文件读写操作-蒲公英云

Code
using System;
using System.IO;
/*从文本文件中读或者写文本时，首先需创建一个与文件相关的StreamReader或者StreamWriter对象
每一个StreamReader或StreamWriter对象都与一种字符编码方式相关。默认UTF8Encoding
*/
class FileOperate
{
publicstaticstring content=””;
publicstatic StreamReader sr=null;
publicstatic StreamWriter sw=null;
//读取文本时，有许多方法可以创建与文件名相关的Streamreader对象
///

///方法一：从文件名直接创建
///

publicvoid ReadFromFileName()
{

try
{
sr=new StreamReader (“TestFile.txt”);
string txt=””;
while((txt=sr.ReadLine())!=null)
{
content+=txt;
}
Console.WriteLine (“-—-ReadFromFileName———“);
Console.WriteLine (content);
}
catch(Exception ex)
{
Console.WriteLine (ex.Message);
}
finally
{
sr.Close ();
}

}
///

///方法二：使用File类或者FileInfo类的OpenText方法创建
///

publicvoid ReadUseFileOrFileInfo()
{

try
{
FileInfo fi=new FileInfo (“TestFile.txt”);
sr=fi.OpenText();
content=””;
while(!sr.EndOfStream)
{
content+=sr.ReadLine();
}
Console.WriteLine (“-—-ReadUseFileOrFileInfo———“);
Console.WriteLine (content);
}
catch(Exception ex)
{
Console.WriteLine (ex.Message);
}
finally
{
sr.Close ();
}

}

///

/// 方法3：通过FileStream对象创建
///

publicvoid ReadThroughFileStream()
{
//打开文件只读
FileStream fs1=new FileStream(“TestFile.txt”,FileMode.Open,FileAccess.Read );
//打开文件读写
//FileStream fs2=File.Open (“TestFile.txt”,FileMode.Open ,FileAccess.ReadWrite);
//打开文件读写
//FileStream fs3=File.Create(“TestFile.txt”);
//打开文件只读
//FileStream fs4=File.OpenRead(“TestFile.txt”);

try
{
sr=new StreamReader (fs1);
content=””;
while(!sr.EndOfStream)
{
content+=sr.ReadLine();
}
Console.WriteLine (“-—-ReadThroughFileStream———“);
Console.WriteLine (content);
}
catch(Exception ex)
{
Console.WriteLine (ex.Message);
}
finally
{
fs1.Close ();
sr.Close ();
}
}
//写入文件三种方式
///

/// 方法一：通过文件名创建
///

publicvoid WriteFromFileName()
{
try
{
sw=new StreamWriter(“TestFile.txt”);
Console.WriteLine (“Input Write File’s Content:”);
string lines=Console.ReadLine ();
sw.WriteLine(lines);
}
catch(Exception ex)
{
Console.WriteLine (ex.Message );
}
finally
{
sw.Close ();
}
}
///

/// 文件写入方法二：使用File类或者FileInfo类的CreateText或AppendText方法来创建
/// AppendText方法：对于文件内容进行追加 CreateText方法：会删除已经存在的文件
/// 缺点：只能创建支持UTF8Encoding的StreamWriter对象
///

publicvoid WriteUseFileOrFileInfo()
{
//File类的CreateText方法
StreamWriter sw1=File.CreateText(“TestFile.txt”);
sw1.WriteLine(“File类的CreateText方法”);
sw1.Close ();
//FileInfo CreateText
FileInfo fi1=new FileInfo (“TestFile.txt”);
StreamWriter sw2=fi1.CreateText();
sw2.WriteLine(“FileInfo CreateText “);
sw2.Close ();
//File类的AppendText方法
StreamWriter sw3=File.AppendText(“TestFile.txt”);
sw3.WriteLine(“File类的AppendText方法”);
sw3.Close ();
//FileInfo 的AppendText
FileInfo fi2=new FileInfo (“TestFile.txt”);
StreamWriter sw4=fi2.AppendText();
sw4.WriteLine(“FileInfo 的AppendText”);
sw4.Close ();
}
///

/// 通过FileStream对象来创建
///

publicvoid WriteThroughFileStream()
{

//打开文件只写
FileStream fs1=new FileStream(“TestFile.txt”,FileMode.Open,FileAccess.Write);
StreamWriter sw1=new StreamWriter(fs1);
sw1.WriteLine(“通过FileStream对象来创建”);
sw1.Close ();
fs1.Close ();
//打开文件读写
FileStream fs2=File.Open (“TestFile.txt”,FileMode.Open ,FileAccess.ReadWrite);
StreamWriter sw2=new StreamWriter(fs2);
sw2.WriteLine(“通过File.Open创建FileStream对象”);
sw2.Close ();
fs2.Close ();
//打开文件读写
FileStream fs3=File.Create(“TestFile.txt”);
StreamWriter sw3=new StreamWriter(fs3);
sw3.WriteLine(“通过File.Create创建FileStream对象”);
sw3.Close ();
fs3.Close ();
//打开文件只写
FileStream fs4=File.OpenWrite(“TestFile.txt”);
StreamWriter sw4=new StreamWriter(fs4);
sw4.WriteLine(“通过File.OpenWrite创建FileStream对象”);
sw4.Close ();
fs4.Close ();
}

///

/// 二进制文件读写
///

publicvoid ByteReadWrite()
{
FileStream fs =new FileStream(“TestFile.txt”, FileMode.OpenOrCreate, FileAccess.ReadWrite);//创建文件
StreamWriter sw =new StreamWriter(fs);
// 以文本方式写一个文件
sw.WriteLine(“Hello, World”);
sw.WriteLine(“你好吗?”);
sw.WriteLine(“我很好!”);
sw.WriteLine(“嘿嘿，示例好傻!”);
sw.Flush(); //清理缓冲区
StreamReader sr =new StreamReader(fs);
sr.BaseStream.Seek(0, SeekOrigin.Begin);//定位到流的开始位置
string str=string.Empty;
while (!sr.EndOfStream) //未到文件流结尾
{
str+= sr.ReadLine();
}
BinaryReader br =new BinaryReader(fs);
br.BaseStream.Seek(0, SeekOrigin.Begin);//定位到流的开始位置
Byte b =new Byte();
while (br.PeekChar() >-1)//定位到下一个字符
{
b += br.ReadByte();
}
//关闭文件流
sw.Close();
br.Close();
sr.Close();
fs.Close();

}

publicstaticvoid Main(string[] args)
{
FileOperate ofile=new FileOperate();
//读取文件写入文件
ofile.WriteFromFileName();
ofile.ReadFromFileName();
ofile.WriteUseFileOrFileInfo();
ofile.ReadUseFileOrFileInfo();
ofile.WriteThroughFileStream();
ofile.ReadThroughFileStream();
ofile.ByteReadWrite();
Console.ReadLine();
}

}

转载于//www.cnblogs.com/hubcarl/archive/2009/07/13/1522541.html