.net - MemoryStream，无法访问关闭的流

Question

使用sharpPDF库，我生成了一个pdf内存流，并且我想直接通过电子邮件发送它。但是 ms.Seek(.... 行给出了一个 ObjectDisposeException;

Cannot access a closed Stream.

pdf.CreatePDF 方法采用(输出)文件名字符串或(输出)流。但我想它也会关闭流？我不太习惯使用流，所以如果你能建议应该如何完成？

可以在此处找到 CreatePDF 方法的 SharpPDF 源代码:

http://www.java2s.com/Open-Source/CSharp/PDF/SharpPDF/sharpPDF/pdfDocument.cs.htm

Public Sub SendPDF()
   Dim pdf As New sharpPDF.pdfDocument("Title", "Author")

   '....Generate pdf content

   Dim ms As New IO.MemoryStream
   pdf.CreatePDF(ms)

   Dim email As New EmailService
   email.Send(ms)

End Sub

Public Class EmailService
   Public Sub Send(Byval ms as Stream)
        ms.Seek(0, IO.SeekOrigin.Begin)

        Dim atc As New Attachment(ms, "Report.pdf")
        mail.Attachments.Add(atc)

        '....set other email parameters

        client.SendAsync(mail, mail.Subject)
  End Sub 
End Class

Answer 1

一种简单的方法是从关闭的 MemoryStream 中获取字节数组并创建另一个:

pdf.CreatePDF(ms)
ms = new MemoryStream(ms.ToArray())

Dim email As New EmailService
email.Send(ms)

请注意，调用 MemoryStream.ToArray 即可。在 MemoryStream 的关闭/处置实例上。甚至有记录:

Note
This method works when the MemoryStream is closed.