In a
previous post I’ve shown you how to create a simple report with Rapid. In this
post I'll show you how to add filtering capabilities.
NRapid
provides a couple of ways to do this, in this case I’m going to use the nested
dialog approach. As far as I see it, it’s the easiest way to go.
The report
that we are about to build, should show products in a certain price range, to
do that we need to provide a dialog where the user can introduce the lowest and
the highest price and use that info as input parameters to filter the result
set.
As I
mentioned before, we are going to use the nested dialog approach, so our report
class should include a nested class like this:
The report
engine will inspect the report class at runtime and if it’s sees a nested class
called dialog, it will assume that this is the class that must use to create an
input parameters view. The data collected in this view will passed as a
parameter to the ConfigureReport method, inside that method we can get them and
use it to build the query that we are going to use to populate the report.
When we
execute the report, the first thing that we’re going to see is an input dialog
and once we confirm that dialog, the report should be be populated and shown.
In the next
post I'll going to show how easy is to add the input parameters into the report
output.
You can get the source code of NRapid from here
And the sample app from here
The Northwind database is available from download at http://www.microsoft.com/en-us/download/details.aspx?id=23654
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