C# | Getting the keys in a SortedList object

Last Updated : 01 Feb, 2019

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:

CSharp

// 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]);
    }
}

Output:

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

Example 2:

CSharp

// 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]);
    }
}

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:

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

C# | Getting the Values in a SortedList object

Kirti_Mangal

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C# | Getting the keys in a SortedList object

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