C#轻松实现对文件的操作

//C#写入/读出文本文件 
string fileName =@"c:I.txt"; 
StreamReader sr = new StreamReader(fileName); string str=sr.ReadLine (); sr.close(); 
StreamWriterrw=File.CreateText(Server.MapPath(".")+"\myText.txt"); 
rw.WriteLine("写入"); 
rw.WriteLine("abc"); 
rw.WriteLine(".NET笔记"); 
rw.Flush(); 
rw.Close(); 
//打开文本文件 
StreamReadersr=File.OpenText(Server.MapPath(".")+"\myText.txt"); 
StringBuilderoutput=newStringBuilder(); 
stringrl; 
while((rl=sr.ReadLine())!=null) 
...{ 
output.Append(rl+""); 
} 
lblFile.Text=output.ToString(); 
sr.Close(); 
//C#追加文件 
StreamWritersw=File.AppendText(Server.MapPath(".")+"\myText.txt"); 
sw.WriteLine("追逐理想"); 
sw.WriteLine("kzlll"); 
sw.WriteLine(".NET笔记"); 
sw.Flush(); 
sw.Close(); 
//C#拷贝文件 
stringOrignFile,NewFile; 
OrignFile=Server.MapPath(".")+"\myText.txt"; 
NewFile=Server.MapPath(".")+"\myTextCopy.txt"; 
File.Copy(OrignFile,NewFile,true); 
//C#删除文件 
stringdelFile=Server.MapPath(".")+"\myTextCopy.txt"; 
File.Delete(delFile); 
//C#移动文件 
stringOrignFile,NewFile; 
OrignFile=Server.MapPath(".")+"\myText.txt"; 
NewFile=Server.MapPath(".")+"\myTextCopy.txt"; 
File.Move(OrignFile,NewFile); 
//C#创建目录 
//创建目录c:sixAge 
DirectoryInfod=Directory.CreateDirectory("c:\sixAge"); 
//d1指向c:sixAgesixAge1 
DirectoryInfod1=d.CreateSubdirectory("sixAge1"); 
//d2指向c:sixAgesixAge1sixAge1_1 
DirectoryInfod2=d1.CreateSubdirectory("sixAge1_1"); 
//将当前目录设为c:sixAge 
Directory.SetCurrentDirectory("c:\sixAge"); 
//创建目录c:sixAgesixAge2 
Directory.CreateDirectory("sixAge2"); 
//创建目录c:sixAgesixAge2sixAge2_1 
Directory.CreateDirectory("sixAge2\sixAge2_1"); 

StreamReader sr = new StreamReader(fileName,Encoding.GetEncoding("gb2312"));