Get an ICollection containing keys in OrderedDictionary in C#

To get an ICollection containing keys in OrderedDictionary, the code is as follows −

Example

 Live Demo

using System;
using System.Collections;
using System.Collections.Specialized;
public class Demo {
   public static void Main() {
      OrderedDictionary dict = new OrderedDictionary();
      dict.Add("1", "One");
      dict.Add("2", "Two");
      dict.Add("3", "Three");
      dict.Add("4", "Four");
      dict.Add("5", "Five");
      dict.Add("6", "Six");
      dict.Add("7", "Seven");
      dict.Add("8", "Eight");
      ICollection col = dict.Keys;
      String[] strKeys = new String[dict.Count];
      col.CopyTo(strKeys, 0);
      Console.WriteLine("Displaying the keys...");
      for (int i = 0; i < dict.Count; i++) {
         Console.WriteLine(strKeys[i]);
      }
   }
}

Output

This will produce the following output −

Displaying the keys...
1
2
3
4
5
6
7
8

Example

Let us see another example −

 Live Demo

using System;
using System.Collections;
using System.Collections.Specialized;
public class Demo {
   public static void Main() {
      OrderedDictionary dict = new OrderedDictionary();
      dict.Add("One", "John");
      dict.Add("Two", "Tim");
      dict.Add("Three", "Katie");
      dict.Add("Four", "Andy");
      dict.Add("Five", "Gary");
      dict.Add("Six", "Amy");
      ICollection col = dict.Keys;
      String[] strKeys = new String[dict.Count];
      col.CopyTo(strKeys, 0);
      Console.WriteLine("Displaying the keys...");
      for (int i = 0; i < dict.Count; i++) {
         Console.WriteLine(strKeys[i]);
      }
   }
}

Output

This will produce the following output −

Displaying the keys...
One
Two
Three
Four
Five
Six