.Keys; // a foreach loop is used to loop around every key in the dictionary and to obtain each key value foreach(string sh in key) { Console.WriteLine("The key is referred as = {0}", sh); } } }
Output program di atas adalah seperti yang ditunjukkan dalam syot kilat di bawah:
Dalam atur cara di atas, atur cara ialah kelas yang ditakrifkan. Kemudian kaedah utama dipanggil. kamus baharu dicipta dengan rentetan jenis kunci dan rentetan jenis nilai. Kemudian gunakan kaedah tambah dalam kamus untuk menambah objek pada kamus. Kemudian bilangan pasangan nilai kunci dalam kamus ditemui menggunakan kiraan. Kemudian menggunakan sifat kunci, kunci sahaja daripada kamus diekstrak. Kemudian gelung foreach digunakan untuk mengelilingi setiap kunci dalam kamus dan untuk mendapatkan setiap nilai kunci. Output program adalah seperti yang ditunjukkan dalam syot kilat di atas.
Terdapat beberapa kaedah dalam kelas Kamus dalam C#. Mereka ialah:
using System; using System.Collections.Generic; //a class called check is defined public class Check { //main method is called public static void Main() { //a new dictionary is created with key type int and value type string IDictionary<int, string> str = new Dictionary<int, string>(); //Add method is used to add objects to the dictionary str.Add(3,"Green"); str.Add(1,"Saffron"); str.Add(2,"White"); str.Add(new KeyValuePair<int, string>(4, "Blue")); //The number of objects in the dictionary is displayed using count Console.WriteLine("The number of objects in the given dictionary is: {0} ", str.Count); } }
Output program di atas adalah seperti yang ditunjukkan dalam syot kilat di bawah:
Kaedah Remove() digunakan untuk mengalih keluar kejadian pertama item yang ditentukan daripada kamus.
Kaedah remove() digunakan untuk mengalih keluar elemen yang ditentukan bersama-sama dengan kunci daripada objek kamus.
Pertimbangkan contoh di bawah untuk menunjukkan penggunaan kaedah Remove() dalam kelas Kamus:
using System; using System.Collections.Generic; //a class called check1 is defined public class Check1 { //main method is called public static void Main() { //a new dictionary is created with key type int and value type string IDictionary<int, string> str1 = new Dictionary<int, string>(); //Add method is used to add objects to the dictionary str1.Add(3,"Green"); str1.Add(1,"Saffron"); str1.Add(2,"White"); str1.Add(new KeyValuePair<int, string>(4, "Blue")); str1.Remove(1); str1.Remove(new KeyValuePair<int, string>(2, "White")); //The number of objects in the dictionary is displayed using count Console.WriteLine("The number of objects in the given dictionary is: {0} ", str1.Count); } }
Output program di atas adalah seperti yang ditunjukkan dalam syot kilat di bawah:
Kaedah ContainsKey() digunakan untuk menyemak sama ada kunci yang diberikan terdapat dalam Kamus
Pertimbangkan program di bawah untuk menunjukkan penggunaan kaedah ContainsKey() dalam kelas Kamus:
using System; using System.Collections.Generic; //a class called2 check is defined public class Check2 { //main method is called public static void Main() { //a new dictionary is created with key type int and value type string IDictionary<int, string> str2 = new Dictionary<int, string>(); //Add method is used to add objects to the dictionary str2.Add(3,"Green"); str2.Add(1,"Saffron"); str2.Add(2,"White"); str2.Add(new KeyValuePair<int, string>(4, "Blue")); str2.Remove(1); str2.Remove(new KeyValuePair<int, string>(2, "White")); Console.WriteLine("If the key 3 is present?{0}", str2.ContainsKey(3)); Console.WriteLine("If the key 2 is present? {0}", str2.Contains(new KeyValuePair<int, string>(2, "White"))); //The number of objects in the dictionary is displayed using count Console.WriteLine("The number of objects in the given dictionary is: {0} ", str2.Count); } }
Output program di atas adalah seperti yang ditunjukkan dalam syot kilat di bawah:
Kaedah ContainsValue() digunakan untuk menyemak sama ada nilai yang diberikan terdapat dalam Dictionary
Pertimbangkan program di bawah untuk menunjukkan penggunaan kaedah ContainsValue() dalam kelas Kamus:
using System; using System.Collections.Generic; //a class called check3 is defined public class Check3 { //main method is called public static void Main() { //a new dictionary is created with key type int and value type string IDictionary<int, string> str2 = new Dictionary<int, string>(); //Add method is used to add objects to the dictionary str2.Add(3,"Green"); str2.Add(1,"Saffron"); str2.Add(2,"White"); str2.Add(new KeyValuePair<int, string>(4, "Blue")); str2.Remove(1); str2.Remove(new KeyValuePair<int, string>(2, "White")); Console.WriteLine("If the key 3 is present?{0}", str2.ContainsKey(3)); Console.WriteLine("If the key 2 is present? {0}", str2.Contains(new KeyValuePair<int, string>(2, "White"))); //new dictionary of both string key and string value types is defined Dictionary<string, string> stri = new Dictionary<string, string>(); stri.Add("Flag","Green"); Console.WriteLine("If the value Green is present?{0}", stri.ContainsValue("Green")); //The number of objects in the dictionary is displayed using count Console.WriteLine("The number of objects in the given dictionary is: {0} ", str2.Count); } }
Output program di atas adalah seperti yang ditunjukkan dalam syot kilat di bawah:
Kaedah clear() digunakan untuk mengosongkan semua objek dalam kelas kamus.
