UnreferencedObjectEventHandler Delegate
Represents the method that handles the UnreferencedObject event of an XmlSerializer.
Assembly: System.Xml (in System.Xml.dll)
public delegate void UnreferencedObjectEventHandler( Object^ sender, UnreferencedObjectEventArgs^ e )
Parameters
- sender
- Type: System::Object
The source of the event.
- e
- Type: System.Xml.Serialization::UnreferencedObjectEventArgs
An UnreferencedObjectEventArgs that contains the event data.
When you create an UnreferencedObjectEventHandler delegate, you identify the method that handles the event. To associate the event with your event handler, add an instance of the delegate to the event. The event handler is called whenever the event occurs, unless you remove the delegate. For more information about event handler delegates, see Events and Delegates
The UnreferencedObject event occurs only when you call the Deserialize method.
The following example adds an UnreferencedObjectEventHandler to an XmlSerializer. The event is handled by the Serializer_UnreferencedObject method. To run the example, cut and paste the following XML into a file named UnrefObj.xml.
<wrapper>
<Group xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" id="id1" n1:GroupName=".NET" xmlns:n1="http://www.cpandl.com">
</Group>
<Vehicle id="id2" n1:type="Vehicle" xmlns:n1="http://www.w3.org/2001/XMLSchema-instance">
<licenseNumber xmlns:q1="http://www.w3.org/2001/XMLSchema" n1:type="q1:string">ABCD</licenseNumber>
</Vehicle>
<Vehicle id="id3" n1:type="Vehicle" xmlns:n1="http://www.w3.org/2001/XMLSchema-instance">
<licenseNumber xmlns:q1="http://www.w3.org/2001/XMLSchema" n1:type="q1:string">1234</licenseNumber>
</Vehicle>
</wrapper>
#using <System.Xml.dll> #using <System.dll> using namespace System; using namespace System::IO; using namespace System::Text; using namespace System::Xml; using namespace System::Xml::Serialization; using namespace System::Xml::Schema; ref class Vehicle; [SoapInclude(Vehicle::typeid)] public ref class Vehicle { public: String^ licenseNumber; }; // You must use the SoapIncludeAttribute to inform the XmlSerializer // that the Vehicle type should be recognized when deserializing. [SoapInclude(Vehicle::typeid)] public ref class Group { public: String^ GroupName; Vehicle^ GroupVehicle; }; public ref class Run { public: void DeserializeObject( String^ filename ) { // Create an instance of the XmlSerializer class. XmlTypeMapping^ myMapping = ((gcnew SoapReflectionImporter)->ImportTypeMapping( Group::typeid )); XmlSerializer^ mySerializer = gcnew XmlSerializer( myMapping ); mySerializer->UnreferencedObject += gcnew UnreferencedObjectEventHandler( this, &Run::Serializer_UnreferencedObject ); // Reading the file requires an XmlTextReader. XmlTextReader^ reader = gcnew XmlTextReader( filename ); reader->ReadStartElement(); // Deserialize and cast the object. Group^ myGroup; myGroup = dynamic_cast<Group^>(mySerializer->Deserialize( reader )); reader->ReadEndElement(); reader->Close(); } private: void Serializer_UnreferencedObject( Object^ /*sender*/, UnreferencedObjectEventArgs^ e ) { Console::WriteLine( "UnreferencedObject:" ); Console::WriteLine( "ID: {0}", e->UnreferencedId ); Console::WriteLine( "UnreferencedObject: {0}", e->UnreferencedObject ); Vehicle^ myVehicle = dynamic_cast<Vehicle^>(e->UnreferencedObject); Console::WriteLine( "License: {0}", myVehicle->licenseNumber ); } }; int main() { Run^ test = gcnew Run; test->DeserializeObject( "UnrefObj.xml" ); } // The file named S"UnrefObj.xml" should contain this XML: // <wrapper> // <Group xmlns:xsi=S"http://www.w3.org/2001/XMLSchema-instance" //xmlns:xsd=S"http://www.w3.org/2001/XMLSchema" id=S"id1" //n1:GroupName=S".NET" xmlns:n1=S"http://www.cpandl.com"> // </Group> //<Vehicle id=S"id2" n1:type=S"Vehicle" //xmlns:n1=S"http://www.w3.org/2001/XMLSchema-instance"> // <licenseNumber xmlns:q1=S"http://www.w3.org/2001/XMLSchema" //n1:type=S"q1:String*">ABCD</licenseNumber> // </Vehicle> //<Vehicle id=S"id3" n1:type=S"Vehicle" //xmlns:n1=S"http://www.w3.org/2001/XMLSchema-instance"> // <licenseNumber xmlns:q1=S"http://www.w3.org/2001/XMLSchema" //n1:type=S"q1:String*">1234</licenseNumber> // </Vehicle> //</wrapper>
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.