ChangeOperationResponse Classe

Definizione

public ref class ChangeOperationResponse sealed : System::Data::Services::Client::OperationResponse

public sealed class ChangeOperationResponse : System.Data.Services.Client.OperationResponse

type ChangeOperationResponse = class
    inherit OperationResponse

Public NotInheritable Class ChangeOperationResponse
Inherits OperationResponse

Ereditarietà

Object

OperationResponse

ChangeOperationResponse

Esempio

Nel codice seguente viene illustrato come elaborare i risultati di una chiamata a SaveChanges.

DataServiceContext service = new DataServiceContext(new Uri("http://myserviceroot"));

// Do insert, update, delete, or attach operations.

DataServiceResponse dsr;

try
{
    dsr = service.SaveChanges(SaveChangesOptions.Batch);
   // Or service.SaveChanges(SaveChangesOptions.ContinueOnError);
   //Or service.SaveChanges();
   // If there are no errors during save changes, process the results:

    if (dsr.IsBatchResponse)
    {
           /*inspect HTTP artifacts associated with the entire batch:
                             dsr.BatchHeaders, dsr.BatchStatusCode*/ }

    foreach (ChangeOperationResponse cor in dsr)
    {

            if (cor.Descriptor is EntityDescriptor)
            {
                EntityDescriptor ed = (EntityDescriptor)cor.Descriptor;
                // This should be the case if
                // SaveChanges did not throw an exception.

                // After an entity is processed by SaveChanges,
                // it is always moved to the unchanged state.
                System.Diagnostics.Debug.Assert(
                           ed.State == EntityStates.Unchanged);
                // This shows that the state should be unchanged if
                // the result is success.

                //process the entity in the response payload: ed.Entity
            }
            else if (cor.Descriptor is LinkDescriptor)
            {
                LinkDescriptor ld = (LinkDescriptor)cor.Descriptor;
               // This should be the case if SaveChanges did not throw an exception.

               // After an entity is processed by SaveChanges it
               // is always moved to the unchanged state.
                System.Diagnostics.Debug.Assert(
                            ld.State == EntityStates.Unchanged);
                // The state should be unchanged if the result is success.

                //process the link in the response payload: ld.Source,
                // ld.SourceProperty, or ld.Target.
            }
     }

}
catch (DataServiceSaveException se)
{
    // Error while saving changes
    dsr = se.Response;

    if (dsr.IsBatchResponse)
    {
        /*inspect HTTP artifacts associated with the entire batch:
             dsr.BatchHeaders, dsr.BatchStatusCode*/
}
}

    foreach (ChangeOperationResponse cor in dsr)
    {
        if (cor.Error != null)
        {
            //process error
        }
        else
        {
            // same success case processing as in the loop over DSRs results in
            // the try block. You could put that processing in a method
            // and call it from here.
        }
    }

}

 catch(Exception)
 {
    // Error while saving changes, but not thrown by the client library.

    // Process ArgumentException, InvalidOperationException, or similar.
}
}

Commenti

ChangeOperationResponse gli oggetti non devono essere costruiti direttamente da un utente di questa libreria. I riferimenti vengono invece restituiti durante l'enumerazione delle risposte dell'operazione restituite tramite l'enumeratore nella DataServiceResponse classe .

SaveChanges invia le modifiche in sospeso al servizio dati raccolto dall'ultima DataServiceContext chiamata a SaveChanges. Le modifiche vengono aggiunte al contesto chiamando AddObject, AddLink, DeleteObjectDeleteLink, Detach, , DetachLink, e metodi simili.

SaveChanges restituisce un DataServiceResponse oggetto che rappresenta la risposta a tutte le operazioni inviate al servizio dati. L'oggetto DataServiceResponse include una sequenza di ChangeOperationResponse oggetti che, a sua volta, contengono una sequenza di EntityDescriptor istanze o LinkDescriptor che rappresentano le modifiche persistenti o tentate.