XmlElementAttribute Konstruktoren

Referenz

Definition

Namespace:: System.Xml.Serialization

Assembly:: System.Xml.XmlSerializer.dll

Assembly:: System.Xml.ReaderWriter.dll

Assembly:: System.Xml.dll

Assembly:: netstandard.dll

Wichtig

Einige Informationen beziehen sich auf Vorabversionen, die vor dem Release ggf. grundlegend überarbeitet werden. Microsoft übernimmt hinsichtlich der hier bereitgestellten Informationen keine Gewährleistungen, seien sie ausdrücklich oder konkludent.

Initialisiert eine neue Instanz der XmlElementAttribute-Klasse.

Überlädt

XmlElementAttribute()	Initialisiert eine neue Instanz der XmlElementAttribute-Klasse.
XmlElementAttribute(String)	Initialisiert eine neue Instanz der XmlElementAttribute-Klasse und gibt den Namen des XML-Elements an.
XmlElementAttribute(Type)	Initialisiert eine neues Instanz der XmlElementAttribute-Klasse und gibt einen Typ für den Member an, auf den das XmlElementAttribute angewendet wird. Dieser Typ wird vom XmlSerializer verwendet, wenn das Objekt serialisiert oder deserialisiert wird, in dem es enthalten ist.
XmlElementAttribute(String, Type)	Initialisiert eine neue Instanz von XmlElementAttribute, und gibt den Namen des XML-Elements und einen abgeleiteten Typ für den Member an, auf den das XmlElementAttribute angewendet wird. Dieser Membertyp wird verwendet, wenn der XmlSerializer das Objekt serialisiert, in dem es enthalten ist.

XmlElementAttribute()

Initialisiert eine neue Instanz der XmlElementAttribute-Klasse.

public:
 XmlElementAttribute();

public XmlElementAttribute ();

Public Sub New ()

Beispiele

Im folgenden Beispiel wird die XmlElementAttribute Klasse angewendet.

public ref class MyClass
{
public:

   [XmlElement]
   String^ TeacherName;
};

public class MyClass
{
   [XmlElement()]
   public string TeacherName;
}

Public Class MyClass1
    <XmlElement()> Public TeacherName As String
End Class

Gilt für

XmlElementAttribute(String)

Initialisiert eine neue Instanz der XmlElementAttribute-Klasse und gibt den Namen des XML-Elements an.

public:
 XmlElementAttribute(System::String ^ elementName);

public XmlElementAttribute (string elementName);

public XmlElementAttribute (string? elementName);

new System.Xml.Serialization.XmlElementAttribute : string -> System.Xml.Serialization.XmlElementAttribute

Public Sub New (elementName As String)

Parameter

elementName: String

Der XML-Elementname des serialisierten Members.

Beispiele

Im folgenden Beispiel wird eine einfache Klasse gezeigt, die ein einzelnes Feld mit dem Namen " Vehicles. Das Beispiel wendet XmlElementAttribute das Feld an und enthält den elementName Parameter, wodurch die XmlSerializer Anweisung zum Generieren von XML-Elementen namens "Cars" anstelle von "Vehicles" angegeben wird.

public ref class Transportation
{
public:

   [XmlElement("Cars")]
   String^ Vehicles;
};

public class Transportation
{
   [XmlElement("Cars")]
   public string Vehicles;
}

Public Class Transportation
    <XmlElement("Cars")> Public Vehicles As String
End Class

Hinweise

Standardmäßig verwendet der XmlSerializer Membername als XML-Elementname beim Serialisieren einer Klasseninstanz. Beispielsweise generiert ein Feld namens "XML" ein XML-Element mit dem Vehicle Namen Vehicle". Wenn Sie jedoch ein anderes Element benötigen, z Cars. B. , übergeben Sie es im elementName Parameter.

