Exchange WebService - Errorcode ErrorIncorrectUpdatePropertyCount when updateing contact - c#-4.0

Question

I use the fallowing method to update a contact in Exchange over EWS:
private void UpdateContact(Microsoft.Exchange.WebServices.Data.Contact exContact, ContactInfo contact) {
var pathList = new List<string>();
try {
log.DebugFormat("Process ExchangeContact '{0}' with Contact '{1}'", (exContact.IsNew ? "<new>" : exContact.DisplayName), contact.Id);
exContact.GivenName = contact.AdditionalName;
exContact.Surname = contact.Name;
exContact.FileAsMapping = FileAsMapping.SurnameCommaGivenName;
exContact.CompanyName = "";
if (contact is PersonInfo) {
var person = (PersonInfo) contact;
if (person.PersonCompany != null && person.PersonCompany.Company != null) {
exContact.CompanyName = person.PersonCompany.Company.DisplayName;
}
exContact.ImAddresses[ImAddressKey.ImAddress1] = person.MessengerName;
exContact.ImAddresses[ImAddressKey.ImAddress2] = person.SkypeName;
}
// Specify the business, home, and car phone numbers.
var comm = contact.GetCommunication(Constants.CommunicationType.PhoneBusiness);
exContact.PhoneNumbers[PhoneNumberKey.BusinessPhone] = (comm != null ? comm.Value : null);
comm = contact.GetCommunication(Constants.CommunicationType.PhonePrivate);
exContact.PhoneNumbers[PhoneNumberKey.HomePhone] = (comm != null ? comm.Value : null);
comm = contact.GetCommunication(Constants.CommunicationType.PhoneMobile);
exContact.PhoneNumbers[PhoneNumberKey.MobilePhone] = (comm != null ? comm.Value : null);
comm = contact.GetCommunication(Constants.CommunicationType.MailBusiness);
exContact.EmailAddresses[EmailAddressKey.EmailAddress1] = (comm != null ? new EmailAddress(comm.Value) : null);
comm = contact.GetCommunication(Constants.CommunicationType.MailPrivate);
exContact.EmailAddresses[EmailAddressKey.EmailAddress2] = (comm != null ? new EmailAddress(comm.Value) : null);
// Specify two IM addresses.
// Specify the home address.
var address = contact.AddressList.FirstOrDefault(x => x.AddressType != null && x.AddressType.Id == Constants.AddressType.Private);
if (address != null) {
var paEntry = new PhysicalAddressEntry
{
Street = address.Street,
City = address.City,
State = address.Region,
PostalCode = address.PostalCode,
CountryOrRegion = address.CountryName
};
exContact.PhysicalAddresses[PhysicalAddressKey.Home] = paEntry;
if (contact.PostalAddress == address) {
exContact.PostalAddressIndex = PhysicalAddressIndex.Home;
}
} else {
exContact.PhysicalAddresses[PhysicalAddressKey.Home] = null;
}
address = contact.AddressList.FirstOrDefault(x => x.AddressType != null && x.AddressType.Id == Constants.AddressType.Business);
if (address != null) {
var paEntry = new PhysicalAddressEntry
{
Street = address.Street,
City = address.City,
State = address.Region,
PostalCode = address.PostalCode,
CountryOrRegion = address.CountryName
};
exContact.PhysicalAddresses[PhysicalAddressKey.Business] = paEntry;
if(contact.PostalAddress == address) {
exContact.PostalAddressIndex = PhysicalAddressIndex.Business;
}
} else {
exContact.PhysicalAddresses[PhysicalAddressKey.Business] = null;
}
// Save the contact.
if (exContact.IsNew) {
exContact.Save();
} else {
exContact.Update(ConflictResolutionMode.AlwaysOverwrite);
}
pathList.AddRange(this.AddFileAttachments(this.Access.IndependService.GetContact(exContact.Id.UniqueId), contact.GetDocuments()));
} catch(Exception e) {
log.Error("Error updating/inserting Contact in Exchange.", e);
} finally {
foreach (var path in pathList) {
this.Access.Context.Container.Resolve<IDocumentService>().UndoCheckOut(path);
}
}
}
When I do this for update, I get an Exception with Errorcode ErrorIncorrectUpdatePropertyCount on the line exContact.Update(ConflictResolutionMode.AlwaysOverwrite);
Can someone help me, what is the problem? - Thanks.

Answer 1

The solution is that I have to check, if the string-values are empty strings and in this case to set null. On this way, all is working.