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If you’re a fan of using the web services included with SharePoint to access some of it’s functionality, you will often times feel they lack in providing some basic access to the SharePoint object model. One such instance is when dealing with Lists and their permissions. Out of the box, we can manipulate a SharePoint list at the container level, but what if we want to get more granular and manipulate permissions for specific List items? Well, we can build our own web service to help us (and we can even deploy it)!

We will need to manipulate/view a List and it’s associated items in three ways. First, we need to be able to view all of the permissions that are already associated with a given item. Then we will want to add or delete permissions from our mystery list item.

Getting the permissions for a list item:

SPSite Site = new SPSite(sSitePath);
SPWeb Web = Site.OpenWeb();
SPList List = Web.Lists[sListName];
SPListItem ListItem = List.Items.GetItemById(iItemID);

foreach (SPRoleAssignment spRole in ListItem.RoleAssignments)
{
     foreach (SPRoleDefinition roledef in spRole.RoleDefinitionBindings)
     {
          //custom code here
     }
}

Web.Close();
Site.Close();

Adding permissions to a list item:

SPSite Site = new SPSite(sSitePath);
SPWeb Web = Site.OpenWeb();
SPList List = Web.Lists[sListName];
SPListItem ListItem = List.Items.GetItemById(iItemID);

SPUser user = Web.AllUsers[sUserName];

SPRoleAssignment RoleAss = new SPRoleAssignment(user.LoginName, user.Email, user.Name, user.Notes);

SPRoleDefinition RoleDef = Web.RoleDefinitions.GetByType((SPRoleType)rtNew);

RoleAss.RoleDefinitionBindings.Add(RoleDef);

if (!ListItem.HasUniqueRoleAssignments)
     ListItem.BreakRoleInheritance(true);

Web.AllowUnsafeUpdates = true;
Site.AllowUnsafeUpdates = true;

ListItem.RoleAssignments.Add(RoleAss);
ListItem.Update();

Web.AllowUnsafeUpdates = false;
Site.AllowUnsafeUpdates = false;

Web.Close();
Site.Close();

Removing permissions from a list item:

SPSite Site = new SPSite(sSitePath);
SPWeb Web = Site.OpenWeb();
SPList List = Web.Lists[sListName];
SPListItem ListItem = List.Items.GetItemById(iItemID);
SPUser user = Web.AllUsers[sUserName];

if (!ListItem.HasUniqueRoleAssignments)
     ListItem.BreakRoleInheritance(true);

Web.AllowUnsafeUpdates = true;
Site.AllowUnsafeUpdates = true;

ListItem.RoleAssignments.Remove(user);
ListItem.Update();

Web.AllowUnsafeUpdates = false;
Site.AllowUnsafeUpdates = false;

Web.Close();
Site.Close();

There you have it. Role assignments and List items made easy.