I'm having an issue with the following code:
private void DataPortal_Fetch(TaskCriteria criteria)
{
using (var ctx = ContextManager<Gimli.Data.GimliDataContext>
.GetManager(Database.ApplicationConnection, false))
{
this.RaiseListChangedEvents = false;
this.IsReadOnly = false;
IQueryable<Data.Task> query = ctx.DataContext.Tasks;
if (criteria.ReadyForPricing)
{
query = query.Where(row => row.IsPriced != true);
query = query.Where(row => row.Status == (int)TaskStatus.Closed);
query = query.Where(row => row.InvoiceId == Guid.Empty);
}
if (criteria.ReadyForInvoicing)
{
query = query.Where(row => row.IsPriced == true);
query = query.Where(row => row.Status == (int)TaskStatus.Closed);
query = query.Where(row => row.InvoiceId == Guid.Empty);
}
var data = query.Select(row => TaskInfo.FetchTaskInfo(row));
this.AddRange(data);
this.IsReadOnly = true;
this.RaiseListChangedEvents = true;
}
}
My web application, when it calls this method, always hangs if I don't comment out the following line:
query = query.Where(row => row.InvoiceId == Guid.Empty
Any idea why this would be happening?
Try changing the code to:
Post back if that helped...
The following code works ... interestingly enough ... any idea of why?
It could be because of how the lambda is interpreted; with "Guid.Empty", the "Guid.Empty" is part of the final lambda. I wonder whether the LINQ-provider is treating this as a special case somehow?
You could try:
But actually, other than
Guid
vs some compiler-generated capture class, the expression tree for this is the same (they both involve lambda=>BinaryExpression=>MemberExpression).If the above also complains, then try putting a TSQL trace on, or enabling your LINQ-providers logging - for LINQ-to-SQL, something like below works (don't quote me!):
@BFree ... Tried what you suggested ... and still do the same thing. It's odd, I can run the following code in LinqPad with no problem:
As well as I can use the following line of code with not problems either:
It's just when I use Guid.Empty. Just plain odd.