Check whether the Dictionary contains a specific value or not in C#


To check whether the Dictionary<TKey,TValue> contains a specific value or not, the code is as follows −

Example

 Live Demo

using System;
using System.Collections.Generic;
public class Demo {
   public static void Main() {
      Dictionary<string, string> dict =
      new Dictionary<string, string>();
      dict.Add("One", "John");
      dict.Add("Two", "Tom");
      dict.Add("Three", "Jacob");
      dict.Add("Four", "Kevin");
      dict.Add("Five", "Nathan");
      Console.WriteLine("Count of elements = "+dict.Count);
      Console.WriteLine("
Key/value pairs...");       foreach(KeyValuePair<string, string> res in dict) {          Console.WriteLine("Key = {0}, Value = {1}", res.Key, res.Value);       }       if (dict.ContainsValue("Kevin"))          Console.WriteLine("Value found!");       else          Console.WriteLine("Value isn't in the dictionary!");          dict.Clear();          Console.WriteLine("Cleared Key/value pairs...");       foreach(KeyValuePair<string, string> res in dict) {          Console.WriteLine("Key = {0}, Value = {1}", res.Key, res.Value);       }       Console.WriteLine("Count of elements now = "+dict.Count);    } }

Output

This will produce the following output −

Count of elements = 5
Key/value pairs...
Key = One, Value = John
Key = Two, Value = Tom
Key = Three, Value = Jacob
Key = Four, Value = Kevin
Key = Five, Value = Nathan
Value found!
Cleared Key/value pairs...
Count of elements now = 0

Example

Let us now see another example −

 Live Demo

using System;
using System.Collections.Generic;
public class Demo {
   public static void Main() {
      Dictionary<string, string> dict = new Dictionary<string, string>();
      dict.Add("One", "Chris");
      dict.Add("Two", "Steve");
      dict.Add("Three", "Messi");
      dict.Add("Four", "Ryan");
      dict.Add("Five", "Nathan");
      Console.WriteLine("Count of elements = "+dict.Count);
      Console.WriteLine("
Key/value pairs...");       foreach(KeyValuePair<string, string> res in dict) {          Console.WriteLine("Key = {0}, Value = {1}", res.Key, res.Value);       }       if (dict.ContainsValue("Angelina"))          Console.WriteLine("Value found!");       else          Console.WriteLine("Value isn't in the dictionary!");          dict.Clear();          Console.WriteLine("Cleared Key/value pairs...");       foreach(KeyValuePair<string, string> res in dict) {          Console.WriteLine("Key = {0}, Value = {1}", res.Key, res.Value);       }       Console.WriteLine("Count of elements now = "+dict.Count);    } }

Output

This will produce the following output −

Count of elements = 5
Key/value pairs...
Key = One, Value = Chris
Key = Two, Value = Steve
Key = Three, Value = Messi
Key = Four, Value = Ryan
Key = Five, Value = Nathan
Value isn't in the dictionary!
Cleared Key/value pairs...
Count of elements now = 0

Updated on: 11-Dec-2019

327 Views

Kickstart Your Career

Get certified by completing the course

Get Started
Advertisements