C#.net 用 StreamReader 和 StreamWriter 读写文件

using System;
using System.IO;
using System.Text;

namespace FileTest
{
class FileTest
{
static void Main(string[] args)
{
StreamReader myStreamReader;
StreamWriter myStreamWriter;
string sourceFileName = "F://source.txt"; //要读取的文件
string targetFileName = "F://target.txt"; //要写入的文件

try
{
File.Exists(sourceFileName); //源文件是否存在
}
catch(Exception e)
{
Console.WriteLine("Source File not existes ! {0}", e);
Console.ReadLine();
return;
}

try
{
myStreamReader = File.OpenText(sourceFileName); //打开源文件
}
catch(Exception e)
{
Console.WriteLine("File open failed : {0}", e);
Console.ReadLine();
return;
}

myStreamWriter = new StreamWriter(targetFileName, true); //实例化指向目标文件
while(myStreamReader.Peek() != -1)
{
string myStr = myStreamReader.ReadLine(); //读去源文件
myStreamWriter.WriteLine(myStr); //写入目标文件
}

myStreamReader.Close();
myStreamWriter.Close();

Console.WriteLine("Succesfully !");
Console.ReadLine();
}
}
}