Gilt für

XmlElementAttribute(Type)

Initialisiert eine neues Instanz der XmlElementAttribute-Klasse und gibt einen Typ für den Member an, auf den das XmlElementAttribute angewendet wird. Dieser Typ wird vom XmlSerializer verwendet, wenn das Objekt serialisiert oder deserialisiert wird, in dem es enthalten ist.

public:
 XmlElementAttribute(Type ^ type);

public XmlElementAttribute (Type type);

public XmlElementAttribute (Type? type);

new System.Xml.Serialization.XmlElementAttribute : Type -> System.Xml.Serialization.XmlElementAttribute

Public Sub New (type As Type)

Parameter

type: Type

Der Type eines Objekts, das vom Typ des Members abgeleitet ist.

Beispiele

Im folgenden Beispiel wird eine Klasse mit dem Namen Orchestra eines einzelnen Felds Instrumentsnamens serialisiert, das ein Array von Instrument Objekten zurückgibt. Eine zweite Klasse namens Brass erbt von der Instrument Klasse. Das Beispiel wendet XmlElementAttribute das Feld an Instruments , und gibt den Brass Typ an, mit dem das Instruments Feld Objekte akzeptiert Brass . Im Beispiel wird auch der Name des XML-Elements angegeben, indem Sie die ElementName Eigenschaft festlegen.

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

using namespace System;
using namespace System::IO;
using namespace System::Xml::Serialization;
public ref class Instrument
{
public:
   String^ Name;
};

public ref class Brass: public Instrument
{
public:
   bool IsValved;
};

public ref class Orchestra
{
public:
   array<Instrument^>^Instruments;
};

void SerializeObject( String^ filename )
{
   // To write the file, a TextWriter is required.
   TextWriter^ writer = gcnew StreamWriter( filename );
   XmlAttributeOverrides^ attrOverrides = gcnew XmlAttributeOverrides;
   XmlAttributes^ attrs = gcnew XmlAttributes;

   // Creates an XmlElementAttribute that overrides the Instrument type.
   XmlElementAttribute^ attr = gcnew XmlElementAttribute( Brass::typeid );
   attr->ElementName = "Brass";

   // Adds the element to the collection of elements.
   attrs->XmlElements->Add( attr );
   attrOverrides->Add( Orchestra::typeid, "Instruments", attrs );

   // Creates the XmlSerializer using the XmlAttributeOverrides.
   XmlSerializer^ s = gcnew XmlSerializer( Orchestra::typeid,attrOverrides );

   // Creates the object to serialize.
   Orchestra^ band = gcnew Orchestra;

   // Creates an object of the derived type.
   Brass^ i = gcnew Brass;
   i->Name = "Trumpet";
   i->IsValved = true;
   array<Instrument^>^myInstruments = {i};
   band->Instruments = myInstruments;
   s->Serialize( writer, band );
   writer->Close();
}

void DeserializeObject( String^ filename )
{
   XmlAttributeOverrides^ attrOverrides = gcnew XmlAttributeOverrides;
   XmlAttributes^ attrs = gcnew XmlAttributes;

   // Creates an XmlElementAttribute that override the Instrument type.
   XmlElementAttribute^ attr = gcnew XmlElementAttribute( Brass::typeid );
   attr->ElementName = "Brass";

   // Adds the element to the collection of elements.
   attrs->XmlElements->Add( attr );
   attrOverrides->Add( Orchestra::typeid, "Instruments", attrs );

   // Creates the XmlSerializer using the XmlAttributeOverrides.
   XmlSerializer^ s = gcnew XmlSerializer( Orchestra::typeid,attrOverrides );
   FileStream^ fs = gcnew FileStream( filename,FileMode::Open );
   Orchestra^ band = dynamic_cast<Orchestra^>(s->Deserialize( fs ));
   Console::WriteLine( "Brass:" );

   /* Deserializing differs from serializing. To read the 
      derived-object values, declare an object of the derived 
      type (Brass) and cast the Instrument instance to it. */
   Brass^ b;
   System::Collections::IEnumerator^ myEnum = band->Instruments->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      Instrument^ i = safe_cast<Instrument^>(myEnum->Current);
      b = dynamic_cast<Brass^>(i);
      Console::WriteLine( "{0}\n{1}", b->Name, b->IsValved );
   }
}

int main()
{
   SerializeObject( "Override.xml" );
   DeserializeObject( "Override.xml" );
}

