XmlTextAttribute Classe

Définition

public ref class XmlTextAttribute : Attribute

[System.AttributeUsage(System.AttributeTargets.Field | System.AttributeTargets.Parameter | System.AttributeTargets.Property | System.AttributeTargets.ReturnValue)]
public class XmlTextAttribute : Attribute

[<System.AttributeUsage(System.AttributeTargets.Field | System.AttributeTargets.Parameter | System.AttributeTargets.Property | System.AttributeTargets.ReturnValue)>]
type XmlTextAttribute = class
    inherit Attribute

Public Class XmlTextAttribute
Inherits Attribute

Héritage

Object

Attribute

XmlTextAttribute

Attributs

AttributeUsageAttribute

Exemples

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

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

public ref class Group1
{
public:

   // The XmlTextAttribute with type set to string informs the 
   // XmlSerializer that strings should be serialized as XML text.

   [XmlText(String::typeid)]
   [XmlElement(Int32::typeid)]
   [XmlElement(Double::typeid)]
   array<Object^>^All;
   Group1()
   {
      array<Object^>^temp = {321,"One",2,3.0,"Two"};
      All = temp;
   }
};

public enum class GroupType
{
   Small, Medium, Large
};

public ref class Group2
{
public:

   [XmlText(Type=GroupType::typeid)]
   GroupType Type;
};

public ref class Group3
{
public:

   [XmlText(Type=DateTime::typeid)]
   DateTime CreationTime;
   Group3()
   {
      CreationTime = DateTime::Now;
   }
};

public ref class Test
{
public:
   static void main()
   {
      Test^ t = gcnew Test;
      t->SerializeArray( "XmlText1.xml" );
      t->SerializeEnum( "XmlText2.xml" );
      t->SerializeDateTime( "XmlText3.xml" );
   }

private:
   void SerializeArray( String^ filename )
   {
      XmlSerializer^ ser = gcnew XmlSerializer( Group1::typeid );
      Group1^ myGroup1 = gcnew Group1;
      TextWriter^ writer = gcnew StreamWriter( filename );
      ser->Serialize( writer, myGroup1 );
      writer->Close();
   }

   void SerializeEnum( String^ filename )
   {
      XmlSerializer^ ser = gcnew XmlSerializer( Group2::typeid );
      Group2^ myGroup = gcnew Group2;
      myGroup->Type = GroupType::Medium;
      TextWriter^ writer = gcnew StreamWriter( filename );
      ser->Serialize( writer, myGroup );
      writer->Close();
   }

   void SerializeDateTime( String^ filename )
   {
      XmlSerializer^ ser = gcnew XmlSerializer( Group3::typeid );
      Group3^ myGroup = gcnew Group3;
      TextWriter^ writer = gcnew StreamWriter( filename );
      ser->Serialize( writer, myGroup );
      writer->Close();
   }
};

int main()
{
   Test::main();
}

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

public class Group1{
   // The XmlTextAttribute with type set to string informs the
   // XmlSerializer that strings should be serialized as XML text.
   [XmlText(typeof(string))]
   [XmlElement(typeof(int))]
   [XmlElement(typeof(double))]
   public object [] All= new object []{321, "One", 2, 3.0, "Two" };
}

public class Group2{
   [XmlText(Type = typeof(GroupType))]
   public GroupType Type;
}
public enum GroupType{
   Small,
   Medium,
   Large
}

public class Group3{
   [XmlText(Type=typeof(DateTime))]
   public DateTime CreationTime = DateTime.Now;
}

public class Test{
   static void Main(){
      Test t = new Test();
      t.SerializeArray("XmlText1.xml");
      t.SerializeEnum("XmlText2.xml");
      t.SerializeDateTime("XmlText3.xml");
   }

   private void SerializeArray(string filename){
      XmlSerializer ser = new XmlSerializer(typeof(Group1));
      Group1 myGroup1 = new Group1();

