XmlAttributes.XmlElements Свойство

Ссылка

Определение

Пространство имен:: System.Xml.Serialization

Сборка:: System.Xml.XmlSerializer.dll

Сборка:: System.Xml.dll

Сборка:: netstandard.dll

Важно!

Некоторые сведения относятся к предварительной версии продукта, в которую до выпуска могут быть внесены существенные изменения. Майкрософт не предоставляет никаких гарантий, явных или подразумеваемых, относительно приведенных здесь сведений.

Получение коллекции объектов, задающих сериализацию с помощью XmlSerializer для открытого поля или свойства чтения/записи как элемента XML.

public:
 property System::Xml::Serialization::XmlElementAttributes ^ XmlElements { System::Xml::Serialization::XmlElementAttributes ^ get(); };

public System.Xml.Serialization.XmlElementAttributes XmlElements { get; }

member this.XmlElements : System.Xml.Serialization.XmlElementAttributes

Public ReadOnly Property XmlElements As XmlElementAttributes

Значение свойства

XmlElementAttributes

XmlElementAttributes, содержащий коллекцию объектов XmlElementAttribute.

Примеры

В следующем примере сериализуется Transportation класс, содержащий одно поле с именем Vehicles , которое возвращает объект ArrayList. В этом примере к полю применяются два XmlElementAttribute атрибута Vehicles . В примере создаются два XmlElementAttribute объекта и добавляются в коллекцию XmlElementAttributes XmlAttributes объекта. Чтобы разрешить массиву принимать различные типы объектов, XmlAttributes объект добавляется в XmlAttributeOverrides объект.

#using <System.Xml.dll>
#using <System.dll>

using namespace System;
using namespace System::IO;
using namespace System::Xml::Serialization;
using namespace System::Collections;
using namespace System::Xml;

public ref class Car
{
public:
   String^ Name;
};

public ref class Plane
{
public:
   String^ Name;
};

public ref class Truck
{
public:
   String^ Name;
};

public ref class Train
{
public:
   String^ Name;
};

public ref class Transportation
{
public:

   // Subsequent code overrides these two XmlElementAttributes.

   [XmlElement(Car::typeid),
   XmlElement(Plane::typeid)]
   ArrayList^ Vehicles;
};

// Return an XmlSerializer used for overriding.
XmlSerializer^ CreateOverrider()
{
   // Create the XmlAttributes and XmlAttributeOverrides objects.
   XmlAttributes^ attrs = gcnew XmlAttributes;
   XmlAttributeOverrides^ xOver = gcnew XmlAttributeOverrides;

   /* Create an XmlElementAttribute to override 
      the Vehicles property. */
   XmlElementAttribute^ xElement1 = gcnew XmlElementAttribute( Truck::typeid );

   // Add the XmlElementAttribute to the collection.
   attrs->XmlElements->Add( xElement1 );

   /* Create a second XmlElementAttribute, and 
      add it to the collection. */
   XmlElementAttribute^ xElement2 = gcnew XmlElementAttribute( Train::typeid );
   attrs->XmlElements->Add( xElement2 );

   /* Add the XmlAttributes to the XmlAttributeOverrides,
      specifying the member to override. */
   xOver->Add( Transportation::typeid, "Vehicles", attrs );

   // Create the XmlSerializer, and return it.
   XmlSerializer^ xSer = gcnew XmlSerializer( Transportation::typeid,xOver );
   return xSer;
}

void SerializeObject( String^ filename )
{
   // Create an XmlSerializer instance.
   XmlSerializer^ xSer = CreateOverrider();

   // Create the object and serialize it.
   Transportation^ myTransportation = gcnew Transportation;

   /* Create two new override objects that can be
      inserted into the array. */
   myTransportation->Vehicles = gcnew ArrayList;
   Truck^ myTruck = gcnew Truck;
   myTruck->Name = "MyTruck";
   Train^ myTrain = gcnew Train;
   myTrain->Name = "MyTrain";
   myTransportation->Vehicles->Add( myTruck );
   myTransportation->Vehicles->Add( myTrain );
   TextWriter^ writer = gcnew StreamWriter( filename );
   xSer->Serialize( writer, myTransportation );
}

int main()
{
   SerializeObject( "OverrideElement.xml" );
}

using System;
using System.IO;
using System.Xml.Serialization;
using System.Collections;
using System.Xml;

public class Transportation
{
   // Subsequent code overrides these two XmlElementAttributes.
   [XmlElement(typeof(Car)),
   XmlElement(typeof(Plane))]
   public ArrayList Vehicles;
}

public class Car
{
   public string Name;
}

public class Plane
{
   public string Name;
}
public class Truck
{
   public string Name;
}
public class Train
{
   public string Name;
}

public class Test
{
   public static void Main()
   {
      Test t = new Test();
      t.SerializeObject("OverrideElement.xml");
   }

