public virtual void Update <T>(T entity, params Expression <Func <T, object> >[] updatedProperties) where T : class
{
//dbEntityEntry.State = EntityState.Modified; --- I cannot do this.
//Ensure only modified fields are updated.
var dbEntityEntry = _context.Entry(entity);
if (updatedProperties.Any())
{
//update explicitly mentioned properties
foreach (var property in updatedProperties)
{
dbEntityEntry.Property(property).IsModified = true;
}
}
else
{
//no items mentioned, so find out the updated entries
foreach (var property in dbEntityEntry.OriginalValues.PropertyNames)
{
var original = dbEntityEntry.OriginalValues.GetValue <object>(property);
var current = dbEntityEntry.CurrentValues.GetValue <object>(property);
if (original != null && !original.Equals(current))
{
dbEntityEntry.Property(property).IsModified = true;
}
}
}
}
private void Save()
{
//MyUtils.ValidateSessions(Exchange.Sessions.ToList<ISession>(), out List<string> errors);
var nameExists = context.Exchanges.Any(x => x.Name == Exchange.Name);
if (nameExists && originalExchange?.Name != Exchange.Name)
{
MessageBus.Current.SendMessage("Name already exists, please change it.");
return;
}
if (Title == TitleForAdd)
{
ExchangesViewModel.Exchanges.Add(Exchange);
}
else
{
//_context.Exchanges.Attach(_originalExchange);
context.Entry(originalExchange).CurrentValues.SetValues(Exchange);
context.SaveChanges();
}
}