//添加商品到购物车
protected void BtnAddToCard_Click(object sender, EventArgs e)
{
if (Session["UserId"] != null)
{
int bid = int.Parse(Request.QueryString["Book_Id"].ToString());
int uid = int.Parse(Session["UserId"].ToString());
int qty = int.Parse(txtPurchaseQty.Text);
//先判断购物车是否存在该商品，若不存在，则添加；存在，则提示已添加
if (qty > 0 && qty <= 10)
{
if (!cartService.IsCartItemExist(bid, uid))
{
var book = ProService.GetBookInfoByBookId(bid);
cartService.InsertIntoCartItem(uid, bid, book.BookName, decimal.Parse(book.ListPrice.ToString()), qty);
Response.Write("<script> alert('添加成功！')</script>");
Response.Write("<script>window.location.href='ProDetails.aspx?Book_Id=" + bid + "'</script>");
}
else
{
lblAddCartMsg.Text = "你已经添加过该商品了！";
}
}
else
{
lblAddCartMsg.Text = "购买数量必须大于0并且不能大于10！";
}
}
else
{
Response.Redirect("Login.aspx");
}
}