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

public class Orchestra
{
   public Instrument[] Instruments;
}

public class Instrument
{
   public string Name;
}

public class Brass:Instrument{
   public bool IsValved;
}

public class Run
{
    public static void Main()
    {
       Run test = new Run();
       test.SerializeObject("Override.xml");
       test.DeserializeObject("Override.xml");
    }

    public void SerializeObject(string filename)
    {
      // To write the file, a TextWriter is required.
      TextWriter writer = new StreamWriter(filename);

      XmlAttributeOverrides attrOverrides =
         new XmlAttributeOverrides();
      XmlAttributes attrs = new XmlAttributes();

      // Creates an XmlElementAttribute that overrides the Instrument type.
      XmlElementAttribute attr = new
      XmlElementAttribute(typeof(Brass));
      attr.ElementName = "Brass";

      // Adds the element to the collection of elements.
      attrs.XmlElements.Add(attr);
      attrOverrides.Add(typeof(Orchestra), "Instruments", attrs);

      // Creates the XmlSerializer using the XmlAttributeOverrides.
      XmlSerializer s =
      new XmlSerializer(typeof(Orchestra), attrOverrides);

      // Creates the object to serialize.
      Orchestra band = new Orchestra();

      // Creates an object of the derived type.
      Brass i = new Brass();
      i.Name = "Trumpet";
      i.IsValved = true;
      Instrument[] myInstruments = {i};
      band.Instruments = myInstruments;
      s.Serialize(writer,band);
      writer.Close();
   }

   public void DeserializeObject(string filename)
   {
      XmlAttributeOverrides attrOverrides =
         new XmlAttributeOverrides();
      XmlAttributes attrs = new XmlAttributes();

      // Creates an XmlElementAttribute that override the Instrument type.
      XmlElementAttribute attr = new
      XmlElementAttribute(typeof(Brass));
      attr.ElementName = "Brass";

      // Adds the element to the collection of elements.
      attrs.XmlElements.Add(attr);
      attrOverrides.Add(typeof(Orchestra), "Instruments", attrs);

      // Creates the XmlSerializer using the XmlAttributeOverrides.
      XmlSerializer s =
      new XmlSerializer(typeof(Orchestra), attrOverrides);

      FileStream fs = new FileStream(filename, FileMode.Open);
      Orchestra band = (Orchestra) s.Deserialize(fs);
      Console.WriteLine("Brass:");

      /* Deserializing differs from serializing. To read the
         derived-object values, declare an object of the derived
         type (Brass) and cast the Instrument instance to it. */
      Brass b;
      foreach(Instrument i in band.Instruments)
      {
         b= (Brass)i;
         Console.WriteLine(
         b.Name + "\n" +
         b.IsValved);
      }
   }
}

Option Strict
Option Explicit

Imports System.IO
Imports System.Xml.Serialization

Public Class Orchestra
    Public Instruments() As Instrument
End Class

Public Class Instrument
    Public Name As String
End Class

Public Class Brass
    Inherits Instrument
    Public IsValved As Boolean
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(filename As String)
        ' To write the file, a TextWriter is required.
        Dim writer As New StreamWriter(filename)
        
        Dim attrOverrides As New XmlAttributeOverrides()
        Dim attrs As New XmlAttributes()
        
        ' Creates an XmlElementAttribute that overrides the Instrument type.
        Dim attr As New XmlElementAttribute(GetType(Brass))
        attr.ElementName = "Brass"
        
        ' Adds the element to the collection of elements.
        attrs.XmlElements.Add(attr)
        attrOverrides.Add(GetType(Orchestra), "Instruments", attrs)
        
        ' Creates the XmlSerializer using the XmlAttributeOverrides.
        Dim s As New XmlSerializer(GetType(Orchestra), attrOverrides)
        
        ' Creates the object to serialize.
        Dim band As New Orchestra()
        
