如何查询Exchange mail server中的电子邮件项目？

Question

我正在尝试升级现有的应用程序，使用WebDAV读取Exchange 2003。邮件服务器将升级到Exchange 2013，所以我正在检查如何使用EWS。

我有一个问题，虽然我知道收件箱中有带附件的未读项目，但我对FindItems对象运行的查询返回空。。。

以下是我的代码片段：

private static void GetAttachments(ExchangeService service)
{
    // Return a single item.
    ItemView view = new ItemView(100);
    ServicePointManager.ServerCertificateValidationCallback = CertificateValidationCallBack;
    ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2010_SP2);// .Exchange2007_SP1);

    service.UseDefaultCredentials = true;
    service.AutodiscoverUrl("[e-mail]", RedirectionUrlValidationCallback);

    ItemView view = new ItemView(1);

    string querystring = "HasAttachments:true Subject:'ATTACHMENT TEST' Kind:email";

    // Find the first email message in the Inbox that has attachments. 
    // This results in a FindItem operation call to EWS.
    FindItemsResults<Item> results = service.FindItems(WellKnownFolderName.Inbox, querystring, view);

    //FindItemsResults<Item> results = service.FindItems(WellKnownFolderName.Inbox, new ItemView(50));

    if (results.TotalCount > 0)
        {
            // looping through all the emails
            for (Int16 iDx = 0; iDx < results.TotalCount-1; iDx++)
            {

                EmailMessage email = results.Items[iDx] as EmailMessage;

                if (email.IsRead == false) { 

                    // Request all the attachments on the email message. This results in a GetItem operation call to EWS.
                    email.Load(new PropertySet(EmailMessageSchema.Attachments));

                    foreach (Attachment attachment in email.Attachments)
                    {
                        if (attachment is FileAttachment)
                        {
                            FileAttachment fileAttachment = attachment as FileAttachment;

我应该做的是读取目标收件箱（只有一台Exchange服务器）中所有未读的电子邮件，并将附件存储在磁盘上，这样我就可以将它们作为附件添加到SalesForce的新案例中。

我哪里出错了？

此外，这一行：

ItemView view = new ItemView(100);

是：

ItemView view = new ItemView(1);

这肯定只会查找一个电子邮件项目，对吗？

Answer 1

我提交了以下XML并获得了预期的结果。了解情况的最简单方法是查看XML。

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"
               xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types">
 <soap:Header>
    <t:RequestServerVersion Version="Exchange2010_SP2"/>
  </soap:Header>
<soap:Body>
    <FindItem xmlns="http://schemas.microsoft.com/exchange/services/2006/messages"
               xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types"
              Traversal="Shallow">
      <ItemShape>
        <t:BaseShape>IdOnly</t:BaseShape>
      </ItemShape>
      <ParentFolderIds>
        <t:DistinguishedFolderId Id="inbox"/>
     </ParentFolderIds>
      <QueryString>HasAttachments:true Subject:'ATTACHMENT TEST' Kind:email</QueryString>
    </FindItem>
  </soap:Body>
</soap:Envelope>