在 Outlook 中，名为 pdf 文件没有来源。我收到错误，请尝试再次删除此文件，我该如何解决它

Question

我正在编写一个 Outlook 加载项。 在此插件中，我在 SDK 的帮助下上传附件。有时它执行上传过程没有任何问题，但有时代码会出现错误。我不明白为什么会出现这个问题。我该如何解决这个问题。

    {"ClassName":"System.IO.FileLoadException","Message":"Cannot save the attachment.","Data":null,"InnerException":null,"HelpURL":null,"StackTraceString":"   at Microsoft.Office.Interop.Outlook.Attachment.SaveAsFile(String Path)\r\n   at  OutlookAddIn.BusinessLayer.ThisAddin.ThisAddinMethod.LinkCollection(MailItem MailItemObj) in C:\\Users\\MYPC\\Desktop\\OfficeAddin\\OfficeAddins\\OutlookAddIn\\BusinessLayer\\ThisAddin\\ThisAddinMethod.cs:line 171","RemoteStackTraceString":null,"RemoteStackIndex":0,"ExceptionMethod":"8\nSaveAsFile\nOutlookAddIn, Version=3.0.0.0, Culture=neutral, PublicKeyToken=null\nMicrosoft.Office.Interop.Outlook.Attachment\nVoid SaveAsFile(System.String)","HResult":-2147024864,"Source":"Microsoft Outlook","WatsonBuckets":null,"FileLoad_FileName":null,"FileLoad_FusionLog":null}

    foreach (Attachment attach in MailItemObj.Attachments)
            {
                i = i + 1;
                string get = attach.PropertyAccessor.GetProperty("http://schemas.microsoft.com/mapi/proptag/0x3712001E");
                if (!html.Contains("cid:" + attach.DisplayName) && (string.IsNullOrEmpty(get) || !html.Contains("cid:" + get)))
                {
                    var name = attach.DisplayName;
                    try
                    {
                        var index = attachmentInfoList.FirstOrDefault(f=>f.Id==attach.Index);

                        string filePath = Path.Combine(tempPath, attach.DisplayName);
                        string mainDirectoryPath = Path.GetDirectoryName(filePath);
                        string extension = Path.GetExtension(filePath);
                        string fileName = Path.GetFileNameWithoutExtension(filePath);
                        var number = oldFileList.Count(y => y == name);
                        string customFilePath = string.Empty;
                        string newFileName = string.Empty;
                        string fullFileName = string.Empty;
                        if (index!=null)
                        {
                            if (index.NewFileName!=null)
                            {

                         
                            
                            customFilePath = Path.Combine(mainDirectoryPath, index.NewFileName);
                            fullFileName = Path.GetFileName(customFilePath);
                            
                             newFileName = Path.GetDirectoryName(customFilePath);
                             fullFileName = Path.GetFileName(customFilePath);
                            attach.SaveAsFile(customFilePath);
                            linkFileCollection.Add(new SDK.V2.OutlookDTO.LinkFile(ExtensionTask.GetStreamFromUrl(customFilePath), fullFileName) { Path = customFilePath });
                            }

                        }
                        else
                        {
                           
                            customFilePath = Path.Combine(mainDirectoryPath, fullFileName);
                            fullFileName = Path.GetFileName(customFilePath);
                      
                             newFileName = Path.GetDirectoryName(customFilePath);
                            //string fullFileName = Path.GetFileName(customFilePath);
                            attach.SaveAsFile(customFilePath);
                            linkFileCollection.Add(new SDK.V2.OutlookDTO.LinkFile(ExtensionTask.GetStreamFromUrl(customFilePath), fullFileName) { Path = customFilePath });

                        }



                    }
                    catch (System.Exception ex)
                    {
                        BusinessLayer.Logger.LogWriter.WriteLog(JsonConvert.SerializeObject(ex));
                        throw new System.InvalidOperationException("FileAttach: " + name + " " + lang.FileAttachError);
                    }
                }

            }

我有一个错误日志，该日志在顶部崩溃

Answer 1

听起来您的 RPC 通道已经用完了。避免使用多点表示法（尤其是在循环中），并在使用完所有对象后立即释放它们。请改用 for 循环：

Attachments attachments = inMailItem.Attachments;
for (int myCount = 1; myCount <= attachments.Count; myCount++)
{
  Attachment attach = attachments.Item(myCount);
  attach.SaveAsFile(attachmentFilePath);

  // release the attachment COM object after
  Marshal.ReleaseComObject(attach);
  attach = null;
}
Marshal.ReleaseComObject(attachments);

如果您在联机模式下使用 Exchange 存储，您可能会看到此类问题。 Exchange 服务器在每个对象级别跟踪每个客户端使用的 RPC 通道数。