Develop Reference

ExchangeService FindItems Suddenly Intermittently Not Working

This has been working perfectly for probably a year or more, then suddenly, I think as of Saturday October 12th it started failing (FindResults returns no items);
//Tag the sent email so we can pull it back in a moment
Guid myPropertySetId = new Guid("{375a1079-a049-4c2d-a2e1-983d588cbed4}");
ExtendedPropertyDefinition myExtendedPropertyDefinition = new ExtendedPropertyDefinition(myPropertySetId, "TelEmailGuid", MapiPropertyType.String);
Guid telEmailGuid = Guid.NewGuid();
message.SetExtendedProperty(myExtendedPropertyDefinition, telEmailGuid.ToString());
//Send the email
message.SendAndSaveCopy(completedFolder);
//Find the sent email
ItemView view = new ItemView(1);
SearchFilter searchFilter = new SearchFilter.IsEqualTo(myExtendedPropertyDefinition, telEmailGuid.ToString());
view.PropertySet = new PropertySet(BasePropertySet.IdOnly);
FindItemsResults<Item> findResults = service.FindItems(completedFolder, searchFilter, view);
return DownloadEmail(findResults.FirstOrDefault().Id.ToString());
I tried tweaking things a little to wait before trying to find the e-mail, this has helped (now maybe 10% succeed). So, I then added a loop, so if not found it will try again a few times. But it seems that if it isn't found the first time, it is not found on subsequent attempts;
//Tag the sent email so we can pull it back in a moment
Guid myPropertySetId = new Guid("{375a1079-a049-4c2d-a2e1-983d588cbed4}");
ExtendedPropertyDefinition myExtendedPropertyDefinition = new ExtendedPropertyDefinition(myPropertySetId, "TelEmailGuid", MapiPropertyType.String);
Guid telEmailGuid = Guid.NewGuid();
message.SetExtendedProperty(myExtendedPropertyDefinition, telEmailGuid.ToString());
//Send the email
message.SendAndSaveCopy(completedFolder);
//Find the sent email
ItemView view = new ItemView(1);
SearchFilter searchFilter = new SearchFilter.IsEqualTo(myExtendedPropertyDefinition, telEmailGuid.ToString());
view.PropertySet = new PropertySet(BasePropertySet.IdOnly);
int attempt = 1;
System.Threading.Thread.Sleep(1000);
FindItemsResults<Item> findResults = service.FindItems(completedFolder, searchFilter, view);
while (findResults.TotalCount == 0 && attempt < 5)
{
findResults = service.FindItems(completedFolder, searchFilter, view);
attempt++;
}
return DownloadEmail(findResults.FirstOrDefault().Id.ToString());
Does anyone have any suggestions? I suspect it is a Microsoft issue but perhaps a different approach might allow us to workaround the issue.

It sounds like its an issue with the Search timing out because your not searching an indexed property as the FolderItem Count grow the performance of the search will decline over time (also other factors like server load etc will have a direct effect when searching for item in a Folder with a large item count).
Your search looks pretty static so you could create a Search Folder https://learn.microsoft.com/en-us/previous-versions/office/developer/exchange-server-2010/dd633690(v%3Dexchg.80) which would optimize the search.
The other thing you maybe be able to do is add a DateTime restriction for the search eg I have code that searches for messages based on the Internet MessageId and it has a similar problem when Item counts get large the search times out. So because I know what I'm searching for are always recent email adding a Date Time restriction fixed the issue in this instance eg
SearchFilter internetMessageIdFilter = new SearchFilter.IsEqualTo(PidTagInternetMessageId, InternetMessageId);
SearchFilter DateTimeFilter = new SearchFilter.IsGreaterThan(EmailMessageSchema.DateTimeReceived, DateTime.Now.AddDays(-1));
SearchFilter.SearchFilterCollection searchFilterCollection= new SearchFilter.SearchFilterCollection(LogicalOperator.And);
searchFilterCollection.Add(internetMessageIdFilter);
searchFilterCollection.Add(DateTimeFilter);

ExchangeService.FindItems()

I've been requested to create an application that should create a common base from 3 different email addresses sources and update each base taking the most common updated dataset.
Among the three sources I have an Exchange server Contacts addressbook. I know that I can access such data trough EWS and in specific I should probably use the ExchangeService.FindPeople() method or maybe FindPersona().
This should work but, since I'm looking only for new/updated contacts, it will load significantly the server (maybe not for new records but I cannot understand how to retrieve update records) and this it's not a good practice.
I've found in MSDN docs a way to be notified on updates on message base but there's nothin related on updates on contacts:
https://msdn.microsoft.com/en-us/library/office/dn458791(v=exchg.150).aspx
Is there something to be notified on updates on contacts (even trough third party products/APIs).
P.S. I would like to code in C# (or other .NET languages) but I'm open to anything else.

