How to Bind Distribution List to Sharepoint Peoplepicker

I guess most of you aware of  how to use Sharepoint PeoplePicler control in your sharepoint solutions.If not here is a perfect blog http://karinebosch.wordpress.com/sharepoint-controls/peopleeditor-control/ i found while i was struggling. As it says we can bind either, User, SPGroup or SPSecurityGroup. But the real game starts when you are an amateur to Sharepoint and so badly wanted to bind a DL to Peoplepicker and use. So here is the way i came across.

Senario:

Add a DL using PeoplePicker and store it in a List. Then later get the users of the DL  (Eg: mail address etc.)

Solution:

First add the following Line to the Picker control. Note the Selection set.

<sharepoint:PeopleEditor ID="PeopleEditor2" runat="server" AllowEmpty="true" MultiSelect="true"
 SelectionSet="User,DL" CssClass="event-invite-ppl" />

Then add the following Code to determine whether it is a ‘User’ or a ‘DL’.

StringBuilder groupNames = new StringBuilder(string.Empty);
for (int i = 0; i < PeopleEditor2.Entities.Count; i++)
{
 PickerEntity pe = (PickerEntity)PeopleEditor2.Entities[i];
 if (pe.EntityType == "DL")
{
 groupNames.Append(pe.DisplayText);
 groupNames.Append(";");

}
 else if (pe.EntityType == "User")
  {
   SPFieldUserValue inviteetoadd = new SPFieldUserValue(oSPWeb, oSPWeb.EnsureUser(pe.Key).ID, pe.Key);
   inviteeListCollection.Add(inviteetoadd);
  }
}
newParticipantItem["InvitedGroupNames"] = groupNames.ToString();

Now have the Display Name of the DL. So we need to get the DL related to it and bind it to the PeoplePicker control.

if (participantListItem["InvitedGroupNames"] != null)
{
 string[] groupNames = participantListItem["InvitedGroupNames"].ToString().Split(';');
 groupNames = groupNames.Where(x => !string.IsNullOrEmpty(x)).ToArray();
 
foreach (string group in groupNames)
 {
   PickerEntity groupEntity = new PickerEntity();
   groupEntity.Key = GetADGroupName(groupName);
   entityArrayList.Add(groupEntity);
 }
}
 PeopleEditor2.UpdateEntities(entityArrayList);
 
---------------------------------------------------------------


string GetADGroupLoginName(string groupName)
 {
 string userNames = string.Empty;
 System.DirectoryServices.SearchResult result;
 DirectorySearcher search = new DirectorySearcher();
 search.Filter = String.Format("(cn={0})", groupName);
 result = search.FindOne();

 if (result != null)
 {
 userNames = result.Properties["samaccountname"][0].ToString();
 userNames = string.Format(@"<>\{0}", userNames);
 }
 return userNames;
 }

Using System.DirectoryService; //You will need to namespace 

If you need to get the names (Eg: Dayan Sameera) of the given DL users. Use the following method.

ArrayList GetADGroupUsers(string groupName)
 {
 System.DirectoryServices.SearchResult result;
 DirectorySearcher search = new DirectorySearcher();
 search.Filter = String.Format("(cn={0})", groupName);
 search.PropertiesToLoad.Add("member");
 result = search.FindOne();
 ArrayList userNames = new ArrayList();
 if (result != null)
 {
 for (int counter = 0; counter < result.Properties["member"].Count; counter++)
 {
 string user = (string)result.Properties["member"][counter]; 
 // here i needed to get only the name of the user,i used user.Substring();
 user = user.Substring(user.IndexOf("=") + 1, user.IndexOf(',') - 3);
 userNames.Add(user);
 }
 }
 return userNames;
 }

Note: Why i used the ‘Dispayname’ of the DL  ? Can we add the DL directly as a SPGroup and store ?  Please read this  and this.

Thanks.

Good luck

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Understand SPSecurity.RunWithElevatedPrivileges

Here is a Nice and simply explained article I’ve found while I was digging the blogs and posts for finding a solution to remove a ListItem from a List using another one’s credentials.

http://blogs.msdn.com/b/sowmyancs/archive/2008/08/14/spsecurity-runwithelevatedprivileges-an-important-point-while-using-it-in-web-context.aspx

My Scenario

What i was faced was, i wanted to remove a row from the SPList using SPSecurity.RunWithElevatedPrivileges . My WebApplication was Claims Based, and i was able to perfectly remove an item from the list when i perform it using my own credentials. The problem occurred when another person tried to do the same operation using his credentials.

Here the problem was, whenever we take the SPWeb instance using  

SPWeb oWeb = SPContext.Current.Web;, then SPWeb instance still running under anonymous account only , because we are taking it through the current web context in which the current user is running under anonymous account (IUSR_MachineName). That was the reason that we got that “Access Denied” exception. We need to remember this point all time whenever we use RunWithElevatedPrivileges under the web context.

So what we need to that, we have to take the current context outside the SPSecurity.RunWithElevatedPrivileges block and then create a new instance of SPSite and SPWeb inside the that block which will run under application pool identity.

Solution Code:

 SPWeb oWeb1 = SPContext.Current.Web; // taking the current SPWeb context running under the anonymous account
            SPSecurity.RunWithElevatedPrivileges(delegate()
            {
                using (SPSite oSite = new SPSite(oWeb1.Site.Url))
                {
                    // creating a new SPSite running under Application pool idenity
                    using (SPWeb oWeb = oSite.OpenWeb())
                    {
                      // Code Lines you need 
                    }
                }
            });

Good luck..!!