WinForms Filter Editor - Create and register custom functions

This example creates three custom functions:

• NotBeginsWith - a function opposite to the standard BeginsWith function.
• IsDaysInterval - checks whether a record belongs to the “(Today - N days) ~ (Today + N days)” timeframe.
• IsWeekend - shows only Saturday and Sunday records.

The example demonstrates three methods (techniques) for registering custom functions (depending on the registration type you are using, feature availability may vary):

• Handle the control's QueryCustomFunctions event - custom functions added on this event are available for this specific UI control only.
• Handle the CriteriaOperator.QueryCustomFunctions event to register global custom functions available for all Filter/FilterEditor controls in the application.
• Use the DevExpress.Data.Filtering.CustomFunction attribute in a data source class - a custom function registered by this attribute is available for all Filter/FilterEditor controls that are bound to this data source.

Documentation

• FilterControl Class

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