---
title: clsFactoryBase
summary: API reference for clsFactoryBase.
status: draft
owner: SAIF Doc Gen
last_reviewed: 2026-08-17
library: SAIF.Presentation.Web.MVC
reference_type: package
---

# clsFactoryBase

`clsFactoryBase` is the abstract factory contract that decouples `ViewPageBase`/`ViewControlBase` from the concrete controller and model types a given screen uses. Every screen supplies its own factory implementation; `ViewPageBase.Page_Init` and `ViewControlBase.Page_Init` call `GetController()` on the screen-supplied factory instance to obtain the controller that then drives the rest of the request lifecycle.

## Purpose
- Defines the two-method contract (`GetController`, `GetModel`) that lets the framework base classes construct screen-specific controller and model instances without any compile-time reference to those concrete types.
- Enables `clsControllerBase.Model`'s lazy construction: when no session-stored model exists for the current view, `m_factory.GetModel` supplies a fresh one.
- Enables `Navigate2`'s fresh-model creation path: `m_factory.GetModel` is used to construct the new model instance for a brand-new view GUID.

## Context
- Namespace: `SAIF.Presentation.Web.MVC`*
- Assembly/package: `SAIF.Presentation.Web.MVC`

## Public members
| Member | Signature | Purpose |
| --- | --- | --- |
| `GetController` | `Public MustOverride Function GetController() As clsControllerBase` | Returns the screen's concrete controller instance; implemented by each screen's own factory subclass |
| `GetModel` | `Public MustOverride Function GetModel() As clsModelBase` | Returns a new instance of the screen's concrete model type; implemented by each screen's own factory subclass |

## Behavioral notes
- Both members are abstract (`MustOverride`); `clsFactoryBase` itself performs no construction logic — it exists purely to give `ViewPageBase`/`ViewControlBase`/`clsControllerBase` a common type to hold a reference to.

## Constraints and usage notes
- `clsFactoryBase` is `MustInherit` and has no fields, constructor logic, or default implementations — every screen must supply a working factory subclass or the page/control cannot initialize its controller.

> **Note:** Statements marked with `*` were inferred from code structure, naming conventions, or contextual evidence where direct confirmation was not available in source artifacts.

## Sources
- SAIF.Presentation.Web.MVC/clsFactoryBase.vb