基本类型数组

13．1数组的类型转换

13．2所有数组都隐式继承自System.Array

13．3所有数组都隐式实现IEnumerable，ICollection和Ilist

13．4数组的传递与返回

13．5创建下界非0的数组

public sealed class DynamicArrays {
        public static void Main() {
            //创建这样一个数组[20052009][14]
            Int32[] lowerBounds ={ 2005, 1 };//第二维大小
            Int32[] lengths ={ 5, 4 };//第一维大小
            Decimal[,] quarterlyRevenue = (Decimal[,])
              Array.CreateInstance(typeof(Decimal),lengths,lowerBounds);
            Console.WriteLine("{0,4}{1,9}{2,9}{3,9}{4,9}", "Year", "Q1", "Q2", "Q3", "Q4");
            Int32 firstyear = quarterlyRevenue.GetLowerBound(0);//2005
            Int32 lastyear = quarterlyRevenue.GetUpperBound(0);//2009
            Int32 firstQuarter = quarterlyRevenue.GetLowerBound(1);//1
            Int32 lastQuarter = quarterlyRevenue.GetUpperBound(1);//4
            for (Int32 y = firstyear; y <= lastyear; y++)
            {
                Console.WriteLine(y + " ");
                for (Int32 q = firstQuarter; q <= lastQuarter; q++)
                    Console.Write("{0,9:C}", quarterlyRevenue[y, q]);
                Console.WriteLine();
            }
            Console.ReadLine();

        }
    }

13．6数组访问性能