Sao chép ListDictionary sang Array instance tại index chỉ định trong C#

Để sao chép ListDictionary sang instance Array tại index chỉ định, ta dùng phương thức CopyTo. Dưới đây là các ví dụ.

Ví dụ 1

using System;
using System.Collections;
using System.Collections.Specialized;

public class Demo {
    public static void Main(){
        ListDictionary dict = new ListDictionary();
        dict.Add(1, "Harry");
        dict.Add(2, "Mark");
        dict.Add(3, "John");
        dict.Add(4, "Jacob");
        dict.Add(5, "Tim");
        dict.Add(6, "Sam");
        dict.Add(7, "Tom");
        dict.Add(8, "Kevin");
        
        Console.WriteLine("ListDictionary elements...");
        foreach(DictionaryEntry d in dict){
            Console.WriteLine(d.Key + " " + d.Value);
        }
        
        DictionaryEntry[] dictArr = new DictionaryEntry[dict.Count];
        Console.WriteLine("\nCopying to Array instance...");
        dict.CopyTo(dictArr, 0);
        
        for (int i = 0; i < dictArr.Length; i++) {
            Console.WriteLine("Key = " + dictArr[i].Key + ", Value = " + dictArr[i].Value);
        }
    }
}

Kết quả

ListDictionary elements...
1 Harry
2 Mark
3 John
4 Jacob
5 Tim
6 Sam
7 Tom
8 Kevin
Copying to Array instance...
Key = 1, Value = Harry
Key = 2, Value = Mark
Key = 3, Value = John
Key = 4, Value = Jacob
Key = 5, Value = Tim
Key = 6, Value = Sam
Key = 7, Value = Tom
Key = 8, Value = Kevin

Ví dụ 2

using System;
using System.Collections;
using System.Collections.Specialized;

public class Demo {
    public static void Main() {
        ListDictionary dict = new ListDictionary();
        dict.Add(1, "Harry");
        dict.Add(2, "Mark");
        dict.Add(3, "John");
        dict.Add(4, "Jacob");
        dict.Add(5, "Tim");
        
        Console.WriteLine("ListDictionary elements...");
        foreach(DictionaryEntry d in dict) {
            Console.WriteLine(d.Key + " " + d.Value);
        }
        
        DictionaryEntry[] dictArr = new DictionaryEntry[10];
        Console.WriteLine("\nCopying to Array instance...");
        dict.CopyTo(dictArr, 5);
        
        for (int i = 0; i < dictArr.Length; i++) {
            Console.WriteLine("Key = " + dictArr[i].Key + ", Value = " + dictArr[i].Value);
        }
    }
}

Kết quả

ListDictionary elements...
1 Harry
2 Mark
3 John
4 Jacob
5 Tim
Copying to Array instance...
Key = , Value = 
Key = , Value = 
Key = , Value = 
Key = , Value = 
Key = , Value = 
Key = 1, Value = Harry
Key = 2, Value = Mark
Key = 3, Value = John
Key = 4, Value = Jacob
Key = 5, Value = Tim