How to read a parameter value in Sub reports

Question

Hi, 
 I have a custom report. It will get user input From and Todate to generate the report with in that dates. I used a parameters to get the date. 
 In the summery Page, i can able to refer the Parameter ( DateFrom and DateTo). If i refer the parameter variable in the sub reports ( Pending Attestation , Completed Attestation) , it return the default date value. It does not get the data entered by the user when generating the report. lt looks like the it is not the global value which can be used in sub reports. 
 I want to show the From and To data user entered in the Parameter when generating the Report in Sub Reports. 
 How can i achieve this. Can some one help me on this?

Markus Weiss-Ehlers · Answer

I looked at the report definition file you send me and you used drill-down of the report engine to open the sub-report defined on different pages in the same report using event code. 
 For drill-downs the report engine allows you to define additional drill-down parameters. You have to give them a name and define an expression. 
 In you case create parameters for datefrom and dateuntil and set the expression to the value of the dictionary variables DateFrom and DateUntil. 
 Your event code for defining the parameters should similar to the following (new lines highlighted, just one sample use case): 
 
 You can reference the DrillDownParameters in the sub-report using this["<Name>"]. In my sample this would be this["DateFromSub"]. 
 https://www.stimulsoft.com/en/documentation/online/user-manual/index.html?report_internals_interaction_drill-down_parameters.htm 
 https://www.stimulsoft.com/en/documentation/online/user-manual/index.html?getting_started_invoice_report_with_parameters.htm 
 HtH

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How to read a parameter value in Sub reports