   // Return an XmlSerializer used for overriding.
   public XmlSerializer CreateOverrider()
   {
      // Create the XmlAttributes and XmlAttributeOverrides objects.
      XmlAttributes attrs = new XmlAttributes();

      XmlAttributeOverrides xOver =
      new XmlAttributeOverrides();

      /* Create an XmlElementAttribute to override
      the Vehicles property. */
      XmlElementAttribute xElement1 =
      new XmlElementAttribute(typeof(Truck));
      // Add the XmlElementAttribute to the collection.
      attrs.XmlElements.Add(xElement1);

      /* Create a second XmlElementAttribute, and
      add it to the collection. */
      XmlElementAttribute xElement2 =
      new XmlElementAttribute(typeof(Train));
      attrs.XmlElements.Add(xElement2);

      /* Add the XmlAttributes to the XmlAttributeOverrides,
      specifying the member to override. */
      xOver.Add(typeof(Transportation), "Vehicles", attrs);

      // Create the XmlSerializer, and return it.
      XmlSerializer xSer = new XmlSerializer
      (typeof(Transportation), xOver);
      return xSer;
   }

   public void SerializeObject(string filename)
   {
      // Create an XmlSerializer instance.
      XmlSerializer xSer = CreateOverrider();

      // Create the object and serialize it.
      Transportation myTransportation =
      new Transportation();

      /* Create two new override objects that can be
      inserted into the array. */
      myTransportation.Vehicles = new ArrayList();
      Truck myTruck = new Truck();
      myTruck.Name = "MyTruck";

      Train myTrain = new Train();
      myTrain.Name = "MyTrain";

      myTransportation.Vehicles.Add(myTruck);
      myTransportation.Vehicles.Add(myTrain);

      TextWriter writer = new StreamWriter(filename);
      xSer.Serialize(writer, myTransportation);
   }
}

Imports System.IO
Imports System.Xml.Serialization
Imports System.Collections
Imports System.Xml


Public Class Transportation
    ' Subsequent code overrides these two XmlElementAttributes.
    <XmlElement(GetType(Car)), _
     XmlElement(GetType(Plane))> _
    Public Vehicles As ArrayList
End Class

Public Class Car
    Public Name As String
End Class

Public Class Plane
    Public Name As String
End Class

Public Class Truck
    Public Name As String
End Class

Public Class Train
    Public Name As String
End Class


Public Class Test
    
    Public Shared Sub Main()
        Dim t As New Test()
        t.SerializeObject("OverrideElement.xml")
    End Sub
    
    
    ' Return an XmlSerializer used for overriding.
    Public Function CreateOverrider() As XmlSerializer
        ' Create the XmlAttributes and XmlAttributeOverrides objects.
        Dim attrs As New XmlAttributes()
        
        Dim xOver As New XmlAttributeOverrides()
        
        
        ' Create an XmlElementAttribute to override
        ' the Vehicles property. 
        Dim xElement1 As New XmlElementAttribute(GetType(Truck))
        ' Add the XmlElementAttribute to the collection.
        attrs.XmlElements.Add(xElement1)
        
        ' Create a second XmlElementAttribute, and
        ' add it to the collection. 
        Dim xElement2 As New XmlElementAttribute(GetType(Train))
        attrs.XmlElements.Add(xElement2)
        
        ' Add the XmlAttributes to the XmlAttributeOverrides,
        ' specifying the member to override. 
        xOver.Add(GetType(Transportation), "Vehicles", attrs)
        
        ' Create the XmlSerializer, and return it.
        Dim xSer As New XmlSerializer(GetType(Transportation), xOver)
        Return xSer
    End Function
    
    
    Public Sub SerializeObject(ByVal filename As String)
        ' Create an XmlSerializer instance.
        Dim xSer As XmlSerializer = CreateOverrider()
        
        ' Create the object and serialize it.
        Dim myTransportation As New Transportation()
        
        ' Create two new override objects that can be'
        ' inserted into the array. 
        myTransportation.Vehicles = New ArrayList()
        Dim myTruck As New Truck()
        myTruck.Name = "MyTruck"
        
        Dim myTrain As New Train()
        myTrain.Name = "MyTrain"
        
        myTransportation.Vehicles.Add(myTruck)
        myTransportation.Vehicles.Add(myTrain)
        
        Dim writer As New StreamWriter(filename)
        xSer.Serialize(writer, myTransportation)
    End Sub
End Class

Для каждого переопределенного элемента, сериализованного в виде XML-элемента, необходимо добавить новый элемент в XmlElementAttributes метод XmlElementAttribute путем вызова Add метода. По умолчанию XmlElementAttributes объект создается и назначается свойству XmlElements .

Применяется к

XmlAttributes.XmlElements Свойство

Определение

Значение свойства

Примеры

Комментарии

Применяется к

Дополнительные ресурсы