C#按二进制模式读写文件

扩展阅读 http://www.57itsq.com/read.php?tid-935.html

 

System.IO 还为我们提供了BinaryReader 和BinaryWriter 类用于按二进制模式读
写文件它们提供的一些读写方法是对称的比如针对不同的数据结构BinaryReader
提供了ReadByte ReadBoolean ReadInt ReadInt16 ReadDouble ReadString 等方法
而BinaryWriterz 则提供了WriteByte WriteBoolean WriteInt WriteInt16 WriteDouble
WriteString 方法
下面我们举一个通讯录的例子来说明BinaryReader 和BinaryWriter 类是如何使用
的。

using System;

using System.IO;

struct Record{

public string name;

public UInt16 age;

public string phone;

public string address;

}; //通讯录的记录格式

class PhoneBook

{

FileStream f_srm;

string s_filename;

Record m_record;

public PhoneBook(string filename)

{

s_filename = filename;

}

public int Open()

{ //显示初始化界面

Console.WriteLine("1: List Record");

Console.WriteLine("2: Add New Record");

Console.WriteLine("3: Erase Record");

Console.WriteLine("0: Exit");

int i = Console.Read() - '0';

return i;

}

public void AddNew()

{ //向通讯录中添加记录

    try{

    f_srm = new FileStream(s_filename,FileMode.OpenOrCreate);

    }

    catch

    {

    Console.WriteLine("PhoneBookError!");

    return;

    }

    BinaryWriter pw = new BinaryWriter(f_srm);

    pw.Seek(0,SeekOrigin.End);

    string s_temp;

    Console.Write("Name:");

    Console.ReadLine();

    m_record.name = Console.ReadLine();

    pw.WriteString(m_record.name);

    reenter:

    Console.Write("Age: ");

    s_temp = Console.ReadLine();

    try{

    m_record.age = s_temp.ToUInt16();

    }

    catch

    {

    Console.WriteLine("The formatof age is error,please ReEnter");

    goto reenter;

    }

    pw.Write(m_record.age);

    Console.Write("PhoneNumber: ");

    m_record.phone = Console.ReadLine();

    pw.WriteString(m_record.phone);

    Console.Write("Address:");

    m_record.address = Console.ReadLine();

    pw.WriteString(m_record.address);

    f_srm.Close();

    }

    public void List()

    { //浏览所有记录

    try{

       f_srm = new FileStream(s_filename,FileMode.Open);

    }

    catch

    {

    Console.WriteLine("PhoneBookError!");

    return;

。。。。。