C#读写二进制文件

时间：2011-02-07 来源：与时俱进

  /// <summary>
  /// 读取信息方法
  /// </summary>
  /// <returns>读取是否成功</returns>
  public void ReadInfo(List<Student> stu)
  {
   Console.WriteLine("请输入文件读取路径:(键入回车为默认路径)");
   String filename = Console.ReadLine();
   FileStream fs;
   //默认路径
   if (filename == "")
   {
    fs = new FileStream("student.dll", FileMode.Open);
   }
   else
   {
    //如果文件不存在，就提示错误
    if (!File.Exists(filename))
    {
     Console.WriteLine("\n\t读取失败！\n错误原因：可能不存在此文件");
     return;
    }
    //否则创建文件
    fs = new FileStream(filename, FileMode.Open);
   }
   //使用二进制读取
   BinaryReader br = new BinaryReader(fs);
   Console.Write("读取信息将覆盖现有的信息，继续吗？y/n :");
   String command = Console.ReadLine();
   if (command == "y" || command == "Y")
   {
    for (int i = 0; i < stu.Count; i++)
    {
     stu.RemoveAt(i);
    }
    //从磁盘上读取信息
    try
    {
     while (true)
     {
      Student student = new Student();
      student.Id = br.ReadString();
      student.Name = br.ReadString();
      student.Score1 = br.ReadDouble();
      student.Score2 = br.ReadDouble();
      student.Score3 = br.ReadDouble();
      stu.Add(student);
      student = null;
     }
    }
    catch (Exception)
    {
     Console.WriteLine("\n\n读取结束！");
    }
   }
   br.Close();
   fs.Close();
  }

下面是我的写入方法，写入参数List<Student> stu中的数据

  /// <summary>
  /// 写入信息方法
  /// </summary>
  /// <returns>写入是否成功</returns>
  public void WriteInfo(List<Student> stu)
  {
   Console.WriteLine("请输入文件保存路径:(键入回车为默认路径)");
   FileStream fs;
   String filename = Console.ReadLine();
   //默认路径
   if (filename == "")
   {
    fs = new FileStream("student.dll", FileMode.Create);
   }
   //手动输入路径
   else
   {
    //如果文件存在，就提示错误
    if (File.Exists(filename))
    {
     Console.WriteLine("\n\t保存失败！\n错误原因：可能存在相同文件");
     return;
    }
    //否则创建文件
    fs = new FileStream(filename, FileMode.Create);
   }
   //数据保存到磁盘中
   BinaryWriter bw = new BinaryWriter(fs);
   foreach (Student student in stu)
   {
    bw.Write((String)student.Id);
    bw.Write((String)student.Name);
    bw.Write((Double)student.Score1);
    bw.Write((Double)student.Score2);
    bw.Write((Double)student.Score3);
    bw.Flush();
   }
   bw.Close();
   fs.Close();
   Console.WriteLine("保存成功!");
  }