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

This question already has answers here: Multiple "order by" in LINQ (7 answers) Closed 4 years ago.

Say I have these values in a 开发者_如何学JAVAdatabase table

id = 1
StartDate = 1/3/2010
EndDate =  1/3/2010

id = 2
StartDate = 1/3/2010
EndDate = 1/9/2010

Now I have so far this orderby for my linq

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

I want to order it however also using the end date.

Like so the order I would want this in as

id 2
id 1

So endDates that are greater go first. I am not sure if I need to change this to use some compare function or something.

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

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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.

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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);

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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