（1）写一个方法根据图书名，查询某本图书是否存在
class Book { public string Name { get; set; } public string Author { get; set; } public float Price { get; set; } public int PageCount { get; set; } public Book() { } public Book(string name, string author, float price, int pageCount) { Name = name; Author = author; Price = price; PageCount = pageCount; } public static bool QuaryBookByBookName(string name,Book[] books) { for (int i = 0; i < books.Length; i++) { if (name==books[i].Name) { return true; } } return false; }main方法测试参考代码：
static void Task03() { Book[] books = new Book[5]; books[0] = new Book("水浒传","施耐庵",56,560); books[1] = new Book("C1#从入门到精通", "张三", 78, 1140); books[2] = new Book("浅谈C#的优与劣", "李四", 98, 540); books[3] = new Book("红楼梦", "曹雪芹", 42, 780); books[4] = new Book("C2#从入门到放弃", "王五", 2, 120); bool ret = Book.QuaryBookByBookName("C#从入门到精通",books); Console.WriteLine(ret); ret = Book.QuaryBookByBookName("C#", books); Console.WriteLine(ret); ret = Book.QuaryContainsName("C#",books); Console.WriteLine(ret); }（2）写一个方法找出所有包含“C#”字样的图书
public static bool QuaryContainsName(string name,Book[] books) { for (int i = 0; i < books.Length; i++) { //第一种方式 //if (books[i].Name.Contains(name)) //{ // return true; //} //第二种方式 if (IsConctains(books[i].Name,name)) { return true; } } return false; } //判断字符串targetStr中是否包含sourceStr，返回布尔值 static bool IsConctains(string targetStr,string sourceStr) { if (targetStr.Length<sourceStr.Length) { return false; } for (int i = 0; i < targetStr.Length-sourceStr.Length+1; i++) { for (int j = 0; j < sourceStr.Length; j++) { if (sourceStr[j] != targetStr[i+j]) { break; } if (j==sourceStr.Length-1) { return true; } } } return false; } }main方法测试参考代码：
static void Task03() { Book[] books = new Book[5]; books[0] = new Book("水浒传","施耐庵",56,560); books[1] = new Book("C1#从入门到精通", "张三", 78, 1140); books[2] = new Book("浅谈C#的优与劣", "李四", 98, 540); books[3] = new Book("红楼梦", "曹雪芹", 42, 780); books[4] = new Book("C2#从入门到放弃", "王五", 2, 120); bool ret = Book.QuaryContainsName("C#",books); Console.WriteLine(ret); }