booksale.cs

是计算所买书籍的价钱

using System;

namespace BookMulti
{
	/// <summary>
	/// BookSale 的摘要说明。
	/// </summary>
	public class BookSale
	{
		string strTitle;
		int    intQuantity;
		decimal decPrice,decExtendedPrice;
		static  decimal decSalesTotal;
		static  int   intSalesCount;		
		public BookSale(string strTitle,int intQuantity,decimal decPrice)
		{
			this.Title=strTitle;
			this.Quantity=intQuantity;
			this.Price=decPrice;
			CaculateExtended();
			AddToTotals();
		}
		protected virtual void CaculateExtended()
		{
			decExtendedPrice=intQuantity*decPrice;
		}
		protected void AddToTotals()
		{
			decSalesTotal+=decExtendedPrice;
			intSalesCount++;
		}
		

		public static decimal SalesTotal
		{
			get
			{
				return decSalesTotal;
			}
		}

		public static int SalesCount
		{
			get
			{
				return intSalesCount;
			}
		}

		public string Title
		{
			get
			{
				return strTitle;
			}
			set
			{
				strTitle=value;
			}
		}

		public int Quantity
		{
			get
			{
				return intQuantity;
			}
			set
			{
				intQuantity=value;
			}
		}

		public decimal Price
		{
			get
			{
				return decPrice;
			}
			set
			{
				decPrice=value;
			}
		}

		public decimal ExtendedPrice
		{
			get
			{
				return decExtendedPrice;
			}
			set
			{
				decExtendedPrice=value;
			}
		}
				
	}
}