Parameter passing from master to subreport

Is it possible to pass a multi-value parameter from a master report to one or more subreports? If so, how?

Thanks for any help.

Wayne E. Pfeffer

Yes you can do this. I suggest the following: In your subreport make the report parameter a multi-value parameter. Test the subreport stand alone and make sure it works. Then drop the subreport into your main report, and map the subreport parameters to the main report parameters.

Scenario 1 (multi value parameter pass through):
The Main report has report parameter A which is a multi value parameter. You want to pass it to SubReport1 which has a report parameter B which is also defined as multi value parameter. In this case the mapping is just a simple parameter expression: =Parameters!A.Value
The subreport RDL element would look like this:
<Subreport Name="SubReport1">
...
<Parameters>
<Parameter Name="B">
<Value>=Parameters!A.Value</Value>
</Parameter>
</Parameters>
</Subreport>

Scenario 2:
The Main report has no report parameters. You have a SubReport1 with a report parameter B defined as multi value parameter. You want to pass e.g. three selected values "A", "B", "C" as parameter values to the subreport. You need to create a multidimensional object array on-the-fly, e.g. with the Split function, e.g.: =Split("A,B,C", ",")
RDL example:
<Subreport Name="SubReport1">
...
<Parameters>
<Parameter Name="B">
<Value>=Split("A,B,C", ",")</Value>
</Parameter>
</Parameters>
</Subreport>

Scenario 3:
The Main report has a multi-value parameter A. You want to pass only the first selected value from the main report's parameter to the subreport and the subreport's report parameter B is a single-value parameter. You can do this by using e.g. =Parameters!A.Value(0)
RDL example:
<Subreport Name="SubReport1">
...
<Parameters>
<Parameter Name="B">
<Value>=Parameters!A.Value(0)</Value>
</Parameter>
</Parameters>
</Subreport>

-- Robert

|||Thank you for the help, it worked out.

Wayne|||Is there a limit on how many parameters you can pass if you are using Scenario1. I have 5 parameters and 1 subreport. I can pass in the first 4 (A,B, C,D) and the report works fine but when I try to pass in the last one (E), which is no different than the previous 4 parameters other than it might have a few more values than the others, I get an error saying that one or more parameters need has not been specified.|||

There is no limit on the number of parameters.

Instead, it seems like the parameter values passed in violate constraints defined for the subreport parameters. For example, the subreport parameter's data type is integer and you pass string values. Or you pass a NULL value ('Nothing' in VB) as one of the parameter values - which is not allowed for multi value parameters, etc.

-- Robert

|||

Okay, I am sort of new to reporting services...where would I go to check the data type?..I don't believe anything is a null but where would I go to check that? The subreport works fine on its own...The master report will be/is populated by stored procedures so at first I thought something may be off with the stored procedures but all the other parameters work just fine when hooked up to the subreport's parameters. Currently, the subreport is running off of data from the cube however, it has been suggested that I change the subreport to pull from the same stored procedures as the master report and it will work fine...which I don't understand because again the first four parameters work fine with out using the stored procedures. Any further assistance would be greatly appreciated.

Thanks.