c#中对文件的操作小结(http://www.a2605.org/ddvipcom/program/c-/index1/134.htm)

1、建立一个文本文件
  public class fileclass
  {
   public static void main()
   {
   writetofile();
   }
   static void writetofile()
   {
   streamwriter sw;
   sw=file.createtext("c:\mytextfile.txt");
   sw.writeline("god is greatest of them all");
   sw.writeline("this is second line");
   sw.close();
   console.writeline("file created sucacessfully");
   }
  }
  
  2、读文件
  public class fileclass
  {
   public static void main()
   {
   readfromfile("c:\mytextfile.txt");
   }
   static void readfromfile(string filename)
   {
   streamreader sr;
   string s;
   sr=file.opentext(filename);
   s=sr.readline();
   while(s!=null)
   {
   console.writeline(s);
   s=sr.readline();
   }
   sr.close();
   }
  }
  
  3、追加操作
  
  public class fileclass
  {
   public static void main()
   {
   appendtofile();
   }
   static void appendtofile()
   {
   streamwriter sw;
   sw=file.appendtext("c:\mytextfile.txt");
   sw.writeline("this line is appended");
   sw.close();
   console.writeline("text appended successfully");
   }
  }