C#读写txt文件的2种方法

byte[] byData = new byte[100];
    char[] charData = new char[1000];
    public void Read()
    {
      try
      {
        FileStream file = new FileStream("E:\test.txt", FileMode.Open);
        file.Seek(0, SeekOrigin.Begin);
        file.Read(byData, 0, 100); 
        //byData传进来的字节数组,用以接受FileStream对象中的数据,第2个参数是字节数组中开始写入数据的位置,它通常是0,表示从数组的开端文件中向数组写数据,最后一个参数规定从文件读多少字符.
        Decoder d = Encoding.Default.GetDecoder();
        d.GetChars(byData, 0, byData.Length, charData, 0);
        Console.WriteLine(charData);
        file.Close();
      }
      catch (IOException e)
      {
        Console.WriteLine(e.ToString());
      }
    }

public void Read(string path)
    {
      StreamReader sr = new StreamReader(path,Encoding.Default);
      String line;
      while ((line = sr.ReadLine()) != null) 
      {
        Console.WriteLine(line.ToString());
      }
    }

public void Write()
    {
      FileStream fs = new FileStream("E:\ak.txt", FileMode.Create);
      //获得字节数组
      byte[] data = System.Text.Encoding.Default.GetBytes("Hello World!"); 
      //开始写入
      fs.Write(data, 0, data.Length);
      //清空缓冲区、关闭流
      fs.Flush();
      fs.Close();
    }

public void Write(string path)
    {
      FileStream fs = new FileStream(path, FileMode.Create);
      StreamWriter sw = new StreamWriter(fs);
      //开始写入
      sw.Write("Hello World!!!!");
      //清空缓冲区
      sw.Flush();
      //关闭流
      sw.Close();
      fs.Close();
    }