My C# is incredibly rusty, so I am having trouble following your code.
Also, there is no backend DB. The data will be extracted at runtime from
various non-structured sources.
On Monday, July 16, 2012 8:18:21 AM UTC-5, srussell705 wrote:
> On Fri, Jul 13, 2012 at 9:15 AM, jtaylor <> wrote:
> > I am building an in-memory DataSet from non-structured data. I need
> > to JOIN and query data across tables. DataTable has a .Select method
> > but DataSet does not. I tried to use LINQ, but it gives me a
> > "Expression of the type 'System.Data.DataTable' is not queryable.
> > Make sure you are not missing an assembly reference and/or namespace
> > import for the LINQ provider.", and I cannot find anything missing.
> >
> > What is the best way to SELECT across tables within a DataSet?
> --------------
>
> Don't use DataSet or DataTable for your container. Put it into an data
> object:
> var myPO = (from p in db.PurchaseOrders
> // Query of data from backend
> where p.dtmAdded >= pastdate
> orderby p.dtmAdded descending
> select new PO
> // Data object loading is below
> {
> dtmAdded = (DateTime)p.dtmAdded,
> errorChecked = (Boolean)p.ErrorChecked,
> poCurrency = p.POCurrency,
> poDate = p.PODate,
> poID = (Int32)p.POID,
> poNumber = p.PONumber,
> poStatus = p.POStatus,
> poTime = p.POTime,
> printed = (Boolean)p.Printed,
> referenceID = p.ReferenceID,
> requestMade = (Boolean)p.RequestMade,
> tradingPartnerID = p.TradingPartnerID
> }).ToList();
> return myPO;
>
>
> --
> Stephen Russell
> Sr. Analyst
> Ring Container Technology
> Oakland TN
>
> 901.246-0159 cell
>
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