XmlAttributeOverrides.Add Método
Definição
Importante
Algumas informações se referem a produtos de pré-lançamento que podem ser substancialmente modificados antes do lançamento. A Microsoft não oferece garantias, expressas ou implícitas, das informações aqui fornecidas.
Adiciona um objeto XmlAttributes à coleção de objetos XmlAttributes.
Sobrecargas
Add(Type, XmlAttributes) |
Adiciona um objeto XmlAttributes à coleção de objetos XmlAttributes. O parâmetro |
Add(Type, String, XmlAttributes) |
Adiciona um objeto XmlAttributes à coleção de objetos XmlAttributes. O parâmetro |
Add(Type, XmlAttributes)
Adiciona um objeto XmlAttributes à coleção de objetos XmlAttributes. O parâmetro type
especifica um objeto a ser substituído pelo objeto XmlAttributes.
public:
void Add(Type ^ type, System::Xml::Serialization::XmlAttributes ^ attributes);
public void Add (Type type, System.Xml.Serialization.XmlAttributes attributes);
member this.Add : Type * System.Xml.Serialization.XmlAttributes -> unit
Public Sub Add (type As Type, attributes As XmlAttributes)
Parâmetros
- attributes
- XmlAttributes
Um objeto XmlAttributes que representa os atributos de substituição.
Exemplos
O exemplo a seguir serializa uma classe nomeada Band
derivada de uma classe chamada Orchestra
. O exemplo cria um XmlRootAttribute objeto e o atribui à XmlRoot propriedade de um XmlAttributes objeto. Em seguida, o exemplo chama o Add método para adicionar o XmlAttributes objeto ao XmlAttributeOverrides objeto.
#using <System.Xml.dll>
#using <System.dll>
using namespace System;
using namespace System::IO;
using namespace System::Xml::Serialization;
ref class Band;
ref class Instrument;
/* This is the class that will be overridden. The XmlIncludeAttribute
tells the XmlSerializer that the overriding type exists. */
[XmlInclude(Band::typeid)]
public ref class Orchestra
{
public:
array<Instrument^>^Instruments;
};
// This is the overriding class.
public ref class Band: public Orchestra
{
public:
String^ BandName;
};
public ref class Instrument
{
public:
String^ Name;
};
void SerializeObject( String^ filename )
{
/* Each object that is being overridden requires
an XmlAttributes object. */
XmlAttributes^ attrs = gcnew XmlAttributes;
// An XmlRootAttribute allows overriding the Orchestra class.
XmlRootAttribute^ xmlRoot = gcnew XmlRootAttribute;
// Set the object to the XmlAttribute.XmlRoot property.
attrs->XmlRoot = xmlRoot;
// Create an XmlAttributeOverrides object.
XmlAttributeOverrides^ attrOverrides = gcnew XmlAttributeOverrides;
// Add the XmlAttributes to the XmlAttributeOverrrides.
attrOverrides->Add( Orchestra::typeid, attrs );
// Create the XmlSerializer using the XmlAttributeOverrides.
XmlSerializer^ s = gcnew XmlSerializer( Orchestra::typeid,attrOverrides );
// Writing the file requires a TextWriter.
TextWriter^ writer = gcnew StreamWriter( filename );
// Create the object using the derived class.
Band^ band = gcnew Band;
band->BandName = "NewBand";
// Create an Instrument.
Instrument^ i = gcnew Instrument;
i->Name = "Trumpet";
array<Instrument^>^myInstruments = {i};
band->Instruments = myInstruments;
// Serialize the object.
s->Serialize( writer, band );
writer->Close();
}
void DeserializeObject( String^ filename )
{
XmlAttributes^ attrs = gcnew XmlAttributes;
XmlRootAttribute^ attr = gcnew XmlRootAttribute;
attrs->XmlRoot = attr;
XmlAttributeOverrides^ attrOverrides = gcnew XmlAttributeOverrides;
attrOverrides->Add( Orchestra::typeid, "Instruments", attrs );
XmlSerializer^ s = gcnew XmlSerializer( Orchestra::typeid,attrOverrides );
FileStream^ fs = gcnew FileStream( filename,FileMode::Open );
// Deserialize the Band object.
