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);
                   }
                }

            }
        }
    }