DefaultPropertyAttribute Klasse

Definition

public ref class DefaultPropertyAttribute sealed : Attribute

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

public sealed class DefaultPropertyAttribute : Attribute

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

type DefaultPropertyAttribute = class
    inherit Attribute

Public NotInheritable Class DefaultPropertyAttribute
Inherits Attribute

Vererbung

Object

Attribute

DefaultPropertyAttribute

Attribute

AttributeUsageAttribute

Beispiele

Im folgenden Beispiel wird ein Steuerelement mit dem Namen MyControldefiniert. Die Klasse ist mit einer DefaultPropertyAttribute Eigenschaft gekennzeichnet, die als Standardeigenschaft angibt MyProperty .

[DefaultProperty("MyProperty")]
ref class MyControl: public Control
{
public:

   property int MyProperty 
   {
      int get()
      {
         // Insert code here.
         return 0;
      }

      void set( int value )
      {
         // Insert code here.
      }
   }
   // Insert any additional code.
};

[DefaultProperty("MyProperty")]
public class MyControl : Control
{
    public int MyProperty
    {
        get =>
            // Insert code here.
            0;
        set
        {
            // Insert code here.
        }
    }

    // Insert any additional code.
}

<DefaultProperty("MyProperty")> _
Public Class MyControl
    Inherits Control

    Public Property MyProperty() As Integer
        Get
            ' Insert code here.
            Return 0
        End Get
        Set
            ' Insert code here.
        End Set 
    End Property
    ' Insert any additional code.
End Class

Im nächsten Beispiel wird eine Instanz von MyControl. Anschließend werden die Attribute für die Klasse extrahiert DefaultPropertyAttributeund der Name der Standardeigenschaft gedruckt.

int main()
{
   // Creates a new control.
   Form1::MyControl^ myNewControl = gcnew Form1::MyControl;

   // Gets the attributes for the collection.
   AttributeCollection^ attributes = TypeDescriptor::GetAttributes( myNewControl );

   /* Prints the name of the default property by retrieving the 
       * DefaultPropertyAttribute from the AttributeCollection. */
   DefaultPropertyAttribute^ myAttribute = dynamic_cast<DefaultPropertyAttribute^>(attributes[ DefaultPropertyAttribute::typeid ]);
   Console::WriteLine( "The default property is: {0}", myAttribute->Name );
   return 0;
}

public static int Main()
{
    // Creates a new control.
    MyControl myNewControl = new();

    // Gets the attributes for the collection.
    AttributeCollection attributes = TypeDescriptor.GetAttributes(myNewControl);

    /* Prints the name of the default property by retrieving the 
     * DefaultPropertyAttribute from the AttributeCollection. */
    DefaultPropertyAttribute myAttribute =
       (DefaultPropertyAttribute)attributes[typeof(DefaultPropertyAttribute)];
    Console.WriteLine("The default property is: " + myAttribute.Name);

    return 0;
}

Public Shared Function Main() As Integer
    ' Creates a new control.
    Dim myNewControl As New MyControl()
    
    ' Gets the attributes for the collection.
    Dim attributes As AttributeCollection = TypeDescriptor.GetAttributes(myNewControl)
    
    ' Prints the name of the default property by retrieving the
    ' DefaultPropertyAttribute from the AttributeCollection. 
    Dim myAttribute As DefaultPropertyAttribute = _
        CType(attributes(GetType(DefaultPropertyAttribute)), DefaultPropertyAttribute)
    Console.WriteLine(("The default property is: " + myAttribute.Name))
    Return 0
End Function 'Main

Hinweise

Verwenden Sie die Name Eigenschaft, um den Namen der Standardeigenschaft abzurufen.

Weitere Informationen finden Sie unter Attribute.

Weitere Informationen

• Attribute