private void ChiTietPhieuMuon_Sach_PropertyChanging(Object sender, PropertyChangingEventArgs e)
{
if (e.PropertyName == nameof(Sach.pid))
{
lb_ThongBaoLoiThemSach.Content = "";
PropertyChangingCancelEventArgs <string> cancelArgs = e as PropertyChangingCancelEventArgs <string>;
if (BiTrungSach(cancelArgs.NewValue))
{
lb_ThongBaoLoiThemSach.Content = "Sách đã được thêm";
datagrid_ChiTietPhieuMuon.CancelEdit();
cancelArgs.Cancel = true;
return;
}
Sach sachTim = SachBUS.Instance.LaySach(cancelArgs.NewValue);
if (sachTim == null)
{
lb_ThongBaoLoiThemSach.Content = "Không tìm thấy sách";
datagrid_ChiTietPhieuMuon.CancelEdit();
cancelArgs.Cancel = true;
}
}
}
protected bool OnPropertyChanging <T>(string propertyName, T originalValue, T newValue)
{
var handler = this.PropertyChanging;
if (handler != null)
{
var args = new PropertyChangingCancelEventArgs <T>(propertyName, originalValue, newValue);
handler(this, args);
return(!args.Cancel);
}
return(true);
}
