使用System.Threading.ThreadPool時沒有內容的電子郵件

Question

我遇到了一個奇怪的行爲，試圖使用Threading.ThreadPool發送電子郵件。

這已經工作了一年多了，但最近它已經聲明要間歇地發送沒有內容的電子郵件。收件人和主題都很好，但是，其餘的電子郵件是空白的。沒有什麼改變了代碼的明智之處（除了它運行的服務器的Windows更新）。

下面是我使用的代碼 - 有沒有人有我如何可以縮小問題發生的位置的建議？在將電子郵件重新發送給聲稱收到空白電子郵件的人時，他們可以很好地使用它 - 它使用與發送的第一個完全相同的代碼。

子生成電子郵件：

Public Sub EmailConfirmation(email As String, 
           firstname As String, 
           details As String) 

     Try 


      Dim embody As String = GlobalHelper.emailBody 
      'static class which loads the email text at application load for use later. 
      'This is a point of concern because it's obviously where the embody text is 
      'is loaded, but the issue is intermittent and if there was a failure here surely 
      'it would be caught by the 'try...catch' and a log of the error created (which has 
      'never happened). I also ran an experiment for a while where if this string was 
      'empty then create a log entry. After receiving a complaint of a blank email 
      'no error log was found. 

      embody = Replace(embody, "[FirstName]", firstname) 
      embody = Replace(embody, "[DATA]", details) 


      'create the mail message 
      Dim mail As New MailMessage() 

      'set the addresses 
      mail.From = New MailAddress("myemail@mydomain.com", "My Display Name") 
      mail.To.Add(email) 
      mail.IsBodyHtml = True 

      'set the content 
      mail.Subject = "Email Subject!" 
      mail.Body = embody 


      AddEmailToThreadPool(mail) 

     Catch ex As Exception 

     'if there is an error it is logged here. 

     End Try 


    End Sub 

分，增加了線程池：

Private Sub AddEmailToThreadPool(email As MailMessage) 
     System.Threading.ThreadPool.QueueUserWorkItem(New System.Threading.WaitCallback(AddressOf sendEmail), email) 
    End Sub 

子發送電子郵件：

Private Sub sendEmail(stateinfo As Object) 

     Dim email As MailMessage = CType(stateinfo, MailMessage) 


     Try 

      'send the message 
      Dim smtp As New SmtpClient("mail.mydomain.com") 
      smtp.Send(email) 
     Catch ex As Exception 
      'error is logged here. 
     End Try 

    End Sub 

Answer 1

那麼，修復不正確的doc類型聲明後，我幾乎沒有在一個月內對空白電子郵件進行過一次投訴。雖然我不確定爲什麼，但我會假設這可以解決所有問題。

感謝您的所有輸入/幫助。

Answer 2

我從MSDN複製MailMessage class

此類型的任何公共靜態（Visual Basic中的Shared）成員都是線程安全的。任何實例成員不保證是線程安全的。