Comments on: Using IDisposables with LINQ

By: Keith Dahlby

Keith Dahlby — Wed, 29 Jul 2009 19:19:03 +0000

@Steve ~

You are indeed correct. However, that workaround doesn’t have the desired effect of allowing additional manipulation of the original query with its original provider. Instead, we’ll just get an IQueryable that uses LINQ to Objects under the hood – we might as well just return IEnumerable!

I have a post in the works with an actual fix for IQueryable.

Cheers ~
Keith

By: Scott Hanselman

Scott Hanselman — Wed, 29 Jul 2009 01:52:23 +0000

I love this. I’ve forwarded it to the C# designers.

By: Steve

Steve — Mon, 27 Jul 2009 15:13:26 +0000

The code above – does require to be used with a ‘AsQueryable’ to get it to build.

ie.
IQueryable MyFunc(string myValue)
{
return (from dc in new MyDataContext().Use()
from row in dc.MyTable
where row.MyField == myValue
select row).AsQueryable();
}

By: Steve

Steve — Mon, 27 Jul 2009 14:40:05 +0000

I was incorrect on my last post – it is working as expected.

I did a Count(), then attempted to loop over the collection in my test – after the count call it was disposed.

By: Steve

Steve — Mon, 27 Jul 2009 14:31:02 +0000

When I call result.Count on a similiar example of above I get an error:

System.ObjectDisposedException: Cannot access a disposed object.
Object name: ‘DataContext accessed after Dispose.’.

Isn’t this code to prevent that from occuring ?

By: Alastair Smith

Alastair Smith — Fri, 24 Jul 2009 13:07:26 +0000

Wow, that’s a really elegant solution!