BootstrapRowControl

using EPiServer;
using EPiServer.Core;
using EPiServer.Editor;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web;
using System.Web.UI.WebControls;

namespace Nergard.WebControls
{
    /// <summary>
    /// WebControl to manage creation of bootstrap rows. All childcontrols which are not of type EPiServer Property is removed. All EPiServer innerproperties are checked for null.
    /// If no children of type Property or if all innerproperty values is null the row isn't rendered.
    /// </summary>
    public class BootstrapRowControl : Panel
    {
        protected override void OnInit(EventArgs e)
        {
            //Empty contentareas must be visible in edit mode.
            if (PageEditing.PageIsInEditMode) return;

            PageData contentPage = null;

            for (int x = this.Controls.Count - 1; x >= 0; x--)
            {
                var control = this.Controls[x] as EPiServer.Web.WebControls.Property;

                if (control != null)
                {
                    if (control.PageLink != null && control.PageLink != PageReference.EmptyReference && !string.IsNullOrEmpty(control.PageLink.ToString()))
                    contentPage = DataFactory.Instance.GetPage(control.PageLink);
                    else if (!string.IsNullOrEmpty(control.PageLinkProperty) && CurrentPage[control.PageLinkProperty] != null)
                    contentPage = DataFactory.Instance.GetPage(new PageReference(CurrentPage[control.PageLinkProperty].ToString()));
                    else
                    contentPage = CurrentPage;

                    if (contentPage == null || contentPage[((EPiServer.Web.WebControls.Property)control).PropertyName] == null)
                    this.Controls.RemoveAt(x);
                }
                else
                this.Controls.RemoveAt(x);
            }

            if (this.Controls.Count == 0)
            this.Visible = false;
        }

        /// <summary>
        /// Currentpage from HttpContext
        /// </summary>
        private static PageData CurrentPage
        {
            get
            {
                var page = HttpContext.Current.Handler as EPiServer.PageBase;

                if (page == null)
                {
                    return null;
                }

                return page.CurrentPage;
            }
        }
    }
}