Question

我有一个类型对象列表 }

我需要对

列表进行排序

我可以动态地执行此操作吗。

请帮忙。

Answer 1

LINQ有OrderBy / OrderByDescending个方法，这使得这种类型的排序变得微不足道。例如

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

以上称为 Lambda 表达式，如果您更喜欢纯LINQ语法，则在可读性方面要好一些

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;

Answer 2

另一种形式的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;

具体情况，假设您的列表名为MyList，请Restaurant.RestaurantId字段：

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

将按餐厅的ID返回列表，升序

根据评论：你可以做到

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

这样它就会跳过那些空的......

对每个具有对象属性的对象排序对象列表

2 个答案: