CODEWITHSUNDEEP
entity-frameworksql-order-by
Tim Shults
Tim Shults

Reputation: 627

.NET Framework 3.5 EntityCollection OrderBy Question

I'm using .NET Framework 3.5 with ASP.NET MVC and I'm using Linq To Entity for my data objects.

I have a Promotion Object that has a 1 to many relationship to the Location object.

What I want to do is take the collection of Locations from the Promotion object and sort those without putting them into another variable. Something like...

promotionEntity.Locations.OrderBy(l => l.Distance);

But it does nothing to the *.Locations collections. Is there a way that I can have that EntityCollection sorted how I need without putting it in another List or variable?

Thanks.

Upvotes: 1

Views: 1916

Answers (2)

Morteza Manavi
Morteza Manavi

Reputation: 33216

One way is to use EntityCollection.CreateSourceQuery Method:

var promotionEntity = context.Promotions.First();
var sq = product.Locations.CreateSourceQuery().OrderBy(l => l.Distance);
promotionEntity.Locations.Attach(sq);

Or if you don't care about the resultant object's type can do projection inside an anonymous type:

var promotionEntity = context.Promotions.Select(p => new 
{
    p,
    Locations = p.Locations.OrderBy(l => l.Distance)
}).First();

Upvotes: 0

mtreit
mtreit

Reputation: 808

If the type of locations is IEnumerable you can just assign the result of OrderBy:

promotionEntity.Locations = promotionEntity.Locations.OrderBy(l => l.Distance)

If the type is something like List<Location> then you will probably have to create a new List:

promotionEntity.Locations = new List<Location>(promotionEntity.Locations.OrderBy(l => l.Distance));

Upvotes: 1

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