SharePoint 2010: Show lync presence in custom webpart

My customer asked for a contact details webpart with the feature if the contact is available on Lync or not. It isn’t difficult to get the contact details from a user profile in contrast to get the lync presence. I spend a few hours to get how it works in SharePoint 2010 and finally I found this blog post of Martin Kearn. With a little bit of fine tuning I rewrote the function to let it work with the UserProfile property instead of a SPFieldUserValueCollection.

The code that do the thing:

Code Snippet

1. public static string GetPresenceHTMLFromUserProfile(UserProfile profile)
2.         {
3.             StringBuilder html = new StringBuilder("");
4.             
5.             string sipAddress = "";
6.             //Get the sip address if it exists
7.             if (profile[PropertyConstants.WorkEmail].Value != null)
8.             {
9.                 sipAddress = profile[PropertyConstants.WorkEmail].Value.ToString();
10.             }
11.  
12.             //construct the html for this user and add to overall html
13.             html.Append(String.Concat(
14.                 "<span><a href=\""
15.                 , Helper.GetUserProfileUrl(profile)
16.                 , "\" id=\"ProfileLink"
17.                 , sipAddress
18.                 , "\">"
19.                 , profile.DisplayName
20.                 , "</a>"
21.                 , "<img border=\"0\" height=\"12\" src=\"/_layouts/images/imnhdr.gif\" onload=\"IMNRC('"
22.                 , sipAddress
23.                 , "')\" ShowOfflinePawn=\"1\" style=\"padding-left: 5px;\" id=\"PresencePawn"
24.                 , sipAddress
25.                 , "\" alt=\"presence pawn for "
26.                 , sipAddress
27.                 , "\"/></span>"
28.             ));
29.             
30.             return html.ToString();
31.         }