How to Create and Register Custom Filter Editor Functions

This example illustrates how to create 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 sample also illustrates three ways you can register these functions. Depending on the registration type you use, the function's availabily may differ.

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

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