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To view the complete list of changes, see the [release notes feed](🔗).

Some changes are binary breaking but do not necessarily require code changes but rather just a recompilation of the project. Breaking changes are changes in method signatures or behavior of methods compared to the documented API in the previous version, which are described in this document.


[System Requirements](🔗) have changed for CMS 9. Windows Server 2008/2008 R2 and Windows 7 are no longer supported due to missing websocket support.

  • [Removal of EPiServer.Logging.Log4Net dependency](🔗)

  • [Additional parameter in Log method of ILogger interface](🔗)

  • [Windows Workflow Foundation 3.5 (WF)](🔗)

  • [Virtual Path Providers (Unified File System)](🔗)

  • [ASP.NET 2.0 Web Services](🔗)

  • [CMS 5 Framework](🔗)

  • [Page Objects](🔗)

  • [Page Providers](🔗)

  • [Dynamic Properties](🔗)

  • [DataFactory](🔗)

  • [XForms](🔗)

  • [PropertyLongString, IPropertyLoadDataHandler and delayed value loadin](🔗)

  • [DotNetZip dependency and EPiServer.Shell.Web.Hosting.ZipFileVirtualPathProvider removed from EPiServer.CMS.UI.Core](🔗)

  • [EPiServer.CMS.UI zip files were renamed](🔗)

  • [StructureMap updated to new major version ( or later)](🔗)

  • [ShellContext was removed](🔗)

  • [Mirroring](🔗)

  • [URL Rewrite Provider](🔗)

  • [WebForms: Custom property controls in web.config](🔗)

## Removal of EPiServer.Logging.Log4Net dependency

**Who/what is affected:**

Sites using log4net for logging may have to re-install the **EPiServer.Logging.Log4net** package.


**EPiServer.CMS.Core** no longer has a dependency on EPiServer.Logging.Log4Net. This breaking change lets you run on the latest version of Log4Net or use another provider. See [Logging](🔗).

Because of this change, the NuGet package, EPiServer.Logging.Log4Net, may be removed by NuGet when you upgrade to CMS 9. You need to manually ensure that the package is installed by inspecting **packages.config**. You also may get the following error, which indicates EPiServer.Logging.Log4Net was uninstalled:

_System.TypeLoadException: Method 'Log' in type 'Log4NetLogger' from assembly 'EPiServer.Logging.Log4Net, Version=, Culture=neutral, PublicKeyToken=8fe83dea738b45b7' does not have an implementation._

Install the EPiServer.Logging.Log4Net package to get a supported version (version 1.1 or higher).


EPiServer.Logging.Log4Net 1.1.0 uses the old log4net 1.2.10 which is the last version using the old signature, EPiServer.Logging.Log4Net 2.0.0 uses new versions of log4net. [See log4net home page for details](🔗).

## Additional parameter in Log method of ILogger interface

**Who/what is affected:**

Custom logging frameworks implementing the [EPiServer.Logging.ILogger interface](🔗) to provide custom logging functionality.


An additional parameter representing the logger framework boundary type was added to the Log method of the ILogger interface. This is required by the Log4Net implementation to correctly resolve the logging location when using logging extension methods and can be useful for other logging frameworks for the same reasons. If you have implemented your own custom Logger implementation, you can add the new argument to your implementation and ignore the passed value.

## Windows Workflow Foundation 3.5 (WF)

**Who/what is affected:**

Sites using Windows Workflow Foundation for content approval.


As previously announced, Episerver removed [its implementation of WF](🔗) (Windows Workflow Foundation), where WF 3 that Episerver was using is now obsoleted by Microsoft and (officially) not supported on Azure.

You must manually delete **EPiServer.Implementation.dll**, **EPiServer.BaseLibrary.dll** and **EPiServer.WorkflowFoundation.dll** from the _bin_ folder because they are blocking the initialization process. NuGet will not automatically remove these.

Episerver is investing in a new projects feature that supports rich collaboration on pages and also blocks, media, and catalog content. Even though the new project feature is still in Beta, the released features are well-tested. The [user guide](🔗) describes the project feature from an end-user perspective up until update 79; newer features are described in the release feed.

## Virtual Path Providers (Unified File System)

**Who/what is affected:**

Sites using legacy/obsolete API's.


Removes remains of the VPP system that was made obsolete in CMS 7.5, and mostly incorporates the [EPiServer.Web.Hosting](🔗) namespace in **EPiServer.dll**, but because this system was very much integrated into all parts of the system, there also are small breaking changes in other classes. For example, Permanent Links had both content and file links. They are now unified to permanent content links.


VPP as a concept is not removed, but it is no longer used for content as of 7.5. See [Migrating VPP-based files to the new media system](🔗).

**SearchService** and **SearchPageController** classes in Alloy MVC 7.5 still had code referencing the Unified File System, even though all media was migrated, you can remove this code. To get help with fixing these classes, create a new site from the Visual Studio extension and compare the classes.

## ASP.NET 2.0 Web Services

**Who/what is affected:**

Sites using any of the ASP.NET 2.0 Web Services (ASMX).


Removes Content Channel and the other ASP.NET 2 Web Services that were last shipped in 7.5 and [officially obsolete in 8](🔗).

## CMS 5 Framework

**Who/what is affected:**

Sites using **ObjectStore** or other undocumented API's.


Removes assemblies **EPiServer.BaseLibrary.dll** and **EPiServer.Implementation.dll**. The changes are source code-compatible (unless you are using an undocumented or obsoleted API). These assemblies were the framework of CMS 5 and contained internal features such as the ObjectStore. There are a few classes still used in there that are being moved to **EPiServer.dll**.

## Page Objects

**Who/what is affected:**

Sites using the obsolete API.


