I've tried that. It didn't work.

EDIT: Forgot to mention, that I am running 7.2.8

I was going to suggest the same thing as Tim. The InGroupsOf is an extension method within the "Umbraco.Core" namespace, so it's weird that the error is being thrown.

I'm wondering if it work with any other IEnumerable<T>?

e.g. var groups = Enumerable.Range(1, 10).InGroupsOf(2);

See what happens then?

Cheers,
- Lee

That works!

var groups = Enumerable.Range(1, 10).InGroupsOf(2);
foreach(var demo in groups){
    <br>
    foreach(var test in demo){
        @test
    }
}

This is my Stack Trace for the example in the first post of this thread:

[RuntimeBinderException: 'System.Collections.Generic.List<Umbraco.Core.Models.IPublishedContent>' does not contain a definition for 'InGroupsOf']
   CallSite.Target(Closure , CallSite , Object , Int32 ) +232
   System.Dynamic.UpdateDelegates.UpdateAndExecute2(CallSite site, T0 arg0, T1 arg1) +991
   ASP._Page_Views_Partials_Footer_cshtml.Execute() in e:\dynamicweb.net\oerskovweb.dk\Views\Partials\Footer.cshtml:60
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +280
   System.Web.Mvc.WebViewPage.ExecutePageHierarchy() +125
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +196
   Umbraco.Core.Profiling.ProfilingView.Render(ViewContext viewContext, TextWriter writer) +140
   System.Web.Mvc.Html.PartialExtensions.Partial(HtmlHelper htmlHelper, String partialViewName, Object model, ViewDataDictionary viewData) +147
   ASP._Page_Views_Master_cshtml.Execute() in e:\dynamicweb.net\oerskovweb.dk\Views\Master.cshtml:53
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +280
   System.Web.Mvc.WebViewPage.ExecutePageHierarchy() +125
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +196
   System.Web.WebPages.WebPageBase.RenderSurrounding(String partialViewName, Action`1 body) +208
   System.Web.WebPages.WebPageBase.PopContext() +195
   Umbraco.Core.Profiling.ProfilingView.Render(ViewContext viewContext, TextWriter writer) +140
   System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context) +380
   System.Web.Mvc.<>c__DisplayClass1a.<InvokeActionResultWithFilters>b__17() +33
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation) +613
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation) +613
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult) +263
   System.Web.Mvc.Async.<>c__DisplayClass25.<BeginInvokeAction>b__22(IAsyncResult asyncResult) +240
   System.Web.Mvc.<>c__DisplayClass1d.<BeginExecuteCore>b__18(IAsyncResult asyncResult) +28
   System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +15
   System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +53
   System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +15
   System.Web.Mvc.<>c__DisplayClass8.<BeginProcessRequest>b__3(IAsyncResult asyncResult) +42
   System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +15
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +606
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +288

Hi Søren,

Hmmm, it's a bit confusing why InGroupsOf would work for the number range, but not for the node list.

Does the loop work if you remove the InGroupsOf(2) call from it?

foreach(var logos in CurrentPage.Site().GetPropertyValue<IEnumerable<IPublishedContent>>("footerlogo")

Does that throw an error?

After that, I'm not sure what else I can suggest :-(

Thanks,
- Lee

Hi Lee

Yes, that would work. This:

@foreach(var logos in CurrentPage.Site().GetPropertyValue<IEnumerable<IPublishedContent>>("footerlogo")){
    @logos<br>
}

Would return this:

Our.Umbraco.NestedContent.Models.DetachedPublishedContent
Our.Umbraco.NestedContent.Models.DetachedPublishedContent
Our.Umbraco.NestedContent.Models.DetachedPublishedContent
Our.Umbraco.NestedContent.Models.DetachedPublishedContent

Hmmm, I'm still confused about the "'System.Collections.Generic.List<Umbraco.Core.Models.IPublishedContent>' does not contain a definition for 'InGroupsOf'" error.

As the node should apply to any IEnumerable<T> extension method.

I'm wondering what would happen if you tried this...

var groups = Enumerable.Range(1, 10).ToList().InGroupsOf(2);

...

Feels like I'm clutching at straws now though :-(

Cheers,
- Lee

var groups = Enumerable.Range(1, 10).ToList().InGroupsOf(2);

This would return the same as your first suggestion.

If apply this to my code, I get the following error:

'System.Collections.Generic.List<Umbraco.Core.Models.IPublishedContent>' does not contain a definition for 'ToList'

That did the trick!

Thank you Lee!

LOL! Love the gif!

I still find it weird that the extension method didn't work (from your first code snippet), but glad that we eventually got there! :-)

Cheers,
- Lee