      TextWriter writer = new StreamWriter(filename);

      ser.Serialize(writer, myGroup1);
      writer.Close();
   }

   private void SerializeEnum(string filename){
      XmlSerializer ser = new XmlSerializer(typeof(Group2));
      Group2 myGroup = new Group2();
      myGroup.Type = GroupType.Medium;
      TextWriter writer = new StreamWriter(filename);

      ser.Serialize(writer, myGroup);
      writer.Close();
   }

   private void SerializeDateTime(string filename){
      XmlSerializer ser = new XmlSerializer(typeof(Group3));
      Group3 myGroup = new Group3();
      TextWriter writer = new StreamWriter(filename);

      ser.Serialize(writer, myGroup);
      writer.Close();
   }
}

Imports System.Xml.Serialization
Imports System.IO


Public Class Group1
   ' The XmlTextAttribute with type set to String informs the 
   ' XmlSerializer that strings should be serialized as XML text.
   <XmlText(GetType(String)), _
   XmlElement(GetType(integer)), _  
   XmlElement(GetType(double))> _
   public All () As Object = _
   New Object (){321, "One", 2, 3.0, "Two" }
End Class


Public Class Group2
   <XmlText(GetType(GroupType))> _
   public Type As GroupType 
End Class

Public Enum GroupType
   Small
   Medium
   Large
End Enum

Public Class Group3
   <XmlText(GetType(DateTime))> _
   Public CreationTime As DateTime = DateTime.Now
End Class

Public Class Test
   Shared Sub Main()
      Dim t As Test = New Test()
      t.SerializeArray("XmlText1.xml")
      t.SerializeEnum("XmlText2.xml")
      t.SerializeDateTime("XmlText3.xml")
   End Sub

   Private Sub SerializeArray(filename As String)
      Dim ser As XmlSerializer = New XmlSerializer(GetType(Group1))
      Dim myGroup1 As Group1 = New Group1()

      Dim writer As TextWriter = New StreamWriter(filename)

      ser.Serialize(writer, myGroup1)
      writer.Close()
   End Sub

   Private Sub SerializeEnum(filename As String)
      Dim ser As XmlSerializer = New XmlSerializer(GetType(Group2))
      Dim myGroup As Group2 = New Group2()
      myGroup.Type = GroupType.Medium
      Dim writer As TextWriter = New StreamWriter(filename)

      ser.Serialize(writer, myGroup)
      writer.Close()
   End Sub

   Private Sub SerializeDateTime(filename As String)
      Dim ser As XmlSerializer = new XmlSerializer(GetType(Group3))
      Dim myGroup As Group3 = new Group3()
      Dim writer As TextWriter = new StreamWriter(filename)

      ser.Serialize(writer, myGroup)
      writer.Close()
   End Sub
End Class

Remarques

Il XmlTextAttribute appartient à une famille d’attributs qui contrôle la façon dont le XmlSerializer sérialise et désérialise un objet (par le biais de ses méthodes et Deserialize de ses Serialize méthodes). Pour obtenir la liste complète des attributs similaires, consultez Attributs qui contrôlent la sérialisation XML.

Une seule instance de la XmlTextAttribute classe peut être appliquée dans une classe.

Vous pouvez appliquer les XmlTextAttribute champs publics et les propriétés publiques en lecture/écriture qui retournent des types primitifs et d’énumération.

Vous pouvez appliquer le XmlTextAttribute champ ou la propriété qui retourne un tableau de chaînes. Vous pouvez également appliquer l’attribut à un tableau de type Object , mais vous devez définir la Type propriété sur chaîne. Dans ce cas, toutes les chaînes insérées dans le tableau sont sérialisées en tant que texte XML.

Il XmlTextAttribute peut également être appliqué à un champ qui retourne un XmlNode tableau d’objets ou un tableau d’objets XmlNode .

Par défaut, la XmlSerializer sérialise un membre de classe en tant qu’élément XML. Toutefois, si vous appliquez le XmlTextAttribute membre, il XmlSerializer convertit sa valeur en texte XML. Cela signifie que la valeur est encodée dans le contenu d’un élément XML.

