empty multinodepicker cause error loading script input string not in correct format - Razor

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Harald Ulriksen 207 posts 249 karma points

May 24, 2011 @ 22:46

Empty MultiNodePicker cause Error Loading Script - input string not in correct format

I have a page with a multinodepicker, the problem is that just accessing the property for this picker cause a rather nasty exception if it's empty (i.e. the user has not selected any nodes).

var maybeDynamicXml = node.selectedMedia;

Any tips on how I can get around this?

Error Loading Razor Script (file: Categories 
List) Input string was not in a correct format.    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.Linq.Enumerable.WhereSelectArrayIterator`2.MoveNext()
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   at umbraco.MacroEngines.DynamicNode.ConvertPropertyValueByDataType(Object& result, String name, Guid dataType)
   at umbraco.MacroEngines.DynamicNode.TryGetMember(GetMemberBinder binder, Object& result)
   at CallSite.Target(Closure , CallSite , Object )
   at 
ASP._Page_macroScripts_CategoriesList_cshtml.<>c__DisplayClass7.<productImage>b__6(TextWriter
 __razor_helper_writer) in 
c:\sourcecode\B-Sessions\bid\umbraco\macroScripts\CategoriesList.cshtml:line
 14
   at System.Web.WebPages.WebPageBase.Write(HelperResult result)
   at ASP._Page_macroScripts_CategoriesList_cshtml.Execute() in 
c:\sourcecode\B-Sessions\bid\umbraco\macroScripts\CategoriesList.cshtml:line
 32
   at System.Web.WebPages.WebPageBase.ExecutePageHierarchy()
   at System.Web.WebPages.WebPage.ExecutePageHierarchy()
   at 
System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext 
pageContext, TextWriter writer, WebPageRenderingBase startPage)
   at umbraco.MacroEngines.RazorMacroEngine.ExecuteRazor(MacroModel macro, INode currentPage)
   at umbraco.MacroEngines.RazorMacroEngine.Execute(MacroModel macro, INode currentPage)

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Harald Ulriksen 207 posts 249 karma points

May 24, 2011 @ 22:59

0

Solved by checking the GetProperty method before accessing the property directly. This error may be related to the document beeing created by the api, not the UI.

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Sebastiaan Janssen 5060 posts 15522 karma points MVP admin hq

May 24, 2011 @ 23:03

Try:

@if(Model.SelectedMedia.GetType() != typeof(DynamicNull) && !string.IsNullOrWhitespace(Model.SelectedMedia)) {
    var maybeDynamicXml = Model.SelectedMedia;
    //Do something with it...
}

This will improve in 4.7.1 by the way, with a better HasValue method.

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