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https://issues.apache.org/jira/browse/CB-519?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13255043#comment-13255043
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Alan Neveu commented on CB-519:
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I am also seeing a lot of this error while my code is just looping through
fileEntries:
A first chance exception of type 'System.InvalidCastException' occurred in
System.ServiceModel.Web.dll
I think there is some automatic attempts at JSON conversions taking place and
some of my files are not JSON and so this error is being thrown. Looks like a
similar thing is happening in another here in Jira I was just reading.
> FileReader.readAsText performs automatic JSON.parse
> ---------------------------------------------------
>
> Key: CB-519
> URL: https://issues.apache.org/jira/browse/CB-519
> Project: Apache Callback
> Issue Type: Bug
> Components: WP7
> Affects Versions: 1.6.1
> Environment: VS.NET 2010 and WP7.1 emulator
> Reporter: Alan Neveu
> Assignee: Jesse MacFadyen
> Priority: Minor
>
> After upgrading from 1.5 I find that FileReader.readAsText takes the liberty
> of performing a JSON.parse if my file happens to be a stringified JSON
> object. While this seems like a nice addition, my app connects to an ASP.NET
> web service which uses Microsoft's serialization objects to serve the JSON to
> my app. Because of this I have had to roll my own JSON parse and stringify
> functions to deal with Microsoft's version of date serialization. I am able
> to work with the automatic JSON.parse by checking for typeof == "object" and
> if that is what FileReader.readAsText has returned then I go ahead and use my
> own JSON.stringify and JSON.parse and go along on my way. But I thought it
> was odd that this automatic JSON.parse would happen in the first place, so I
> submit this as a bug in case someone was doing some testing/debugging and
> accidentally left a line of code in place that should really not be there. I
> can live with it if it is intentional, but I think it would be more intuitive
> to not do automatic JSON operations that the function name does not indicate.
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