C# ProductContext.SaveChanges方法代码示例

 public bool AddProduct(string ProductName, string ProductDesc,
     string ProductPrice, string ProductCategory, string ProductImagePath)
 {
     var myProduct = new Product();
     myProduct.ProductName = ProductName;
     myProduct.Description = ProductDesc;
     myProduct.UnitPrice = Convert.ToDouble(ProductPrice);
     myProduct.ImagePath = ProductImagePath;
     myProduct.CategoryID = Convert.ToInt32(ProductCategory);
     using (ProductContext _db = new ProductContext())
     {
         _db.Products.Add(myProduct);
         _db.SaveChanges();
     }
     return true;
 }

        protected void RemoveProductButton_Click(object sender, EventArgs e)
        {
            using (var _db=new WingtipToys.Models.ProductContext())
            {
                int productId = Convert.ToInt16(DropDownRemoveProduct.SelectedValue);
                var myItem = (from c in _db.Products where c.ProductID == productId select c).FirstOrDefault();
                if (myItem != null)
                {
                    _db.Products.Remove(myItem);
                    _db.SaveChanges();

                    // Reload the page.
                    string pageUrl = Request.Url.AbsoluteUri.Substring(0, Request.Url.AbsoluteUri.Count() - Request.Url.Query.Count());
                    Response.Redirect(pageUrl + "?ProductAction=remove");
                }
                else
                    LabelRemoveStatus.Text = "Unable to locate product.";
            }
        }

        protected void Page_Load(object sender, EventArgs e)
        {
            if(!IsPostBack)
            {
                NVPAPICaller payPalCAller = new NVPAPICaller();

                string retMsg = "";
                string token = "";
                string PayerID = "";
                NVPCodec decoder = new NVPCodec();
                token = Session["token"].ToString();

                bool ret = payPalCAller.GetCheckoutDetails( token, ref PayerID, ref decoder, ref retMsg );
                if(ret)
                {
                    Session["payerId"] = PayerID;

                    var myOrder = new Order();
                    myOrder.OrderDate = Convert.ToDateTime(decoder["TIMESTAMP"].ToString());
                    myOrder.Uername = User.Identity.Name;
                    myOrder.FirstName = decoder["FIRSTNAME"].ToString();
                    myOrder.LastName = decoder["LASTNAME"].ToString();
                    myOrder.Address = decoder["SHIPTOSTREET"].ToString();
                    myOrder.City = decoder["SHIPTOCITY"].ToString();
                    myOrder.State = decoder["SHIPTOSTATE"].ToString();
                    myOrder.PostalCode = decoder["SHIPTOZIP"].ToString();
                    myOrder.Country = decoder["SHIPTOCOUNTRYCODE"].ToString();
                    myOrder.Email = decoder["EMAIL"].ToString();
                    myOrder.Total = Convert.ToDecimal( decoder["AMT"].ToString() );

                    //verify total payment amount as set on checkout start.aspx.
                    try
                    {
                        decimal paymentAmountOnCheckout = Convert.ToDecimal( Session["payment_amt"].ToString() );
                        decimal paymentAmountFromPayPal = Convert.ToDecimal( decoder["AMT"].ToString() );
                        if (paymentAmountOnCheckout != paymentAmountFromPayPal)
                        {
                            Response.Redirect( "CheckoutError.aspx?" + "Desc=Amount%20total%20mismatch." );
                        }
                    }
                    catch (Exception)
                    {
                        Response.Redirect("CheckoutError.aspx?" + "Desc=Amount%20total%20mismatch.");
                    }

                    //get db context
                    ProductContext _db = new ProductContext();

                    //add order to db
                    _db.Orders.Add(myOrder);
                    _db.SaveChanges();

                    //Get the shopping cart items and process them
                    using (WingtipToys.Logic.ShoppingCartActions usersShoppingCart = new WingtipToys.Logic.ShoppingCartActions())
                    {
                        List<CartItem> myOrderList = usersShoppingCart.GetCartItems();

