/// <summary>
/// Validates the specified Fillup and then, if it is valid, adds it to
/// Car.FillupHistory collection.
/// </summary>
/// <param name="fillup">The fill-up to save.</param>
/// <param name="errorCallback">The action to execute if the storage
/// attempt fails.</param>
/// <returns>The validation results.</returns>
public static SaveResult SaveFillup(Fillup fillup, Action errorCallback)
{
var lastReading =
Car.FillupHistory.Count > 0 ?
Car.FillupHistory.First().OdometerReading :
Car.InitialOdometerReading;
fillup.DistanceDriven = fillup.OdometerReading - lastReading;
var saveResult = new SaveResult();
var validationResults = fillup.Validate();
if (validationResults.Count > 0)
{
saveResult.SaveSuccessful = false;
saveResult.ErrorMessages = validationResults;
}
else
{
Car.FillupHistory.Insert(0, fillup);
saveResult.SaveSuccessful = true;
SaveCar(delegate {
saveResult.SaveSuccessful = false;
errorCallback();
});
}
return(saveResult);
}
/// <summary>
/// Initializes the view and its data context.
/// </summary>
private void InitializePageState()
{
// CarHeader.DataContext = CarDataStore.Car;
DataContext = _currentFillup =
State.ContainsKey(CURRENT_FILLUP_KEY) ?
(Fillup)State[CURRENT_FILLUP_KEY] :
new Fillup { Date = DateTime.Now };
_hasUnsavedChanges = State.ContainsKey(HAS_UNSAVED_CHANGES_KEY) && (bool)State[HAS_UNSAVED_CHANGES_KEY];
}
/// <summary>
/// Validates the specified Fillup and then, if it is valid, adds it to
/// Car.FillupHistory collection.
/// </summary>
/// <param name="fillup">The fill-up to save.</param>
/// <param name="errorCallback">The action to execute if the storage
/// attempt fails.</param>
/// <returns>The validation results.</returns>
public static SaveResult SaveFillup(Fillup fillup, Action errorCallback)
{
var lastReading =
Car.FillupHistory.Count > 0 ?
Car.FillupHistory.First().OdometerReading :
Car.InitialOdometerReading;
fillup.DistanceDriven = fillup.OdometerReading - lastReading;
var saveResult = new SaveResult();
var validationResults = fillup.Validate();
if (validationResults.Count > 0)
{
saveResult.SaveSuccessful = false;
saveResult.ErrorMessages = validationResults;
}
else
{
Car.FillupHistory.Insert(0, fillup);
saveResult.SaveSuccessful = true;
SaveCar(delegate {
saveResult.SaveSuccessful = false;
errorCallback(); });
}
return saveResult;
}
