Should I return IEnumerable<T> or IQueryable<T> from my DAL?
- by Gary '-'
I know this could be opinion, but I'm looking for best practices.
As I understand, IQueryable implements IEnumerable, so in my DAL, I currently have method signatures like the following:
IEnumerable<Product> GetProducts();
IEnumerable<Product> GetProductsByCategory(int cateogoryId);
Product GetProduct(int productId);
Should I be using IQueryable here?
What are the pros and cons of either approach?
Note that I am planning on using the Repository pattern so I will have a class like so:
public class ProductRepository {
DBDataContext db = new DBDataContext(<!-- connection string -->);
public IEnumerable<Product> GetProductsNew(int daysOld) {
return db.GetProducts()
.Where(p => p.AddedDateTime > DateTime.Now.AddDays(-daysOld ));
}
}
Should I change my IEnumerable<T> to IQueryable<T>? What advantages/disadvantages are there to one or the other?
