st_cart.cs

it have big power,i hope to do it . happy everyday!

using System;
using System.Collections;
using System.Data;

namespace STGROUP.ST_BookBiz
{
	/// <summary>
	/// ST_Cart 的摘要说明。
	/// </summary>
	public class ST_Cart
	{
		public ST_Cart()
		{
			//
			// TODO: 在此处添加构造函数逻辑
			//
		}
		private int _index;				// 该购物项在购物车中的编号
		private ArrayList alItemList = new ArrayList();


		public int Index
		{
			get{return _index;}
			set{_index = value;}
		}
		

		public float Total
		{
			get 
			{ 
				float total = 0.00F;

				if (alItemList.Count == 0)
					return total;

				foreach (ST_OrderProduct op in alItemList)
					total += op.Total;
            
				return total;
			}
		}

		public int Count
		{
			get{return alItemList.Count;}
		}

		public ICollection GetProducts()
		{
			return alItemList;
		}

		/// <summary>
		/// 取得商品信息
		/// </summary>
		/// <param name="productID"></param>
		/// <returns></returns>
		public ST_OrderProduct GetProduct(long productID)
		{
			foreach (ST_OrderProduct op in alItemList)
			{
				if (op.ST_ProductID == productID)
				{
					return op;
				}
			}
			return null;
		}

		/// <summary>
		/// 添加商品至购物车
		/// </summary>
		/// <param name="value"></param>
		/// <returns></returns>
		public bool Add(ST_OrderProduct value)
		{
			bool result = true;
			foreach (ST_OrderProduct op in alItemList)
			{
				if (op.ST_ProductID == value.ST_ProductID)
				{
					op.ST_Quantity += value.ST_Quantity;
					return result;
				}
			}
			alItemList.Add(value);
			return result;
		}

		public void Remove(long productID)
		{
			foreach (ST_OrderProduct op in alItemList)
			{
				if (op.ST_ProductID == productID)
				{	
					alItemList.Remove(op);
					break;
				}
			}
		}

		// 更新商品数量，qty必须大于0，为0的情况（即删除商品的情况）在Remove函数处理
		public void UpdateQty(long productID,int qty)
		{
			foreach (ST_OrderProduct op in alItemList)
			{
				if (op.ST_ProductID == productID)
				{
					op.ST_Quantity = qty;
					return;
				}
			}
		}

		/// <summary>
		/// 获得购物车中所有的商品
		/// 将部分产品信息重新组合为一个数据表
		/// </summary>
		/// <returns></returns>
		public DataTable GetProductItems()
		{
			DataTable table = new DataTable();
			table.Columns.Add("itemIndex");
			table.Columns.Add("ST_ProductId");
			table.Columns.Add("ST_ProductName");
			table.Columns.Add("ST_Price");
			table.Columns.Add("ST_SoldPrice");
			table.Columns.Add("ST_Quantity");
			table.Columns.Add("ST_Total");

			foreach(object obj1 in this.GetProducts())
			{
				ST_OrderProduct product = (ST_OrderProduct)obj1;
				DataRow row = table.NewRow();
				row["itemIndex"] = this.Index;
				row["ST_ProductId"] = product.ST_ProductID;
				row["ST_ProductName"] = product.ST_ProductName;
				row["ST_Price"] = product.ST_Price;
				row["ST_SoldPrice"] = product.ST_SoldPrice;
				row["ST_Quantity"] = product.ST_Quantity;
				row["ST_Total"] = product.Total;
				table.Rows.Add(row);
			}
			return table;
		}

		/// <summary>
		/// 构建订单详情的xml
		/// </summary>
		/// <returns></returns>
		public string BuildXml()
		{
			string strLine = "";
			System.Text.StringBuilder sb = new System.Text.StringBuilder();
			foreach(ST_OrderProduct op in alItemList)
			{
				strLine = "<OrderItem ProductID='" + op.ST_ProductID.ToString() + 
					"' Quantity='" + op.ST_Quantity.ToString() + 
					"' PaySum='" + op.ST_Quantity*op.ST_SoldPrice + 
					"' Price='" + op.ST_Price.ToString() + 
					"' SoldPrice='" + op.ST_SoldPrice.ToString() + 
					"  />"; 
				sb.Append(strLine);
	
			}
			return sb.ToString();
		}
	}
}