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In ActiveReports, you can use an expression to set the value of a control in the report, or set conditions under which certain styles apply. You can set Microsoft Visual Basic® .NET in expressions through,

All expressions begin with an equal sign (=). Even the expression for a field value for a TextBox is set as follows:

Expression Editor Dialog

You can build expressions quickly using the Expression Editor dialog. This dialog allows you to choose from a number of fields available to the report as well as to a particular property. You can access the Expression Editor by selecting nearly any property of a control and choosing <Expression...> from the drop-down list.

There are seven types of fields available in the Expression Editor:

To create an Expression in the Expression Editor

Using Expressions in Reports

In the raw form, your data may not be ideally suited for display in a report. You can customize it and bring it into shape using expressions. Following are some examples of how expressions are set in different scenarios.

Concatenating Fields and Strings

Conditional Formatting


Displaying Expressions at Design Time

As you design the report, the full text of an expression can get very long. ActiveReports makes expressions easier to read by shortening them.

When an expression is in the form:

On the design surface, you see this text inside that TextBox:

Double-click the TextBox to view the full expression in edit mode.

For aggregates too, when the Expression value is:

On the design surface, you see this text inside the TextBox:

This shortened expression value is only a visual change to allow you to see the field name easily. It shows up in both the TextBox on the design surface as well as any dropdown boxes inside the dialogs. 

Note: You can type the format as listed above for either field name values or aggregates on field names. This evaluates the full expression when the report is viewed.

Besides the shorthand for field names, you can also type shorthand like [@Param] for parameters and [&Value] for Globals such as [&PageNumber] on the design surface. Please note that you cannot use shorthand in the Expression Editor.

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