private void PackageSolutionAppliances_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
NewPackagedSolutionCmd.NotifyCanExecuteChanged();
SavePackagedSolutionCmd.NotifyCanExecuteChanged();
PrintEnergyLabelCmd.NotifyCanExecuteChanged();
UpdateEei();
}
/// <summary>
/// Adds an appliance to the viewed packaged solution
/// </summary>
/// <param name="appliance"></param>
private void AddApplianceToPackagedSolution(ApplianceInstance appliance)
{
AppliancesInPackagedSolution.Add(appliance);
// Set save state to false
IsDataSaved = false;
// Notify the print function of changes
PrintEnergyLabelCmd.NotifyCanExecuteChanged();
}
/// <summary>
/// Save the viewed packaged solution to the database
/// </summary>
private void SaveCurrentPackagedSolution()
{
/* IMPORTANT
* A packaged solution should not be saved if there exists
* a solar collector without a container tied to it. */
using (var ctx = new AssistantContext())
{
// Copy visible list of appliance instances to the list in the model
var newApplianceInstanceList = AppliancesInPackagedSolution.ToList();
// Mark packaged solution as added if new or modified if old
ctx.Entry(PackagedSolution).State = PackagedSolution.Id == 0 ? EntityState.Added : EntityState.Modified;
// Mark removed appliance instances as deleted
if (PackagedSolution.Id > 0)
{
var previousPackagedSolution = ctx.PackagedSolutions.Include(a => a.ApplianceInstances).FirstOrDefault(p => p.Id == PackagedSolution.Id);
previousPackagedSolution?.ApplianceInstances.ToList().ForEach(instance =>
{
if (newApplianceInstanceList.All(a => a.Id != instance.Id))
{
ctx.Entry(instance).State = EntityState.Deleted;
}
});
}
// Attach appliances and appliance instances to avoid duplicates
foreach (var appInstance in newApplianceInstanceList)
{
ctx.Entry(appInstance.Appliance.DataSheet).State = EntityState.Unchanged;
ctx.Entry(appInstance.Appliance).State = EntityState.Unchanged;
ctx.Entry(appInstance).State = appInstance.Id == 0 ? EntityState.Added : EntityState.Unchanged;
}
// Set new appliance instance list
PackagedSolution.ApplianceInstances = newApplianceInstanceList;
// Set the creation date to now
if (PackagedSolution.CreationDate == default(DateTime))
{
PackagedSolution.CreationDate = DateTime.Now;
}
// Save database changes
ctx.SaveChanges();
}
// Set save state to true and notify print function of change
IsDataSaved = true;
PrintEnergyLabelCmd.NotifyCanExecuteChanged();
}