        ' Creates an object of the derived type.
        Dim i As New Brass()
        i.Name = "Trumpet"
        i.IsValved = True
        Dim myInstruments() As Instrument = {i}
        band.Instruments = myInstruments
        s.Serialize(writer, band)
        writer.Close()
    End Sub
    
    
    Public Sub DeserializeObject(filename As String)
        Dim attrOverrides As New XmlAttributeOverrides()
        Dim attrs As New XmlAttributes()
        
        ' Create an XmlElementAttribute that override the Instrument type.
        Dim attr As New XmlElementAttribute(GetType(Brass))
        attr.ElementName = "Brass"
        
        ' Add the element to the collection of elements.
        attrs.XmlElements.Add(attr)
        attrOverrides.Add(GetType(Orchestra), "Instruments", attrs)
        
        ' Create the XmlSerializer using the XmlAttributeOverrides.
        Dim s As New XmlSerializer(GetType(Orchestra), attrOverrides)
        
        Dim fs As New FileStream(filename, FileMode.Open)
        Dim band As Orchestra = CType(s.Deserialize(fs), Orchestra)
        Console.WriteLine("Brass:")
        
        ' Deserializing differs from serializing. To read the
        ' derived-object values, declare an object of the derived
        ' type (Brass) and cast the Instrument instance to it. 
        Dim b As Brass
        Dim i As Instrument
        For Each i In  band.Instruments
            b = CType(i, Brass)
            Console.WriteLine((b.Name + ControlChars.Cr + b.IsValved.ToString()))
        Next i
    End Sub
End Class

Hinweise

Verwenden Sie den Parameter, um einen Typ anzugeben, der type aus einer Basisklasse abgeleitet wird. Angenommen, eine Eigenschaft mit dem Namen MyAnimal gibt ein Animal Objekt zurück. Sie möchten das Objekt verbessern, sodass Sie eine neue Klasse mit dem Namen Mammal ", die von der Animal Klasse erbt, erstellen. Um die XmlSerializer Klasse anzuweisen, die Klasse zu akzeptieren Mammal , wenn sie die Eigenschaft serialisiert MyAnimal , übergeben Type Mammal Sie die Klasse an den Konstruktor.

Gilt für

XmlElementAttribute(String, Type)

Initialisiert eine neue Instanz von XmlElementAttribute, und gibt den Namen des XML-Elements und einen abgeleiteten Typ für den Member an, auf den das XmlElementAttribute angewendet wird. Dieser Membertyp wird verwendet, wenn der XmlSerializer das Objekt serialisiert, in dem es enthalten ist.

public:
 XmlElementAttribute(System::String ^ elementName, Type ^ type);

public XmlElementAttribute (string elementName, Type type);

public XmlElementAttribute (string? elementName, Type? type);

new System.Xml.Serialization.XmlElementAttribute : string * Type -> System.Xml.Serialization.XmlElementAttribute

Public Sub New (elementName As String, type As Type)

Parameter

elementName: String

Der XML-Elementname des serialisierten Members.

type: Type

Der Type eines Objekts, das vom Typ des Members abgeleitet ist.

Beispiele

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

using namespace System;
using namespace System::IO;
using namespace System::Xml::Serialization;
public ref class Instrument
{
public:
   String^ Name;
};

public ref class Brass: public Instrument
{
public:
   bool IsValved;
};

public ref class Orchestra
{
public:
   array<Instrument^>^Instruments;
};

void SerializeObject( String^ filename )
{
   // To write the file, a TextWriter is required.
   TextWriter^ writer = gcnew StreamWriter( filename );
   XmlAttributeOverrides^ attrOverrides = gcnew XmlAttributeOverrides;
   XmlAttributes^ attrs = gcnew XmlAttributes;

   // Creates an XmlElementAttribute that overrides the Instrument type.
   XmlElementAttribute^ attr = gcnew XmlElementAttribute( Brass::typeid );
   attr->ElementName = "Brass";

   // Adds the element to the collection of elements.
   attrs->XmlElements->Add( attr );
   attrOverrides->Add( Orchestra::typeid, "Instruments", attrs );