Pertimbangkan program di bawah untuk menunjukkan penggunaan kaedah ContainsValue() dalam kelas Kamus:
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading; using System.Threading.Tasks; //a class called check4 is defined public class Check4 { //main method is called public static void Main() { //a new dictionary is created with key type int and value type string IDictionary<int, string> str3 = new Dictionary<int, string>(); //Add method is used to add objects to the dictionary str3.Add(3,"Green"); str3.Add(1,"Saffron"); str3.Add(2,"White"); str3.Add(new KeyValuePair<int, string>(4, "Blue")); str3.Remove(1); str3.Remove(new KeyValuePair<int, string>(2, "White")); Console.WriteLine("If the key 3 is present?{0}", str3.ContainsKey(3)); Console.WriteLine("If the key 2 is present? {0}", str3.Contains(new KeyValuePair<int, string>(2, "White"))); //new dictionary of both string key and string value types is defined Dictionary<string, string> stri1 = new Dictionary<string, string>(); stri1.Add("Flag","Green"); Console.WriteLine("If the value Green is present?{0}", stri1.ContainsValue("Green")); //The number of objects in the dictionary is displayed using count Console.WriteLine("The number of objects in the given dictionary is: {0} ", str3.Count); Console.Clear(); } }
Output program di atas kosong seperti yang ditunjukkan dalam syot kilat di bawah:
Kaedah TryGetValue() menyemak sama ada kunci yang diberikan wujud, jika ia tidak wujud ia mengembalikan palsu. Jika kunci yang diberikan wujud, ia mengembalikan benar dan memberikan nilai yang diberikan kepada kunci yang ditentukan.
Consider the below program to demonstrate the usage of TryGetValue() method of Dictionary class:
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading; using System.Threading.Tasks; //a class called check4 is defined public class Check4 { //main method is called public static void Main() { //a new dictionary is created with key type int and value type string IDictionary<int, string> str3 = new Dictionary<int, string>(); //Add method is used to add objects to the dictionary str3.Add(3,"Green"); str3.Add(1,"Saffron"); str3.Add(2,"White"); str3.Add(new KeyValuePair<int, string>(4, "Blue")); str3.Remove(1); str3.Remove(new KeyValuePair<int, string>(2, "White")); Console.WriteLine("If the key 3 is present?{0}", str3.ContainsKey(3)); Console.WriteLine("If the key 2 is present? {0}", str3.Contains(new KeyValuePair<int, string>(2, "White"))); //new dictionary of both string key and string value types is defined Dictionary<string, string> stri1 = new Dictionary<string, string>(); stri1.Add("Flag","Green"); Console.WriteLine("If the value Green is present?{0}", stri1.ContainsValue("Green")); string res; if(str3.TryGetValue(4, out res)) { Console.WriteLine("The value of the specified key is {0}", res); } else { Console.WriteLine("The specified key is not present."); } //The number of objects in the dictionary is displayed using count Console.WriteLine("The number of objects in the given dictionary is: {0} ", str3.Count); } }
The output of the above program is as shown in the snapshot below:
In this tutorial, we understand the concept of Dictionary class in C# through definition, the syntax of Dictionary class in C#, working of Dictionary class, and their methods through programming examples and their outputs.
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