How to Convert a Set of Strings to a Set of Integers in C# - Step by Step Examples

How to Convert a Set of Strings to a Set of Integers in C# ?

Answer

To convert a set of strings to a set of integers in C#, you can use LINQ to project each string element to an integer and then create a new HashSet from the projected integers.


✐ Examples

1 Convert Set of Strings to Set of Integers

In this example,

  1. We have a set of strings named stringSet.
  2. We use LINQ's Select method to project each string element to an integer using int.Parse.
  3. We create a new HashSet from the projected integers.

C# Program

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

class Program
{
    static void Main()
    {
        // Set of strings
        var stringSet = new HashSet<string> { "1", "2", "3", "4", "5" };

        // Convert set of strings to set of integers
        var intSet = new HashSet<int>(stringSet.Select(int.Parse));

        // Print the set of integers
        foreach (var i in intSet)
        {
            Console.WriteLine(i);
        }
    }
}

Output

1
2
3
4
5

2 Convert Set of Strings with Error Handling

In this example,

  1. We have a set of strings named stringSet, including an invalid integer string.
  2. We use LINQ's Select method to project each string element to an integer using int.TryParse to handle errors.
  3. We filter out invalid integers using the Where method.
  4. We create a new HashSet from the valid projected integers.

C# Program

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

class Program
{
    static void Main()
    {
        // Set of strings with an invalid integer string
        var stringSet = new HashSet<string> { "1", "2", "3", "invalid", "5" };

        // Convert set of strings to set of integers with error handling
        var intSet = new HashSet<int>(stringSet.Select(s => {
            int.TryParse(s, out int result);
            return result;
        }).Where(i => i != 0));

        // Print the set of integers
        foreach (var i in intSet)
        {
            Console.WriteLine(i);
        }
    }
}

Output

1
2
3
5

Summary

In this tutorial, we learned How to Convert a Set of Strings to a Set of Integers in C# language with well detailed examples.


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