Hi Luc, not sure if this helps - there's a CMS gadget built by David Knipe that shows editors the visitor group usages for a page or block.

It's for v11 but have a look at the code to find a content item's visitor groups. 

https://www.david-tec.com/2017/12/visitor-group-usage-viewer-for-episerver-11/

https://github.com/davidknipe/VisitorGroupUsage/blob/master/VisitorGroupUsage/Impl/VisitorGroupUsageImpl.cs

Hopefully will give you some direction for what you need.

Thanks Ronil, Not quite what i was looking for, David-tec code is analyzing ContentAreas which visitor group is used where. Thanks anyway.

Anyone else, can i intercept some visitor group validator maybe?

Hi Luc.

It looks like you should be able to get a list of the visitor groups applied to a block from the "Context.Items" collection in the block's view like this:

var visitorGroups = Context.Items["EPi:VisitorGroupRoleMatch:"] as Dictionary<string, bool>;

For a given block, that gives the name of the applied visitor group and whether it's a match.

Yes, found it.

Luc, be aware that there is a diff in key names:

• "EPi:VisitorGroupRoleMatch:" - for anonymous
• "EPi:VisitorGroupRoleMatch:" + {principal.Identity.Name} - for authenticated users

Is it showing "EveryOne sees" too?

Just looking at the value in Context.Items again, I think that value would be set per request rather than per block so it would contain a list of all of the visitor groups used on the current page and whether the current user is a member of that group. If that's all you need then great, but if you need to know, at a block level, which visitor groups are applied to that block, I think you'll need to add that data yourself earlier in the process. If you're rendering content areas using Html Helpers (e.g. Html.PropertyFor()) you could create your own ContentAreaRenderer which overrides the RenderContentAreaItem method to get the visitor group restrictions applied to the current item and pass them through to the view, something like this:

public class CustomContentAreaRenderer(IVisitorGroupRepository _vgRepo) : ContentAreaRenderer
{
    protected override void RenderContentAreaItem(IHtmlHelper htmlHelper, ContentAreaItem contentAreaItem, string templateTag, string htmlTag, string cssClass)
    {
        //Get the allowed roles for the block and return any that are valid GUIDs
        var visitorGroupGuids = contentAreaItem.AllowedRoles?.Select(x => Guid.TryParse(x, out var vgid) ? vgid : Guid.Empty).Where(x => x != Guid.Empty);

        //Get the visitor group corresponding to each GUID from the IVisitorGroupRepository instance
        var visitorGroups = visitorGroupGuids.Select(_vgRepo.Load);

        //Add the list of visitor groups to the view bag to pass into the view
        htmlHelper.ViewBag.VisitorGroups = visitorGroups;

        //Render as usual
        base.RenderContentAreaItem(htmlHelper, contentAreaItem, templateTag, htmlTag, cssClass);
    }
}

Actually yes, this might work :)

Might be cool addition to AdvancedContentArea addon..

Will see, worth squeezing in.

actually runing this piece of code in the view... if it is used, the pair.value is true. So far so good. 

BUT! when you are anonymous, and a block is shown with a visitor group, i see no "EPi:VisitorGroupRoleMatch:"  in the list, somethings weird.

@{
    // Define a local function within Razor syntax
    Func<System.Collections.IDictionary, string, string> FindAndJoin = (table, keyPrefix) =>
    {
        foreach (DictionaryEntry entry in table)
        {
            if (entry.Key.ToString().StartsWith(keyPrefix) && entry.Value is Dictionary<string, bool> dictionary)
            {
                System.Text.StringBuilder sb = new System.Text.StringBuilder();
                foreach (var pair in dictionary)
                {
                    if (pair.Value)
                    sb.AppendLine($"Used visitorgroup: {pair.Key} : {pair.Value}");
                }
                return sb.ToString();
            }
        }
        return "No matching key found or value is not a Dictionary.";
    };

}

@FindAndJoin(Request.RequestContext.HttpContext.Items, "EPi:VisitorGroupRoleMatch:")