Creates and returns an empty objective function with the sense specified by sense and adds it to the invoking model.

Creates and returns an instance of IObjective representing an objective to optimize the expression expr with respect to the optimization sense indicated by sense and added to the invoking model.

Creates and returns an empty objective function with the specified name and with the specified sense and adds it to the invoking model.

Creates and returns an instance of IObjective representing an objective to optimize the expression expr with respect to the optimization sense indicated by sense, assigned the name name, and added to the invoking model.