c# – searchFilter与EWS FindItems方法调用无法正常工作

我没有问题连接到服务,并打开邮箱.

问题是我的searchFilter被忽略,所有电子邮件都被请求返回到EWS.

这是我的代码：

static void Main(string[] args)
{
ServicePointManager.ServerCertificateValidationCallback = CertificateValidationCallBack;

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

// Find all items where the body contains "move reports".
//string qstring = "Body:"move reports"";

// Identify the item properties to return.
//view.PropertySet = new PropertySet(BasePropertySet.IdOnly,//ItemSchema.Subject);

//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
Folder inbox = Folder.Bind(service,fid);

List<SearchFilter> searchFilterCollection = new List<SearchFilter>();

searchFilterCollection.Add(new SearchFilter.SearchFilterCollection(LogicalOperator.And,new SearchFilter.IsEqualTo(EmailMessageSchema.IsRead,false)));
searchFilterCollection.Add(new SearchFilter.SearchFilterCollection(LogicalOperator.And,new SearchFilter.IsEqualTo(EmailMessageSchema.HasAttachments,true)));
searchFilterCollection.Add(new SearchFilter.Not(new SearchFilter.ContainsSubstring(ItemSchema.Subject,"FATS")));
searchFilterCollection.Add(new SearchFilter.Not(new SearchFilter.ContainsSubstring(ItemSchema.Subject,"Assignment")));
searchFilterCollection.Add(new SearchFilter.Not(new SearchFilter.ContainsSubstring(ItemSchema.Subject,"Sandbox: Assignment")));

SearchFilter searchFilter = new SearchFilter.SearchFilterCollection(LogicalOperator.Or,searchFilterCollection.ToArray());

ItemView view = new ItemView(100);

string sAttachmentPath = "C:DevEWSHelloWorldattachments";

// 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,searchFilter,view);

foreach (EmailMessage email in results)
// looping through all the emails
{

System.Diagnostics.Debug.Write("Found attachemnt on msg with subject: " + email.Subject);

.... code removed for brevity!

因此,根据我对searchFilter的理解,只应返回带有附件的未读电子邮件,并且不应将FATS或Sandbox：Assignment作为主题.

但这不起作用,对EWS的请求只是返回所有电子邮件.

我做错了什么？