Question

For the following code

using (Xtensive.Storage.Session.Open(doc.D4.domain)) using (var t = Xtensive.Storage.Transaction.Open()) {
      ..........
      t.Complete();
}

I get the following error:

'Xtensive.Storage.TransactionScope' does not contain a definition for 'Complete' and no extension method 'Complete' accepting a first argument of type 'Xtensive.Storage.TransactionScope' could be found (are you missing a using directive or an assembly reference?)

when I put in

using Xtensive.Storage;

and remove Xtensive.Storage. from the code, no errors.

This thread was imported from our support forum. The original discussion may contain more detailed answer. Original topic by Anonymous.

Answer 1

That's because Complete is extension method defined in TransactionScopeExtensions.

Why it is implemented as an extension method? Transaction.Open may return null if there is already opened transaction. "using" block in C# understands this case, but ts.Complete() would fail.

Why Transaction.Open returns null? Well, this is the fastest way to say "do nothing, it's already open". No allocations = better performance.

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