| True DataControl 8.0 Reference > PropertyExpression Object > PropertyExpression Object Properties > ValueExpression Property (PropertyExpression) |
ValueExpression Property (PropertyExpression)
Specifies the expression used to evaluate the value of a control property.
PropertyExpression.ValueExpression= variant
Read/Write at run time and design time. Property applies to PropertyExpression object.
This property specifies the expression that provides the value for the associated property at run time. The TData control evaluates this expression after positioning on a record, and when some variable in this expression changes. Control property is then set to the result of this evaluation. This way, True DataControl maintains the value of a property of any control depending on certain variables.
See Control Property Expressions for more information.
See True DataControl Expressions for more information about expressions in general. Evaluation rules for ValueExpression are as follows:
Expression Level: Record level
Synchronous Evaluation: Evaluated after the TData control has been positioned on a record.
Asynchronous Evaluation: Updates the value of the associated control property.
See Also