S2 深入.NET和C#编程 机试测试错题积累

机试第一题：

                            

 //创建文件流（路径  模式）

               FileStream fa = new FileStream(@"D:\\S2第一次全文机试测试\\S2第一次全文机试测试" + textBox1.Text, FileMode.Create);

            //写入器

            StreamWriter sw = new StreamWriter(fa,Encoding.GetEncoding("GB2312"));

            //写入操作

            sw.Write("作者：\t" + textBox1.Text + "\t书名：\t" + textBox1.Text + "\t内容\t" + txtnei.Text);

            MessageBox.Show("写入成功");

            //关闭写入器

            sw.Close();

            //关闭文件流

            fa.Close();
           

五步走：

1： 创建文件流

2：创建阅读器或者是写入器

3：执行读写操作

4：关闭阅读器或者是写入器

5：关闭文件流

机试第二题：

抽象方法实现多态

public class Bird:Forest

    {

        //鸟

        public override void Play()

        {

            Console.WriteLine(  "鸟在天上飞!");

        }

    }

public  class dog:Forest

    {

       public override void Play()

       {

           Console.WriteLine("狗在地上跑!");

       }

    }

 public class Fish:Forest

    {

        public override void Play()

        {

            Console.WriteLine("鱼在水里游!");

        }

    }

 public abstract class Forest

    {

        //动物类

        public abstract void Play();

    }

main方法：

    static void Main(string[] args)

        {

            List<Forest> list = new List<Forest>();

            Forest a = new Fish();

            Forest b = new dog();

            Forest c = new Bird();

            list.Add(a);

            list.Add(b);

            list.Add(c);

            Console.WriteLine("森林里的小动物在快乐的生活！");

            Console.WriteLine();

            foreach (Forest item in list)

            {

                item.Play();

            }

            Console.ReadLine();

        }

    }

}

测试第三题：

解析xml绑定树状图treeview

 public class Address

    {

        //街道

        private string street;

        //居委会

        private string Jwh;

         //楼号

        private string floornum;

        public string Street

        {

            get { return street; }

            set { street = value; }

        }

        public string Jwh1

        {

            get { return Jwh; }

            set { Jwh = value; }

        }

        public string Floornum

        {

            get { return floornum; }

            set { floornum = value; }

        }

    }

public class RoomAddress

    {

        public RoomAddress()

        {

            address = new Address();

        }

        private string roomnum;

        private Address address;

        public string Roomnum

        {

            get { return roomnum; }

            set { roomnum = value; }

        }

        public Address Address

        {

            get { return address; }

            set { address = value; }

        }

    }

public class Common

    {

        //解析XML文件。并且将解析的XML文件加载到集合中

        public Dictionary<string, RoomAddress> list = new Dictionary<string, RoomAddress>();

        public void ReadDataFromXML()

        {

            XmlDocument doc = new XmlDocument();

            doc.Load("Address.xml");

            XmlNode root = doc.DocumentElement;

            foreach (XmlNode item in root.ChildNodes)

            {

                //创建一个地址对象

                //Address address = new Address();

                //address.Street = root.Attributes["name"].InnerText;

                //address.Jwh1 =item.Attributes["name"].InnerText;

                string street =root.Attributes["name"].InnerText;

                string jwh =item.Attributes["name"].InnerText;

                foreach (XmlNode child in item.ChildNodes)

                {

                   string floornum =child.Attributes["name"].InnerText;

                   foreach (XmlNode node in child.ChildNodes)

                   {

                       Address address = new Address();

                       address.Street = street;

                       address.Jwh1 = jwh;

                       address.Floornum = floornum;

                       RoomAddress roomAddress = new RoomAddress();

                       //RoomAddress类中才能反映出当前的具体位置信息

                       roomAddress.Roomnum = node.InnerText;

                       roomAddress.Address = address;

                       list.Add(address.Jwh1+address.Floornum+roomAddress.Roomnum,roomAddress);

                   }

                }

            }

        }

    }