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);
}
public void ConfirmRent()
{
if (null == CurrentPerson)
{
MessageBoxService.Show("请选择借书的人", "提示");
return;
}
if (ToBeRents.Count == 0)
{
MessageBoxService.Show("请选择要借的书", "提示");
return;
}
var tmp = ToBeRents.FirstOrDefault(e => e.Count > e.Book.AvailableCount);
if (null != tmp)
{
MessageBoxService.Show(string.Format("[{0}]的数量超出了现有数量", tmp.Book.Name), "提示");
return;
}
var toRentCount = ToBeRents.Sum(e => e.Count);
if (toRentCount + _rentCount > _canRentCount)
{
MessageBoxService.Show(string.Format("已借出{0}本 + 将借{1}本 > {2}本，每个人在借数量不超过{2}本",
_rentCount, toRentCount, _canRentCount), "提示");
return;
}
var sb = new StringBuilder();
sb.AppendLine(string.Format("[{0}]将借出以下书籍：", CurrentPerson.Name));
foreach (var item in ToBeRents)
{
sb.AppendLine(string.Format("《{0}》 {1}本", item.Book.Name, item.Count));
}
var log = sb.ToString();
sb.AppendLine("是否确认？");
if (MessageBoxService.Show(sb.ToString(), "提示", MessageBoxButton.YesNo) == MessageBoxResult.No)
{
return;
}
Rent();
Logger.DebugFormat("借出，{0}", log);
}