C#之IO读写文件方法封装代码

/// <summary>
  /// 功能：filestream文件流读取文件
  /// </summary>
  /// <param name="filepath">参数：文件路径</param>
  /// <returns>返回值：streamreader对象</returns>
  public static streamreader readfilebyfs(string filepath)
  {
   filestream fs = null;
   streamreader sr = null;
   try
   {
    fs = new filestream(filepath, filemode.openorcreate, fileaccess.read);
    sr = new streamreader(fs, encoding.default);
   }
   catch (ioexception e)
   {
    throw e;
   }
   return sr;
  }

 /// <summary>
  /// 功能：filestream文件流写文件
  /// </summary>
  /// <param name="filepath">参数：文件路径</param>
  /// <returns>返回值：streamwriter对象</returns>
  public static streamwriter writefilebyfs(string filepath)
  {
   filestream fs = null;
   streamwriter sw = null;
   try
   {
    fs = new filestream(filepath, filemode.openorcreate, fileaccess.write);
    sw = new streamwriter(fs, encoding.default);
   }
   catch (ioexception e)
   {
    throw e;
   }
   return sw;
  }