Event Receiver which tries to create a Prefix will throw Security Exception

Question

I'm trying to use an Event Receiver on a List to create a Managed Path with Wildcard-inclusion in the parent WebApplication. I tried to handle it with the following code (reduced to show the idea)

SPSecurity.RunWithElevatedPrivileges(
  () =>
  {
    using (var site = new SPSite(properties.SiteId))
    {
      var semester = new Semester(properties.ListItem);

      var webApplication = site.WebApplication;
      webApplication.Prefixes.Add(semester.UrlPart, SPPrefixType.WildcardInclusion);
      webApplication.Update(true);
    }
  });

If the code comes to Prefixes.Add it will throw a SecurityException. The SharepointWebSite-Account is far away from least privilege at the moment (DB-Sysadmin, Local Admin, Farm Admin), but it refuses to perform my task.

I just tried to accomplish my Task with powershell logged on as the user in question - and it works - so the user privileges seem not to be the Problem.

For clearification: it's an asynchronous on ItemAdded Event-Receiver.

I found something in the logs, but as i said from Powershell it works with that user:

08/24/2012 13:46:16.80 w3wp.exe (0x13EC) 0x12C8 SharePoint Foundation Topology 7f7y High Adding a new WildcardInclusion site prefix with the path SoSe to the web application MiscWebApp. efa9c69b-9634-90de-f417-1b3bf5bf9325

08/24/2012 13:46:16.80 w3wp.exe (0x13EC) 0x12C8 SharePoint Foundation Topology 8dyu High The SPPersistedObject, SPWebApplication Name=MiscWebApp, could not be updated because the current user is not a Farm Administrator. efa9c69b-9634-90de-f417-1b3bf5bf9325

Can anybody help?

Answer 1

Can you try it this way and let me know if it fixes the issue:

var site = SPContext.Current.Site; var currentWebApplication = SPContext.Current.Site.WebApplication; SPSecurity.RunWithElevatedPrivileges( () => { using (var elevatedSite = new SPSite(site.ID)) { var semester = new Semester(properties.ListItem); var webApplication = elevatedSite.WebApplication; webApplication.Prefixes.Add(semester.UrlPart, SPPrefixType.WildcardInclusion); webApplication.Update(true); } });

Answer 2

First thing comes to mind is have you put your dll in the gac?

also look at this as its similar issue:

http://stackoverflow.com/questions/8588675/sharepoint-event-receiver-not-working

EDIT

SPSecurity.RunWithElevatedPrivileges( 
  () => 
  { 
    using (var site = new SPSite(properties.SiteId)) 
    { 
      var semester = new Semester(properties.ListItem); 

      var webApplication = site.WebApplication; 

      webApplication.AllowUnsafeUpdates = true;

      webApplication.Prefixes.Add(semester.UrlPart, SPPrefixType.WildcardInclusion); 
      webApplication.Update(true); 

      webApplication.AllowUnsafeUpdates = false;
    } 
  }); 

Iv just added AllowUnsafeUpdates when your updating to see if it makes a difference!

hope it helps :)