LookupBindingPropertiesAttribute 類別

定義

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

繼承

Object

Attribute

LookupBindingPropertiesAttribute

屬性

AttributeUsageAttribute

範例

以下程式碼範例展示了基於查找的綁定所使用的屬性。

// 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

LookupBindingPropertiesAttribute屬性必須包含所有四個成員，除非是解除設定值。 以下程式碼範例展示了控制。ComboBox

// 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

以下程式碼範例顯示，控制項可以同時支援簡單綁定和清單綁定。

// 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

以下程式碼範例顯示，只要不指定參數，屬性 LookupBindingPropertiesAttribute 即可解除設定。

// 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

備註

用來 LookupBindingPropertiesAttribute 指定基於查找的綁定所使用的屬性，特別是 ListBox 和 ComboBox 控制項。

該 是在 LookupBindingPropertiesAttribute 類別層級中指定。 該類別可繼承，且不允許同一類別擁有多個屬性。

另請參閱

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