ProvidePropertyAttribute 类

定义

public ref class ProvidePropertyAttribute sealed : Attribute

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

public sealed class ProvidePropertyAttribute : Attribute

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

type ProvidePropertyAttribute = class
    inherit Attribute

Public NotInheritable Class ProvidePropertyAttribute
Inherits Attribute

继承

Object

Attribute

ProvidePropertyAttribute

属性

AttributeUsageAttribute

示例

以下示例使用 ProvidePropertyAttribute 标记MyClass，告知编译器从 GetMyProperty 和 SetMyProperty 方法创建名为 MyProperty 的属性。

[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 = null;
    // Provides the Get portion of MyProperty. 
    public CultureInfo GetMyProperty(Control myControl) {
        // Insert code here.
        return 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) {
        return(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

注解

使用此属性标记类时，告知代码生成器使用你提供的名称创建扩展程序属性。 标记的类必须实现 IExtenderProvider。 因此，新属性可由容器中的其他组件使用。

在标记的类中，必须实现 Get<name> 和 Set<name> 方法。 例如，如果使用 [ProvideProperty (“PropertyName”) ] 标记类，则必须实现 GetPropertyName 和 SetPropertyName 方法。 若要将新属性指定为扩展器属性，必须从 IExtenderProvider实现 ，还必须实现 CanExtend 方法。

有关更多信息，请参阅特性。

构造函数

属性

方法

显式接口实现

适用于