Question

我试图在EmailMessage对象中迭代附件。

我收到错误＆＃34;附件无法更新＆＃34;在这一行：

fa.ContentId = fa.Id;

我的代码是：

EmailMessage emailMsg = EmailMessage.Bind(service, new ItemId(emailId), new PropertySet(BasePropertySet.IdOnly, ItemSchema.Attachments,ItemSchema.Body,ItemSchema.DateTimeReceived,EmailMessageSchema.DisplayCc,EmailMessageSchema.DisplayTo,EmailMessageSchema.Subject,EmailMessageSchema.From));
            this.Email = msgItem;
            this.Email.Load();
            // make sure email has id or contentid
            foreach (Attachment attachment in this.Email.Attachments)
            {
                FileAttachment fa = attachment as FileAttachment;
                if (fa.ContentId == null && fa.Id != null)
                {
                    fa.Load();
                    fa.ContentId = fa.Id; // error attachments can't be updated
                }
            }

由于

Answer 1

您无法更新现有Exchange项目上的附件，例如，唯一有效的附件操作是获取，创建，删除没有更新。您可以设置ContentId的唯一有效上下文是在CreateAttachment操作中创建此属性的Message时。要更新现有附件，您必须将其删除，然后将其重新添加为新附件。您实际尝试使用代码实现的目标是什么？

干杯格伦

EWS附件无法更新错误

1 个答案: