itemgetvalue header value cannot be null

Bert Hoorne 15 posts 55 karma points

Jun 28, 2015 @ 06:25

Item.GetValue("header") Value cannot be null.

Hi,

I created a custom header, with only 1 property, a single textstring. Every time I try to show the values, I get the error: : Value cannot be null.

HTML:

@inherits UmbracoViewPage<Lecoati.LeBlender.Extension.Models.LeBlenderModel>
@foreach (var item in Model.Items)
{
    <div class="row">
        <div class="col-sm-6 col-sm-offset-3">
            <h2 class="module-title font-alt">@item.GetValue("Header")</h2>
        </div>
    </div>
}

The stacktrace:

   at System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal)
   at System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info)
   at System.Int32.Parse(String s)
   at Lecoati.LeBlender.Extension.Helper.GetTargetContentType()
   at Lecoati.LeBlender.Extension.Models.LeBlenderPropertyModel.GetValue[T]()
   at Lecoati.LeBlender.Extension.Models.LeBlenderValue.GetValue[T](String propertyAlias)
   at Lecoati.LeBlender.Extension.Models.LeBlenderValue.GetValue(String propertyAlias)
   at ASP._Page_views_partials_grid_editors_ModuleTitel_cshtml.Execute() in c:\Projects\keystroke\Rovasac website\Web solution\Source\Rovasac\Views\Partials\Grid\Editors\ModuleTitel.cshtml:line 6
   at System.Web.WebPages.WebPageBase.ExecutePageHierarchy()
   at System.Web.Mvc.WebViewPage.ExecutePageHierarchy()
   at System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage)
   at System.Web.Mvc.RazorView.RenderView(ViewContext viewContext, TextWriter writer, Object instance)
   at System.Web.Mvc.BuildManagerCompiledView.Render(ViewContext viewContext, TextWriter writer)
   at Umbraco.Core.Profiling.ProfilingView.Render(ViewContext viewContext, TextWriter writer)
   at System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context)
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResult(ControllerContext controllerContext, ActionResult actionResult)
   at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass1a.<InvokeActionResultWithFilters>b__17()
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation)

The backend enter image description here

The wierd thing is, it is only on some document types, not on all of them.

Any ideas?

Thanks :)

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Alex Skrypnyk 6182 posts 24283 karma points MVP 8x admin c-trib

Jun 29, 2015 @ 22:07

Hi Bert,

Can you use 'HasValue()' method for checking value before using it ?

Thanks

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Bert Hoorne 15 posts 55 karma points

Jul 01, 2015 @ 18:04

Hi Alex,

My object does not have a property HasValue, enter image description here

Is it correct that I inherit from :

@inherits UmbracoViewPage<Lecoati.LeBlender.Extension.Models.LeBlenderModel>

Thanks!

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Antoine 176 posts 1494 karma points

Jul 01, 2015 @ 18:28

Hi Bert,

I think that it because the alias of your property is header and not Header, the alias is camel case.

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Bert Hoorne 15 posts 55 karma points

Jul 01, 2015 @ 19:15

Hi, I tried this too, but still same issue :(

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Antoine 176 posts 1494 karma points

Jul 02, 2015 @ 17:33

Hi Bert,

I tried it with exactly the same values but it works fine for me :/

Have you got any more info about your issue, some error within the console? you have this error in front or back?

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Bert Hoorne 15 posts 55 karma points

Jul 14, 2015 @ 19:54

Hi,

I downloaded the source code and found that this is null:

string.IsNullOrEmpty(HttpContext.Current.Request["id"]

located in

     internal static PublishedContentType GetTargetContentType()

The possible reason is because I am using a custom controller and the Id is not set.

In my controller I added the ID to HttpContext.Current.Items collection and wrote some extra code in Leblender Extension to retreive this id

 else if (!string.IsNullOrEmpty(HttpContext.Current.Request["id"]))
        {
            int contenId = int.Parse(HttpContext.Current.Request["id"]);
            return (PublishedContentType)ApplicationContext.Current.ApplicationCache.RuntimeCache.GetCacheItem(
                "LeBlender_GetTargetContentType_" + contenId,
                () =>
                {
                    var services = ApplicationContext.Current.Services;
                    var contentType = PublishedContentType.Get(PublishedItemType.Content, services.ContentService.GetById(contenId).ContentType.Alias);
                    return contentType;
                });
        }
        else
        {
            int contenId = int.Parse(HttpContext.Current.Items["id"].ToString());
            return (PublishedContentType)ApplicationContext.Current.ApplicationCache.RuntimeCache.GetCacheItem(
                "LeBlender_GetTargetContentType_" + contenId,
                () =>
                {
                    var services = ApplicationContext.Current.Services;
                    var contentType = PublishedContentType.Get(PublishedItemType.Content, services.ContentService.GetById(contenId).ContentType.Alias);
                    return contentType;
                });
        }

Does anyone knows why this ID is null? And who sets it?

Thanks :)

(it works with my changes for now)

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Item.GetValue("header") Value cannot be null.