C# Exchange Web 服务 - 发送并立即检索已发送的消息

Question

我正在使用的系统要求将刚刚发送的电子邮件的 MimeContent 存储在本地数据库中。我对 Exchange 工作原理的理解是它将在服务器上创建 MimeContent 并且我无法访问它，除非我查询服务以获取刚刚发送的消息。

所以，我采取的步骤是：

-- 发送邮件并获取 Id

message.SendAndSaveCopy();
return message.Id.UniqueId;

-- 使用新的id获取刚刚发送的EmailMessage

ExchangeService exchangeService = ExchangeService;

var properties = new List<PropertyDefinitionBase>
{
    ItemSchema.MimeContent
};

EmailMessage message = EmailMessage.Bind(exchangeService, new ItemId(messageId), new PropertySet(BasePropertySet.IdOnly, properties));

当这段代码不间断地运行时，它就可以工作。返回的 Id 仍然有效（邮件可能在发件箱文件夹中），我得到了结果。但是，如果我放慢速度一秒钟，Id 将不再有效（我猜它现在已移至已发送文件夹）。

我不能就这样离开，因为不能保证我会及时返回服务器以检索带有 Id 的消息。

如果有一个解决方案让我不必再次查询消息服务，那就太棒了。但是，如果没有，有没有办法可以使用 Id 和 ChangeKey 来获取刚刚发送的电子邮件？

Answer 1

终于回答了我自己的问题。我通过在我控制的每封电子邮件上添加自定义属性来做到这一点。然后我使用相同的值来搜索电子邮件。我在查询之间的文件夹之间移动电子邮件时遇到一些问题，但现在已排序。

在某处定义它，我在我的 EmailProvider 中有它 class:

private readonly PropertyDefinitionBase _TempEmailId = new ExtendedPropertyDefinition(DefaultExtendedPropertySet.PublicStrings, "TempEmailId", MapiPropertyType.String);

然后在发送电子邮件之前添加它：

string messageId = null;
if (getTempId)
{
    messageId = Guid.NewGuid().ToString();
    message.SetExtendedProperty((ExtendedPropertyDefinition) _TempEmailId, messageId);
}

message.SendAndSaveCopy();
return messageId;

最后，使用 messageId 获取 MimeContent（或您想要的任何其他属性）：

/// <summary>
/// Get the mime content for an email just sent
/// </summary>
/// <param name="messageId"></param>
/// <returns></returns>
public byte[] GetJustSentMimeContent(string messageId)
{
    ExchangeService exchangeService = ExchangeService;

    // Use the following search filter to get mail with TempEmailId set to what we just got
    var searchCriteria = new SearchFilter.IsEqualTo(_TempEmailId, messageId);

    var itemView = new ItemView(1) {PropertySet = new PropertySet(BasePropertySet.IdOnly)};

    byte[] GetMimeContent(WellKnownFolderName folder)
    {
        var items = exchangeService.FindItems(folder, searchCriteria, itemView);

        if (items.TotalCount > 0)
        {
            // if it's still in there, try and load the properties for it
            exchangeService.LoadPropertiesForItems(items,
                new PropertySet(BasePropertySet.IdOnly,
                    ItemSchema.MimeContent));

            var emailMessage = (EmailMessage) items.First();

            // if the content has been loaded, return it
            if (emailMessage.MimeContent != null)
                return emailMessage.MimeContent.Content;
        }

        return null;
    }

    // check the drafts folder to see if it's still in there
    var mimeContent = GetMimeContent(WellKnownFolderName.Drafts);

    if (mimeContent != null)
        return mimeContent;

    // if at this point, either: 
    // - email was moved to SentItems before the first search was done
    // - or email was found in Drafts but then moved to SentItems but before the MimeContent could be loaded. Need to restart the process and find the email in SentItems instead

    // should be in here (sentItems) now, try and load the properties for it
    return GetMimeContent(WellKnownFolderName.SentItems);
}

C# Exchange Web 服务 - 发送并立即检索已发送的消息

C# Exchange web service - send and immediately retrieve sent message

c#

asp.net

email

exchange-server