Band^ band = dynamic_cast<Band^>(s->Deserialize( fs ));
Console::WriteLine( "Brass:" );
System::Collections::IEnumerator^ myEnum = band->Instruments->GetEnumerator();
while ( myEnum->MoveNext() )
{
Instrument^ i = safe_cast<Instrument^>(myEnum->Current);
Console::WriteLine( i->Name );
}
}
int main()
{
SerializeObject( "Override.xml" );
DeserializeObject( "Override.xml" );
}
using System;
using System.IO;
using System.Xml.Serialization;
/* This is the class that will be overridden. The XmlIncludeAttribute
tells the XmlSerializer that the overriding type exists. */
[XmlInclude(typeof(Band))]
public class Orchestra
{
public Instrument[] Instruments;
}
// This is the overriding class.
public class Band:Orchestra
{
public string BandName;
}
public class Instrument
{
public string Name;
}
public class Run
{
public static void Main()
{
Run test = new Run();
test.SerializeObject("Override.xml");
test.DeserializeObject("Override.xml");
}
public void SerializeObject(string filename)
{
/* Each object that is being overridden requires
an XmlAttributes object. */
XmlAttributes attrs = new XmlAttributes();
// An XmlRootAttribute allows overriding the Orchestra class.
XmlRootAttribute xmlRoot = new XmlRootAttribute();
// Set the object to the XmlAttribute.XmlRoot property.
attrs.XmlRoot = xmlRoot;
// Create an XmlAttributeOverrides object.
XmlAttributeOverrides attrOverrides =
new XmlAttributeOverrides();
// Add the XmlAttributes to the XmlAttributeOverrrides.
attrOverrides.Add(typeof(Orchestra), attrs);
// Create the XmlSerializer using the XmlAttributeOverrides.
XmlSerializer s =
new XmlSerializer(typeof(Orchestra), attrOverrides);
// Writing the file requires a TextWriter.
TextWriter writer = new StreamWriter(filename);
// Create the object using the derived class.
Band band = new Band();
band.BandName = "NewBand";
// Create an Instrument.
Instrument i = new Instrument();
i.Name = "Trumpet";
Instrument[] myInstruments = {i};
band.Instruments = myInstruments;
// Serialize the object.
s.Serialize(writer,band);
writer.Close();
}
public void DeserializeObject(string filename)
{
XmlAttributes attrs = new XmlAttributes();
XmlRootAttribute attr = new XmlRootAttribute();
attrs.XmlRoot = attr;
XmlAttributeOverrides attrOverrides =
new XmlAttributeOverrides();
attrOverrides.Add(typeof(Orchestra), "Instruments", attrs);
XmlSerializer s =
new XmlSerializer(typeof(Orchestra), attrOverrides);
FileStream fs = new FileStream(filename, FileMode.Open);
// Deserialize the Band object.
Band band = (Band) s.Deserialize(fs);
Console.WriteLine("Brass:");
foreach(Instrument i in band.Instruments)
{
Console.WriteLine(i.Name);
}
}
}
Option Explicit
Option Strict
Imports System.IO
Imports System.Xml.Serialization
' This is the class that will be overridden. The XmlIncludeAttribute
' tells the XmlSerializer that the overriding type exists.
<XmlInclude(GetType(Band))> _
Public Class Orchestra
Public Instruments() As Instrument
End Class
' This is the overriding class.
Public Class Band
Inherits Orchestra
Public BandName As String
End Class
Public Class Instrument
Public Name As String
End Class
Public Class Run
Public Shared Sub Main()
Dim test As New Run()
test.SerializeObject("Override.xml")
test.DeserializeObject("Override.xml")
End Sub
Public Sub SerializeObject(ByVal filename As String)
' Each object that is being overridden requires
' an XmlAttributes object.
