ProvidePropertyAttribute 類別

定義

public ref class ProvidePropertyAttribute sealed : Attribute

[System.AttributeUsage(System.AttributeTargets.Class, AllowMultiple=true)]
public sealed class ProvidePropertyAttribute : Attribute

[<System.AttributeUsage(System.AttributeTargets.Class, AllowMultiple=true)>]
type ProvidePropertyAttribute = class
    inherit Attribute

Public NotInheritable Class ProvidePropertyAttribute
Inherits Attribute

繼承

Object

Attribute

ProvidePropertyAttribute

屬性

AttributeUsageAttribute

範例

以下範例以 標記 MyClass ，指示編譯器從 and SetMyProperty 方法中建立一個屬性MyPropertyGetMyProperty。ProvidePropertyAttribute

[ProvideProperty("MyProperty",Control::typeid)]
public ref class MyClass: public IExtenderProvider
{
protected:
   CultureInfo^ ciMine;

public:
   // Provides the Get portion of MyProperty. 
   CultureInfo^ GetMyProperty( Control^ myControl )
   {
      // Insert code here.
      return ciMine;
   }

   // Provides the Set portion of MyProperty.
   void SetMyProperty( Control^ myControl, String^ value )
   {
      // Insert code here.
   }

   /* When you inherit from IExtenderProvider, you must implement the 
        * CanExtend method. */
   virtual bool CanExtend( Object^ target )
   {
      return dynamic_cast<Control^>(target) != nullptr;
   }
   // Insert additional code here.
};

[ProvideProperty("MyProperty", typeof(Control))]
public class MyClass : IExtenderProvider
{
    protected CultureInfo ciMine;
    // Provides the Get portion of MyProperty. 
    public CultureInfo GetMyProperty(Control myControl) =>
        // Insert code here.
        ciMine;

    // Provides the Set portion of MyProperty.
    public void SetMyProperty(Control myControl, string value)
    {
        // Insert code here.
    }

    /* When you inherit from IExtenderProvider, you must implement the 
     * CanExtend method. */
    public bool CanExtend(object target) => target is Control;

    // Insert additional code here.
}

<ProvideProperty("MyProperty", GetType(Control))> _
Public Class SampleClass
    Implements IExtenderProvider
    Protected ciMine As CultureInfo = Nothing

    ' Provides the Get portion of MyProperty. 
    Public Function GetMyProperty(myControl As Control) As CultureInfo
        ' Insert code here.
        Return ciMine
    End Function 'GetMyProperty

    ' Provides the Set portion of MyProperty.
    Public Sub SetMyProperty(myControl As Control, value As String)
        ' Insert code here.
    End Sub

    ' When you inherit from IExtenderProvider, you must implement the 
    ' CanExtend method. 
    Public Function CanExtend(target As [Object]) As Boolean Implements IExtenderProvider.CanExtend
        Return TypeOf target Is Control
    End Function 'CanExtend

    ' Insert additional code here.

End Class

備註

當你標記一個帶有這個屬性的類別時，你會告訴程式碼產生器建立一個包含你所提供名稱的擴充屬性。 標記類別必須實作 IExtenderProvider。 因此，這個新特性可以被容器中的其他元件使用。

在標記的類別中，你必須實作 Get<name> 和 Set<name> 方法。 例如，如果你用 [ProvideProperty（“PropertyName”）] 標記一個類別，你必須實作 GetPropertyName 和 SetPropertyName 方法。 若要指定新屬性為擴展屬性，你必須從 實作 ， IExtenderProvider你也必須實作一個 CanExtend 方法。

如需詳細資訊，請參閱屬性。