SortedList ContainsKey() Method in C# With Examples (original) (raw)

Last Updated : 16 Nov, 2021

Given a SortedList object, now our task is to check whether the given SortedList object contains the specific key or not. So to do this task we use ContainsKey() method. This method is used to determine whether a SortedList object contains a specific key or not. It will return true if the key is found, otherwise, it will return false.

Syntax:

bool SortedList.ContainsKey(object key);

Where key is located in the SortedList object.

Example:

Input : [(1, "Python"), (2, "c")] Key : 1 Output : Found Input : [(1, "Python"), (2, "c")] Key : 4 Output : Not Found

Approach:

1. Create a sorted list.
2. Add key and values to the sorted list.
3. Check whether the particular key exists in the list using ContainsKey() method.
4. Display the output.

C# `

// C# program to check whether a SortedList // object contains a specific key or not using System; using System.Collections;

class GFG{

static public void Main() {

// Create sorted list
SortedList data = new SortedList();

// Add elements to data sorted list 
data.Add(1, "Python");
data.Add(2, "c");
data.Add(3, "java");
data.Add(4, "php");
data.Add(5, "html");
data.Add(6, "bigdata");
data.Add(7, "java script");

// Check whether the key - 1 is present
// in the list or not
if (data.ContainsKey(1))
    Console.WriteLine("Present in the List");
else
    Console.WriteLine("Not in the List");
    
// Check whether the key - 4 is present
// in the list or not
if (data.ContainsKey(4))
    Console.WriteLine("Present in the List");
else
    Console.WriteLine("Not in the List");

// Check whether the key - 8 is present
// in the list or not
if (data.ContainsKey(8))
    Console.WriteLine("Present in the List");
else
    Console.WriteLine("Not in the List");

} }

`

Output:

Present in the List Present in the List Not in the List