如何获得邮件项目的项目ID在Exchange 2010中

Question

我正在使用C＃Exchaneg Web服务检索所有从邮箱的邮件Exchange 2010上

我把所有的信息，每封电子邮件中一个返回给调用函数的数据表。

我还需要每个电子邮件的唯一项目ID，以便在完成后，我可以将该电子邮件标记为在交换框上阅读。

我已经试过这样：

// As a best practice, limit the properties returned to only those that are required. 
    PropertySet propSet = new PropertySet(BasePropertySet.IdOnly, ItemSchema.Subject); 

    // Bind to the existing item by using the ItemId. 
    // This method call results in a GetItem call to EWS. 
    ItemId itemID = Item.Bind(service, itemId, propSet); 

，但它不会编译，我不明白什么是错的，我需要的产品ID，这样我可以储存它，后来发现在同一项目为了将其标记阅读

这里是代码的主要块：

//creates an object that will represent the desired mailbox 
Mailbox mb = new Mailbox(common.strInboxURL); // new Mailbox(targetEmailAddress); @"bbtest@bocuk.local" 

//creates a folder object that will point to inbox fold 
FolderId fid = new FolderId(WellKnownFolderName.Inbox, mb); 

//this will bind the mailbox you're looking for using your service instance 
Microsoft.Exchange.WebServices.Data.Folder inbox = Microsoft.Exchange.WebServices.Data.Folder.Bind(service, fid); 

SearchFilter.SearchFilterCollection searchFilterCollection = new SearchFilter.SearchFilterCollection(LogicalOperator.And); 
searchFilterCollection.Add(new SearchFilter.IsEqualTo(EmailMessageSchema.IsRead, false)); 
searchFilterCollection.Add(new SearchFilter.IsEqualTo(EmailMessageSchema.HasAttachments, true)); 
searchFilterCollection.Add(new SearchFilter.ContainsSubstring(EmailMessageSchema.Sender, "@bankofcyprus.co.uk")); 

// add the exceptions 
for (int iEx = 0; iEx < e2c.emailExceptions.Count; iEx++) 
{ 
    searchFilterCollection.Add(new SearchFilter.Not(new SearchFilter.ContainsSubstring(EmailMessageSchema.Subject, e2c.emailExceptions[iEx])));     
} 

ItemView view = new ItemView(100); 
view.OrderBy.Add(ItemSchema.DateTimeReceived, SortDirection.Ascending); 
//view.PropertySet = new PropertySet(
// BasePropertySet.IdOnly, 
// ItemSchema.Subject, 
// ItemSchema.DateTimeReceived); 

// 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, searchFilterCollection, view); 

foreach (EmailMessage email in results) 
// looping through all the emails 
{ 
    emailSenderName = email.Sender.Name; 
    sEmailSubject = email.Subject; 
    emailAttachmentsCount = email.Attachments.Count; 
    emailDisplayTo = email.DisplayTo; 
    emailHasAttachments = email.HasAttachments; 

    email.Load(new PropertySet(ItemSchema.Body) { RequestedBodyType = BodyType.Text }); 
    sEmailBody = email.Body; 

    // As a best practice, limit the properties returned to only those that are required. 
    PropertySet propSet = new PropertySet(BasePropertySet.IdOnly, ItemSchema.Subject); 

    // Bind to the existing item by using the ItemId. 
    // This method call results in a GetItem call to EWS. 
    ItemId itemID = Item.Bind(service, itemId, propSet); 


    //email.get .Load(new PropertySet(ItemId): 
    email.Load(new PropertySet(ItemSchema.DateTimeReceived)); 

    DataRow row = emails.NewRow(); 

    row["displayname"] = emailDisplayTo; 
    ... (cut for brevity! 
    email.Load(new PropertySet(EmailMessageSchema.Attachments)); 

我怎样才能获得该项目的ID吗？

Answer 1

Item.Bind返回一个Item，而不是ItemId，所以你得到一个编译时错误。你已经有了ItemId。它就在您每次迭代获得的EmailMessage上，除非您指的是Exchange中的其他ID，例如EntryId。

ItemId itemID = email.Id; 

不过，如果您想要更新该代码块或其附近的项目，这是不必要的。为此，您只需进行更改（将它们标记为已读），然后将它们放入List或其他IEnumerable中，并使用ExchangeService.UpdateItems更新EmailMessages。

如果您想要存储ItemIds供以后使用，您应该知道ItemId不是永久的，不变的属性。如果有问题的项目被移动到另一个邮箱或移动到另一个文件夹，它将会改变。可能还有其他一些可以改变它的情况，例如服务包安装/版本升级，甚至是足够的时间，尽管我自己无法确认这些情况。

编辑：要回答下面的语句，看起来ContainsSubstring不适用于电子邮件地址。你可以用queryString做到这一点：

String queryString = "from:domain.co.uk AND isread:false AND hasattachment:true"; 

试试看。取决于你想如何做，我的语法可能会变得很糟糕。外汇大师格伦尺度上，有几个链接对AQS有点散MS文档一篇好的博客贴子：

http://gsexdev.blogspot.com/2010/08/using-exchange-search-and-aqs-with-ews.html