XmlAttributeEventHandler Delegate
Represents the method that will handle the UnknownAttribute
[Visual Basic] <Serializable> Public Delegate Sub XmlAttributeEventHandler( _ ByVal sender As Object, _ ByVal e As XmlAttributeEventArgs _ ) [C#] [Serializable] public delegate void XmlAttributeEventHandler( object sender, XmlAttributeEventArgs e ); [C++] [Serializable] public __gc __delegate void XmlAttributeEventHandler( Object* sender, XmlAttributeEventArgs* e );
[JScript] In JScript, you can use the delegates in the .NET Framework, but you cannot define your own.
Parameters [Visual Basic, C#, C++]
The declaration of your event handler must have the same parameters as the XmlAttributeEventHandler delegate declaration.
- sender
- The source of the event.
- e
- An XmlAttributeEventArgs that contains the event data.
Remarks
When you create an XmlAttributeEventHandler delegate, you identify the method that will handle 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 UnknownAttribute event occurs only when an object is being deserialized with the Deserialize method.
Example
[Visual Basic, C#, C++] The following example deserializes a class named Group from a file named UnknownAttributes.xml. Whenever an element is found in the file that has no corresponding member in the class, the UnknownAttribute event occurs. To try the example, paste the XML code below into a file named UnknownAttributes.xml.
<?xml version="1.0" encoding="utf-8"?> <Group xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" GroupType = 'Technical' GroupNumber = '42' GroupBase = 'Red'> <GroupName>MyGroup</GroupName> </Group> [Visual Basic] Imports System Imports System.IO Imports System.Xml.Serialization Imports System.Xml Imports System.Xml.Schema Imports Microsoft.VisualBasic Public Class Group Public GroupName As String End Class Public Class Test Shared Sub Main() Dim t As Test = new Test() ' Deserialize the file containing unknown elements. t.DeserializeObject("UnknownAttributes.xml") End Sub Private Sub Serializer_UnknownAttribute _ (sender As Object , e As XmlAttributeEventArgs) Console.WriteLine("Unknown Attribute") Console.WriteLine(ControlChars.Tab & e.Attr.Name + " " & e.Attr.InnerXml) Console.WriteLine(ControlChars.Tab & e.LineNumber & ":" & e.LineNumber) Console.WriteLine(ControlChars.Tab & e.LinePosition & ":" & e.LinePosition) Dim x As Group = CType( e.ObjectBeingDeserialized, Group) Console.WriteLine (x.GroupName) Console.WriteLine (sender.ToString()) End Sub Private Sub DeserializeObject(filename As String) Dim ser As XmlSerializer = new XmlSerializer(GetType(Group)) ' Add a delegate to handle unknown element events. AddHandler ser.UnknownAttribute, _ AddressOf Serializer_UnknownAttribute ' A FileStream is needed to read the XML document. Dim fs As FileStream = new FileStream(filename, FileMode.Open) Dim g As Group = CType(ser.Deserialize(fs),Group) fs.Close() End Sub End Class [C#] using System; using System.IO; using System.Xml.Serialization; using System.Xml; using System.Xml.Schema; public class Group{ public string GroupName; } public class Test{ static void Main(){ Test t = new Test(); // Deserialize the file containing unknown elements. t.DeserializeObject("UnknownAttributes.xml"); } private void Serializer_UnknownAttribute(object sender, XmlAttributeEventArgs e){ Console.WriteLine("Unknown Attribute"); Console.WriteLine("\t" + e.Attr.Name + " " + e.Attr.InnerXml); Console.WriteLine("\t LineNumber: " + e.LineNumber); Console.WriteLine("\t LinePosition: " + e.LinePosition); Group x = (Group) e.ObjectBeingDeserialized; Console.WriteLine (x.GroupName); Console.WriteLine (sender.ToString()); } private void DeserializeObject(string filename){ XmlSerializer ser = new XmlSerializer(typeof(Group)); // Add a delegate to handle unknown element events. ser.UnknownAttribute+=new XmlAttributeEventHandler(Serializer_UnknownAttribute); // A FileStream is needed to read the XML document. FileStream fs = new FileStream(filename, FileMode.Open); Group g = (Group) ser.Deserialize(fs); fs.Close(); } } [C++] #using <mscorlib.dll> #using <System.Xml.dll> #using <System.dll> using namespace System; using namespace System::IO; using namespace System::Xml::Serialization; using namespace System::Xml; using namespace System::Xml::Schema; public __gc class Group{ public: String* GroupName; }; public __gc class Test{ public: static void main(){ Test* t = new Test(); // Deserialize the file containing unknown elements. t->DeserializeObject(S"UnknownAttributes.xml"); } private: void Serializer_UnknownAttribute(Object* sender, XmlAttributeEventArgs* e){ Console::WriteLine(S"Unknown Attribute"); Console::WriteLine(S"\t{0} {1}", e->Attr->Name, e->Attr->InnerXml); Console::WriteLine(S"\t LineNumber: {0}", __box(e->LineNumber)); Console::WriteLine(S"\t LinePosition: {0}", __box(e->LinePosition)); Group* x = dynamic_cast<Group*> (e->ObjectBeingDeserialized); Console::WriteLine (x->GroupName); Console::WriteLine (sender); } private: void DeserializeObject(String* filename){ XmlSerializer* ser = new XmlSerializer(__typeof(Group)); // Add a delegate to handle unknown element events. ser->UnknownAttribute+=new XmlAttributeEventHandler(this, &Test::Serializer_UnknownAttribute); // A FileStream is needed to read the XML document. FileStream* fs = new FileStream(filename, FileMode::Open); Group* g = dynamic_cast<Group*> (ser->Deserialize(fs)); fs->Close(); } }; int main() { Test::main(); }
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Requirements
Namespace: System.Xml.Serialization
Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family
Assembly: System.Xml (in System.Xml.dll)
See Also
System.Xml.Serialization Namespace | XmlNodeEventHandler | Deserialize | XmlSerializer