You should be able to check for newly created contacts by iterating through the contacts and accessing the DateTimeCreated property on each.
To check for updated contacts, you could use the LastModifiedTime property.
// Get the number of items in the Contacts folder.
ContactsFolder contactsfolder = ContactsFolder.Bind(service, WellKnownFolderName.Contacts);
// Set the number of items to the number of items in the Contacts folder or 50, whichever is smaller.
int numItems = contactsfolder.TotalCount < 50 ? contactsfolder.TotalCount : 50;
// Instantiate the item view with the number of items to retrieve from the Contacts folder.
ItemView view = new ItemView(numItems);
// To keep the request smaller, request only the DateTimeCreated and LastModifiedTime properties.
view.PropertySet = new PropertySet(BasePropertySet.IdOnly, ContactSchema.DateTimeCreated, ContactSchema.LastModifiedTime);
// Retrieve the items in the Contacts folder that have the properties that you selected.
FindItemsResults<Item> contactItems = service.FindItems(WellKnownFolderName.Contacts, view);
// Display the list of contacts.
foreach (Item item in contactItems)
{
if (item is Contact)
{
Contact contact = item as Contact;
if (contact.DateTimeCreated.Date == DateTime.Today.Date)
{
//Notify - Newly created contact
}
if (contact.LastModifiedTime.Date == DateTime.Today.Date)
{
//Notify - Newly modified contact
}
}
}

This is simple example to find contact by nikname. You can find a more advaced search here.
// Create a view with a page size of 1.
ItemView view = new ItemView(1);
// Create the search filter.
SearchFilter searchFilter = new SearchFilter.IsEqualTo(ContactSchema.NickName, "806555335");
FindItemsResults<Item> contactItems = service.FindItems(WellKnownFolderName.Contacts, searchFilter, view);
if(contactItems != null && contactItems.Count()>0){
//contact found!
Contact contact = contactItems.First() as Contact;
}

EWS search filter to find sender domain C#

I've create a small application that gets all my emails. I add each email to a list. However before I add them to a list I filter them. All of my filters are working apart from one. My search filter for filtering my email by sender is not working as I'm only trying to filter the domain and not the whole email address. For example xxx#xxx.com will filter however I want to filter out everything with xxx.com domain and for some reason it doesn't filter it. I tried using substring and this doesn't work either.
My code is as fallows
private static SearchFilter.SearchFilterCollection sFilter = new SearchFilter.SearchFilterCollection();
private static FindItemsResults<Item> findResults;
sFilter.Add(new SearchFilter.Not(new SearchFilter.ContainsSubstring(EmailMessageSchema.Sender, "#xxx.com",ContainmentMode.Substring,ComparisonMode.IgnoreCase)));
sFilter.Add(new SearchFilter.Not(new SearchFilter.Exists(EmailMessageSchema.InReplyTo)));
DateTime startTime = GetDateValueforFilter();
startTimefilter = new SearchFilter.IsGreaterThanOrEqualTo(EmailMessageSchema.DateTimeReceived, startTime);
sFilter.Add(startTimefilter);
sFilter.Add(startTimefilter);
findResults = service.FindItems(
WellKnownFolderName.Inbox
,sFilter
,new ItemView(25));
foreach (EmailMessage item in findResults.Items)
{
//if (item.IsRead == false)
//{
// if (item.InReplyTo == null)
// {
bool replyToAll = true;
string myReply = "This is the message body of the email reply.";
item.Reply(myReply, replyToAll);
item.IsRead = true;
item.Send();
//}
//}
}

I would suggest you try using the Extended Property PidTagSenderSmtpAddress https://msdn.microsoft.com/en-us/library/office/jj713594.aspx and try something like
ExtendedPropertyDefinition PidTagSenderSmtpAddress = new ExtendedPropertyDefinition(0x5D01,MapiPropertyType.String);
SearchFilter sf = new SearchFilter.ContainsSubstring(PidTagSenderSmtpAddress, "#yahoo.com");

Getting extended property from Exchange/Outlook appointment

I add an extended property in this way:
ExtendedPropertyDefinition ep = new ExtendedPropertyDefinition(DefaultExtendedPropertySet.CalendarAssistant, "AppointmentID", MapiPropertyType.Integer);
Appointment newApp = new Appointment(service);
newapp.SetExtendedProperty(ep, appID);
newApp.Save(SendInvitationsMode.SendToNone);
All is good. The appointment shows up in Outlook as expected.
Later I tried to search through all Outlook appointment with an AppointmentID assigned by:
List<SearchFilter> filters = new List<SearchFilter>();
filters.Add(new SearchFilter.Exists(ep));
filters.Add(new SearchFilter.IsLessThan(AppointmentSchema.Start, DateTime.Now.AddDays(60)));
filters.Add(new SearchFilter.IsGreaterThanOrEqualTo(AppointmentSchema.Start, DateTime.Today));
FindItemsResults<Item> allOutlookAppt = service.FindItems(WellKnownFolderName.Calendar, new SearchFilter.SearchFilterCollection(LogicalOperator.And, filters.ToArray()), viewFind);
allOutlookAppt returns the expected collection (calendar entries with AppointmentID set). However I could not retrieve the AppointmentID by this code:
foreach (var a in allOutlookAppt) // contains correct calendar entries!
{
object oid;
if (a.TryGetProperty(ep, out oid))
{
// a.TryGetProperty is always false, oid is always null thus never enter here!
}
}
What did I do wrong?
Edit: I tried a.ExtendedProperties.Count and it actually returns 0.

