private void btnDel_Click(object sender, EventArgs e)
{
DialogResult question = MessageBox.Show("Are you sure?", "All books for this author will be deleted!", MessageBoxButtons.YesNo);
if (question == DialogResult.Yes)
{
//========================= Author-un silinmesi ====================================
// downcast edirik ve comboBoxda secilmish author ID nomresini authorID-ye veririk
string authorID = ((AuthorComboBox)cmbAuthorList.SelectedItem).Value;
// AuthorList-den secilmish author ID-ye gore tapib veririk Author tipinde authorToDeleted-e
// bir nov apcast olunur ki Author-un icinden lazim olana catsin
Author authorToDeleted = AuthorList.GetAuthorByID(authorID);
// AuthorList-den Author classina girib Authors siyahisindan
// ID-ci uyqun geleni silirik
AuthorList.Authors.Remove(authorToDeleted);
//==================================================================================
//=========== Silinen Author-un Book siyahisinin silinmesi =====================//
// silinen group-un icindeki studentleri yeni List massivine yiqiriq
List <Book> bookToBedeleted = BookList.GetBookByGroup(authorToDeleted);
// ve hemin massiv siralanir ve siyahidaki bookName-ler silinir
foreach (Book bookName in bookToBedeleted)
{
BookList.Books.Remove(bookName);
}
UpdateAuthorList();
}
else
{
MessageBox.Show("You are cancelled deletion!");
}
}
private void btnAdd_Click(object sender, EventArgs e)
{
string bookName = txtBookName.Text;
string bookGenre = txtBookGenre.Text;
string bookPrice = txtPrice.Text;
//string bookAuthor = txtAuthorName.Text;
string bookDescript = txtBookDascript.Text;
// secilmish qrupun ID nomresinin groupID-ye verilmesi
string authorId = ((BookComboBox)cmbAuthor.SelectedItem).Value;
// Author tipinden deyishen yaradiriq
// ve author siyahisinin ID-lerinden secilmishini deyishene veririk
Author selectedAuthor = AuthorList.GetAuthorByID(authorId);
if (selectedAuthor == null) // eger secilmish author yoxdursa
{
MessageBox.Show("Author doesn't exist");
return;
}
if (string.IsNullOrEmpty(bookName))
{
// ERROR mesajinin verilmersi
MessageBox.Show("Book name is not valid", "Failed!",
MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
if (string.IsNullOrEmpty(bookGenre))
{
// ERROR mesajinin verilmersi
MessageBox.Show("Book genre is not valid", "Failed!",
MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
if (string.IsNullOrEmpty(bookDescript))
{
// ERROR mesajinin verilmersi
MessageBox.Show("Book description is not valid", "Failed!",
MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
if (string.IsNullOrEmpty(bookPrice))
{
// ERROR mesajinin verilmersi
MessageBox.Show("Book price is not valid", "Failed!",
MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
// eger AuthorListde bu ad varsa
if (BookList.ContainsBookName(bookName))
{
// ERROR mesaji verilir
MessageBox.Show("Book name is duplicate", "Failed!",
MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
BookList.AddBook(new Book {
BookName = bookName,
BookJenre = bookGenre,
Price = bookPrice,
Description = bookDescript,
Authors = selectedAuthor,
});
txtBookName.Text = "";
txtBookGenre.Text = "";
txtBookDascript.Text = "";
txtPrice.Text = "";
}