Sharepoint breaking inheritance on list permissions to certain groups

Question

I have three lists namely X, Y and Z for which there are four different security groups called as A, B, C and D.All groups have full control to lists.My scenario is I need to break inheritance of all three lists and remove the groups C and D to have control over the lists. Security groups C and D should not have any kind of control to all the three lists.I am trying to create a feature event receiver to break inheritance .Help me out in this regards.Thanks.

Answer 1

You can use the below code,

SPSecurity.RunWithElevatedPrivileges(delegate()
            {
using (SPSite site = new SPSite(SPContext.Current.Site.ID))
                {
                    using (SPWeb web = site.OpenWeb())
                    {
                         web.AllowUnsafeUpdates = true;

                         SPGroup group = web.SiteGroups["GroupName"];

                         SPPrincipal principal = (SPPrincipal)group;

                         SPRoleAssignment rAssignment = new SPRoleAssignment(group);

                         SPList list = web.Lists["ListName"];

                         //The below function Breaks the role assignment inheritance for the list and gives the current list its own copy of the role assignments

                         list.BreakRoleInheritance(true);

                         list.RoleAssignments.Remove(principal);

                         //update the list, so that specific group assignment will have the access.

                         list.Update();

                         web.AllowUnsafeUpdates = false;
                    }
            }

 });

Hope this helps you.

Answer 2

Here is an example code:

SPGroup group = web.SiteGroups["C"];
SPRoleDefinition fullControlDef = web.RoleDefinitions["Full Control"];
SPRoleAssignment fullControlRole = new SPRoleAssignment(group);
fullControlRole.RoleDefinitionBindings.Add(fullControlDef);
if (!list.HasUniqueRoleAssignments) 
        list.BreakRoleInheritance(true);
var assignmentForGroup = list.RoleAssignments.GetAssignmentByPrincipal(group);
assignmentForGroup.RoleDefinitionBindings.Remove(fullControlDef);
assignmentForGroup.Update()