UnreferencedObjectEventArgs::UnreferencedId Property
Gets the ID of the object.
Assembly: System.Xml (in System.Xml.dll)
Use the UnreferencedId property when you need to know when more than one object raises the event. The property allows you to distinguish between multiple instances of unreferenced objects.
For more information about the UnreferencedId property, see the UnreferencedObject event.
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>
Available since 1.1