关于数组的练习分享和问题 - 黑马程序员技术交流社区

class Book
{
//图书的属性
public string strName;//书名
public double dblPrice;//价格
public string strAuthor;//作者 public Book(string _strName, double _dblPrice, string _strAuthor)
{
this.strName = _strName;
this.dblPrice = _dblPrice;
this.strAuthor = _strAuthor;
}

复制代码

class BookList
{
/// <summary>
/// 按照书名显示一个图书数组中的多本图书
/// </summary>
/// <param name="arrBooks">图书数组</param> public static void DisplayByName(Book[] arrBooks)
{
//获取图书数量，用于动态建立“书名”数组
int bookNumber = arrBooks.GetUpperBound(0) - arrBooks.GetLowerBound(0) + 1; //用CreateInstance方法动态建立“书名”数组
int[] lengths = new int[] { bookNumber };
int[] lowerBounds = new int[] { 0 };
Array arrNames=Array.CreateInstance(Type.GetType("System.String"),lengths,lowerBounds);
//为“书名”赋值
for (int i = arrBooks.GetLowerBound(0); i <= arrBooks.GetUpperBound(0); i++)
{
arrNames.SetValue(arrBooks[i].strName, i);
}
//对于arrBooks数组针对书名arrNames关键字进行排序
Array.Sort(arrNames, arrBooks);
//对排序完成后的arrBooks数组将各个元素显示和输出
foreach (Book item in arrBooks)
{
Console.WriteLine("{0} {1} {2}", item.strName, item.dblPrice, item.strAuthor);
}
}
/// <summary>
/// 按照图书价格显示多本图书
/// </summary>
/// <param name="arrBooks">图书数组</param>
public static void DisplayByPrice(Book[] arrBooks)
{
//获取图书数量，用于动态建立“价格”数组
int bookNumber = arrBooks.GetUpperBound(0) - arrBooks.GetLowerBound(0) + 1;
//用CreateInstance方法动态建立“价格”数组
int[] lengths = new int[] { bookNumber };
int[] lowerBounds = new int[] { 0 };
Array arrPrice = Array.CreateInstance(Type.GetType("System.Double"), lengths, lowerBounds);
//为“价格”赋值
for (int i = arrBooks.GetLowerBound(0); i <= arrBooks.GetUpperBound(0); i++)
{
arrPrice.SetValue(arrBooks[i].dblPrice, i);
}
//对于arrBooks数组针对价格arrPrice关键字进行排序
Array.Sort(arrPrice, arrBooks);
//对排序完成后的arrBooks数组将各个元素显示和输出
foreach (Book item in arrBooks)
{
Console.WriteLine("{0} {1} {2}", item.strName, item.dblPrice, item.strAuthor);
}
}
/// <summary>
/// 按照图书作者显示多本图书
/// </summary>
/// <param name="arrBooks">图书数组</param>
public static void DisplayByAuthor(Book[] arrBooks)
{
//获取图书数量，用于动态建立“作者”数组
int bookNumber = arrBooks.GetUpperBound(0) - arrBooks.GetLowerBound(0) + 1;
//用CreateInstance方法动态建立“作者”数组
int[] lengths = new int[] { bookNumber };
int[] lowerBounds = new int[] { 0 };
Array arrAuthor = Array.CreateInstance(Type.GetType("System.String"), lengths, lowerBounds);
//为“作者”赋值
for (int i = arrBooks.GetLowerBound(0); i <= arrBooks.GetUpperBound(0); i++)
{
arrAuthor.SetValue(arrBooks[i].strAuthor, i);
}
//对于arrBooks数组针对作者arrAuthor关键字进行排序
Array.Sort(arrAuthor, arrBooks);
//对排序完成后的arrBooks数组将各个元素显示和输出
foreach (Book item in arrBooks)
{
Console.WriteLine("{0}{1}{2}", item.strName, item.dblPrice, item.strAuthor);
}
}
}

复制代码

class Program
{
static void Main(string[] args)
{
Book b1 = new Book("我的1949", 20, "吴");
Book b2 = new Book("神经是怎么炼成的", 16.83, "张");
Book b3 = new Book("上下五千年", 299.99, "Alex");
Book b4 = new Book("达芬奇密码", 40.99, "丹布朗");
Book b5 = new Book("新编汉语词典", 30.5, "编委会"); Book[] myBook = new Book[] { b1, b2, b3, b4, b5 }; Console.WriteLine(">>请输入排序规则：1-按书名，2-按价格，3-按作者"); int choice = int.Parse(Console.ReadLine());
switch (choice)
{
case 1:
BookList.DisplayByName(myBook);
break;
case 2:
BookList.DisplayByPrice(myBook);
break;
case 3:
BookList.DisplayByAuthor(myBook);
break;
default:
break;
} Console.ReadKey(false);
}
}

复制代码