ContentFinder for multilingual sites in Umbraco

MultilingualContentFinder.cs

using System;
using System.Globalization;
using System.Web;
using Umbraco.Web.Routing;
using Umbraco.Core;

public class MultilingualContentFinder : IContentFinder
{
    public bool TryFindContent(PublishedContentRequest contentRequest)
    {
        try
        {
            var path = contentRequest.Uri.GetAbsolutePathDecoded();
            var parts = path.Split(new[] { '/' }, System.StringSplitOptions.RemoveEmptyEntries);

            if (parts.Length == 0) // redirect if root based on User Language 
            {
                if (HttpContext.Current != null &&
                    HttpContext.Current.Request.UserLanguages != null &&
                    HttpContext.Current.Request.UserLanguages.Length > 0)
                {
                    foreach (var x in HttpContext.Current.Request.UserLanguages)
                    {
                        if (x.StartsWith("es"))
                        {
                            contentRequest.SetRedirect("/es");
                            break;
                        }
                        if (x.StartsWith("en"))
                        {
                            contentRequest.SetRedirect("/en");
                            break;
                        }
                    }
                }
                if (!contentRequest.IsRedirect)
                    contentRequest.SetRedirect("/en"); // default to /en
            }

            switch (parts[0])
            {
                case "en" :
                    contentRequest.Culture = new CultureInfo("en-US");
                    break;
                case "es":
                    contentRequest.Culture = new CultureInfo("es-US");
                    break;

                default:
                    return false; // if path doesn't start with 'en' or 'us', then not found
            }

            string route = "/" + (parts.Length > 1 ? String.Join("/", parts, 1, parts.Length - 1) : "");
            contentRequest.PublishedContent = contentRequest.RoutingContext.UmbracoContext.ContentCache.GetByRoute(route, true);
        }
        catch (Exception ex)
        {
            Umbraco.Core.Logging.LogHelper.Error<MultilingualContentFinder>("MultilingualContentFinder exception", ex);
        }

        return contentRequest.PublishedContent != null;
    }
}

RegisterEvents.cs

using Umbraco.Core;
using Umbraco.Web.Routing;

public class RegisterEvents : ApplicationEventHandler
{
    protected override void ApplicationStarting(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext)
    {
        ContentFinderResolver.Current.Clear();
        ContentFinderResolver.Current.InsertType<ContentFinderByNotFoundHandlers>();
        ContentFinderResolver.Current.InsertTypeBefore<ContentFinderByNotFoundHandlers, MultilingualContentFinder>();
    }
}

Thanks for this, Alex. It was super useful for me :)

hey Alex, I'm using this as well. Do you have a way that i can exclude the Umbraco preview? I can't seems to get it to work with the preview button (it's showing 404)