读操作：
using System;
using System.IO;
namespace ConsoleApplication2
{
/// <summary>
/// Summary description for Class2.
/// </summary>
public class Class1
{
private const string FILE_NAME="MyFile.txt";
public static void Main(String[] args)
{
if(!File.Exists(FILE_NAME)) //如果不文件存在,则抛出异常
{
Console.WriteLine("{0} does not exist!",FILE_NAME);
}
StreamReader sr=File.OpenText(FILE_NAME);
String input;
while((input=sr.ReadLine())!=null)
{
Console.WriteLine(input);
}
Console.WriteLine("The end of the Stream has been reched.");
sr.Close();
}
}
}
写操作：
using System;
using System.IO;
namespace ConsoleApplication2
{
/// <summary>
/// Summary description for Class2.
/// </summary>
public class Class1
{
private const string FILE_NAME="MyFile.txt";
public static void Main(String[] args)
{
StreamWriter sr;
string report;
if(File.Exists(FILE_NAME)) //如果文件存在,则创建File.AppendText对象
{
sr=File.AppendText(FILE_NAME);
report="appended";
}
else //如果文件不存在,则创建File.CreateText对象
{
sr=File.CreateText(FILE_NAME);
report="created";
}
sr.WriteLine("This is my first file.");
Console.WriteLine("{0} {1}",FILE_NAME,report);
sr.Close();
}
}
}