L’outil XML Schema Definition Tool (Xsd.exe) génère occasionnellement les classes lors de la XmlTextAttribute création de classes à partir d’un fichier XSD (XML Schema Definition). Cela se produit lorsque le schéma contient un complexType contenu mixte ; dans ce cas, la classe correspondante contient un membre qui retourne un tableau de chaînes auquel l’application XmlTextAttribute est appliquée. Par exemple, lorsque l’outil Xml Schema Definition traite ce schéma :

<xs:schema attributeFormDefault="qualified" elementFormDefault="qualified" targetNamespace=""   
xmlns:xs="http://www.w3.org/2001/XMLSchema">  
  <xs:element name="LinkList" type="LinkList" />  
  <xs:complexType name="LinkList" mixed="true">  
    <xs:sequence>  
      <xs:element minOccurs="1" maxOccurs="1" name="id" type="xs:int" />  
      <xs:element minOccurs="0" maxOccurs="1" name="name" type="xs:string" />  
      <xs:element minOccurs="0" maxOccurs="1" name="next" type="LinkList" />  
    </xs:sequence>  
  </xs:complexType>  
</xs:schema>  

la classe suivante est générée (des espaces supplémentaires et des remarques ont été supprimés) :

[System.CodeDom.Compiler.GeneratedCodeAttribute("xsd", "2.0.50727.42")]
[System.SerializableAttribute()]
[System.Diagnostics.DebuggerStepThroughAttribute()]
[System.ComponentModel.DesignerCategoryAttribute("code")]
[System.Xml.Serialization.XmlRootAttribute(Namespace = "", IsNullable = false)]
public partial class LinkList
{

    private int idField;
    private string nameField;
    private LinkList nextField;
    private string[] textField;

    public int id
    {
        get
        {
            return this.idField;
        }
        set
        {
            this.idField = value;
        }
    }

    public string name
    {
        get
        {
            return this.nameField;
        }
        set
        {
            this.nameField = value;
        }
    }

    public LinkList next
    {
        get
        {
            return this.nextField;
        }
        set
        {
            this.nextField = value;
        }
    }

    [System.Xml.Serialization.XmlTextAttribute()]
    public string[] Text
    {
        get
        {
            return this.textField;
        }
        set
        {
            this.textField = value;
        }
    }
}

<System.CodeDom.Compiler.GeneratedCodeAttribute("xsd", "2.0.50727.42"), _
 System.SerializableAttribute(), _
 System.Diagnostics.DebuggerStepThroughAttribute(), _
 System.ComponentModel.DesignerCategoryAttribute("code"), _
 System.Xml.Serialization.XmlRootAttribute([Namespace]:="", IsNullable:=False)> _
Partial Public Class LinkList
    Private idField As Integer
    Private nameField As String
    Private nextField As LinkList
    Private textField() As String
    Public Property id() As Integer
        Get
            Return Me.idField
        End Get
        Set(ByVal value As Integer)
            Me.idField = value
        End Set
    End Property
    Public Property name() As String
        Get
            Return Me.nameField
        End Get
        Set(ByVal value As String)
            Me.nameField = value
        End Set
    End Property
    Public Property [next]() As LinkList
        Get
            Return Me.nextField
        End Get
        Set(ByVal value As LinkList)
            Me.nextField = value
        End Set
    End Property
    <System.Xml.Serialization.XmlTextAttribute()> _
    Public Property Text() As String()
        Get
            Return Me.textField
        End Get
        Set(ByVal value As String())
            Me.textField = value
        End Set
    End Property
End Class

Pour plus d’informations sur l’utilisation d’attributs, consultez Attributs.

Constructeurs

Propriétés

Méthodes

Implémentations d’interfaces explicites

S’applique à

Voir aussi

• XmlAttributeOverrides
• XmlAttributes
• XmlSerializer
• XmlText
• Introduction à la sérialisation XML
• Comment : spécifier un nom d'élément différent pour un flux XML
• Contrôle de la sérialisation XML à l'aide d'attributs
• Exemples de sérialisation XML
• Outil XML Schema Definition (Xsd.exe)