共用方式為

uidefault

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Indicates that the type information member is the default member for display in the user interface.

Allowed on

A member of an interface or dispinterface.

Flags

FUNCFLAG\_FUIDEFAULT VARFLAG\_FUIDEFAULT

Remarks

This attribute is used to mark an event as the default (the first one created) or a property as the default (the one to select first in the properties browser).

For example, Visual Basic uses this attribute in the following ways:

  • When an object is double-clicked at design time, Visual Basic jumps to the event in the default source interface that is marked as [uidefault]. If there is no such member, then Visual Basic displays the first one listed in the default source interface.

  • When an object is selected at design time, by default, the Properties window in Visual Basic displays the property in the default interface that is marked as [uidefault]. If there is no such member, then Visual Basic displays the first one listed in the default interface.

Example

 [   odl, 
   dual,
   uuid(1e196b20-1f3c-1069-996b-00dd010ef676),
   restricted
]
interface IForm: IDispatch
{
   [propget]
   HRESULT Backcolor([out, retval] long *Value);

   [propput]
   HRESULT Backcolor([in] long Value);


   [propget, uidefault]
   HRESULT Name([out, retval] BSTR *Value);

   [propput, uidefault]
   HRESULT Name([in] BSTR Value);
}

[   odl, 
   dual,
   uuid(1e196b20-1f3c-1069-996b-00dd010ef767),
   restricted
]
interface IFormEvents: IDispatch
{
   [uidefault]
   HRESULT Click();

   HRESULT Resize();
}

[uuid(1e196b20-1f3c-1069-996b-00dd010fe676)]
coclass Form
{
   [default] interface IForm;
   [default, source] interface IFormEvents;
}

Attribute Descriptions