EP 65 : Primary Constructor in C#

Read Time : 1 Mins

• What is the primary constructor?

• Understanding with example

• Benefits of using them

What is the primary constructor?

Primary constructors were introduced in .NET 8 and C# 12, a cleaner way of constructor initialization. We can use this syntax where we have a lot of constructor injections.

Understanding the Primary Constructor with Code

Let’s understand it with a simple example first before diving in depth. The older way of constructor injection :

public sealed class NewsletterService
{
    private readonly INewsletterRepository _newsletterRepository;

    public NewsletterService(INewsletterRepository newsletterRepository)
    {
        _newsletterRepository = newsletterRepository;
    }
}

This is how we can achieve the same with primary constructors:

internal class NewsletterService(INewsletterRepository newsletterRepository)
{
    public void Subscribe(string email)
    {
        newsletterRepository.Add(email);
    }
}

Pro(s) :

The following are the benefits of using primary constructors :

1. It removes a lot of boilerplate code

2. Simplifies the syntax

3. Much more readability

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