                        //add oderdetail info to the db for each product purchased
                        for (int i= 0; i < myOrderList.Count; i++)
                        {
                            //create new order detail object
                            var myOrderDetail = new OrderDetail();
                            myOrderDetail.OrderId = myOrder.OrderId;
                            myOrderDetail.Username = User.Identity.Name;
                            myOrderDetail.ProductId = myOrderList[i] .ProductId;
                            myOrderDetail.Quantity = myOrderList[i] .Quantity;
                            myOrderDetail.UnitPrice = myOrderList[i] .Product.UnitPrice;

                            // add orderdetail to db
                            _db.OrderDetails.Add(myOrderDetail);
                            _db.SaveChanges();
                        }
                        // set order id
                        Session["currentOrderId"] = myOrder.OrderId;

                        //displayorder info
                        List<Order> orderList = new List<Order>();
                        orderList.Add(myOrder);
                        ShipInfo.DataSource = orderList;
                        ShipInfo.DataBind();

                        //display order detail
                        OrderItemList.DataSource = myOrderList;
                        OrderItemList.DataBind();
                    }
                }
                else
                {
                    Response.Redirect("CheckoutError.aspx?" + retMsg);
                }
            }
        }

 public void UpdateItem(string updateCartID, int updateProductID, int quantity)
 {
     using (var _db = new WingtipToys.Models.ProductContext())
     {
         try
         {
             var myItem = (from c in _db.ShoppingCartItems where c.CartId == updateCartID && c.Product.ProductID == updateProductID select c).FirstOrDefault();
             if (myItem != null)
             {
                 myItem.Quantity = quantity;
                 _db.SaveChanges();
             }
         }
         catch (Exception exp)
         {
             throw new Exception("ERROR: Unable to Update Cart Item - " + exp.Message.ToString(), exp);
         }
     }
 }

        public void RemoveItem(string removeCartID, int removeProductID)
        {
            using (var _db = new WingtipToys.Models.ProductContext())
            {
                try
                {
                    var myItem = (from c in _db.ShoppingCartItems where c.CartId == removeCartID && c.Product.ProductID == removeProductID select c).FirstOrDefault();

                    if (myItem != null)
                    {
                        // Remove Item
                        _db.ShoppingCartItems.Remove(myItem);
                        _db.SaveChanges();
                    }
                }

                catch (Exception exp)
                {
                    throw new Exception("ERROR: Unable to remove cart item - " + exp.Message.ToString(), exp);
                }
            }
        }

        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
              {
            // Verify user has completed the checkout process.
            if ((string)Session["userCheckoutCompleted"] != "true")
            {
              Session["userCheckoutCompleted"] = string.Empty;
              Response.Redirect("CheckoutError.aspx?" + "Desc=Unvalidated%20Checkout.");
            }

            NVPAPICaller payPalCaller = new NVPAPICaller();

            string retMsg = "";
            string token = "";
            string finalPaymentAmount = "";
            string PayerID = "";
            NVPCodec decoder = new NVPCodec();

            token = string.Empty; // Session["token"].ToString();
            PayerID = Session["payerId"].ToString();
            finalPaymentAmount = Session["payment_amt"].ToString();

            //bool ret = payPalCaller.DoCheckoutPayment(finalPaymentAmount, token, PayerID, ref decoder, ref retMsg);
            bool ret = true;
            if (ret)
            {
              // Retrieve PayPal confirmation value.

              ProductContext _db = new ProductContext();
              // Get the current order id.
              int currentOrderId = -1;
              if (Session["currentOrderId"] != string.Empty)
              {
            currentOrderId = Convert.ToInt32(Session["currentOrderID"]);
              }
              Order myCurrentOrder;
              if (currentOrderId >= 0)
              {
            // Get the order based on order id.
            myCurrentOrder = _db.Orders.Single(o => o.OrderId == currentOrderId);
            // Update the order to reflect payment has been completed.
            myCurrentOrder.PaymentTransactionId = string.Empty;
            // Save to DB.
            _db.SaveChanges();
              }

              // Clear shopping cart.
              using (WingtipToys.Logic.ShoppingCartActions usersShoppingCart =
              new WingtipToys.Logic.ShoppingCartActions())
              {
            usersShoppingCart.EmptyCart();
              }

