Programatically setting Site Collections Administrators in SharePoint 2010 using Client Object Model

Question

I am writing a program where I want to be able to add/remove user/groups as administrator for a given Site Collection. I am using Client Object Model API for SharePoint 2010. I havent been able to find any API which would allow me to do that. Is this something which is even possible via Client Object Model? If yes how ?

Answer 1

You can't do that with 2010 client object model but it is now possible with 2013.

For promoting a user to Site collection admin we need to:

• Set the IsSiteAdmin property to true.

Having said that you can't set the IsSiteAdmin property via 2010 client object model.

However, it is quite possible to do it via:

• Server side object model
• PowerShell

Answer 2

EDIT

just looked over the code and your right it doesnt work, I had a deep look at the webservices ootb provided by sharepoint and there is no function to perform the job!! so the next solution would be to make your own webservice that does it for you!

within the webservice add:

public bool SetSiteCollAdmin(string siteURL,string userAccount)
{ 
   using(SPSite site=new SPSite(siteURL)) 
   { 
      using (SPWeb web = site.RootWeb) 
      { 
          SPUser user = web.EnsureUser(userAccount); 
          user.IsSiteAdmin = true; 
          user.Update();
          return true;
      } 
   } 
   return false;
}

call that method with Ajax soap call.

to create a webservice follow:

http://msmvps.com/blogs/windsor/archive/2011/11/04/walkthrough-creating-a-custom-asp-net-asmx-web-service-in-sharepoint-2010.aspx