   // Creates the XmlSerializer using the XmlAttributeOverrides.
   XmlSerializer^ s = gcnew XmlSerializer( Orchestra::typeid,attrOverrides );

   // Creates the object to serialize.
   Orchestra^ band = gcnew Orchestra;

   // Creates an object of the derived type.
   Brass^ i = gcnew Brass;
   i->Name = "Trumpet";
   i->IsValved = true;
   array<Instrument^>^myInstruments = {i};
   band->Instruments = myInstruments;
   s->Serialize( writer, band );
   writer->Close();
}

void DeserializeObject( String^ filename )
{
   XmlAttributeOverrides^ attrOverrides = gcnew XmlAttributeOverrides;
   XmlAttributes^ attrs = gcnew XmlAttributes;

   // Creates an XmlElementAttribute that override the Instrument type.
   XmlElementAttribute^ attr = gcnew XmlElementAttribute( Brass::typeid );
   attr->ElementName = "Brass";

   // Adds the element to the collection of elements.
   attrs->XmlElements->Add( attr );
   attrOverrides->Add( Orchestra::typeid, "Instruments", attrs );

   // Creates the XmlSerializer using the XmlAttributeOverrides.
   XmlSerializer^ s = gcnew XmlSerializer( Orchestra::typeid,attrOverrides );
   FileStream^ fs = gcnew FileStream( filename,FileMode::Open );
   Orchestra^ band = dynamic_cast<Orchestra^>(s->Deserialize( fs ));
   Console::WriteLine( "Brass:" );

   /* Deserializing differs from serializing. To read the 
      derived-object values, declare an object of the derived 
      type (Brass) and cast the Instrument instance to it. */
   Brass^ b;
   System::Collections::IEnumerator^ myEnum = band->Instruments->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      Instrument^ i = safe_cast<Instrument^>(myEnum->Current);
      b = dynamic_cast<Brass^>(i);
      Console::WriteLine( "{0}\n{1}", b->Name, b->IsValved );
   }
}

int main()
{
   SerializeObject( "Override.xml" );
   DeserializeObject( "Override.xml" );
}

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

public class Orchestra
{
   public Instrument[] Instruments;
}

public class Instrument
{
   public string Name;
}

public class Brass:Instrument{
   public bool IsValved;
}

public class Run
{
    public static void Main()
    {
       Run test = new Run();
       test.SerializeObject("Override.xml");
       test.DeserializeObject("Override.xml");
    }

    public void SerializeObject(string filename)
    {
      // To write the file, a TextWriter is required.
      TextWriter writer = new StreamWriter(filename);

      XmlAttributeOverrides attrOverrides =
         new XmlAttributeOverrides();
      XmlAttributes attrs = new XmlAttributes();

      // Creates an XmlElementAttribute that overrides the Instrument type.
      XmlElementAttribute attr = new
      XmlElementAttribute(typeof(Brass));
      attr.ElementName = "Brass";

      // Adds the element to the collection of elements.
      attrs.XmlElements.Add(attr);
      attrOverrides.Add(typeof(Orchestra), "Instruments", attrs);

      // Creates the XmlSerializer using the XmlAttributeOverrides.
      XmlSerializer s =
      new XmlSerializer(typeof(Orchestra), attrOverrides);

      // Creates the object to serialize.
      Orchestra band = new Orchestra();

      // Creates an object of the derived type.
      Brass i = new Brass();
      i.Name = "Trumpet";
      i.IsValved = true;
      Instrument[] myInstruments = {i};
      band.Instruments = myInstruments;
      s.Serialize(writer,band);
      writer.Close();
   }

   public void DeserializeObject(string filename)
   {
      XmlAttributeOverrides attrOverrides =
         new XmlAttributeOverrides();
      XmlAttributes attrs = new XmlAttributes();

      // Creates an XmlElementAttribute that override the Instrument type.
      XmlElementAttribute attr = new
      XmlElementAttribute(typeof(Brass));
      attr.ElementName = "Brass";

