Question

我编写了一种将outlook电子邮件附件保存到硬盘并将文件转换为Base64String的方法。当我保存附件时，嵌入的（内联）图像也会被保存，即使它们不是REAL附件。我只想保存真正的附件。然后我修改了如下方法。但是现在我从“.OfType（）”行得到一个错误。

这是我的代码：

private string GetBase64StringForAttachments(Outlook.MailItem mailItem)
        {
            StringBuilder builder = new StringBuilder();
            Outlook.Attachments mailAttachments = mailItem.Attachments;

            try
            {                
                if (mailAttachments != null)
                {                    
                    Regex reg = new Regex(@"<img .+?>", RegexOptions.Singleline | RegexOptions.CultureInvariant | RegexOptions.IgnoreCase);
                    MatchCollection matches = reg.Matches(mailItem.HTMLBody);

                    for (int i = 1; i <= mailAttachments.Count; i++)
                    {
                        Outlook.Attachment currentAttachment = mailAttachments[i];

                        bool isMatch = matches
                          .OfType<Match>()
                          .Select(m => m.Value)
                          .Where(s => s.IndexOf("cid:" + currentAttachment.FileName, StringComparison.InvariantCultureIgnoreCase) >= 0)
                          .Any();

                        MessageBox.Show(currentAttachment.FileName + ": " + (isMatch ? "Inline Image" : "Attached Image"));

                        if (currentAttachment != null)
                        {

                            string date = DateTime.Now.ToString("yyyymmddhhmmss");
                            string path = "C:\\test\\" + date + currentAttachment.FileName; //ToDo: Create Folder
                            currentAttachment.SaveAsFile(path);

                            FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read);
                            byte[] filebytes = new byte[fs.Length];
                            fs.Read(filebytes, 0, Convert.ToInt32(fs.Length));
                            string encodedData = Convert.ToBase64String(filebytes, Base64FormattingOptions.InsertLineBreaks);
                            builder.Append(encodedData).Append(",");

                            Marshal.ReleaseComObject(currentAttachment);
                        }
                    }

                    if (builder.Length > 0)
                    {                        
                        string encodedAttachments = builder.ToString().Remove(builder.ToString().Length-1);
                        return builder.ToString();
                    }
                    else
                        return "";

                }
                else return "";
            }
            catch (Exception ex)
            {
                Debug.DebugMessage(2, "Error in GetBase64StringForAttachments : in AddinModule " + ex.Message);
                return "";
            }
            finally
            {
                Marshal.ReleaseComObject(mailAttachments);                
            }
        }

这是错误讯息：

'System.Text.RegularExpressions.MatchCollection'不包含'OfType'的定义，也没有接受第一个类型为'System.Text.RegularExpressions.MatchCollection'的扩展方法'OfType'（你是否遗漏了） using指令或程序集引用？）

我需要什么：

我不是LINQ的忠实粉丝。那么，请你就此建议我
有更好的方法吗？

我已经尝试过按照这些问题的建议答案，但它们对我不起作用

Saving only the REAL attachments of an Outlook MailItem

Don't save embed image that contain into attachements (like signature image)

有没有办法使用Redemption来区分真实的附件？

Answer 1

是的，Redemption公开RDOAttachment。Hidden属性 - 它检查HTML正文以确保附件不用作内嵌图像。

另请注意，您可以使用RDOAtttachment。AsArray访问附件数据，而无需先将附件保存为文件。

Redemption.RDOSession rSession = new Redemption.RDOSession();
rSession.MAPIOBJECT = mailItem.Application.Session.MAPIOBJECT;
Redemption.RDOMail rMail= rSession.GetRDOFolderFromOutlookObject(mailItem)
foreach (Redemption.RDOAttachment attach in rMail.Attachments)
{
  if ((attach.Type == Redemption.rdoAttachmentType.olByValue) && (!attach.Hidden))
  {
     attach.SaveAsFile(path);
  }
}
next

Answer 2

using Attachment = MsgReader.Outlook.Storage.Attachment;

foreach (Attachment attachment in mailItem.Attachments.Where(a => ((Attachment)a).Hidden == false)) {
  // do whatever you want with the 'real' attachments.
}

保存Outlook电子邮件附件时如何避免嵌入（内联）图像

2 个答案: