public void AddRent()
{
if (null == CurrentPerson)
{
MessageBoxService.Show("请选择借书的人", "提示");
return;
}
if (null == CurrentBook)
{
MessageBoxService.Show("请选择要借的书", "提示");
return;
}
if (null != ToBeRents.FirstOrDefault(e => e.Book == CurrentBook))
{
return;
}
if (CurrentBook.AvailableCount <= 0)
{
MessageBoxService.Show("这本书已经被借空了", "提示");
return;
}
var rent = new Rent
{
Person = CurrentPerson,
Book = CurrentBook,
StartDate = DateTime.Now,
Count = 1,
};
ToBeRents.Add(rent);
}
