public ActionResult Create(CreateAuctionForm form)
{
// Validate the model. If that fails, return the user to the original form.
if (!TryValidateModel(form))
{
return View(form);
}
Auction newAuction = null;
// Save the new auction in the database
using (var context = new AuctioneerContext())
{
newAuction = new Auction
{
Name = form.Name,
EndDate = form.EndDate,
Description = form.Description
};
context.Auctions.Add(newAuction);
context.SaveChanges();
}
// Redirect to the details page
return RedirectToAction("Details", new { id = newAuction.Id });
}
private static void SaveBid(int auctionId, decimal amount)
{
using (var context = new AuctioneerContext())
{
var foundAuction = context.Auctions.FirstOrDefault(auction => auction.Id == auctionId);
// Can't accept bids for auctions that don't exist anymore!
if (foundAuction == null)
{
throw new ArgumentException("The specified auction does not exist", "auctionId");
}
// Can't accept bids for auctions that have been closed or sold
if (foundAuction.EndDate < DateTime.Now)
{
throw new InvalidOperationException("This auction has already been closed.");
}
decimal highestBid = 0;
if (foundAuction.Bids.Count > 0)
{
highestBid = foundAuction.Bids.Max(bid => bid.Amount);
}
// Only higher bids are allowed for the auction
if (highestBid >= amount)
{
throw new ArgumentException("The placed bid isn't higher than the previous bid", "amount");
}
Bid newBid = new Bid()
{
Amount = amount,
Auction = foundAuction,
DatePosted = DateTime.Now,
PostedBy = HttpContext.Current.User.Identity.Name
};
// Save the new bid in the database
context.Bids.Add(newBid);
foundAuction.Bids.Add(newBid);
using (var transaction = new TransactionScope())
{
context.SaveChanges();
transaction.Complete();
}
}
}
/// <summary>
/// Displays the details for an existing auction
/// </summary>
/// <param name="id"></param>
/// <returns></returns>
public ActionResult Details(int id)
{
Auction foundAuction = null;
// Retrieve the auction from the database
using (var context = new AuctioneerContext())
{
foundAuction = context.Auctions
.Include("Bids")
.FirstOrDefault(auction => auction.Id == id);
}
if (foundAuction == null)
{
// A true website does not display data that does not exist.
// So instead throw an error and let the rest of the infrastructure handle the mess.
throw new HttpException(404, "Auction not found");
}
return View(foundAuction);
}
/// <summary>
/// Displays all the running auctions
/// </summary>
/// <returns></returns>
public ActionResult Index()
{
List<Auction> auctions = null;
using (var context = new AuctioneerContext())
{
auctions = context.Auctions
.OrderByDescending(auction => auction.EndDate)
.ToList();
}
return View(auctions);
}
