LookupBindingPropertiesAttribute Classe

Definição

public ref class LookupBindingPropertiesAttribute sealed : Attribute

[System.AttributeUsage(System.AttributeTargets.Class)]
public sealed class LookupBindingPropertiesAttribute : Attribute

[<System.AttributeUsage(System.AttributeTargets.Class)>]
type LookupBindingPropertiesAttribute = class
    inherit Attribute

Public NotInheritable Class LookupBindingPropertiesAttribute
Inherits Attribute

Herança

Object

Attribute

LookupBindingPropertiesAttribute

Atributos

AttributeUsageAttribute

Exemplos

O exemplo de código a seguir mostra as propriedades usadas com associação baseada em pesquisa.

// The DemoControl class shows properties 
// used with lookup-based binding.
[LookupBindingProperties(
    "DataSource",
    "DisplayMember",
    "ValueMember",
    "LookupMember")]
public class DemoControl : Control;

' The DemoControl class shows properties 
' used with lookup-based binding.
<LookupBindingProperties( _
"DataSource", _
"DisplayMember", _
"ValueMember", _
"LookupMember")> _
Public Class DemoControl
    Inherits Control
End Class

O LookupBindingPropertiesAttribute atributo deve incluir todos os quatro membros, exceto ao desafinar valores. O exemplo de código a seguir mostra o ComboBox controle.

// The DemoComboBox control shows a standard
// combo box binding definition.
[LookupBindingProperties(
    "DataSource",
    "DisplayMember",
    "ValueMember",
    "SelectedValue")]
public class DemoComboBox : Control;

' The DemoComboBox control shows a standard
' combo box binding definition.
<LookupBindingProperties( _
"DataSource", _
"DisplayMember", _
"ValueMember", _
"SelectedValue")> _
Public Class DemoComboBox
    Inherits Control
End Class

O exemplo de código a seguir mostra que um controle pode dar suporte tanto à associação simples quanto à associação de lista.

// The DemoComboBox2 class shows that a control can
// support both simple binding as well as list binding.
[LookupBindingProperties(
    "DataSource",
    "DisplayMember",
    "ValueMember",
    "SelectedValue")]
[DefaultBindingProperty("Text")]
public class DemoComboBox2 : Control;

' The DemoComboBox2 class shows that a control can
' support both simple binding as well as list binding.
<LookupBindingProperties( _
"DataSource", _
"DisplayMember", _
"ValueMember", _
"SelectedValue"), _
DefaultBindingProperty("Text")> _
Public Class DemoComboBox2
    Inherits Control
End Class

O exemplo de código a seguir mostra que o LookupBindingPropertiesAttribute atributo pode ser desconjunto especificando nenhum argumento.

// NonBindableCombo control shows how to unset the
// LookupBindingProperties by specifying no arguments.
[LookupBindingProperties()]
public class NonBindableCombo : Control;

' NonBindableCombo control shows how to unset the
' LookupBindingProperties by specifying no arguments.
<LookupBindingProperties()>  _
Public Class NonBindableCombo
    Inherits Control
End Class

Comentários

O LookupBindingPropertiesAttribute é usado para especificar as propriedades usadas com associação baseada em pesquisa, particularmente ListBox e ComboBox controles.

O LookupBindingPropertiesAttribute é especificado no nível da classe. A classe pode ser herdada e não permite vários atributos na mesma classe.

Confira também

• IBindingList
• ListBox
• ComboBox
• BindableAttribute
• ComplexBindingPropertiesAttribute
• DefaultBindingPropertyAttribute