Input string was not in a correct format Exception

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9/15/2012 9:01:59 AM
wloeffler
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Input string was not in a correct format Exception

Hi Joe,

Seeing the below exception thrown when accessing a site using a Win 8 RTM / IE10 client. Have also seen it using 08R2 but far less frequently.

2012-09-15 06:25:41,927 ERROR - /FormWizard/FormEdit.aspx?mid=116&pageid=54 - mojoPortal.Web.mojoBasePage - /FormWizard/FormEdit.aspx?mid=116&pageid=54
System.FormatException: 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.Web.UI.WebControls.ImageButton.LoadPostData(String postDataKey, NameValueCollection postCollection)
   at System.Web.UI.WebControls.ImageButton.System.Web.UI.IPostBackDataHandler.LoadPostData(String postDataKey, NameValueCollection postCollection)
   at System.Web.UI.Page.ProcessPostData(NameValueCollection postData, Boolean fBeforeLoad)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

The exception surfaces in several administrative areas but is very common in the Pro add-ins. Here is a solid repro that has been reproduced on the demo site: 1) Visit a page with Form Wizard Pro using IE 10, 2) Edit the form, 3) Clicking the pencil icon on a question will cause the exception.

Note when IE10 is in compatibility mode the exception does not occur but the layout is not as expected.

The environment is MP 2.3.9.0 / MSSQL 2008R2 / .NET 4.0 Full Trust. Client: Windows 8 RTM / IE 10

 

9/15/2012 9:45:26 AM
Joe Audette
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Re: Input string was not in a correct format Exception

Hi Bill,

This error is only pointing to .net framework code not to actual code in Form Wizard or mojoPortal.

I don't currently have any Win 8 machines or access to IE 10 but I do not think it is a bug in mojoPortal or in Form Wizard application code, the error points to deeper stuff in the framework not to my code, so it seems like a bug that is an issue with IE 10 and .NET 4 compatibility.

A quick google of IE 10 and the error stack trace finds this article which says a workaround is to install .NET 4.5 on your server. There is also a thread about this error on asp.net forums. .NET 4.5 is a superset of .NET 4 so you can safely run the mojoPortal .NET 4 package under .NET 4.5 as I understand it.

Hope that helps,

Joe

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