C# | Getting the keys in a SortedList object

SortedList.Keys Property is used to get the keys in a SortedList object.

Syntax:

public virtual System.Collections.ICollection Keys { get; }

Property Value: An ICollection object containing the keys in the SortedList object.



Below programs illustrate the use of above-discussed property:

Example 1:

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// C# code to get an ICollection containing
// the keys in the SortedList
using System;
using System.Collections;
  
class GFG {
  
    // Driver code
    public static void Main()
    {
  
        // Creating a SortedList
        SortedList mylist = new SortedList();
  
        // Adding elements in SortedList
        mylist.Add("4", "Even");
        mylist.Add("9", "Odd");
        mylist.Add("5", "Odd and Prime");
        mylist.Add("2", "Even and Prime");
  
        // Get a collection of the keys.
        ICollection c = mylist.Keys;
  
        // Displaying the contents
        foreach(string str in c)
            Console.WriteLine(str + ": " + mylist[str]);
    }
}

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Output:

2: Even and Prime
4: Even
5: Odd and Prime
9: Odd

Example 2:

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// C# code to get an ICollection containing
// the keys in the SortedList.
using System;
using System.Collections;
  
class GFG {
  
    // Driver code
    public static void Main()
    {
  
        // Creating a SortedList
        SortedList mylist = new SortedList();
  
        // Adding elements in SortedList
        mylist.Add("India", "Country");
        mylist.Add("Chandigarh", "City");
        mylist.Add("Mars", "Planet");
        mylist.Add("China", "Country");
  
        // Get a collection of the keys.
        ICollection c = mylist.Keys;
  
        // Displaying the contents
        foreach(string str in c)
            Console.WriteLine(str + ": " + mylist[str]);
    }
}

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Output:

Chandigarh: City
China: Country
India: Country
Mars: Planet

Note:

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

Reference:



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