private void listBoxLibraryBooks_DoubleClick(object sender, EventArgs e)
{
// It is important to make sure something in the ListBox is selected.
// (The user could have double clicked on the ListBox control when it was empty).
if (listBoxLibraryBooks.Items.Count == 0)
{
MessageBox.Show("List is empty", "Library Book Viewer"
, MessageBoxButtons.OK, MessageBoxIcon.Information);
}
else if (listBoxLibraryBooks.SelectedIndex == -1)
{
MessageBox.Show("Please select an item to display", "Library Book Viewer"
, MessageBoxButtons.OK, MessageBoxIcon.Information);
}
else
{
// Get a reference to the LibraryBook object the corresponds to the selected
// ListBox item. Use the 'as' operator to do two things: 1) attempt to cast
// from object to LibraryBook, and 2) verify that the object is really a LibraryBook
// ('as' returns null if the cast fails).
LibraryBook libraryBook = listBoxLibraryBooks.SelectedItem as LibraryBook;
// Display the selected library book.
LibraryBookDialog dlg = new LibraryBookDialog();
dlg.LibraryBook = libraryBook;
dlg.Mode = LibraryBookDialog.EditMode.View;
dlg.ShowDialog();
dlg.Dispose();
}
}
private void buttonNew_Click(object sender, EventArgs e)
{
LibraryBookDialog dlg = new LibraryBookDialog();
dlg.Mode = LibraryBookDialog.EditMode.Edit;
if (dlg.ShowDialog() == DialogResult.OK)
{
listBoxLibraryBooks.Items.Add(dlg.LibraryBook);
}
dlg.Dispose();
}