              // Clear order id.
              Session["currentOrderId"] = string.Empty;
            }
            else
            {
              Response.Redirect("CheckoutError.aspx?" + retMsg);
            }
              }
        }

 public void UpdateItem(string CartID, int ProdID, int qty)
 {
     using (var db = new WingtipToys.Models.ProductContext())
     {
         try
         {
             var myItem = (from c in db.ShoppingCartItems where c.CartID == CartID && c.Product.ProductID == ProdID select c).FirstOrDefault();
             if (myItem != null)
             {
                 myItem.Quantity = qty;
                 db.SaveChanges();
             }
         }
         catch (Exception)
         {
             throw;
         }
     }
 }

 public void RemoveItem(string remvCartID, int remvProdID)
 {
     using (var db = new WingtipToys.Models.ProductContext())
     {
         try
         {
             var myItem = (from c in db.ShoppingCartItems where c.CartID == remvCartID && c.Product.ProductID == remvProdID select c).FirstOrDefault();
             if (myItem != null)
             {
                 db.ShoppingCartItems.Remove(myItem);
                 db.SaveChanges();
             }
         }
         catch (Exception)
         {
             throw;
         }
     }
 }

        protected void CheckoutConfirm_Click(object sender, EventArgs e)
        {
            Session["payerId"] = "";

            var myOrder = new Order();

            string AMT = Session["payment_amt"].ToString();

            myOrder.OrderDate = DateTime.Now;
            myOrder.Username = User.Identity.Name;
            myOrder.FirstName = TextBoxFN.Text;
            myOrder.LastName = TextBoxSN.Text;
            myOrder.Address = TextBoxAddress.Text;
            myOrder.City = TextBoxCity.Text;
            myOrder.State = TextBoxZone.Text;
            myOrder.PostalCode = TextBoxIndex.Text;
            myOrder.Country = TextBoxZone.Text;
            myOrder.Email = TextBoxMail.Text;

            myOrder.Phone = TextBoxPhone.Text;
            myOrder.PaymentTransactionId = "1";
            myOrder.OrderDetails = new List<OrderDetail>();
            myOrder.DSID = 1;

            myOrder.Total = Convert.ToDecimal(AMT);

            // Verify total payment amount as set on CheckoutStart.aspx.
            try
            {
                decimal paymentAmountOnCheckout = Convert.ToDecimal(Session["payment_amt"].ToString());
                decimal paymentAmoutFromPayPal = Convert.ToDecimal(AMT);
                if (paymentAmountOnCheckout != paymentAmoutFromPayPal)
                {
                    Response.Redirect("CheckoutError.aspx?" + "Desc=Amount%20total%20mismatch.");
                }
            }
            catch (Exception)
            {
                Response.Redirect("CheckoutError.aspx?" + "Desc=Amount%20total%20mismatch.");
            }

            // Get DB context.
            ProductContext _db = new ProductContext();

            // Add order to DB.
            _db.Orders.Add(myOrder);
            _db.SaveChanges();

            // Get the shopping cart items and process them.
            using (WingtipToys.Logic.ShoppingCartActions usersShoppingCart = new WingtipToys.Logic.ShoppingCartActions())
            {
                List<CartItem> myOrderList = usersShoppingCart.GetCartItems();

                // Add OrderDetail information to the DB for each product purchased.
                for (int i = 0; i < myOrderList.Count; i++)
                {
                    // Create a new OrderDetail object.
                    var myOrderDetail = new OrderDetail();
                    myOrderDetail.OrderId = myOrder.OrderId;
                    myOrderDetail.Username = User.Identity.Name;
                    myOrderDetail.ProductId = myOrderList[i].ProductId;
                    myOrderDetail.Quantity = myOrderList[i].Quantity;
                    myOrderDetail.UnitPrice = myOrderList[i].Product.UnitPrice;

                    // Add OrderDetail to DB.
                    //myOrder.OrderDetails.Add(myOrderDetail);
                    _db.OrderDetails.Add(myOrderDetail);
                    _db.SaveChanges();
                }

                // Set OrderId.
                Session["currentOrderId"] = myOrder.OrderId;

                // Display Order information.
                List<Order> orderList = new List<Order>();
                orderList.Add(myOrder);
            }

            //_db.Orders.Add(myOrder);
            //_db.SaveChanges();

            Response.Redirect("CheckoutReview.aspx");
        }