Best way to assign a value to a property of all objects in a collection using LINQ

Question

I have a Car object with a ResaleValue property, and I have a collection of these car objects stored in:

 IEnumerable<Car>

I also have a ResaleCalculator() with a calculate method.

Is there a way in linq to apply a calculation and set the ResaleValue property of every object in the collection without a loop?

Answer 1

You don't really want to use LINQ for this. Firstly, you're not avoiding a loop, you are merely abstracting it away. Secondly, LINQ methods are intended to filter and/or project a sequence, not mutate it. While you could use the .ForEach instance method on List<T> to not explicitly write a loop, it is hardly clearer than simply coding the loop to do what you need it to do.

Answer 2

I think this will do what you want

cars.Select(c=>c.ResaleValue = c.Calculate());