PetShop3.0 BLL部分源代码

Account.cs

using System;

//References to PetShop specific libraries
//PetShop busines entity library
using PetShop.Model;

//PetShop DAL interfaces
using PetShop.IDAL;

namespace PetShop.BLL {

 /// <summary>
 /// A business Component used to manage accounts
 /// The PetShop.Model.Account is used in most methods
 /// and is used to store serializable information about an account
 /// </summary>
 public class Account {
  
  /// <summary>
  /// Method to login into the system. The user must supply a username and password
  /// </summary>
  /// <param name="userId">Unique identifier for a user</param>
  /// <param name="password">Password for a user</param>
  /// <returns>If the login is successful it returns information abount the account</returns>
  public AccountInfo SignIn(string userId, string password) {

   // Validate input
   if ((userId.Trim() == string.Empty) || (password.Trim() == string.Empty))
    return null;

   // Get an instance of the account DAL using the DALFactory
   IAccount dal = PetShop.DALFactory.Account.Create();

   // Try to sign in with the given credentials
   AccountInfo account = dal.SignIn(userId, password);

   // Return the account
   return account;
  }

  /// <summary>
  /// Returns the address information for a specific user
  /// </summary>
  /// <param name="userId">Unique identifier for an account/customer</param>
  /// <returns>Returns the address information for the user</returns>
  public AddressInfo GetAddress(string userId) {

   // Validate input
   if (userId.Trim() == string.Empty)
    return null;
   
   // Get an instance of the account DAL using the DALFactory
   IAccount dal = PetShop.DALFactory.Account.Create();

   // Return the address information for the given userId from the DAL
   return dal.GetAddress(userId);
  }

  /// <summary>
  /// A method to insert a new Account
  /// </summary>
  /// <param name="account">An account entity with information about the new account</param>
  public void Insert(AccountInfo account) {

   // Validate input
   if (account.UserId.Trim() == string.Empty)
    return;

   // Get an instance of the account DAL using the DALFactory
   IAccount dal = PetShop.DALFactory.Account.Create();

   // Call the DAL to insert the account
   dal.Insert(account);
  }

  /// <summary>
  /// A method to update an existing account
  /// </summary>
  /// <param name="account">An account entity with information about the account to be updated</param>
  public void Update(AccountInfo account) {

   // Validate input
   if (account.UserId.Trim() == string.Empty)
    return;

   // Get an instance of the account DAL using the DALFactory
   IAccount dal = PetShop.DALFactory.Account.Create();

   // Send the udpated account information to the DAL
   dal.Update(account);
  }
 }
}

Cart.cs

using System;
using System.Collections;

//References to PetShop specific libraries
//PetShop busines entity library
using PetShop.Model;

namespace PetShop.BLL {
 
 /// <summary>
 /// An object to represent a customer's shopping cart
 /// </summary>
 [Serializable]
 public class Cart : IEnumerable {

  /// <summary>
  /// Internal storage for a cart
  /// </summary>
  private ArrayList _items = new ArrayList();

  private decimal _total=0;

  /// <summary>
  /// Returns an enumerator for the cart items in a cart
  /// </summary>
  /// <returns></returns>
  public IEnumerator GetEnumerator() {
   return _items.GetEnumerator();
  }

  // Properties
  public decimal Total {
   get { return _total; }
   set { _total = value; }
  }

  /// <summary>
  /// Returns number of items in cart
  /// </summary>
  public int Count {
   get { return _items.Count; }
  }

  /// <summary>
  /// Return CartItem representation of object at a given address
  /// </summary>
  public CartItemInfo this[int index] {
   get { return (CartItemInfo)_items[index]; }
  }

  /// <summary>
  /// Add an item to the cart
  /// </summary>
  /// <param name="ItemId">ItemId of item to add</param>
  public void Add(string ItemId) {
   foreach (CartItemInfo cartItem in _items) {
    if (ItemId == cartItem.ItemId) {
     cartItem.Quantity++;
     cartItem.InStock = (GetInStock(ItemId) - cartItem.Quantity) >= 0 ? true : false;
     _total = _total+(cartItem.Price*cartItem.Quantity);
     return;
    }
   }

   Item item = new Item();

   ItemInfo data = item.GetItem(ItemId);
   CartItemInfo newItem = new CartItemInfo(ItemId,data.Name, (data.Quantity >= 1), 1, (decimal)data.Price);
   _items.Add(newItem);
   _total = _total+(data.Price);
  }

  /// <summary>
  /// Remove item from the cart based on itemId
  /// </summary>
  /// <param name="itemId">ItemId of item to remove</param>
  public void Remove(string itemId) {
   foreach (CartItemInfo item in _items) {
    if (itemId == item.ItemId) {
     _items.Remove(item);
     _total = _total-(item.Price*item.Quantity);
     return;
    }
   }
  }

  /// <summary>
  /// Removes item from cart at specific index
  /// </summary>
  /// <param name="index">Element number of item to remove</param>
  public void RemoveAt(int index) {
   CartItemInfo item = (CartItemInfo)_items[index];
   _total = _total-(item.Price*item.Quantity);
   _items.RemoveAt(index);
   
  }

  /// <summary>
  /// Returs internal array list of cart items
  /// </summary>
  /// <returns></returns>
  public ArrayList GetCartItems() {
   return _items;
  }

  /// <summary>
  /// Method to convert internal array of cart items to order line items
  /// </summary>
  /// <returns>New array list of order line items</returns>
  public ArrayList GetOrderLineItems() {

   ArrayList orderLineItems = new ArrayList();

   int lineNum = 1;

   foreach (CartItemInfo item in _items) {

    LineItemInfo lineItem = new LineItemInfo(item.ItemId, item.Name, lineNum, item.Quantity, item.Price);
    orderLineItems.Add(lineItem);
    lineNum++;
   }

   return orderLineItems;
  }

  
  /// <summary>
  /// Internal method to get the stock level of an item
  /// </summary>
  /// <param name="ItemId">Unique identifier of item to get stock level of</param>
  /// <returns></returns>
  private int GetInStock(string ItemId){
   Inventory inventory = new Inventory();

   return inventory.CurrentQuantityInStock(ItemId);
  }
 }
}