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How to use orderby with 2 fields in linq? [duplicate]

Tags:

c#

linq

People also ask

What is difference between OrderBy and ThenBy in LINQ?

Generally, ThenBy method is used with the OrderBy method. The OrderBy() Method, first sort the elements of the sequence or collection in ascending order after that ThenBy() method is used to again sort the result of OrderBy() method in ascending order.

Is LINQ OrderBy ascending?

In LINQ, the OrderBy operator is used to sort the list/ collection values in ascending order. In LINQ, if we use order by the operator by default, it will sort the list of values in ascending order. We don't need to add any ascending condition in the query statement.

What algorithm does LINQ OrderBy use?

For LINQ to Objects, it's a stable quicksort that is used.


MyList.OrderBy(x => x.StartDate).ThenByDescending(x => x.EndDate);

Use ThenByDescending:

var hold = MyList.OrderBy(x => x.StartDate)
                 .ThenByDescending(x => x.EndDate)
                 .ToList();

You can also use query syntax and say:

var hold = (from x in MyList
           orderby x.StartDate, x.EndDate descending
           select x).ToList();

ThenByDescending is an extension method on IOrderedEnumerable which is what is returned by OrderBy. See also the related method ThenBy.


If you have two or more field to order try this:

var soterdList = initialList.OrderBy(x => x.Priority).
                                    ThenBy(x => x.ArrivalDate).
                                    ThenBy(x => x.ShipDate);

You can add other fields with clasole "ThenBy"


MyList.OrderBy(x => x.StartDate).ThenByDescending(x => x.EndDate);

Note that you can use as well the Descending keyword in the OrderBy (in case you need). So another possible answer is:

MyList.OrderByDescending(x => x.StartDate).ThenByDescending(x => x.EndDate);

VB.NET

 MyList.OrderBy(Function(f) f.StartDate).ThenByDescending(Function(f) f.EndDate)

OR

  From l In MyList Order By l.StartDate Ascending, l.EndDate Descending