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

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

Answer

To filter elements of a list based on a condition in C#, you can use LINQ queries or the Where method along with lambda expressions.

✐ Examples

1 Filter Integers Greater Than a Threshold

In this example,

We create a list named numbers with integer values.
We use LINQ query syntax to filter elements greater than a threshold value.
Finally, we print the filtered list to standard output.

C# Program

using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main()
    {
        List<int> numbers = new List<int> { 1, 2, 3, 4, 5 };
        int threshold = 3;
        var filteredNumbers = from num in numbers
                              where num > threshold
                              select num;
        foreach (var num in filteredNumbers)
        {
            Console.Write(num + " ");
        }
    }
}

Output

4 5

2 Filter Strings Containing a Substring

In this example,

We create a list named words with string values.
We use the Where method along with a lambda expression to filter elements containing a specific substring.
Finally, we print the filtered list to standard output.

C# Program

using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main()
    {
        List<string> words = new List<string> { "apple", "banana", "cherry", "date", "elderberry" };
        string substring = "erry";
        var filteredWords = words.Where(word => word.Contains(substring));
        foreach (var word in filteredWords)
        {
            Console.Write(word + " ");
        }
    }
}

Output

cherry elderberry

Summary

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

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

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

Answer

✐ Examples

1 Filter Integers Greater Than a Threshold

C# Program

Output

2 Filter Strings Containing a Substring

C# Program

Output

Summary

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