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

Last Updated : 01 Feb, 2019

SortedList.GetKeyList Method is used to get the list of keys in a SortedList object.

Syntax:

public virtual System.Collections.IList GetKeyList ();

Return Value: It returns an IList object containing the keys in the SortedList object.

Below programs illustrate the use of above-discussed method:

Example 1:

// C# code for getting the keys 
// in a SortedList object 
using System; 
using System.Collections; 
  
class Geeks { 
  
    // Main Method 
    public static void Main(String[] args) 
    { 
  
        // Creating a SortedList of integers 
        SortedList mylist = new SortedList(); 
  
        // Adding elements to SortedList 
        mylist.Add("1", "C++"); 
        mylist.Add("2", "Java"); 
        mylist.Add("3", "DSA"); 
        mylist.Add("4", "Python"); 
        mylist.Add("5", "C#"); 
  
        // taking an IList and 
        // using GetKeyList method 
        IList klist = mylist.GetKeyList(); 
  
        // Prints the list of keys 
        Console.WriteLine("Key List"); 
  
        for (int i = 0; i < mylist.Count; i++) 
            Console.WriteLine(klist[i]); 
    } 
} 

Output:

Key List
1
2
3
4
5

Example 2:

// C# code for getting the keys 
// in a SortedList object 
using System; 
using System.Collections; 
  
class Geeks { 
  
    // Main Method 
    public static void Main(String[] args) 
    { 
  
        // Creating a SortedList of integers 
        SortedList mylist = new SortedList(); 
  
        // Adding elements to SortedList 
        mylist.Add("First", "Ram"); 
        mylist.Add("Second", "Shyam"); 
        mylist.Add("Third", "Mohit"); 
        mylist.Add("Fourth", "Rohit"); 
        mylist.Add("Fifth", "Manish"); 
  
        // taking an IList and 
        // using GetKeyList method 
        IList klist = mylist.GetKeyList(); 
  
        // Prints the list of keys 
        Console.WriteLine("Key List"); 
  
        // will print the keys in sorted order 
        for (int i = 0; i < mylist.Count; i++) 
            Console.WriteLine(klist[i]); 
    } 
} 

Output:

Key List
Fifth
First
Fourth
Second
Third

Note:

The returned IList object is a read-only view of the keys of the SortedList object. Modifications made to the underlying SortedList are immediately reflected in the IList.
The elements of the returned IList are sorted in the same order as the keys of the SortedList.
This method is similar to the Keys property but returns an IList object instead of an ICollection object.
This method is an O(1) operation.

Reference:

https://docs.microsoft.com/en-us/dotnet/api/system.collections.sortedlist.getkeylist?view=netframework-4.7.2

C# | Getting the keys in a SortedList object

Kirti_Mangal

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