CODEWITHSUNDEEP
c#listsorting
user2921973
user2921973

Reputation: 77

Sorting a list of objects each object having object properties

I have a list of objects of type }

I need to sort the list of

Can I do this dynamically.

Please help.

Upvotes: 1

Views: 157

Answers (2)

Noctis
Noctis

Reputation: 11783

And the other form of linq:

var sorted_by_prop = 
        from some_object in list_of_rest
        orderby some_object.prop_name_here descending // or ignore descending if you don't want it descending
        select some_object;

Specific case, assuming your list is called MyList, by Restaurant.RestaurantId field:

var sorted_list = 
        from rest in MyList
        orderby rest.Restaurant.RestaurantId
        select rest;

Will return the list by the Id of the restaurant, ascending

As per comment: You can do 

var sorted_list = 
        from rest in MyList
        where rest.Booking != null && // same for the rest
        orderby rest.Restaurant.RestaurantId
        select rest;

this way it'll skip the ones that are null ...

Upvotes: 0

James
James

Reputation: 82136

LINQ has OrderBy / OrderByDescending methods which make this type of sorting trivial e.g.

var orderByBookingRef = listOfRestaurants.OrderBy(x => x.Booking.BookingRef);
var orderByLatestBooking = listOfRestaurants.OrderByDescending(x => x.Booking.BookingDateTime);
var orderByLatestReview = listOfRestaurants.OrderByDescending(x => x.RestReview.ReviewDate);

The above is known as Lambda expressions which are a bit better in terms of readability, if you prefer pure LINQ syntax 

var orderByBookingRef = from r in listOfRestaurants
                        orderby r.Booking.BookingRef
                        select r;
var orderByLatestBooking = from r in listOfRestaurants
                           orderby r.Booking.BookingDateTime descending
                           select r;
var orderByLatestReview = from r in listOfRestaurants
                          orderby r.RestReview.ReviewDate descending
                          select r;

Upvotes: 2

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