A feature that pre-dated blocks. [Obsolete in 7.5.](🔗)

## Page Providers

**Who/what is affected:**

Sites using the obsolete API (**PageProviderBase**/**PageProviderCapabilities**).


The API was made obsolete since EPiServer 7.0 and is now removed. It was replaced by [Content Providers](🔗).

Also affect sites based on the CMS 7.5 Alloy templates that used the **PageProviderCapabilities enum**, replace usage with **ContentProviderCapabilities**.

## Dynamic Properties

**Who/what is affected:**

Sites using dynamic properties.


[As officially announced in 7.5](🔗), this feature does not support the new user interface introduced in CMS 7. When you upgrade, this feature is disabled, both in the user interface and any API access to properties. To re-enable dynamic properties, add configuration **operationCompatibility="DynamicProperties"** on the **applicationSettings** element.

## DataFactory

**Who/what is affected:**

Sites that have code that creates new instances of **DataFactory** (new **DataFactory()**).


There was a default constructor on DataFactory but you should not create new instances of DataFactory because it bypasses the **IoC** container. This causes problems with events and caching, but the constructors were left for compatibility with older unit tests. The constructors are now made obsolete; use [DataFactory.Instance](🔗) or [IContentRepository](🔗) instead when working with DataFactory.

## XForms

**Who/what is affected:**

If you have code that uses the **EPiServer.BaseLibrary.Channels** namespace .


The interfaces IChannel/IItem etc. that were part of EPiServer.BaseLibrary and were only used by XForms are moved into XForms under the **EPiServer.XForms.Channels** namespace. The API is intact so it should be enough to change namespace and recompile.

## PropertyLongString, IPropertyLoadDataHandler and delayed value loadin

**Who/what is affected:**

If you are relying on the implementation of **IPropertyLoadDataHandler** in **PropertyLongString**.


The delayed value loading support in PropertyLongString was revised and it no longer implements IPropertyLoadDataHandler. The IPropertyLoadDataHandler interface is still supported but deprecated and will be removed in a future release.

A few related quirks in PropertyLongString were addressed, correcting issues with **Clear** and **IsNull** not behaving as expected when the value loading was delayed. The **ParseToSelf** method also was corrected to raise **IsNull** and **IsModified** correctly when passed a null string.

## DotNetZip dependency and EPiServer.Shell.Web.Hosting.ZipFileVirtualPathProvider removed from EPiServer.CMS.UI.Core

### Who/what is affected:

If you are using **EPiServer.Shell.Web.Hosting.ZipFileVirtualPathProvider**.

### Description

EPiServer.CMS.UI.Core no longer has a dependency to **DotNetZip** and EPiServer.Shell.Web.Hosting.ZipFileVirtualPathProvider was removed.

If you were using the EPiServer.Shell.Web.Hosting.ZipFileVirtualPathProvider in your code, you should change it to use **EPiServer.Web.Hosting.ZipArchiveVirtualPathProvider** or have a look in the **Zip Compressed Content** section in [Developing Add-ons](🔗).

## EPiServer.CMS.UI zip files were renamed

### Who/what is affected

The **EPiServer.Shell.UI.zip** archive was renamed to **Shell.zip**. The **EPiserver.CMS.Shell.UI.zip** archive was renamed to **CMS.zip**.

## StructureMap updated to new major version ( or later)

**Who/what is affected:**

Anyone using **StructureMap** or registering items in Episerver's StructureMap Container.


The StructureMap dependency was updated to the latest major version. The changes in the Episerver Library are minimal, but there are some major changes to the StructureMap API that may affect any usage. See the [StructureMap release notes](🔗) for further details. Episerver Framework 9.0.0 requires the signed version of StructureMap (packages structuremap-signed and structuremap.web-signed). Depending on version of NuGet you installed, the old version of StructureMap ( may have to be manually uninstalled.

For example, components that are compiled against StructureMap 2 and uses the ASP.NET extensions **HttpContextScoped** must be re-compiled. The following example exception is seen when the components are not re-compiled against CMS 9:

_System.MissingMethodException: Method not found: 'StructureMap.Configuration.DSL.Expressions.CreatePluginFamilyExpression\`1\<!!0> StructureMap.Configuration.DSL.Registry.For()'._

To support multiple versions of CMS, use the [ServiceConfiguration attribute](🔗) instead of manually calling into StructureMap.

## ShellContext was removed

**Who/what is affected:**

Any code that references the **EPiServer.Shell.ShellContext** class.


The EPiServer.Shell.ShellContext class was removed because the last useful property was removed after being made obsolete in previous versions.

## Mirroring

**Who/what is affected:**

Anyone using mirroring.


Mirroring shipped with CMS 7.5 is no longer compatible with CMS 9. An updated DLL is available in the **EPiServer.CMS.Core** NuGet package (example _packages/EPiServer.CMS.Core.9.0.0/tools/MirroringService/_). You need to manually update the DLL in any mirroring installation after upgrading to CMS 9.

## URL Rewrite Provider

**Who/what is affected:**

Anyone using URL Rewrite providers.


The **episerver/urlRewrite** configuration will be removed, if configured. Classes related to URL rewriting are made obsolete and point to the [routing extensibility options](🔗).

The URL Rewrite provider system was replaced with ASP.NET Routing already in CMS 7 but was officially obsoleted in CMS 8 when classic links were removed and it was no longer possible to render a template with direct links.

## WebForms: Custom property controls in web.config

**Who/what is affected:**

Sites configuring custom property controls by using the **\<episerver.baseLibrary>** section in the **web.config** file.


The episerver.baseLibrary section in the web.config file is removed on upgrade. Custom property controls now can be registered only in code by using **PropertyControlClassFactory.Instance.RegisterClass**.