C# | Getting the list of keys of a SortedList object
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 Beginner { // 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 Beginner { // 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