c#中對文件的操作小結 
1、建立一個文本文件 
  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、讀文件 
  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"); 
   } 
  }