ActiveReports 9
Subreport(RDL)
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The Subreport control is a placeholder for data from a separate report. In ActiveReports, we recommend that you use data regions instead of Subreport controls wherever possible for better performance. The reason is that the report server must process every instance of each subreport, which can become burdensome in very large reports with a large number of subreports processed many times per report. Using data regions to display separate groups of data can be much more efficient in such reports. For more information, see Work with Report Controls and Data Regions.

Note: The Subreport control is not supported in Page reports, only RDL. Also, you cannot use a Section report as the target of a Subreport in a RDL report, and vice versa. But you can export any type of report to RDF and use that as the target of a Subreport in a section report.

Subreports make sense when you need to nest groups of data from different data sources within a single data region, or when you can reuse a subreport in a number of reports. Here are some things to keep in mind while designing subreports.

Parameters

You can use parameters supplied by the parent report to filter data displayed in a subreport. You can also pass parameters to a repeating subreport nested in a data region to filter each instance.

Subreport Dialog

Properties for the Subreport are available in the Subreport dialog. To open it, with the Subreport control selected on the report, under the Properties Window, click the Property dialog link.

The Subreport dialog lets you set properties on the report control with the following pages.

Note: You can select <Expression...> within any of these properties to open the Expression Editor.

General

Visibility

Navigation

Parameters

Data Output

See Also

 

 


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