Dim attrs As New XmlAttributes()
' An XmlRootAttribute allows overriding the Orchestra class.
Dim xmlRoot As New XmlRootAttribute()
' Set the object to the XmlAttribute.XmlRoot property.
attrs.XmlRoot = xmlRoot
' Create an XmlAttributeOverrides object.
Dim attrOverrides As New XmlAttributeOverrides()
' Add the XmlAttributes to the XmlAttributeOverrrides.
attrOverrides.Add(GetType(Orchestra), attrs)
' Create the XmlSerializer using the XmlAttributeOverrides.
Dim s As New XmlSerializer(GetType(Orchestra), attrOverrides)
' Writing the file requires a TextWriter.
Dim writer As New StreamWriter(filename)
' Create the object using the derived class.
Dim band As New Band()
band.BandName = "NewBand"
' Create an Instrument.
Dim i As New Instrument()
i.Name = "Trumpet"
Dim myInstruments() As Instrument = {i}
band.Instruments = myInstruments
' Serialize the object.
s.Serialize(writer, band)
writer.Close()
End Sub
Public Sub DeserializeObject(ByVal filename As String)
Dim attrs As New XmlAttributes()
Dim attr As New XmlRootAttribute()
attrs.XmlRoot = attr
Dim attrOverrides As New XmlAttributeOverrides()
attrOverrides.Add(GetType(Orchestra), "Instruments", attrs)
Dim s As New XmlSerializer(GetType(Orchestra), attrOverrides)
Dim fs As New FileStream(filename, FileMode.Open)
' Deserialize the Band object.
Dim band As Band = CType(s.Deserialize(fs), Band)
Console.WriteLine("Brass:")
Dim i As Instrument
For Each i In band.Instruments
Console.WriteLine(i.Name)
Next i
End Sub
End Class
Comentários
O XmlAttributes objeto contém uma união de objetos de atributo que faz com que o XmlSerializer comportamento de serialização padrão seja substituído por um conjunto de objetos. Você escolhe os objetos de atributo a serem colocados no XmlAttributes objeto, dependendo dos comportamentos específicos que deseja substituir. Por exemplo, o XmlSerializer serializa um membro de classe como um elemento XML por padrão. Se você quiser que o membro seja serializado como um atributo XM, crie um XmlAttributeAttribute, atribua-o XmlAttribute à propriedade de um XmlAttributese adicione o XmlAttributes objeto ao XmlAttributeOverrides objeto.
Use essa sobrecarga para substituir um XmlRootAttribute ou XmlTypeAttribute.
Confira também
Aplica-se a
Add(Type, String, XmlAttributes)
Adiciona um objeto XmlAttributes à coleção de objetos XmlAttributes. O parâmetro type
especifica um objeto a ser substituído. O parâmetro member
especifica o nome de um membro que é substituído.
public:
void Add(Type ^ type, System::String ^ member, System::Xml::Serialization::XmlAttributes ^ attributes);
public void Add (Type type, string member, System.Xml.Serialization.XmlAttributes attributes);
public void Add (Type type, string member, System.Xml.Serialization.XmlAttributes? attributes);
member this.Add : Type * string * System.Xml.Serialization.XmlAttributes -> unit
Public Sub Add (type As Type, member As String, attributes As XmlAttributes)
Parâmetros
- member
- String
O nome do membro a ser substituído.
- attributes
- XmlAttributes
Um objeto XmlAttributes que representa os atributos de substituição.
Exemplos
O exemplo a seguir cria um XmlAttributeAttribute objeto e o XmlAttribute atribui à propriedade de um XmlAttributes objeto. O exemplo adiciona o XmlAttributes objeto a um XmlAttributeOverrides objeto antes de criar um XmlSerializer.
