Hi!

The support asked me to post a question here to check if anyone else experienced the same problem. I have been working on converting PageProviders to ContentProviders in an upgrade of a site from 6 R2 to 7.19. 

The aim of the provider is to mirror content (pages) from one site to another (Holmen to Iggesund). The sites share the same code base and EPiServer-instance. The mirrored pages should be of a different pagetype than the original pages. I have looked at the implementation of the Youtube provider so the code should be quite similar to that: https://github.com/episerver/YouTubeContentProvider. I have gotten so far so that everything works like a charm in edit mode, but for some reason the routing is not working on the site. When browsing to the respective pages I first got a 404. I added an override of the method ListMatchingSegments(). As far as I can see that method now returns the correct content, but instead of the page being displayed I get a 301 redirect loop: 

When I browse to http://localhost/en/Global/Press-Startpage/Mirrored-News-from-Holmen/holmen-and-sustainability

I get the response:

Object moved to here.

"holmen-and-sustainability" is the name of the page in this case (which I would like to use as routing segment). "?id=21__newsip&epslanguage=en" is added to the redirect url and I suspect that the ContentProvider once again tries to resolve the content after the redirect and the loop is a fact.

I also tried regestering a partial router, but that code doesn't trigger when I have the ListMatchingSegments() method in the ContentProvider.

Grateful for any help!

/Sebbe

Here is the ContentProvider:

using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Configuration;
using System.Linq;
using System.Web.Caching;
using System.Xml.Linq;
using EPiServer;
using EPiServer.Core;
using Holmen.Externweb.Common;
using EPiServer.DataAbstraction;
using Holmen.Externweb.Web.Templates.Public.PageTypes;
using Holmen.Externweb.Web.Templates.Public.Classes.ScheduledJobs;
using EPiServer.Security;
using EPiServer.ServiceLocation;
using EPiServer.Construction;
using EPiServer.DataAccess;
using EPiServer.Web.Routing;
using EPiServer.Web;
using System.Globalization;


namespace Holmen.Externweb.Web.Templates.Public.Classes.ContentProviders
{

/**
* This replicates Holmen Group news marked for display on Iggesund
*/
//TODO Epi7 man kan ärva från IVersion för att hantera publiseringsinfo. 
public class NewsForIggesundProvider : EPiServer.Core.ContentProvider
{

private const string languageBranch = "en";
private const string backingPagePropertyName = "HolmenNewsPage";

private readonly IdentityMappingService _identityMappingService;

private ContentType ContentType
{
get { return ContentTypeRepository.Load(typeof(EpiPageTypes.Iggesund.Article.IggesundArticleColumnsFromHolmenNews)); }
}

public NewsForIggesundProvider(IdentityMappingService identityMappingService)
{
_identityMappingService = identityMappingService;
}

/// 

/// Initializes the provider from configuration settings.
/// 
/// The key.
/// The config params.
public override void Initialize(string key, NameValueCollection configParams)
{
//Let base classes do their initialization
base.Initialize(key, configParams);
}

protected override IContent LoadContent(ContentReference contentLink, ILanguageSelector languageSelector)
{
MappedIdentity mappedIdentity = _identityMappingService.Get(contentLink);

string holmenNewsId = mappedIdentity.ExternalIdentifier.Segments[1];
int holmenNewsIdInt;
var success = int.TryParse(holmenNewsId, out holmenNewsIdInt);
if (success)
{
var reference = new PageReference(holmenNewsIdInt);
PageData page = DataFactory.Instance.GetPage(reference);

var iggesundArticle = ConvertToIggesundArticle(mappedIdentity, page);

return iggesundArticle;
}
return null;
}



protected override IList LoadChildrenReferencesAndTypes(ContentReference contentLink, string languageID, out bool languageSpecific)
{
languageSpecific = false;

if (contentLink == this.EntryPoint)
{
PageReference pr = Holmen.Externweb.Web.EpiPageTypes.HolmenGroup.HolmenGroupSettings.Instance.NewsRootPage;

if (!PageReference.IsNullOrEmpty(pr))
{
System.Collections.Generic.IList list = new List();

var pages = pr.GetChildren().OfType().Where(x => x.ShowOnIggesund); //.Where(x => x.Categories.IsEmpty);
foreach (EpiPageTypes.HolmenGroup.Press.NewsItem page in pages)
{
Uri externalID = MappedIdentity.ConstructExternalIdentifier(ProviderKey, page.ContentLink.ToString());
var mappedIdentity = _identityMappingService.Get(externalID, true);

System.Type modelType = null;

modelType = typeof(EpiPageTypes.Iggesund.Article.IggesundArticleColumnsFromHolmenNews);

GetChildrenReferenceResult result = new GetChildrenReferenceResult
{
ContentLink = mappedIdentity.ContentLink,
ModelType = modelType
};
list.Add(result); 
}
return list.Reverse().ToList();
}
}
return null;

}


protected override IList ListMatchingSegments(ContentReference parentLink, string urlSegment)
{
var list = new List();
foreach (var child in LoadChildren(parentLink, LanguageSelectorFactory.MasterLanguage(), -1, -1))
{
var routable = child as IRoutable;
var isMatch = routable != null && urlSegment.Equals(routable.RouteSegment, StringComparison.OrdinalIgnoreCase);

if (isMatch)
{
list.Add(new MatchingSegmentResult
{
ContentLink = child.ContentLink
});
}
}
return list;
}



public IContent ConvertToIggesundArticle(MappedIdentity mappedIdentity, PageData original)
{
ContentType type = ContentTypeRepository.Load(typeof(EpiPageTypes.Iggesund.Article.IggesundArticleColumnsFromHolmenNews));


var mirrored = ContentFactory.CreateContent(type);

mirrored.ContentTypeID = type.ID;

mirrored.ParentLink = new PageReference(EntryPoint.ID);

mirrored.ContentLink = mappedIdentity.ContentLink;
mirrored.ContentGuid = mappedIdentity.ContentGuid;

mirrored.Property[backingPagePropertyName].Value = original.ContentLink;

mirrored.Name = original.Name;

ILocalizable localizable = mirrored as ILocalizable;
var cult = new CultureInfo(languageBranch);
localizable.Language = cult;

(mirrored as EpiPageTypes.Iggesund.Article.IggesundArticleColumnsFromHolmenNews).LinkType = PageShortcutType.Normal;
(mirrored as EpiPageTypes.Iggesund.Article.IggesundArticleColumnsFromHolmenNews).Property["PageShortcutLink"].Value = original.ContentLink;

(mirrored as IRoutable).RouteSegment = UrlSegment.GetUrlFriendlySegment(mirrored.Name);

var securable = mirrored as IContentSecurable;
securable.GetContentSecurityDescriptor().AddEntry(new AccessControlEntry(EveryoneRole.RoleName, AccessLevel.Read));

var versionable = mirrored as IVersionable;
if (versionable != null)
{
versionable.Status = VersionStatus.Published;
}

var changeTrackable = mirrored as IChangeTrackable;
if (changeTrackable != null)
{
changeTrackable.Changed = original.Changed;
}

return mirrored;
}
}
}