Visiblity Provider for MVCSiteMapProvider 4.0

MyCompanySiteMapVisibilityProvider.cs

namespace MyCompany.Web
{
    public class MyCompanySiteMapVisibilityProvider : MvcSiteMapProvider.SiteMapNodeVisibilityProviderBase
    {
        public override bool IsVisible(ISiteMapNode node, IDictionary<string, object> sourceMetadata)
        {
            if (node == null)
            {
                return true;
            }

            // Is a visibility attribute specified?
            var visibilityValue = node.Attributes.GetValue("visibility");
            if (visibilityValue != null)
            {
                bool nodeVisible;
                string visibility = visibilityValue.ToString();

                if (bool.TryParse(visibility, out nodeVisible))
                {
                    return nodeVisible;
                }
            }
            return true;
        }
    }
}