Question about Contains : The AsScalarAsync extension...

Thu, 24 May 2012 10:53:21 -700

Author: kimj
Subject: 3451
Posted: 24-May-2012 at 10:53am

The AsScalarAsync extension is used to asynchronously execute what would otherwise be an "immediate execution" query. These are queries using a .First() or .Sum() or .Contains() or similar operator, which because they will be executed immediately and synchronously, are not allowed in Silverlight.

To use .Contains, or .Any, or .Count, which I think would also work in your scenario, you can do something like the following:

var op = repository.Manager.DBOARD.Select(o1 => o1.ID).AsScalarAsync().Contains(dboard.ID);

var op = repository.Manager.DBOARD.Where(o1 => o1.ID == dboard.ID).AsScalarAsync().Any();

var op = repository.Manager.DBOARD.Where(o1 => o1.ID == dboard.ID).AsScalarAsync().Count();

Note that in all cases an EntityScalarQueryOperation is returned, not a query. This is because the query is still executed immediately.

You can read more about AsScalarAsync here - http://drc.ideablade.com/xwiki/bin/view/Documentation/async-immediate-execution

Question about Contains : Hello,I'm writing my first...

Thu, 24 May 2012 01:14:14 -700

Author: pponzano
Subject: 3451
Posted: 24-May-2012 at 1:14am

Hello,
I'm writing my first silverlight application that makes access to the Manager direcly without passing from storedprocedure...
I've got a small issue with the contains...

if I do

var dboard = (sender as RadDataForm).CurrentItem as DBOARD;

var query = repository.Manager.DBOARD.Where(o1 => o1.ID == dboard.ID).AsScalarAsync();
query.ExecuteAsync(op =>
{
op.Results.Cast().Count();
repository.Manager.SaveChangesAsync();
});

It works....

if I do var query = repository.Manager.DBOARD.Contain(dboard) it doesn't have the AsScalarAsync and if I run this I got
Queries in Silverlight must be executed asynchronously.

What am I doing wrong?

Thanks

DevForce Community Forum : Question about Contains

Question about Contains : The AsScalarAsync extension...

Question about Contains : Hello,I'm writing my first...