How to Filter Elements of an Array based on a Condition in C# - Step by Step Examples

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How to Filter Elements of an Array based on a Condition in C# ?

Answer

To filter elements of an array based on a condition in C#, you can use LINQ's Where method.

✐ Examples

1 Filter Even Numbers

In this example,

We have an array named numbers containing integers.
We use LINQ's Where method with a lambda expression to filter out even numbers.
We print the filtered array to demonstrate the filtering.

C# Program

using System;
using System.Linq;
class Program
{
    static void Main()
    {
        int[] numbers = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
        var evenNumbers = numbers.Where(n => n % 2 == 0);
        foreach (var num in evenNumbers)
        {
            Console.Write(num + " ");
        }
    }
}

Output

2 4 6 8 10

2 Filter Strings by Length

In this example,

We have an array named words containing strings.
We use LINQ's Where method with a lambda expression to filter strings by their length.
We print the filtered array to demonstrate the filtering.

C# Program

using System;
using System.Linq;
class Program
{
    static void Main()
    {
        string[] words = { "apple", "banana", "cherry", "date", "fig" };
        var filteredWords = words.Where(word => word.Length > 5);
        foreach (var word in filteredWords)
        {
            Console.Write(word + " ");
        }
    }
}

Output

banana cherry

Summary

In this tutorial, we learned How to Filter Elements of an Array based on a Condition in C# language with well detailed examples.

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