RAD Studio VCL Reference
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TCustomAdapterMultiValueField.OnHasValue Event

Indicates whether a particular value is associated with this adapter field.

Pascal
property OnHasValue: TAdapterFieldHasValueEvent;
C++
__property TAdapterFieldHasValueEvent OnHasValue;

ImplHasValue calls this event handler. Implement this event handler to lookup a matching value. Implementation of this event handler is optional. If OnHasValue is nil, ImplHasValue will search for a matching value the Values and ValueCount properties. 

 

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