FireDAC.Comp.DataSet.TFDAggregate.InUse
| [–] Properties | |
|---|---|
| Type: property | |
| Visibility: public | |
| Source: FireDAC.Comp.DataSet.pas FireDAC.Comp.DataSet.hpp
| |
| Unit: FireDAC.Comp.DataSet | |
| Parent: TFDAggregate | |
Delphi
property InUse: Boolean read GetInUse;
C++
__property bool InUse = {read=GetInUse, nodefault};
Description
Indicates whether the aggregated value is currently available.
Read InUse to determine whether the Value property returns an aggregated value.
When InUse is False, Value is not accessible and it returns null. When InUse is True, the aggregated value is maintained. So it calculates the formula specified by Expression for the current set of records, including any edits to the records in the current group. The value is accessible and Value returns a meaningful value.
Example
if FDQuery1.Aggregates[0].InUse then
Label1.Caption := VarToStr(FDQuery1.Aggregates[0].Value)
else
Label1.Caption := '<not accessible>';