Hi again Hugues,
The Grid does not have a specific event that is triggered when it is being filtered but the dataSource transport parameterMap function is triggered each time a request is being made so that the values can be converted to the needed format. The function is not exposed by the Kendo MVC DataSource because a default parameterMap function is used which converts the values in the format that is expected by the DataSourceRequestAttribute. It is possible to override the function via JavaScript after the Grid has been initialized as demonstrated in the snippet below:
An alternative is to get the filters and modify the values on the server from the DataSourceRequest before using the ToDataSourceResult method.
Regards,
Daniel
the Telerik team
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