C#编程-117：文件流FileStream类

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
namespace FileStreamReadTest
{
class Program
{
static void Main(string[] args)
{
string path = @"C:\Users\pengshiyu\Desktop\source\test.txt";
byte[] bufferByte=new byte[100];
char[] bufferChar=new char[100];
try
{
FileStream fs = new FileStream(path,FileMode.OpenOrCreate,FileAccess.ReadWrite);
fs.Seek(0,SeekOrigin.Begin);
fs.Read(bufferByte,0,100);
Decoder dc = Encoding.Default.GetDecoder();
dc.GetChars(bufferByte,0,bufferChar.Length,bufferChar,0);
Console.WriteLine(bufferChar);
Console.WriteLine("读取完成！");
bufferChar = "这短话是新的，试试能不能写进去".ToCharArray();
Encoder en = Encoding.Default.GetEncoder();
en.GetBytes(bufferChar,0,bufferChar.Length,bufferByte,0,true);
fs.Seek(0,SeekOrigin.Begin);
fs.Write(bufferByte,0,bufferByte.Length);
fs.Close();
Console.WriteLine("写入完成！");
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
Console.ReadKey();
}
}
}