C#使用Streamwriter打开文件的方法

using System;using System.IO;public class KtoD1 { public static void Main() {  string str;  StreamWriter fstr_out;  // Open the file directly using StreamWriter.  try {   fstr_out = new StreamWriter("test.txt");  }  catch(IOException exc) {   Console.WriteLine(exc.Message + "Cannot open file.");   return ;  }  Console.WriteLine("Enter text ('stop' to quit).");  do {   Console.Write(": ");   str = Console.ReadLine();   if(str != "stop") {    str = str + "/r/n"; // add newline    try {     fstr_out.Write(str);    } catch(IOException exc) {     Console.WriteLine(exc.Message + "File Error");     return ;    }   }  } while(str != "stop");  fstr_out.Close(); }}