Question

我有一个类，我已经声明了一个FileStream和一个StreamReader：

选项严格关闭选项明确的

Friend Class clsFileReader

    Private _fs As IO.FileStream
    Private _sr As IO.StreamReader

我想问我是否明确需要关闭这些：

Protected Overrides Sub Finalize()

    _fs.Close()
    _sr.Close()

End Sub

...或者如果这是自动完成的。

感谢您的帮助！

ps：我不能使用＆＃34;使用＆＃34;因为我想逐行读取文件：

Public Function ReadLine() As String
    Debug.Assert(Not _sr.EndOfStream)

    _sCurrentLineString = _sr.ReadLine

    _iCurentLineIndex = _iCurentLineIndex + 1

    Return _sCurrentLineString

End Function

Answer 1

我建议您使用与流中相同的功能。完成IDisposable界面并在完成后对类实例调用.Dispose。与您对流的处理方式相同。

这是一个简单的例子。

Class clsFileReader : Implements IDisposable

   Private _fs As IO.FileStream
   Private _sr As IO.StreamReader

   ' Flag: Has Dispose already been called? 
   Dim disposed As Boolean = False 

   ' Public implementation of Dispose pattern callable by consumers. 
   Public Sub Dispose() _
              Implements IDisposable.Dispose
      Dispose(True)
      GC.SuppressFinalize(Me)           
   End Sub 

   ' Protected implementation of Dispose pattern. 
   Protected Overridable Sub Dispose(disposing As Boolean)
      If disposed Then Return 

      If disposing Then 
         ' Free any other managed objects here. 
         ' 
         _fs.Close()
         _sr.Close()
      End If 

      ' Free any unmanaged objects here. 
      '
      disposed = True 
   End Sub 

   Protected Overrides Sub Finalize()
      Dispose(False)      
   End Sub 

End Class

VB.NET我是否需要在类finalize中关闭文件流？

1 个答案: