DefaultPropertyAttribute 類別

定義

public ref class DefaultPropertyAttribute sealed : Attribute

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

type DefaultPropertyAttribute = class
    inherit Attribute

Public NotInheritable Class DefaultPropertyAttribute
Inherits Attribute

繼承

Object

Attribute

DefaultPropertyAttribute

屬性

AttributeUsageAttribute

範例

下列範例會定義名為MyControl的控制項。The following example defines a control named MyControl. 類別會以DefaultPropertyAttribute指定MyProperty為預設屬性的來標示。The class is marked with a DefaultPropertyAttribute that specifies MyProperty as the default property.

[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.
          return 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

下一個範例會建立的實例MyControl。The next example creates an instance of MyControl. 然後, 它會取得類別的屬性、解壓縮DefaultPropertyAttribute, 並列印預設屬性的名稱。Then it gets the attributes for the class, extracts the DefaultPropertyAttribute, and prints the name of the default property.

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 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 = 
       (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

備註

Name使用屬性來取得預設屬性的名稱。Use the Name property to get the name of the default property.

如需詳細資訊，請參閱屬性。For more information, see Attributes.

建構函式

欄位

屬性

方法

明確介面實作

適用於

另請參閱

• Attribute