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Asked: 2026-05-11T07:54:14+00:00

Can someone explaing why existence of the following linq query… (from e in db.Clients

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Can someone explaing why existence of the following linq query…

(from e in db.Clients                     let                         log = (from f in db.CreditsafeLogs where f.Vat.Equals(e.VAT) orderby f.Sent descending select f).FirstOrDefault()                     where                         e.DeleteFlag.Equals('n') &&                         e.Active == true &&                         log != null &&                         log.Approved == false                     select e.Id)

compiles, but in runtime breaks the application (even though it’s never called), while it’s equivalent 

Clients    .Select (       e =>           new            {             e = e,              log = CreditsafeLogs                .Where (f => f.Vat.Equals (e.VAT))                .OrderByDescending (f => f.Sent)                .FirstOrDefault ()          }    )    .Where (       temp0 =>              (((temp0.e.DeleteFlag.Equals ('n') && (temp0.e.Active == (Boolean?)True)) &&                    (temp0.log != null)                ) &&                 (temp0.log.Approved == False)             )    )    .Select (temp0 => temp0.e.Id)

Works fine??

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1 Answer

  1. Since we have no way of reproducing it, can you define ‘breaks the application’? Can you cite the error message please? For info, I have occasionally seen the expression compiler make dubious decisions about nullability – for more see here. This might be related, but impossible to say without the error message.

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