Umbraco ContentLastChanceFinder for 404 pages

LastChance404Finder

using System;
using System.Globalization;
using System.Linq;
using umbraco.cms.businesslogic.web;
using Umbraco.Core;
using Umbraco.Web;
using Umbraco.Web.Routing;

/// <summary>
/// Summary description for NotFoundHandler
/// </summary>
public class NotFoundHandler : ApplicationEventHandler
{
    protected override void ApplicationStarting(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext)
    {
        ContentLastChanceFinderResolver.Current.SetFinder(new My404ContentFinder());
    }
}

public class My404ContentFinder : IContentFinder
{
    public bool TryFindContent(PublishedContentRequest contentRequest)
    {
        if (!contentRequest.HasDomain)
            return false;
        var contentCache = contentRequest.RoutingContext.UmbracoContext.ContentCache;
        var domainRoot = contentCache.GetById(contentRequest.Domain.RootNodeId);
        var firstSegment = contentRequest.Uri.AbsolutePath.Split(new[] { '/' }, StringSplitOptions.RemoveEmptyEntries).First();
        var root = domainRoot.Children.FirstOrDefault(x => x.UrlName == firstSegment);
        root = root ?? domainRoot.Children.First();
        var page = root.Descendants().FirstOrDefault(x => x.DocumentTypeAlias == "404");
        if (page == null) return false;
        contentRequest.PublishedContent = page;
        var wcd = Domain.GetDomainsById(root.Id, true).SingleOrDefault(x => x.IsWildcard);
        if (wcd != null) contentRequest.Culture = new CultureInfo(wcd.Language.CultureAlias);
        return true;
    }
}