// This is the class that will be serialized.
public ref class Group
{
public:
String^ GroupName;
[XmlAttributeAttribute]
int GroupCode;
};
public ref class Sample
{
public:
XmlSerializer^ CreateOverrider()
{
// Create an XmlAttributeOverrides object.
XmlAttributeOverrides^ xOver = gcnew XmlAttributeOverrides;
/* Create an XmlAttributeAttribute to override the base class
object's XmlAttributeAttribute object. Give the overriding object
a new attribute name ("Code"). */
XmlAttributeAttribute^ xAtt = gcnew XmlAttributeAttribute;
xAtt->AttributeName = "Code";
/* Create an instance of the XmlAttributes class and set the
XmlAttribute property to the XmlAttributeAttribute object. */
XmlAttributes^ attrs = gcnew XmlAttributes;
attrs->XmlAttribute = xAtt;
/* Add the XmlAttributes object to the XmlAttributeOverrides
and specify the type and member name to override. */
xOver->Add( Group::typeid, "GroupCode", attrs );
XmlSerializer^ xSer = gcnew XmlSerializer( Group::typeid,xOver );
return xSer;
}
};
// This is the class that will be serialized.
public class Group
{
public string GroupName;
[XmlAttribute]
public int GroupCode;
}
public class Sample
{
public XmlSerializer CreateOverrider()
{
// Create an XmlAttributeOverrides object.
XmlAttributeOverrides xOver = new XmlAttributeOverrides();
/* Create an XmlAttributeAttribute to override the base class
object's XmlAttributeAttribute object. Give the overriding object
a new attribute name ("Code"). */
XmlAttributeAttribute xAtt = new XmlAttributeAttribute();
xAtt.AttributeName = "Code";
/* Create an instance of the XmlAttributes class and set the
XmlAttribute property to the XmlAttributeAttribute object. */
XmlAttributes attrs = new XmlAttributes();
attrs.XmlAttribute = xAtt;
/* Add the XmlAttributes object to the XmlAttributeOverrides
and specify the type and member name to override. */
xOver.Add(typeof(Group), "GroupCode", attrs);
XmlSerializer xSer = new XmlSerializer(typeof(Group), xOver);
return xSer;
}
}
' This is the class that will be serialized.
Public Class Group
Public GroupName As String
<XmlAttribute()> Public GroupCode As Integer
End Class
Public Class Sample
Public Function CreateOverrider() As XmlSerializer
' Create an XmlAttributeOverrides object.
Dim xOver As New XmlAttributeOverrides()
' Create an XmlAttributeAttribute to override the base class
' object's XmlAttributeAttribute object. Give the overriding object
' a new attribute name ("Code").
Dim xAtt As New XmlAttributeAttribute()
xAtt.AttributeName = "Code"
' Create an instance of the XmlAttributes class and set the
' XmlAttribute property to the XmlAttributeAttribute object.
Dim attrs As New XmlAttributes()
attrs.XmlAttribute = xAtt
' Add the XmlAttributes object to the XmlAttributeOverrides
' and specify the type and member name to override.
xOver.Add(GetType(Group), "GroupCode", attrs)
Dim xSer As New XmlSerializer(GetType(Group), xOver)
Return xSer
End Function
End Class
Comentários
O XmlAttributes objeto contém uma união de objetos de atributo que faz com que o XmlSerializer comportamento de serialização padrão seja substituído por um conjunto de objetos. Você escolhe os objetos de atributo a serem colocados no XmlAttributes objeto, dependendo dos comportamentos específicos que deseja substituir. Por exemplo, o XmlSerializer serializa um membro de classe como um elemento XML por padrão. Se você quiser que o membro seja serializado como um atributo XML, crie um XmlAttributeAttribute, atribua-o XmlAttribute à propriedade de um XmlAttributese adicione o XmlAttributes objeto ao XmlAttributeOverrides objeto.
Use esse método ao tentar substituir umXmlElementAttribute, XmlAttributeAttribute, XmlArrayAttributeou XmlArrayItemAttributeXmlIgnoreAttribute.