Exception while trying to render "ComponentPresentationList" pushed as a package variable "MainSectionComponents"

Question

I have pushed a package variable of type "ComponentPresentationList" with name "MainSectionComponents". I have written razor template code to render the componentpresentation list.

   @foreach (var cp in Package.MainSectionComponents) {
     @cp.RenderComponentPresentation()
    }

When I try to run it in template builder I get following exception.

DynamicItemFields: Key 'rendercomponentpresentation' Not Found In ItemFields Cannot perform runtime binding on a null reference at CallSite.Target(Closure , CallSite , Object ) at System.Dynamic.UpdateDelegates.UpdateAndExecute1[T0,TRet](CallSite site, T0 arg0) at CallSite.Target(Closure , CallSite , Object ) at System.Dynamic.UpdateDelegates.UpdateAndExecute1[T0,TRet](CallSite site, T0 arg0) at Tridion.Extensions.Mediators.Razor.Templating.Rzr881cef20770a4632b97928a77eaf9c6dTemplate.Execute() at Tridion.Extensions.Mediators.Razor.RazorHandler.CompileAndExecute(DateTime revisionDate, Engine engine, Package package) at Tridion.Extensions.Mediators.Razor.RazorMediator.Transform(Engine engine, Template template, Package package) at Tridion.ContentManager.Templating.Engine.ExecuteTemplate(Template template, Package package) at Tridion.ContentManager.Templating.Engine.InvokeTemplate(Package package, TemplateInvocation templateInvocation, Template template) at Tridion.ContentManager.Templating.Compound.CompoundTemplateMediator.Transform(Engine engine, Template templateToTransform, Package package) at Tridion.ContentManager.Templating.Engine.ExecuteTemplate(Template template, Package package) at Tridion.ContentManager.Templating.Engine.InvokeTemplate(Package package, TemplateInvocation templateInvocation, Template template) at Tridion.ContentManager.Templating.Engine.TransformPackage(Template template, Package package) at Tridion.ContentManager.Templating.Debugging.DebuggingEngine.Run() at Tridion.ContentManager.Templating.Debugging.DebugSession.Run()

Can somebody please guide me in the right direction ?

Answer 1

Problem was that the package variable "MainSectionComponents" was pushed in as "ContentType.ComponentArray" instead of "ContentType.ComponentPresentationArray".This was giving following "DynamicItemFields: Key 'rendercomponentpresentation' Not Found In ItemFields" exception.

Answer 2

I think you should first check if item "MainSectionComponents" exists in the package and is not null.

Also, I am not sure, ComponentPresentation class supports method RenderComponentPresentation(). So if @cp.RenderComponentPresentation() dosn't work, you can try using TridionHelper.Engine.RenderComponentPresentation(cp.Component, cp.ComponentTemplate); inside the foreach loop.