      // Adds the element to the collection of elements.
      attrs.XmlElements.Add(attr);
      attrOverrides.Add(typeof(Orchestra), "Instruments", attrs);

      // Creates the XmlSerializer using the XmlAttributeOverrides.
      XmlSerializer s =
      new XmlSerializer(typeof(Orchestra), attrOverrides);

      FileStream fs = new FileStream(filename, FileMode.Open);
      Orchestra band = (Orchestra) s.Deserialize(fs);
      Console.WriteLine("Brass:");

      /* Deserializing differs from serializing. To read the
         derived-object values, declare an object of the derived
         type (Brass) and cast the Instrument instance to it. */
      Brass b;
      foreach(Instrument i in band.Instruments)
      {
         b= (Brass)i;
         Console.WriteLine(
         b.Name + "\n" +
         b.IsValved);
      }
   }
}

Option Strict
Option Explicit

Imports System.IO
Imports System.Xml.Serialization

Public Class Orchestra
    Public Instruments() As Instrument
End Class

Public Class Instrument
    Public Name As String
End Class

Public Class Brass
    Inherits Instrument
    Public IsValved As Boolean
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(filename As String)
        ' To write the file, a TextWriter is required.
        Dim writer As New StreamWriter(filename)
        
        Dim attrOverrides As New XmlAttributeOverrides()
        Dim attrs As New XmlAttributes()
        
        ' Creates an XmlElementAttribute that overrides the Instrument type.
        Dim attr As New XmlElementAttribute(GetType(Brass))
        attr.ElementName = "Brass"
        
        ' Adds the element to the collection of elements.
        attrs.XmlElements.Add(attr)
        attrOverrides.Add(GetType(Orchestra), "Instruments", attrs)
        
        ' Creates the XmlSerializer using the XmlAttributeOverrides.
        Dim s As New XmlSerializer(GetType(Orchestra), attrOverrides)
        
        ' Creates the object to serialize.
        Dim band As New Orchestra()
        
        ' Creates an object of the derived type.
        Dim i As New Brass()
        i.Name = "Trumpet"
        i.IsValved = True
        Dim myInstruments() As Instrument = {i}
        band.Instruments = myInstruments
        s.Serialize(writer, band)
        writer.Close()
    End Sub
    
    
    Public Sub DeserializeObject(filename As String)
        Dim attrOverrides As New XmlAttributeOverrides()
        Dim attrs As New XmlAttributes()
        
        ' Create an XmlElementAttribute that override the Instrument type.
        Dim attr As New XmlElementAttribute(GetType(Brass))
        attr.ElementName = "Brass"
        
        ' Add the element to the collection of elements.
        attrs.XmlElements.Add(attr)
        attrOverrides.Add(GetType(Orchestra), "Instruments", attrs)
        
        ' Create the XmlSerializer using the XmlAttributeOverrides.
        Dim s As New XmlSerializer(GetType(Orchestra), attrOverrides)
        
        Dim fs As New FileStream(filename, FileMode.Open)
        Dim band As Orchestra = CType(s.Deserialize(fs), Orchestra)
        Console.WriteLine("Brass:")
        
        ' Deserializing differs from serializing. To read the
        ' derived-object values, declare an object of the derived
        ' type (Brass) and cast the Instrument instance to it. 
        Dim b As Brass
        Dim i As Instrument
        For Each i In  band.Instruments
            b = CType(i, Brass)
            Console.WriteLine((b.Name + ControlChars.Cr + b.IsValved.ToString()))
        Next i
    End Sub
End Class

Hinweise

Gilt für

Teilen über

XmlElementAttribute Konstruktoren

Definition

Überlädt

XmlElementAttribute()

Beispiele

Gilt für

XmlElementAttribute(String)

Parameter

Beispiele

Hinweise

Gilt für

XmlElementAttribute(Type)

Parameter

Beispiele

Hinweise

Gilt für

XmlElementAttribute(String, Type)

Parameter

Beispiele

Hinweise

Gilt für

Zusätzliche Ressourcen