private void InvokeAction(HttpActionDescriptor action, object[] parameters, ChangeSetEntry changeSetEntry)
{
try
{
Collection <HttpParameterDescriptor> pds = action.GetParameters();
Dictionary <string, object> paramMap = new Dictionary <string, object>(pds.Count);
for (int i = 0; i < pds.Count; i++)
{
paramMap.Add(pds[i].ParameterName, parameters[i]);
}
// TODO - Issue #103
// This method is not correctly observing the execution results, the catch block below is wrong.
// Submit should be Task<bool>, not bool, and should model bind for the CancellationToken which would then
// be propagated through to all the helper methods (one or more of which might also need to be made async,
// once we start respecting the fact that the read/write actions should be allowed to be async).
action.ExecuteAsync(ActionContext.ControllerContext, paramMap, CancellationToken.None);
}
catch (TargetInvocationException tie)
{
ValidationException vex = tie.GetBaseException() as ValidationException;
if (vex != null)
{
ValidationResultInfo error = new ValidationResultInfo(vex.Message, 0, String.Empty, vex.ValidationResult.MemberNames);
if (changeSetEntry.ValidationErrors != null)
{
changeSetEntry.ValidationErrors = changeSetEntry.ValidationErrors.Concat(new ValidationResultInfo[] { error }).ToArray();
}
else
{
changeSetEntry.ValidationErrors = new ValidationResultInfo[] { error };
}
}
else
{
throw;
}
}
}
/// <summary>
/// This method invokes the user overridable <see cref="PersistChangeSet"/> method wrapping the call
/// with the appropriate exception handling logic. All framework calls to <see cref="PersistChangeSet"/>
/// must go through this method. Some data sources have their own validation hook points,
/// so if a <see cref="ValidationException"/> is thrown at that level, we want to capture it.
/// </summary>
/// <returns>True if the <see cref="ChangeSet"/> was persisted successfully, false otherwise.</returns>
private bool PersistChangeSetInternal()
{
try
{
PersistChangeSet();
}
catch (ValidationException e)
{
// if a validation exception is thrown for one of the entities in the changeset
// set the error on the corresponding ChangeSetEntry
if (e.Value != null && e.ValidationResult != null)
{
IEnumerable <ChangeSetEntry> updateOperations =
ChangeSet.ChangeSetEntries.Where(
p => p.Operation == ChangeOperation.Insert ||
p.Operation == ChangeOperation.Update ||
p.Operation == ChangeOperation.Delete);
ChangeSetEntry operation = updateOperations.SingleOrDefault(p => Object.ReferenceEquals(p.Entity, e.Value));
if (operation != null)
{
ValidationResultInfo error = new ValidationResultInfo(e.ValidationResult.ErrorMessage, e.ValidationResult.MemberNames);
error.StackTrace = e.StackTrace;
operation.ValidationErrors = new List <ValidationResultInfo>()
{
error
};
}
}
else
{
throw;
}
}
return(!ChangeSet.HasError);
}
