C# Array - Exists() Method

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The C# Array Exists() method is used to determine whether the array contains elements that match the conditions defined by the specified predicate.

Syntax

Following is the syntax of the C# Array Exists() method −

public static bool Exists<T> (T[] array, Predicate<T> match);

Parameters

This method accepts the following parameters −

• array: It represent the one dimensional, zero-based array to search.
• match: The predicate that defines the conditions of the element to search for.

Return value

This method returns a Boolean value: true if the array contains an element that matches the given predicate, false if not.

Example 1: Check if an Array Contains a Specific Number

This is the basic example of the Exists() method, that checks whether an array contains the specified number −

using System;

class Program {
   static void Main() {
      int[] numbers = { 1, 2, 3, 4, 5 };

      // Check if the array contains an even number
      bool hasEvenNumber = Array.Exists(numbers, num => num % 2 == 0);

      Console.WriteLine("Contains even number: " + hasEvenNumber);
   }
}

Output

Following is the output −

Contains even number: True

Example 2: Check for an Specific String

This is another example, uses the Exists() method to check if a specified string is present in the array −

using System;

class Program {
   static void Main() {
      string[] names = { "aman", "gupta", "tutorialspoint", "India" };
      bool containsCharlie = Array.Exists(names, name => name == "kumar");
      Console.WriteLine("Contains 'Charlie': " + containsCharlie);
   }
}

Output

Following is the output −

Contains 'Charlie': False

Example 3: Validate an Array of Object

In this example, we create a person object with a name and age. We then use the Exists() method to validate if a person's age is greater than 24 −

using System;

class Person {
   public string Name { get; set; }
   public int Age { get; set; }
}

class Program {
   static void Main() {
      Person[] people = {
         new Person { Name = "Aman", Age = 25 },
         new Person { Name = "Akash", Age = 24 },
         new Person { Name = "Rahul", Age = 23 }
      };

      bool hasOlderThan24 = Array.Exists(people, person => person.Age > 24);

      Console.WriteLine("Contains a person older than 24: " + hasOlderThan24);
   }
}

Output

Following is the output −

Contains a person older than 24: True

Example 4: Check for Null or Empty Strings

Following is another example of the Exists() method. Here, we check for null or empty strings in an array −

using System;

class Program {
   static void Main() {
      string[] strings = { "Hello", "", "World", null };
      bool hasNullOrEmpty = Array.Exists(strings, str => string.IsNullOrEmpty(str));
      Console.WriteLine("Contains null or empty strings: " + hasNullOrEmpty);
   }
}

Output

Following is the output −

Contains null or empty strings: True