Attempt by method 'Glass.Mapper.Sc.Utilities.get_IsPageEditor()' to access method 'Sitecore.Context+PageMode.get_IsPageEditor()' failed

Question

Just updated a simple instance of Sitecore 8.1 to 8.2, the actual solution contains a simple demo, some templates, items, nothing too complex. All went fine as I followed all the steps from the upgrade document but now when I try to get into Sitecore I get the following:

Attempt by method 'Glass.Mapper.Sc.Utilities.get_IsPageEditor()' to access method 'Sitecore.Context+PageMode.get_IsPageEditor()' failed.

Is there a fix for this error somewhere? from the details below it seems to be from Glass and not Sitecore or my code.

EDIT:

After I removed all Glass packages from packages folder, removed entries from packages.config, removed all configs and then reinstalled a clean version of Glass.Mapper.SC and Glass.Mapper.Sc.MVC-5 via nuget on my solution now I get:

Could not resolve type name: Glass.Mapper.Sc.Pipelines.Response.GetModelFromView, Glass.Mapper.Sc.Mvc (method: Sitecore.Configuration.DefaultFactory.CreateFromTypeName(XmlNode configNode, String[] parameters, Boolean assert)).

I checked with dotPeek and indeed there isn't such method, but not sure why then there is this entry in Glass config:

<mvc.getModel>
        <processor patch:before="*[@type='Sitecore.Mvc.Pipelines.Response.GetModel.GetFromItem, Sitecore.Mvc']"  type="Glass.Mapper.Sc.Pipelines.Response.GetModel, Glass.Mapper.Sc.Mvc"/>
        <processor patch:before="*[@type='Sitecore.Mvc.Pipelines.Response.GetModel.GetFromItem, Sitecore.Mvc']"  type="Glass.Mapper.Sc.Pipelines.Response.GetModelFromView, Glass.Mapper.Sc.Mvc"/>
</mvc.getModel>

Then if I remove this again from config I get another error:

Method not found: 'Glass.Mapper.Sc.SitecoreContext Glass.Mapper.Sc.SitecoreContext.GetFromHttpContext(System.String)'.

Did anyone managed to have Glass working on a Sitecore 8.2 solution? I am not sure what else can I do to make it work fine.

My package entries:

 <package id="Glass.Mapper.Sc" version="4.2.1.188" targetFramework="net452" />
  <package id="Glass.Mapper.Sc.Core" version="4.2.1.188" targetFramework="net452" />
  <package id="Glass.Mapper.Sc.Mvc-5" version="3.3.1.48" targetFramework="net452" />

Glass.Mapper.Sc.Mvc.config:

<sitecore>
  <settings></settings>
  <pipelines>
    <mvc.getModel>
      <processor type="Glass.Mapper.Sc.Pipelines.Response.GetModel, Glass.Mapper.Sc.Mvc" />
    </mvc.getModel>
  </pipelines>
</sitecore>

Glass.Mapper.Sc.config:

<sitecore>
  <settings></settings>
  <pipelines>
    <mvc.getModel>
      <processor patch:before="*[@type='Sitecore.Mvc.Pipelines.Response.GetModel.GetFromItem, Sitecore.Mvc']"  type="Glass.Mapper.Sc.Pipelines.Response.GetModel, Glass.Mapper.Sc.Mvc" />
      <processor patch:before="*[@type='Sitecore.Mvc.Pipelines.Response.GetModel.GetFromItem, Sitecore.Mvc']"  type="Glass.Mapper.Sc.Pipelines.Response.GetModelFromView, Glass.Mapper.Sc.Mvc" />
    </mvc.getModel>
    <getChromeData>
      <processor type="Glass.Mapper.Sc.Pipelines.GetChromeData.EditFrameBuilder, Glass.Mapper.Sc" patch:before="processor[1]" />
    </getChromeData>
  </pipelines>
  <events>
    <event name="publish:end">
      <handler type="Glass.Mapper.Sc.Events.PublishEnd.GlassCacheClear, Glass.Mapper.Sc" method="ClearCache" />
    </event>
    <event name="publish:end:remote">
      <handler type="Glass.Mapper.Sc.Events.PublishEnd.GlassCacheClear, Glass.Mapper.Sc" method="ClearCache" />
    </event>
  </events>
</sitecore>

Answer 1

I'm not sure if you're updating Glass Mapper at the same time, but I don't believe the Glass.Mapper.Sc.Mvc-5 package is required as of v4 (Apr 2015).

If you have a look at the v4 release notes they have simplified things down to one Nuget package: Glass.Mapper.Sc, which also includes the .Mvc dll that you require. If your Nuget package install doesn't add it automatically, you can find it at <your project>\packages\Glass.Mapper.Sc.Core.4.2.1.188\lib\Mvc5x\Glass.Mapper.Sc.Mvc.dll (where Mvc5x is the version of MVC you are using).

I have Glass Mapper working in 8.2, however when I installed the .Mvc-5 Nuget package you mentioned, I can replicate your Could not resolve type name: Glass.Mapper.Sc.Pipelines.Response.GetModelFromView issue.

If you can't get your project running without this .Mvc-5 Nuget package (you should be able to) let us know what appears to be missing / broken.

Answer 2

You need to use latest version of glass mapper: https://www.nuget.org/packages/Glass.Mapper.Sc/4.2.1.188 with Sitecore 8.2

In the new version you have:

 namespace Glass.Mapper.Sc
 {
   public class Utilities : Glass.Mapper.Utilities
   {
       public static bool IsPageEditor
       {
           get
           {
              return Sitecore.Context.PageMode.IsExperienceEditor;
           }
       }
    }
}

Sitecore.Context.PageMode.IsExperienceEditor.IsPageEditor is private now, and it was changed with Sitecore.Context.PageMode.IsExperienceEditor.IsExperienceEditor.

Answer 3

The above answers didn't help me here. When I reflected out IsPageEditor for 4.2.188 it still used IsPageEditor not IsExperienceEditor. Looking at the source code it seems to depend on how the assembly is built:

public class Utilities : Mapper.Utilities
{

    public static bool IsPageEditor
    {
        get
        {
#if SC82
            return Sitecore.Context.PageMode.IsExperienceEditor;
#else
            return Sitecore.Context.PageMode.IsPageEditor;
#endif
        }
    }
    public static bool IsPageEditorEditing
    {
        get
        {
#if SC82
            return Sitecore.Context.PageMode.IsExperienceEditorEditing;
#else
            return Sitecore.Context.PageMode.IsPageEditorEditing;
#endif
        }
    }
...

It's unclear from the NuGet package what version each build is for. When I upgraded from 4.2.188 to 4.2.189 the assembly contained the correct version. Making my think that this is built for SC 8.2 as opposed to 8.1. Bascially it looks like a build mistake to me.