shoppingcartmanager.cs

一个很好的网上购物系统！进行了新的修改具有很多的功能！

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Text;
using System.IO;
using Commerce.Providers;

/// <summary>
/// The controller for the shopping cart
/// </summary>
public class ShoppingCartManager {

    /// <summary>
    /// Returns the users name or a GUID, depending if they are logged in.
    /// </summary>
    /// <returns></returns>
    static string GetUserName() {

        string sUserName = "";
        if (HttpContext.Current.User.Identity.IsAuthenticated) {
            sUserName = HttpContext.Current.User.Identity.Name;
        } else {

            //we'll tag them with an anon userName until they register
            if (HttpContext.Current.Request.Cookies["shopperID"] != null) {
                sUserName = HttpContext.Current.Request.Cookies["shopperID"].Value;
            } else {

                //if we have never seen them, tag them with a cookie so we can track 
                //their basket.
                sUserName = System.Guid.NewGuid().ToString();
                HttpContext.Current.Response.Cookies["shopperID"].Value = sUserName;
                HttpContext.Current.Response.Cookies["shopperID"].Expires = DateTime.Today.AddDays(365);
            }
        }
        return sUserName;
    }

    /// <summary>
    /// Adds an item to the cart
    /// </summary>
    /// <param name="productID"></param>
    /// <param name="itemName"></param>
    /// <param name="itemNumber"></param>
    /// <param name="price"></param>
    /// <param name="quantity"></param>
    public static void AddItem(int productID, int quantity, string modelName, 
        string modelNumber, string description, double price, string sku,double weight) {

        string userName = GetUserName();
        bool productIsActive = CatalogManager.IsActive(productID);
        if (!productIsActive) {
            throw new Exception("This product is no longer active");
        } else {
            ShoppingCartProvider.Instance.CartAddItem(userName, productID, quantity, modelName, modelNumber, description, price, sku,weight);
        }
    }
    
    /// <summary>
    /// Removes an item from the cart
    /// </summary>
    /// <param name="ItemNumber"></param>
    public static void RemoveItem(int productID) {
        
        ShoppingCartProvider.Instance.CartAdjustQuantity(GetUserName(), productID, 0);
    }
    
    /// <summary>
    /// Adjusts the quantity of an item in the cart to the new quantity
    /// </summary>
    /// <param name="ItemNumber"></param>
    /// <param name="newQuantity"></param>
    public static void AdjustQuantity(int productID, int newQuantity) {

        ShoppingCartProvider.Instance.CartAdjustQuantity(GetUserName(), productID, newQuantity);
    }


    /// <summary>
    /// Loads a simple cart object and it's items
    /// </summary>
    /// <returns></returns>
    public static ShoppingCart GetCart() {
        IDataReader rdr = ShoppingCartProvider.Instance.CartGetCurrentCart(GetUserName());
        ShoppingCart cart = new ShoppingCart();
        cart.Load(rdr);

        //the items are the next bits
        if (rdr.NextResult()) {
            cart.Items = new ShoppingCartItems();
            DataRow dr;
            int counter = 0;
            while(rdr.Read()) {
                dr = cart.Items.NewRow();
                dr["productID"] = (int)rdr["productID"];
                dr["ModelName"] = rdr["ModelName"].ToString();
                dr["ModelNumber"] = rdr["ModelNumber"].ToString();
                dr["Price"] = Convert.ToDouble(rdr["price"].ToString());
                dr["LineTotal"] = Convert.ToDouble(rdr["lineTotal"].ToString());
                dr["Quantity"] = (int)rdr["quantity"];
                cart.Items.Rows.Add(dr);
            }
        }

        rdr.Close();
        return cart;
    }

    public static IDataReader GetCartItems() {
        return ShoppingCartProvider.Instance.CartGetCartItems(GetUserName());
    }

    /// <summary>
    /// Transfers a cart from one user to another. This is used mainly with anonymous shopping,
    /// where an anonymous user logs in and doesn't want to lose their cart.
    /// </summary>
    /// <param name="fromUserName"></param>
    /// <param name="toUserName"></param>
    public static void Transfer(string fromUserName, string toUserName){
        ShoppingCartProvider.Instance.CartTransfer(fromUserName,toUserName);
    }

    public static void UpdateCartPrices(int productID, double newPrice) {
        ShoppingCartProvider.Instance.UpdatePrices(productID, newPrice);
    }
    public static void RemoveAllProducts(int productID) {
        ShoppingCartProvider.Instance.RemoveProducts(productID);
    }
    public static void UpdateCartProducts(int productID,double newPrice,double newWeight,string newName,string newNumber,string newSKU) {
        ShoppingCartProvider.Instance.UpdateProducts(productID, newPrice, newWeight, newName, newNumber, newSKU);
    }
}