How to retrieve all contacts from Microsoft Exchange using EWS Managed API? - exchange-server

Question

all I need to do is to retrieve all contacts from Microsoft Exchange. I did some research and the best possible option for me should be to use EWS Managed API. I am using Visual Studio and C# programming leanguage.
I think I am able to connect to Office365 account, because I am able to send a message in a program to specific email. But I am not able to retrieve the contacts.
If I create a contact directly in source code, the contact will be created in Office365->People aplication. But I don't know why! I thought I was working with Exchange aplication.
Summarize:
Is there any possibility how to get all contacts from Office365->Admin->Exchange->Acceptencers->Contacts ?
Here is my code:
class Program
{
static void Main(string[] args)
{
// connecting to my Exchange account
ServicePointManager.ServerCertificateValidationCallback = CertificateValidationCallBack;
ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2007_SP1);
service.Credentials = new WebCredentials("office365email#test.com", "password123");
/*
// debugging
service.TraceEnabled = true;
service.TraceFlags = TraceFlags.All;
*/
service.AutodiscoverUrl("office365email#test.com", RedirectionUrlValidationCallback);
// send a message works good
EmailMessage email = new EmailMessage(service);
email.ToRecipients.Add("matoskok1#gmail.com");
email.Subject = "HelloWorld";
email.Body = new MessageBody("Toto je testovaci mail");
email.Send();
// Create the contact creates a contact in Office365 -> People application..Don't know why there and not in Office365 -> Exchange
/*Contact contact = new Contact(service);
// Specify the name and how the contact should be filed.
contact.GivenName = "Brian";
contact.MiddleName = "David";
contact.Surname = "Johnson";
contact.FileAsMapping = FileAsMapping.SurnameCommaGivenName;
// Specify the company name.
contact.CompanyName = "Contoso";
// Specify the business, home, and car phone numbers.
contact.PhoneNumbers[PhoneNumberKey.BusinessPhone] = "425-555-0110";
contact.PhoneNumbers[PhoneNumberKey.HomePhone] = "425-555-0120";
contact.PhoneNumbers[PhoneNumberKey.CarPhone] = "425-555-0130";
// Specify two email addresses.
contact.EmailAddresses[EmailAddressKey.EmailAddress1] = new EmailAddress("brian_1#contoso.com");
contact.EmailAddresses[EmailAddressKey.EmailAddress2] = new EmailAddress("brian_2#contoso.com");
// Specify two IM addresses.
contact.ImAddresses[ImAddressKey.ImAddress1] = "brianIM1#contoso.com";
contact.ImAddresses[ImAddressKey.ImAddress2] = " brianIM2#contoso.com";
// Specify the home address.
PhysicalAddressEntry paEntry1 = new PhysicalAddressEntry();
paEntry1.Street = "123 Main Street";
paEntry1.City = "Seattle";
paEntry1.State = "WA";
paEntry1.PostalCode = "11111";
paEntry1.CountryOrRegion = "United States";
contact.PhysicalAddresses[PhysicalAddressKey.Home] = paEntry1;
// Specify the business address.
PhysicalAddressEntry paEntry2 = new PhysicalAddressEntry();
paEntry2.Street = "456 Corp Avenue";
paEntry2.City = "Seattle";
paEntry2.State = "WA";
paEntry2.PostalCode = "11111";
paEntry2.CountryOrRegion = "United States";
contact.PhysicalAddresses[PhysicalAddressKey.Business] = paEntry2;
// Save the contact.
contact.Save();
*/
// msdn.microsoft.com/en-us/library/office/jj220498(v=exchg.80).aspx
// Get the number of items in the Contacts folder.
ContactsFolder contactsfolder = ContactsFolder.Bind(service, WellKnownFolderName.Contacts);
Console.WriteLine(contactsfolder.TotalCount);
// 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 display name property.
view.PropertySet = new PropertySet(BasePropertySet.IdOnly, ContactSchema.DisplayName);
// 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 contact1 = item as Contact;
Console.WriteLine(contact1.DisplayName);
}
}
Console.ReadLine();
} // end of Main() method
/*===========================================================================================================*/
private static bool CertificateValidationCallBack(
object sender,
System.Security.Cryptography.X509Certificates.X509Certificate certificate,
System.Security.Cryptography.X509Certificates.X509Chain chain,
System.Net.Security.SslPolicyErrors sslPolicyErrors)
{
// If the certificate is a valid, signed certificate, return true.
if (sslPolicyErrors == System.Net.Security.SslPolicyErrors.None)
{
return true;
}
// If there are errors in the certificate chain, look at each error to determine the cause.
if ((sslPolicyErrors & System.Net.Security.SslPolicyErrors.RemoteCertificateChainErrors) != 0)
{
if (chain != null && chain.ChainStatus != null)
{
foreach (System.Security.Cryptography.X509Certificates.X509ChainStatus status in chain.ChainStatus)
{
if ((certificate.Subject == certificate.Issuer) &&
(status.Status == System.Security.Cryptography.X509Certificates.X509ChainStatusFlags.UntrustedRoot))
{
// Self-signed certificates with an untrusted root are valid.
continue;
}
else
{
if (status.Status != System.Security.Cryptography.X509Certificates.X509ChainStatusFlags.NoError)
{
// If there are any other errors in the certificate chain, the certificate is invalid,
// so the method returns false.
return false;
}
}
}
}
// When processing reaches this line, the only errors in the certificate chain are
// untrusted root errors for self-signed certificates. These certificates are valid
// for default Exchange server installations, so return true.
return true;
}
else
{
// In all other cases, return false.
return false;
}
}
private static bool RedirectionUrlValidationCallback(string redirectionUrl)
{
// The default for the validation callback is to reject the URL.
bool result = false;
Uri redirectionUri = new Uri(redirectionUrl);
// Validate the contents of the redirection URL. In this simple validation
// callback, the redirection URL is considered valid if it is using HTTPS
// to encrypt the authentication credentials.
if (redirectionUri.Scheme == "https")
{
result = true;
}
return result;
}
}

