R – How to find which object in ASP.NET can’t be serialized

asp.netasp.net-mvcnetserializationsession

I'm getting the following error in my application:

Unable to serialize the session state.
In 'StateServer' and 'SQLServer' mode,
ASP.NET will serialize the session
state objects, and as a result
non-serializable objects or
MarshalByRef objects are not
permitted. The same restriction
applies if similar serialization is
done by the custom session state store
in 'Custom' mode.

The stack trace isn't providing any good information on which object is not able to serialize. Is there a good way to find the problem child?

Edit:
I've found the issue, I was trying to serialize a Linq statement(not executed). But I'll try an choose an answer that would have best solved this issue.

Best Answer

Really, you should mainly be storing your own state data / objects (ideally modelled as DTO classes), in which case the answer is: any you mark as [Serializable] or ISerializable. You shouldn't be adding raw UI controls or other unknown objects to session-state. In particular, for reasons like this, which had a major performance impact on an app the other day.

Related Solutions

C# – Session state serialization

Since we don't have the rest of your code, we can't tell what part of that class is a problem. But you can tell.

Comment out half of that class and try again. If it works, then the half you commented out had the problem in it. If it doesn't work, then the half you did not comment out has the problem in it. Either way, comment out half of the part with the problem in it and try again...

This is just like a Binary Search.

Javascript – How to display a JavaScript object

Use native JSON.stringify method. Works with nested objects and all major browsers support this method.

str = JSON.stringify(obj);
str = JSON.stringify(obj, null, 4); // (Optional) beautiful indented output.
console.log(str); // Logs output to dev tools console.
alert(str); // Displays output using window.alert()

Link to Mozilla API Reference and other examples.

obj = JSON.parse(str); // Reverses above operation (Just in case if needed.)

Use a custom JSON.stringify replacer if you encounter this Javascript error

"Uncaught TypeError: Converting circular structure to JSON"

Best Answer

Related Solutions

C# – Session state serialization

Javascript – How to display a JavaScript object

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