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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
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 −
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
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