读写文件

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

namespace StreamWrite
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                FileStream aFile = newFileStream("Log.txt", FileMode.OpenOrCreate);
                StreamWriter sw = newStreamWriter(aFile);

                bool truth = true;
                // Write data to file.
                sw.WriteLine("Helloto you.");
                sw.WriteLine("It isnow {0} and things are looking good.",
                   DateTime.Now.ToLongDateString());
                sw.Write("More thanthat,");
                sw.Write(" it's {0}that C# is fun.", truth);
                sw.Close();
            }
            catch (IOException ex)
            {
               Console.WriteLine("An IOException has been thrown!");
               Console.WriteLine(ex.ToString());
                Console.ReadLine();
                return;
            }
        }
    }
}

读取文件，这里介绍StreamReader对象
static void Main(string[] args)
{
     string strLine;
     try
     {
            FileStream aFile = newFileStream("Log.txt",FileMode.Open);
            StreamReader sr = newStreamReader(aFile);
            strLine = sr.ReadLine();
            //Read data in line by line 这个兄台看的懂吧~一行一行的读取
      while(strLine != null)
            {
               Console.WriteLine(strLine);
                Line = sr.ReadLine();
             }
            sr.Close();
       }catch (IOException ex)
            {
                Console.WriteLine("An IOException hasbeen thrown!");
               Console.WriteLine(ex.ToString());
                Console.ReadLine();
                return;
            }
}