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Crash in GridSettingsPersister class

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Steve Barak asked on 11 Mar 2011, 04:08 PM

Crash.JPG

Hi

I our project we are using Class GridSettingsPersister in the link(http://www.telerik.com/help/aspnet/grid/grdsavingsettingsonperuserbasis.html). Previously when we are Telerik.Web.UI version 2009.2.701.20 it was working fine. We upgrade Telerik.Web.UI version ()it is crashing in some page at Dim gridSettings() As Object = CType(formatter.Deserialize(reader), Object()).

When we connected development database it is crashing.while it is test in testing database there was no issue.

Its value of parameter ‘setting’ passed to LoadSettings() function

Development Database :

/wEUKwAFFgQeAl9jAgEeATAWBB4DX2ZuBRFXb3JrZmxvd0RhdGVfdGVtcB4DX3NvCyl1VGVsZXJpay5XZWIuVUkuR3JpZFNvcnRPcmRlciwgVGVsZXJpay5XZWIuVUksIFZlcnNpb249MjAwOS4yLjcwMS4yMCwgQ3VsdHVyZT1uZXV0cmFsLCBQdWJsaWNLZXlUb2tlbj0xMjFmYWU3ODE2NWJhM2Q0AhQrAAAUKhJTeXN0ZW0uV2ViLlVJLlBhaXIIDwIDHA8CBBwPAgUbAAAAAAAAKEAHAAAADwIGGwAAAAAAAERABwAAAA8CBxsAAAAAAAA2QAcAAAAPAggbAAAAAAAAGEAHAAAADwIJGwAAAAAAACRABwAAAA8CChsAAAAAAAAkQAcAAAAWCGhoZ2dnZ2doAgo=

Testing Database

/wEUKwAFFgQeAl9jAgEeATAWAh4DX2ZuBRFXb3JrZmxvd0RhdGVfdGVtcBQrAAAUKhJTeXN0ZW0uV2ViLlVJLlBhaXIIDwIDHA8CBBwPAgUbAAAAAAAAKEAHAAAADwIGGwAAAAAAAERABwAAAA8CBxsAAAAAAAA2QAcAAAAPAggbAAAAAAAAGEAHAAAADwIJGwAAAAAAACRABwAAAA8CChsAAAAAAAAkQAcAAAAWCGhoZ2dnZ2doAhQ=

We try this solution Set the MaxPageStateFieldLength proprety of Pages in Web.config file

but still issue existing .

The error message while debugging is 'The serialized data is invalid' but browser show another runtime error message. Please check the screen shot.

5 Answers, 1 is accepted

answered on 14 Mar 2011, 04:31 PM

Hi Steve,

The current implementation of the GridSettingsPersister does not support deserializing data that is serialized from a previous version of the assembly in which the GridSettingsPersister is defined. The problem is in the binary serialization, in particular. In the RadGrid Persisting Grid Settings on a Per-User Basis demo, you can note the GridSettingsCollection class implemented in the GridSettingsPersister.cs source code file. Objects of that class are the data that is actually getting serialized and deserialized. The LosFormatter that is used to serialize and deserialize this object uses binary serialization internally. Under default settings, binary serialization uses the full assembly name when identifying the full name of the class to which the serialized/deserialized object belongs. When you rebuild your project (or the assembly in which the GridSettingsCollection class is defined), the full name of the class (that includes also the assembly version) may change. At this point binary serialization will fail, expecting to find an assembly matching the same name and version as the assembly which the original object was serialized from.

This issue is a limitation (or requirement) of binary serialization in particular. It is not directly related to the GridSettingsPersister, which is centered around extracting persisted settings from a RadGrid instance. The GridSettingsPersister behavior won't change if you implement another means of serializing and deserializing your saved grid settings (an object of type GridSettingsCollection). In this respect, serialization is detached from the persister behavior. It is easily customizable by providing your own implementation for the methods of the GridSettingsCollection class and you can implement your own serialization mechanism based on your needs (if binary serialization may not be suitable for your case).

In fact, binary serialization can work for you, if you choose to use the BinaryFormatter (instead of the LosFormatter provided by default) and set the AssemblyFormat property to Simple. With this setting, assembly names of serialized and deserialized objects are not required to match exactly and you will not get the exception you are getting. The only requirement for this option is for your application to run in full trust. Medium trust environments do not allow binary serialization with simple assembly resolution and you cannot use this approach in shared hosting environments.

Veli
the Telerik team

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answered on 07 Jul 2016, 06:35 PM

Hi,

I have a similar issue where I have a project that was serialising settings for a RadGrid and saving them in a SQL database as a string.

I have since moved my project from a 'Web Site' to a 'Web Application' and also upgraded to use VB 14.

Now when I run the project the LosFormatter.Deserialize(settings_string) fails with the error "The serialized data is invalid".

I cannot change how the settings were formatted because they are all saved in the DB now and there are hundreds of entries.

Is there any way you can suggest to deserialize and use these old strings from the DB in the new WebApp project ?

Thanks.