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Archive for the ‘Exchange development’ Category

Reading extended properties using EWS managed API

Posted by Torben M. Philippsen on June 20, 2011

Having been working with Exchange 2007 Web Services (EWS) for a couple af years a recent bug led me to testing various scenarios regarding appointment items using the EWS Managed API instead of the proxy classes that I have grown used to working with.

One of my struggles was to read the extended properties that we use. Having gotten it all to work I though that I’d create this post. Below you will find my code sample:

This first snippet set up the service connection using autodiscover.

        private ExchangeService GetService()


            ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2007_SP1);

            service.Credentials = new NetworkCredential(Settings.Default.ConnectingUser, Settings.Default.ConnectingUserPassword, Settings.Default.ConnectingUserDomain);

            service.ImpersonatedUserId = new ImpersonatedUserId(ConnectingIdType.SID, Settings.Default.ImpersonatedUserSID);

            service.Url = new Uri(Settings.Default.EWSURL);

            return service;


This second snippet defines and fetches the standard properties as well as the extended properties.

        private void btnGetItem_Click(object sender, EventArgs e)


            string itemId = txtItemId.Text;

            ExchangeService service = GetService();

            AlternateId sourceId = new AlternateId(IdFormat.EwsLegacyId, itemId, Settings.Default.ImpersonatedUserMailbox);

            AlternateId destinationId = service.ConvertId(sourceId, IdFormat.EwsId) as AlternateId;


            //define the extended properties that should be fetched

            ExtendedPropertyDefinition rmsIsRms = new ExtendedPropertyDefinition(DefaultExtendedPropertySet.PublicStrings, “RMS-IsRMS”, MapiPropertyType.Boolean);

            ExtendedPropertyDefinition rmsCustomerProp = new ExtendedPropertyDefinition(DefaultExtendedPropertySet.PublicStrings, “RMS-CustomerProp”, MapiPropertyType.String);

            ExtendedPropertyDefinition rmsInternalProp = new ExtendedPropertyDefinition(DefaultExtendedPropertySet.PublicStrings, “RMS-InternalProp”, MapiPropertyType.Boolean);

            ExtendedPropertyDefinition rmsProjectProp = new ExtendedPropertyDefinition(DefaultExtendedPropertySet.PublicStrings, “RMS-ProjectProp”, MapiPropertyType.String);

            ExtendedPropertyDefinition rmsActivityProp = new ExtendedPropertyDefinition(DefaultExtendedPropertySet.PublicStrings, “RMS-ActivityProp”, MapiPropertyType.String);

            ExtendedPropertyDefinition[] userFields = new ExtendedPropertyDefinition[] { rmsIsRms, rmsActivityProp, rmsCustomerProp, rmsInternalProp, rmsProjectProp };

            //get the item and it’s extended properties

            PropertySet extendedPropertySet = new PropertySet(BasePropertySet.FirstClassProperties, userFields);

            Appointment item = (Appointment)Item.Bind(service, new ItemId(destinationId.UniqueId), extendedPropertySet);

            //having the item – get the extended properties

            object isRMS;

            object customerProp;

            object isInternalProp;

            object projectProp;

            object activityProp;

            //Print properties

            rtItemProps.AppendText(“ItemClass: “ + item.ItemClass + “\n”);

            rtItemProps.AppendText(“Subject: “ + item.Subject + “\n”);

            rtItemProps.AppendText(“CalendarItemType: “ + item.AppointmentType.ToString() + “\n”);

            rtItemProps.AppendText(“Organizer: “ + item.Organizer.Name + “\n”);

            rtItemProps.AppendText(“OrganizerEmail: “ + item.Organizer.Address + “\n”);

            rtItemProps.AppendText(“Start: “ + item.Start + “\n”);

            rtItemProps.AppendText(“End: “ + item.End + “\n”);

            rtItemProps.AppendText(“Location: “ + item.Location + “\n”);

            rtItemProps.AppendText(“Free/busy: “ + item.LegacyFreeBusyStatus.ToString() + “\n”);

            rtItemProps.AppendText(“—————RMS INFO————–\n”);

