DevExpress-Examples/winforms-dashboard-custom-aggregates-server-mode

This example shows how to aggregate data by the field's first value in server mode.

Dashboard for WinForms - How to Aggregate Data by the Field's First Value

This example shows how to aggregate data by the field's first value in server mode.

Files to Look At

• Form1.cs (VB: Form1.vb)
• FirstValueFunction.cs (VB: FirstValueFunction.vb)
• Program.cs (VB: Program.vb)

Overview

In this example, the Grid dashboard item displays the first СontactName value by country.

The following expression gets the first value of the СontactName field:

Calculated Field	Expression
First Contact Name	FirstValue([ContactName])

Call the CriteriaOperator.RegisterCustomFunction method to register a custom function in your project (see Program.cs/Program.vb).

Documentation

• Expression Constants, Operators, and Functions
• Grouping
• ICustomFunctionOperatorBrowsable
• ICustomFunctionOperatorFormattable
• ICustomAggregateFunction

More Examples

• Dashboard for WinForms - How to Calculate the Numeric Group Interval
• Dashboard for WinForms - How to Calculate Fiscal Functions from Date-Time Data Fields
• Dashboard for WinForms - How to Aggregate Data by String Concatenation

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