clsLabelBinder

This binder renders a business-object value into a Label for read-only display, with optional formatting for dates and decimals and special handling for Date.MinValue. It uses the shared reflection-based accessors from clsObjectBinderBase but intentionally remains one-way so display fields can participate in the same binding registration model as editable controls.

Purpose

• Display a bound object value in a Label without custom page code.
• Apply format strings for typed values while suppressing placeholder output for Date.MinValue.
• Reuse the library's binder registration and validation context for read-only fields.

Context

• Namespace: SAIF.Presentation.Web.Binding
• Assembly/package: SAIF.Presentation.Web.Binding.Infragistics103 (embedded/bundled as source, not independently packaged)

Public members

Member	Signature	Purpose
BindProperty	Property BindProperty As String	Names the business-object property whose value becomes the label text.
FormatString	Property FormatString As String	Supplies the formatting rule applied when rendering typed values.
BindSource	Property BindSource As Object	Holds the business object that supplies the display value and validation context.
Label	Property Label As Label	Attaches the concrete label control and registers it with the base binder pipeline.
Init()	Overrides Sub Init()	Performs no event wiring because labels do not participate in control-to-object updates.
ObjectToControl()	Overrides Function ObjectToControl() As Boolean	Reads the bound property and writes formatted or raw text into the label control.
## Inherited public members
Member	Signature	Purpose
---	---	---
ContainsError	ReadOnly Property ContainsError As Boolean	Set by GetErrors()/validation processing; when true, Validate()/RefreshValidation() counts this binder toward the overall invalid result and its control receives error-state CSS via SetControlFormat().
IsDualBinding	ReadOnly Property IsDualBinding As Boolean	When true, ObjectToControl()/ControlToObject() read and write the display object/property while GetErrors() checks a separate validation object/property, as configured by AddDualBinder().
ControlPadding	Property ControlPadding As PadArgs	When UsePadding is enabled, pads or trims the value written to the control during ObjectToControl(), so fixed-width display formatting is applied without changing the underlying object value.
ObjectPadding	Property ObjectPadding As PadArgs	When UsePadding is enabled, pads or strips padding from the value written back to the bound property during ControlToObject(), so stored data is not polluted with display-only padding characters.
UsePadding	Property UsePadding As Boolean	Enables the ControlPadding/ObjectPadding transforms during ObjectToControl()/ControlToObject(); when false, values pass through unpadded regardless of the padding arguments configured.
UseEvents	Property UseEvents As Boolean	When true, Init() wires the control's native change event so a user edit immediately calls ControlToObject() instead of waiting for an explicit BindToObject()/Validate() call.
ControlErrors	ReadOnly Property ControlErrors As ArrayList	Holds the error text GetErrors() collects from the bound object's IDataErrorInfo implementation; Validate() aggregates these strings into the consolidated ErrorLabel/SAIFMessage output.
BindType	Property BindType As BindTypes	Determines which of ObjectToControl()/ControlToObject() actually run during DataBind()/BindToObject(), controlling whether this binder is push-only, pull-only, both, or validation-only.
FormControl	Overridable Property FormControl As WebControl	Setting this property runs ProcessControl, which applies binder-specific control setup (event wiring readiness, CSS baseline) before the control participates in binding and validation passes.
FormControlID	Overridable ReadOnly Property FormControlID As String	Supplied to Update() and error-focus logic to locate this binder's control instance on the page without holding a direct control reference.
Init()	MustOverride Sub Init()	Called once during AddBinder() registration; each concrete binder overrides this to hook the native control event needed for event-driven ControlToObject() and to perform any control-specific setup.
ObjectToControl()	MustOverride Function ObjectToControl() As Boolean	Invoked by DataBind() for binders configured as ObjectToControl/TwoWay; each concrete binder overrides this to translate the bound property's value into the control-specific display state.
ControlToObject()	Protected Friend MustOverride Sub ControlToObject()	Invoked by BindToObject() for binders configured as ControlToObject/TwoWay; each concrete binder overrides this to convert the control's current value back into the bound property's type.
SetControlFormat(inValid As Boolean)	Protected Friend Overridable Sub SetControlFormat(inValid As Boolean)	Called by Validate()/RefreshValidation() after error collection; sets the control's CssClass to the valid/error color per BR-BIND-001, BR-BIND-002, and BR-BIND-003, giving the reader a visual cue of validation state.
GetErrors()	Protected Friend Overridable Sub GetErrors()	Reads the bound object's IDataErrorInfo.Item(property) during Validate()/RefreshValidation() and appends any non-empty message to ControlErrors, driving both ContainsError and the consolidated error display.
GetObjectValueAsString(inBizObject, inPropertyName)	Function GetObjectValueAsString(inBizObject As Object, inPropertyName As String) As String	Used by ObjectToControl() to fetch the bound property's current value as display-ready text, applying ObjectPadding/ControlPadding first when UsePadding is enabled.
GetObjectValue(inBizObject, inPropertyName)	Function GetObjectValue(inBizObject As Object, inPropertyName As String) As Object	Used by ObjectToControl() and type-sensitive binders to fetch the bound property's value in its native CLR type, before any control-specific conversion or formatting.
SetObjectValueAsString(inBizObject, inPropertyName, inValue)	Protected Function SetObjectValueAsString(inBizObject As Object, inPropertyName As String, inValue As String) As Boolean	Used by ControlToObject() to write a control-derived string back onto the bound property, applying padding/trim rules first when UsePadding is enabled, so the object receives a correctly formatted value.
SetObjectValue(inBizObject, inPropertyName, inValue)	Protected Function SetObjectValue(inBizObject As Object, inPropertyName As String, inValue As Object) As Boolean	Used by ControlToObject() to write a converted, strongly typed value back onto the bound property, bypassing string formatting for binders that perform their own type conversion.
ValidationKey	Friend Overridable ReadOnly Property ValidationKey As String	Computed by AddBinder() to key the bound object into m_ValidationObjects per BR-BIND-006, ensuring repeated Validate() passes re-check the correct distinct object.
IsSAIFFrameWorkObject	Friend Overridable ReadOnly Property IsSAIFFrameWorkObject(Optional inObj As Object) As Boolean	Detects SAIF framework objects by walking the CLR base-type chain for clsBusinessBase/clsBusinessCollectionBase.
## Behavioral notes
- With an empty FormatString, the binder writes the property's string value directly.
- For formatted DateTime values, Date.MinValue becomes an empty string instead of a rendered sentinel date.
- ControlToObject() is intentionally empty, so label rendering never writes back to the business object.

Constraints and usage notes

• This binder only populates Label.Text.
• A non-empty FormatString assumes the bound property returns a non-Nothing value with a compatible runtime type.

Sources

• SAIF.Presentation.Web.Binding.Infragistics103\ASPControls\clsLabelBinder.vb
• SAIF.Presentation.Web.Binding.Infragistics103\clsObjectBinderbase.vb