            //extended properties are printed only if they exist

            if (item.TryGetProperty(rmsIsRms, out isRMS) && isRMS != null)


                rtItemProps.AppendText(“IsRMS: “ + isRMS.ToString() + “\n”);


            if (item.TryGetProperty(rmsCustomerProp, out customerProp) && customerProp != null)


                rtItemProps.AppendText(“Customer: “ + customerProp.ToString() + “\n”);


            if (item.TryGetProperty(rmsProjectProp, out projectProp) && projectProp != null)


                rtItemProps.AppendText(“Project: “ + projectProp.ToString() + “\n”);


            if (item.TryGetProperty(rmsActivityProp, out activityProp) && activityProp != null)


                rtItemProps.AppendText(“Activity: “ + activityProp.ToString() + “\n”);


            if (item.TryGetProperty(rmsInternalProp, out isInternalProp) && isInternalProp != null)


                rtItemProps.AppendText(“IsInternal: “ + isInternalProp.ToString() + “\n”);




Posted in Exchange development, Microsoft .net | Tagged: , , | 5 Comments »

Retrieving user SID using DirectoryEntry and DirectorySearcher

Posted by Torben M. Philippsen on December 7, 2010

Recently I was working on one of main projects that amongst other things retrieves some user properties from Active Directory.

In order to use Exchange 2007 Webservices I needed to retrieve the SID because the SID was needed when impersonating a given user. This articke describes how to retrieve the SID into a byte array and using P/Invoke.

Step 1 – Search the AD

    1 public SearchResultCollection getUserInfo(string ldapPath)

    2         {

    3             string ADUserName = ConfigurationManager.AppSettings[“UserName”];

    4             string ADPassword = ConfigurationManager.AppSettings[“Password”];

    5             DirectoryEntry rootEntry = new DirectoryEntry(ldapPath, ADUserName, ADPassword);

    6             DirectorySearcher searcher = new DirectorySearcher(rootEntry);

    7             //add the properties to retrieve

    8             //accountstatus

    9             searcher.PropertiesToLoad.Add(“userAccountControl”);

   10             //mail

   11             searcher.PropertiesToLoad.Add(“mail”);

   12             searcher.PropertiesToLoad.Add(“accountExpires”);

   13             searcher.PropertiesToLoad.Add(“proxyaddresses”);

   14             searcher.PropertiesToLoad.Add(“SAMAccountName”);

   15             searcher.PropertiesToLoad.Add(“objectSid”);

   16             SearchResultCollection results;

   17             results = searcher.FindAll();

   18             return results;

   19         }


Step 2 – loop the SearchResultCollection retriveing the “objectSid”

    string sidStringValue=””;

    foreach (SearchResult result in src)


                  //reset SID

                  byte[] SID = null;

                  if (result.Properties[“objectSid”].Count > 0)


                      SID = (byte[]) result.Properties[“objectSid”][0];


                  sidStringValue = GetSidString(SID); 

             }//end foreach

Step 3 – In the code example above a call to the method “GetSidString” is made – this method looks like this:

        [DllImport(“advapi32”, CharSet = CharSet.Auto, SetLastError = true)]

        static extern bool ConvertSidToStringSid([MarshalAs(UnmanagedType.LPArray)] byte[] pSID, out IntPtr ptrSid);


        public static string GetSidString(byte[] sid)


            IntPtr ptrSid;

            string sidString;

            if (!ConvertSidToStringSid(sid, out ptrSid))

                throw new System.ComponentModel.Win32Exception();



                sidString = Marshal.PtrToStringAuto(ptrSid);






            return sidString;



Posted in Exchange development | Tagged: , , , | 1 Comment »

Retrieve SID from domain user

Posted by Torben M. Philippsen on December 3, 2010

I do a lot of Exchange development and integrations. Doing that I often need to use a specific users SID. From the Exchange Management Console the SID can’t be retrieved easily. I have found a tool, that makes the task of fetching a user SID very easy. It is called GetSid  and you can download it from here:

Posted in Exchange development | Tagged: , , | Comments Off on Retrieve SID from domain user

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