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ContainsKey in C#
ContainsKey is a Dictionary method in C# and check whether a key exists in the Dictionary or not.
Declare a Dictionary and add elements −
var dict = new Dictionary<string, int>() { {"TV", 1}, {"Home Theatre", 2}, {"Amazon Alexa", 3}, {"Google Home", 5}, {"Laptop", 5}, {"Bluetooth Speaker", 6} };
Now, let’s say you need to check for the existence of a particular element in the Dictionary. For that, use the ContainsKey() method −
if (dict.ContainsKey("Laptop") == true) { Console.WriteLine(dict["Laptop"]); }
The following is the code −
Example
using System; using System.Collections.Generic; public class Demo { public static void Main() { var dict = new Dictionary<string, int>() { {"TV", 1}, {"Home Theatre", 2}, {"Amazon Alexa", 3}, {"Google Home", 5}, {"Laptop", 5}, {"Bluetooth Speaker", 6} }; if (dict.ContainsKey("Laptop") == true) { Console.WriteLine(dict["Laptop"]); } if (dict.ContainsKey("Amazon Alexa") == true) { Console.WriteLine(dict["Amazon Alexa"]); } } }
Output
5 3
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