UnreferencedObjectEventArgs.UnreferencedId Property
Definition
Important
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Gets the ID of the object.
public:
property System::String ^ UnreferencedId { System::String ^ get(); };
public string? UnreferencedId { get; }
public string UnreferencedId { get; }
member this.UnreferencedId : string
Public ReadOnly Property UnreferencedId As String
Property Value
The ID of the object.
Examples
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:
// <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">
//<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 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>
using System;
using System.IO;
using System.Text;
using System.Xml;
using System.Xml.Serialization;
using System.Xml.Schema;
// You must use the SoapIncludeAttribute to inform the XmlSerializer
// that the Vehicle type should be recognized when deserializing.
[SoapInclude(typeof(Vehicle))]
public class Group
{
public string GroupName;
public Vehicle GroupVehicle;
}
[SoapInclude(typeof(Vehicle))]
public class Vehicle
{
public string licenseNumber;
}
public class Run
{
public static void Main()
{
Run test = new Run();
test.DeserializeObject("UnrefObj.xml");
}
public void DeserializeObject(string filename)
{
// Create an instance of the XmlSerializer class.
XmlTypeMapping myMapping =
(new SoapReflectionImporter().ImportTypeMapping(
typeof(Group)));
XmlSerializer mySerializer =
new XmlSerializer(myMapping);
mySerializer.UnreferencedObject +=
new UnreferencedObjectEventHandler
(Serializer_UnreferencedObject);
// Reading the file requires an XmlTextReader.
XmlTextReader reader=
new XmlTextReader(filename);
reader.ReadStartElement();
// Deserialize and cast the object.
Group myGroup;
myGroup = (Group) mySerializer.Deserialize(reader);
reader.ReadEndElement();
reader.Close();
}
private void Serializer_UnreferencedObject
(object sender, UnreferencedObjectEventArgs e){
Console.WriteLine("UnreferencedObject:");
Console.WriteLine("ID: " + e.UnreferencedId);
Console.WriteLine("UnreferencedObject: " + e.UnreferencedObject);
Vehicle myVehicle = (Vehicle) e.UnreferencedObject;
Console.WriteLine("License: " + myVehicle.licenseNumber);
}
}
// The file named "UnrefObj.xml" should contain this XML:
// <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">
//<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 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>
Imports System.IO
Imports System.Text
Imports System.Xml
Imports System.Xml.Serialization
Imports System.Xml.Schema
' You must use the SoapIncludeAttribute to inform the XmlSerializer
' that the Vehicle type should be recognized when deserializing.
<SoapInclude(GetType(Vehicle))> _
Public Class Group
Public GroupName As String
public GroupVehicle As Vehicle
End Class
Public Class Vehicle
Public licenseNumber As String
End Class
Public Class Run
Shared Sub Main()
Dim test As Run = new Run()
test.DeserializeObject("UnrefObj.xml")
End Sub
Public Sub DeserializeObject(filename As String)
' Create an instance of the XmlSerializer class.
Dim myMapping As XmlTypeMapping = _
(new SoapReflectionImporter().ImportTypeMapping _
(GetType(Group)))
Dim mySerializer As XmlSerializer = _
new XmlSerializer(myMapping)
AddHandler mySerializer.UnreferencedObject, _
AddressOf Serializer_UnreferencedObject
' Reading the file requires an XmlTextReader.
Dim reader As XmlTextReader = _
new XmlTextReader(filename)
reader.ReadStartElement()
' Deserialize and cast the object.
Dim myGroup As Group
myGroup = CType( mySerializer.Deserialize(reader), Group)
reader.ReadEndElement()
reader.Close()
End Sub
Private Sub Serializer_UnreferencedObject _
(sender As object , e As UnreferencedObjectEventArgs)
Console.WriteLine("UnreferencedObject:")
Console.WriteLine("ID: " + e.UnreferencedId)
Console.WriteLine("UnreferencedObject: " + e.UnreferencedObject)
Dim myVehicle As Vehicle = CType(e.UnreferencedObject, Vehicle)
Console.WriteLine("License: " + myVehicle.licenseNumber)
End Sub
End Class
' The XML document should contain this information:
' <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">
'<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 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>
Remarks
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.
Applies to
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