How to Remove Items from Set based on a Condition in C# - Step by Step Examples

How to Remove Items from Set based on a Condition in C# ?

Answer

To remove items from a set based on a condition in C#, you can use the RemoveWhere method to remove elements that match a specified condition.

✐ Examples

1 Removing Even Numbers from Integer Set

In this example,

We create a HashSet named numberSet using the System.Collections.Generic namespace in C#, which contains integer values 1, 2, 3, 4, and 5.
We use the RemoveWhere method of numberSet with a lambda expression to remove even numbers from the set.
Finally, we iterate through the modified set numberSet to see the removed items.

C# Program

using System;
using System.Collections.Generic;

public class Program
{
    public static void Main()
    {
        HashSet<int> numberSet = new HashSet<int> { 1, 2, 3, 4, 5 };
        numberSet.RemoveWhere(n => n % 2 == 0);

        foreach (int num in numberSet)
        {
            Console.Write(num + " ");
        }
    }
}

Output

1 3 5

2 Removing Short Strings from String Set

In this example,

We create a HashSet named stringSet using the System.Collections.Generic namespace in C#, which contains string values "apple", "banana", "cherry", "date", and "grape".
We use the RemoveWhere method of stringSet with a lambda expression to remove strings with length less than 6 characters from the set.
Finally, we iterate through the modified set stringSet to see the removed items.

C# Program

using System;
using System.Collections.Generic;

public class Program
{
    public static void Main()
    {
        HashSet<string> stringSet = new HashSet<string> { "apple", "banana", "cherry", "date", "grape" };
        stringSet.RemoveWhere(s => s.Length < 6);

        foreach (string str in stringSet)
        {
            Console.Write(str + " ");
        }
    }
}

Output

banana cherry

Summary

In this tutorial, we learned How to Remove Items from Set based on a Condition in C# language with well detailed examples.

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How to Remove Items from Set based on a Condition in C# - Step by Step Examples

How to Remove Items from Set based on a Condition in C# ?

Answer

✐ Examples

1 Removing Even Numbers from Integer Set

C# Program

Output

2 Removing Short Strings from String Set

C# Program

Output

Summary

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