studentbooksale.cs

是计算所买书籍的价钱

using System;

namespace BookMulti
{
	/// <summary>
	/// StudentBookSale 的摘要说明。
	/// </summary>
	public class StudentBookSale:BookSale
	{
	    static decimal decDiscountTotal;
		const decimal  decDISCOUNT_RATE =0.15M;
		public StudentBookSale(string strTitle,int intQuantity,decimal decPrice):base(strTitle,intQuantity,decPrice)
		{
			//
			// TODO: 在此处添加构造函数逻辑
			//
		}
		protected override void CaculateExtended()
		{
			decimal decDiscount;
			decDiscount=Quantity*Price*decDISCOUNT_RATE;
			ExtendedPrice=Quantity*Price-decDiscount;
			decDiscountTotal+=decDiscount;

		}

		public static decimal DiscountTotal
		{
			get
			{
				return decDiscountTotal;
			}
		}

	}
}