ObjectQuery extensions from managed C++/CLI

Question

I'm trying to move a project over to using Entity Framework, but to make it more fun, the project is in C++/CLR.

I've got a query

ObjectQuery<myData::Facility^>^ facQ = myContext->FacilitySet;

and I want to do this

int n = facQ.Count()

But I can't because c++ doesn't recognise extension methods using C# syntax. facQ->Count() doesn't work.

Any ideas?

(I'm using visual studio 2008, and .NET 3.5).

You just need to find the namespace and class that static method is defined in — Yochai Timmer, Jul 25 '12 at 05:12
@YochaiTimmer okay, how do I do that? it's not on the MSDN page, and System::Data::Objects::ObjectQuery doesn't seem to have it. — Melanie, Jul 25 '12 at 05:14

score 2 · Accepted Answer · edited May 23 '17 at 12:29

2

System::Data::Objects::ObjectQuery implements IEnumerable<T>. The Count() method you see in C# is from the System::Linq::Enumerable class.

using namespace System::Linq;

int n = Enumerable::Count(facQ);

Also see this answer, which shows a couple examples of calling other extension methods in that class.

edited May 23 '17 at 12:29

Community

answered Jul 25 '12 at 17:21

David Yaw

1 Answers1