Parameters

A parameter is a report variable that is set by the user and instantiated when the report is refreshed. There are many types of parameters, and programmatically setting different types can result in different behaviors and experiences for users of your application.

Best practices for working with parameters

To avoid runtime errors when setting parameters programmatically, note the following:

• Parameter values must be of the same type as the parameter.
• If the parameter has an edit mask, the values for the parameter should respect the mask.
• When reading parameter values, ensure that you know what type of values you are reading, that is, whether they are discrete or ranged.
• Set the bound type on a range value before adding it to the parameter.
• Ensure that the upper bound of a range value is larger than the lower bound.

Classes used when working with parameters

• CrystalDecisions.ReportAppServer.Controllers.ParameterFieldController

Adds, removes, and modifies parameter fields in a report.

• CrystalDecisions.ReportAppServer.DataDefModel.ParameterField

Represents a parameter field in a report.

In this section:

• Properties of parameter values
• Setting dynamic cascading parameters
• To add a parameter field to a report
• To modify a parameter field
• To set the value of a discrete parameter

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