Getting the list of keys of a SortedList object in C#

To get the list of keys of a SortedList object, the code is as follows −

Example

 Live Demo

using System;
using System.Collections;
public class Demo {
   public static void Main(String[] args) {
      SortedList list1 = new SortedList();
      list1.Add("One", 1);
      list1.Add("Two ", 2);
      list1.Add("Three ", 3);
      list1.Add("Four", 4);
      list1.Add("Five", 5);
      list1.Add("Six", 6);
      list1.Add("Seven ", 7);
      list1.Add("Eight ", 8);
      list1.Add("Nine", 9);
      list1.Add("Ten", 10);
      Console.WriteLine("SortedList1 elements...");
      foreach(DictionaryEntry d in list1) {
         Console.WriteLine(d.Key + " " + d.Value);
      }
      Console.WriteLine("
List of keys...SortedList1");
      IList list = list1.GetKeyList();
      foreach(string res in list)
      Console.WriteLine(res);
      SortedList list2 = new SortedList();
      list2.Add("A", "Accessories");
      list2.Add("B", "Books");
      list2.Add("C", "Smart Wearable Tech");
      list2.Add("D", "Home Appliances");
      Console.WriteLine("
SortedList2 elements...");
      foreach(DictionaryEntry d in list2) {
         Console.WriteLine(d.Key + " " + d.Value);
      }
      Console.WriteLine("
List of keys...SortedList2");
      list = list2.GetKeyList();
      foreach(string res in list)
         Console.WriteLine(res);
   }
}

Output

This will produce the following output −

SortedList1 elements...
Eight  8
Five 5
Four 4
Nine 9
One 1
Seven  7
Six 6
Ten 10
Three  3
Two  2
List of keys...SortedList1
Eight
Five
Four
Nine
One
Seven
Six
Ten
Three
Two
SortedList2 elements...
A Accessories
B Books
C Smart Wearable Tech
D Home Appliances
List of keys...SortedList2
A
B
C
D

Example

Let us see another example −

 Live Demo

using System;
using System.Collections;
public class Demo {
   public static void Main(String[] args) {
      SortedList list = new SortedList();  
      list.Add("One", 1);
      list.Add("Two ", 2);
      list.Add("Three ", 3);
      list.Add("Four", 4);
      list.Add("Five", 5);
      Console.WriteLine("SortedList elements...");
      foreach(DictionaryEntry d in list) {
         Console.WriteLine(d.Key + " " + d.Value);
      }
      Console.WriteLine("
List of keys...SortedList");
      IList col = list.GetKeyList();
      foreach(string res in col)
         Console.WriteLine(res);
   }
}

Output

This will produce the following output −

SortedList elements...
Five 5
Four 4
One 1
Three  3
Two  2
List of keys...SortedList
Five
Four
One
Three
Two