public void AddToCart(int albumId)
{
// TODO: Verify that the Album Id exists in the database.
Cart cartItem = db.Carts.SingleOrDefault(c => c.CartId == this.ShoppingCartId && c.AlbumId == albumId);
if (cartItem == null)
{
// Item is not in cart; add new cart item
cartItem = new Cart()
{
CartId = this.ShoppingCartId,
AlbumId = albumId,
Count = 1,
DateCreated = DateTime.Now
};
db.Carts.Add(cartItem);
}
else
{
// Item is already in cart; increase item count (quantity)
cartItem.Count++;
}
db.SaveChanges();
}
public void AddToCart(Album album)
{
// Get the matching cart and album instances
var cartItem = storeDB.Carts.SingleOrDefault(
c => c.CartId == ShoppingCartId &&
c.AlbumId == album.AlbumId);
if (cartItem == null)
{
// Create a new cart item if no cart item exists
cartItem = new Cart
{
AlbumId = album.AlbumId,
CartId = ShoppingCartId,
Count = 1,
DateCreated = DateTime.Now
};
storeDB.Carts.Add(cartItem);
}
else
{
// If the item does exist in the cart, then add one to the quantity
cartItem.Count++;
}
// Save changes
storeDB.SaveChanges();
}
/*将专辑对象作为参数传入方法，添加专辑到购物车中，在 Cart 表中跟踪每个专辑的数量，
*在这个方法中，我们将会检查是在表中增加一个新行，还是仅仅在用户已经选择的专辑上增加数量*/
public void AddToCart(Album album)
{
// Get the matching cart and album instances
//检查该专辑是否已经在购物车中
var cartItem = storeDB.Carts.SingleOrDefault(
c => c.CartId == ShoppingCartId &&
c.AlbumId == album.AlbumId);//该购物车id是否为我的购物车，该专辑是否在购物车中有了。（cards表里包含了所有人的购物车）
if (cartItem == null)
{
// Create a new cart item if no cart item exists
cartItem = new Cart
{
AlbumId = album.AlbumId,
CartId = ShoppingCartId,
Count = 1,
DateCreated = DateTime.Now
};
storeDB.Carts.Add(cartItem);
}
else
{
// If the item does exist in the cart, then add one to the quantity
//保存到数据库中
cartItem.Count++;
}
// Save changes
storeDB.SaveChanges();
}
public ActionResult Create([Bind(Include = "ArtistId,Name")] Artist artist)
{
if (ModelState.IsValid)
{
db.Artists.Add(artist);
db.SaveChanges();
return(RedirectToAction("Index"));
}
return(View(artist));
}
public ActionResult Create([Bind(Include = "GenreId,Name,Description")] Genre genre)
{
if (ModelState.IsValid)
{
db.Genres.Add(genre);
db.SaveChanges();
return(RedirectToAction("Index"));
}
return(View(genre));
}
public ActionResult Create([Bind(Include = "AlbumId,GenreId,ArtistId,Title,Price,AlbumArtUrl")] Album album)
{
if (ModelState.IsValid)//检查表单的数据是否通过了验证规则
{
//如果表单通过了验证，保存数据，然后显示更新之后的专辑列表，EF 将会生成适当的 SQL 命令来持久化对象
db.Albums.Add(album);
db.SaveChanges();
return(RedirectToAction("Index"));
}
//如果表单没有通过验证，重新显示带有验证提示信息的表单
ViewBag.ArtistId = new SelectList(db.Artists, "ArtistId", "Name", album.ArtistId);
ViewBag.GenreId = new SelectList(db.Genres, "GenreId", "Name", album.GenreId);
return(View(album));
}