After googling a bit I have to add this before searching the calendar
viewFind.PropertySet = new PropertySet(ep);

Exchange Web Services: Batching with FindItemsResult<Item>

I'm writing an app to process email attachments, using Exchange Web Services.
The general structure of my problem area is as follows:
public static void Main()
{
FindItemsResults<Item> findResults = FindItems();
foreach (Item item in findResults)
{
DoSomethingWithItem(item);
}
}
public static FindItemsResults<Item> FindItems()
{
FindItemsResults<Item> findResults;
ItemView view = new ItemView(10); //batching 10 at a time
view.OrderBy.Add(ItemSchema.DateTimeReceived, SortDirection.Ascending);
view.PropertySet = new PropertySet(
BasePropertySet.IdOnly,
ItemSchema.Subject,
ItemSchema.DateTimeReceived);
findResults = service.FindItems(
WellKnownFolderName.Inbox,
new SearchFilter.SearchFilterCollection(
LogicalOperator.Or,
new SearchFilter.ContainsSubstring(ItemSchema.Subject, Properties.Settings.Default.EmailSubject)),
view);
//return set of emails
return findResults;
}
At first, this looked OK - it processed my earlier test examples perfectly well. But when I start testing with bulk loads, I realised that it was only processing the first 10 items, since I was specifying a batch size of 10 items (ItemView view = new ItemView(10)), but I wasn't checking for further batches.
I could have simply increased the batch size, but a quick google later, I found a better example:
public static FindItemsResults<Item> FindItems()
{
FindItemsResults<Item> findResults;
ItemView view = new ItemView(10, 0, OffsetBasePoint.Beginning);
view.OrderBy.Add(ItemSchema.DateTimeReceived, SortDirection.Ascending);
view.PropertySet = new PropertySet(
BasePropertySet.IdOnly,
ItemSchema.Subject,
ItemSchema.DateTimeReceived);
do
{
findResults = service.FindItems(
WellKnownFolderName.Inbox,
new SearchFilter.SearchFilterCollection(
LogicalOperator.Or,
new SearchFilter.ContainsSubstring(ItemSchema.Subject, Properties.Settings.Default.EmailSubject)),
view);
//any more batches?
if (findResults.NextPageOffset.HasValue)
{
view.Offset = findResults.NextPageOffset.Value;
}
}
while (findResults.MoreAvailable);
return findResults;
}
This loops through as many emails as I care to throw at it, but for reasons I can't yet understand, the foreach loop now only processes the first item in findResults.
Even though findResults contains more than one item (findResults.Items.Count > 1), with my second example, findResults.MoreAvailable = false. Fair enough, I've looped through the batches earlier, so it makes sense that I'm looking at the end of the last batch.
But how do I reset findResults so that it will process the whole lot? I tried setting findResults.MoreAvailable but it is readonly... What am I missing?
CONCLUSION:
OK, so I can either process the items one batch at a time, or I can add each item in each batch to a List and process them later, as I currently do.
There is not a lot between them; I've initially started using a List, but I'll consider the choice further.

It seems to my that your main problem is that you try define a function which returns FindItemsResults<Item>. If you use paring of results you will have not one object of this type. Instead of that on retrieving of every new page the FindItemsResults<Item> will be overwritten. Following example display subjects of all items from the Inbox:
ItemView view = new ItemView(10, 0, OffsetBasePoint.Beginning);
view.OrderBy.Add(ItemSchema.DateTimeReceived, SortDirection.Descending);
view.PropertySet = new PropertySet(
BasePropertySet.IdOnly,
ItemSchema.Subject,
ItemSchema.DateTimeReceived);
// save the folder where we will make searching to do this one time
Folder myInbox = Folder.Bind(service, WellKnownFolderName.Inbox);
FindItemsResults<Item> findResults;
do
{
findResults = myInbox.FindItems(
new SearchFilter.ContainsSubstring(ItemSchema.Subject,
Properties.Settings.Default.EmailSubject)),
view);
foreach (Item item in findResults)
{
// Do something with the item.
Console.WriteLine();
if (item is EmailMessage)
{
EmailMessage em = item as EmailMessage;
Console.WriteLine("Subject: \"{0}\"", em.Subject);
}
else if (item is MeetingRequest)
{
MeetingRequest mr = item as MeetingRequest;
Console.WriteLine("Subject: \"{0}\"", mr.Subject);
}
else
{
// we can handle other item types
}
}
//any more batches?
if (findResults.NextPageOffset.HasValue)
{
view.Offset = findResults.NextPageOffset.Value;
}
}
while (findResults.MoreAvailable);
The code display the subjects on the console output. If you want to use EmailMessage or MeetingRequest in another way you should modify the code correspondent. You can also define a delegate which do something with the found EmailMessage or MeetingRequest and call the delegate on the place of Console.WriteLine. If you do need to same all items somewhere, then you will have to create some collection like List<Item>, fill there in the function and return instead of FindItemsResults<Item> which you currently do.