#Net5 – C#9 “records” and “deconstruction” super cool feature 🆒🆒🆒

Hi !

I’m still learning about C#9, and there is a lot to learn about records. And, between all this information, I Just learn a super cool feature related to records: deconstruction.

Let’s start with a simple record definition for a pet. This one includes pet’s name and pet’s age:

public record Pet
{
    public string Name { get; init; }
    public int Age { get; init; }
    public Pet(string name, int age)
        => (Name, Age) = (name, age);
}

This is fine, init only properties (cool feature!) and we can access the values as usual.

static void Main(string[] args)
{
    var pet = new Pet("Goku", 2);

    // get pet info, standard way
    var gokuName = pet.Name;
    var gokuAge = pet.Age;
}

So far, so good. However, if you like clean code, we can improve this a little using some new features in C#9. So, let’s start with much simpler record definition.

public record NewPet(string Name, int Age);

And we can access the pet properties using deconstruction (new term for me!)

// get pet info, C#9 deconstruction
var newPet = new NewPet("Goku", 2);
var (gokuName, gokuAge) = newPet;

I like this new one 👆 too ! I’ll always like features that improves readability and saves us a lot of extra code.

References

• What’s new in C# 9.0
• Avoid C# 9 Record Gotchas
  

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