DefaultEventAttribute Class
Specifies the default event for a component.
Assembly: System (in System.dll)
The DefaultEventAttribute type exposes the following members.
| Name | Description | |
|---|---|---|
![]() | DefaultEventAttribute | Initializes a new instance of the DefaultEventAttribute class. |
| Name | Description | |
|---|---|---|
![]() | Equals | Returns whether the value of the given object is equal to the current DefaultEventAttribute. (Overrides Attribute::Equals(Object).) |
![]() | Finalize | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.) |
![]() | GetHashCode | Returns the hash code for this instance. (Overrides Attribute::GetHashCode().) |
![]() | GetType | Gets the Type of the current instance. (Inherited from Object.) |
![]() | IsDefaultAttribute | When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute.) |
![]() | Match | When overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.) |
![]() | MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
![]() | ToString | Returns a string that represents the current object. (Inherited from Object.) |
| Name | Description | |
|---|---|---|
![]() ![]() | _Attribute::GetIDsOfNames | Maps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute.) |
![]() ![]() | _Attribute::GetTypeInfo | Retrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute.) |
![]() ![]() | _Attribute::GetTypeInfoCount | Retrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute.) |
![]() ![]() | _Attribute::Invoke | Provides access to properties and methods exposed by an object. (Inherited from Attribute.) |
Use the Name property to get the name of the default event.
For more information, see Extending Metadata Using Attributes.
The following example defines a collection class named MyCollection. The class is marked with a DefaultEventAttribute that specifies CollectionChanged as the default event.
[DefaultEvent("CollectionChanged")] public ref class TestCollection: public BaseCollection { private: CollectionChangeEventHandler^ onCollectionChanged; public: event CollectionChangeEventHandler^ CollectionChanged { public: void add(CollectionChangeEventHandler^ eventHandler) { onCollectionChanged += eventHandler; } protected: void remove(CollectionChangeEventHandler^ eventHandler) { onCollectionChanged -= eventHandler; } } // Insert additional code. };
The next example creates an instance of MyCollection. Then it gets the attributes for the class, extracts the DefaultEventAttribute, and prints the name of the default event.
int main() { // Creates a new collection. DefaultEventAttributeExample::TestCollection^ newCollection = gcnew DefaultEventAttributeExample::TestCollection; // Gets the attributes for the collection. AttributeCollection^ attributes = TypeDescriptor::GetAttributes(newCollection); // Prints the name of the default event by retrieving the // DefaultEventAttribute from the AttributeCollection. DefaultEventAttribute^ attribute = (DefaultEventAttribute^) attributes[DefaultEventAttribute::typeid]; Console::WriteLine("The default event is: {0}", attribute->Name); }
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
