Adds new field expression to the dataset.
function AddFieldExpression(const Expression: TExpression; StrictReferences: boolean = False): TFieldExpression; overload;
The method adds new field expression to the dataset. The name of the dataset field being created will be set automatically, according to the specified expression. To explicitly specify the name for the resulting field, overloaded AddFieldExpression methods can be used. To delete the field expression, TCustomEntityDataSet.DeleteFieldExpression method is used. To clear all dataset field expressions, the TCustomEntityDataSet.ClearFieldExpressions method is used.