Código Delphi
[-]valorPrev := DBGrid.DataSource.DataSet.Fields[DBGrid.SelectedField].AsFloat;
Cita:
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Read SelectedField to obtain access to the field component for the currently selected cell.
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Cita:
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Read SelectedIndex to determine which column in the grid has focus
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SelectedIndex te devuelve el Nº de Columna del Grid. En cambio SelectedField te devuelve el campo que has seleccionado.