private void UpdateBooksPerMonth()
{
// clear the list and the counts
Dictionary <DateTime, List <BookRead> > bookMonths = new Dictionary <DateTime, List <BookRead> >();
if (BooksRead.Count < 1)
{
return;
}
DateTime startDate = BooksRead[0].Date;
DateTime endDate = BooksRead.Last().Date;
endDate = new DateTime(endDate.Year, endDate.Month, endDate.Day, 23, 59, 59);
DateTime monthStart = new DateTime(startDate.Year, startDate.Month, 1);
DateTime monthEnd = monthStart.AddMonths(1).AddSeconds(-1);
// get all the months a book has been read
while (monthStart <= endDate)
{
List <BookRead> monthList = new List <BookRead>();
foreach (BookRead book in BooksRead)
{
if (book.Date >= monthStart && book.Date <= monthEnd)
{
monthList.Add(book);
}
}
if (monthList.Count > 0)
{
bookMonths.Add(monthStart, monthList);
}
monthStart = monthStart.AddMonths(1);
monthEnd = monthStart.AddMonths(1).AddSeconds(-1);
}
TalliedMonths.Clear();
foreach (DateTime date in bookMonths.Keys.OrderBy(x => x))
{
TalliedMonths.Add(new TalliedMonth(date, bookMonths[date]));
}
}
public bool AddNewBook(BookRead newBook, out string errorMsg)
{
errorMsg = "";
// for the moment insist only that the date is after the last of the existing items
if (BooksRead.Last().Date > newBook.Date)
{
errorMsg = "Date must be after last date : " + BooksRead.Last().DateString;
return(false);
}
BooksRead.Add(newBook);
if (DataFromDb)
{
AddNewBookToDatabase(newBook);
}
UpdateCollections();
return(true);
}
