Hi Patrick,
Thanks for using Syncfusion components.
Currently, we don’t have support to use ReportParameter global collection directly in custom code. We have already logged feature request on this and it will be implemented in our upcoming releases. You can pass the joined value / label of a multi value parameter using Join expression (=Join(Parameters!MultiValueParam.Value,”,”) / =Join(Parameters!MultiValueParam.Label,”,”)) to the custom code method and process them inside code modules.
Regards,
Vinoth S.