Thêm phần tử vào Hashtable trong C#

Để thêm phần tử vào Hashtable, ta dùng phương thức Add. Dưới đây là các ví dụ.

Ví dụ 1

using System;
using System.Collections;

public class Demo {
    public static void Main(){
        Hashtable hash = new Hashtable(10);
        hash.Add("1", "A");
        hash.Add("2", "B");
        hash.Add("3", "C");
        hash.Add("4", "D");
        hash.Add("5", "E");
        hash.Add("6", "F");
        hash.Add("7", "G");
        hash.Add("8", "H");
        hash.Add("9", "I");
        hash.Add("10", "J");
        
        Console.WriteLine("Hashtable Key and Value pairs...");
        foreach(DictionaryEntry entry in hash){
            Console.WriteLine("{0} and {1} ", entry.Key, entry.Value);
        }
        
        Console.WriteLine("Số entry trong Hashtable = " + hash.Count);
        
        hash.Add("11", "K");
        
        Console.WriteLine("Hashtable Key and Value pairs...UPDATED");
        foreach(DictionaryEntry entry in hash){
            Console.WriteLine("{0} and {1} ", entry.Key, entry.Value);
        }
        
        Console.WriteLine("Số entry trong Hashtable (updated) = " + hash.Count);
    }
}

Kết quả

Hashtable Key and Value pairs...
10 and J
1 and A
2 and B
3 and C
4 and D
5 and E
6 and F
7 and G
8 and H
9 and I
Số entry trong Hashtable = 10
Hashtable Key and Value pairs...UPDATED
10 and J
1 and A
2 and B
3 and C
4 and D
5 and E
6 and F
7 and G
8 and H
9 and I
11 and K
Số entry trong Hashtable (updated) = 11

Ví dụ 2

using System;
using System.Collections;

public class Demo {
    public static void Main(){
        Hashtable hash = new Hashtable(10);
        hash.Add("1", "SUV");
        hash.Add("2", "Electric Cars");
        hash.Add("3", "AUV");
        hash.Add("4", "Utility Vehicle");
        hash.Add("5", "Compact Car");
        hash.Add("6", "Sedan");
        hash.Add("7", "Crossover");
        
        Console.WriteLine("Enumerator to iterate through the Hashtable...");
        IDictionaryEnumerator demoEnum = hash.GetEnumerator();
        while (demoEnum.MoveNext())
            Console.WriteLine("Key = " + demoEnum.Key + ", Value = " + demoEnum.Value);
    }
}

Kết quả

Enumerator to iterate through the Hashtable...
Key = 1, Value = SUV
Key = 2, Value = Electric Cars
Key = 3, Value = AUV
Key = 4, Value = Utility Vehicle
Key = 5, Value = Compact Car
Key = 6, Value = Sedan
Key = 7, Value = Crossover