Answer 1

seems like you are already doing a good job doing a FindItems() method.
In order to get all contacts all you need to add is a SearchFilter, in this case I'd recommend doing the Exists() filter as you can simply say Find All contacts with an id.
See my example below if you need an example of a Full Windows Application dealing with contacts see my github page github.com/rojobo
Dim oFilter As New SearchFilter.Exists(ItemSchema.Id)
Dim oResults As FindItemsResults(Of Item) = Nothing
Dim oContact As Contact
Dim blnMoreAvailable As Boolean = True
Dim intSearchOffset As Integer = 0
Dim oView As New ItemView(conMaxChangesReturned, intSearchOffset, OffsetBasePoint.Beginning)
oView.PropertySet = BasePropertySet.IdOnly
Do While blnMoreAvailable
oResults = pService.FindItems(WellKnownFolderName.Contacts, oFilter, oView)
blnMoreAvailable = oResults.MoreAvailable
If Not IsNothing(oResults) AndAlso oResults.Items.Count > 0 Then
For Each oExchangeItem As Item In oResults.Items
Dim oExchangeContactId As ItemId = oExchangeItem.Id
//do something else
Next
If blnMoreAvailable Then oView.Offset = oView.Offset + conMaxChangesReturned
End If
Loop

Answer 2

How to retrieve all contacts from Microsoft Exchange using EWS Managed API?
If your question is how to retrieve the Exchange Contacts using EWS, you're already done with it.
Office365->People is just the right app to manipulate your Exchange contacts. If you check out the People app URL, it's something similar to https://outlook.office365.com/owa/?realm=xxxxxx#exsvurl=1&ll-cc=1033&modurl=2, owa is the synonym for outlook web app.