XmlElementAttribute.Type Proprietà

Definizione

Spazio dei nomi:

System.Xml.Serialization

Assembly:

System.Xml.XmlSerializer.dll

Assembly:

System.Xml.ReaderWriter.dll

Assembly:

System.Xml.dll

Assembly:

netstandard.dll

Ottiene o imposta il tipo di oggetto utilizzato per rappresentare l'elemento XML.

public:
 property Type ^ Type { Type ^ get(); void set(Type ^ value); };

public Type Type { get; set; }

public Type? Type { get; set; }

member this.Type : Type with get, set

Public Property Type As Type

Valore della proprietà

Type

Il Type del membro.

Esempio

Nell'esempio seguente viene utilizzata la Type proprietà per specificare un oggetto derivato per un oggetto XmlElementAttribute. L'esempio applica anche tre istanze di XmlElementAttribute a un campo che restituisce un oggetto ArrayList. Ogni istanza specifica un tipo consentito nel campo .

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

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

public ref class Manager: public Employee
{
public:
   int Level;
};

public ref class Group
{
public:

   [XmlElement(Manager::typeid)]
   array<Employee^>^Staff;

   [XmlElement(Int32::typeid),
   XmlElement(String::typeid),
   XmlElement(DateTime::typeid)]
   ArrayList^ ExtraInfo;
};

void SerializeObject( String^ filename )
{
   // Create an XmlSerializer instance.
   XmlSerializer^ xSer = gcnew XmlSerializer( Group::typeid );

   // Create object and serialize it.
   Group^ myGroup = gcnew Group;
   Manager^ e1 = gcnew Manager;
   e1->Name = "Manager1";
   Manager^ m1 = gcnew Manager;
   m1->Name = "Manager2";
   m1->Level = 4;
   array<Employee^>^emps = {e1,m1};
   myGroup->Staff = emps;
   myGroup->ExtraInfo = gcnew ArrayList;
   myGroup->ExtraInfo->Add( ".NET" );
   myGroup->ExtraInfo->Add( 42 );
   myGroup->ExtraInfo->Add( DateTime(2001,1,1) );
   TextWriter^ writer = gcnew StreamWriter( filename );
   xSer->Serialize( writer, myGroup );
   writer->Close();
}

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

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

public class Group
{
   [XmlElement(typeof(Manager))]
   public Employee [] Staff;

   [XmlElement (typeof(int)),
   XmlElement (typeof(string)),
   XmlElement (typeof(DateTime))]
   public ArrayList ExtraInfo;
}

public class Employee
{
   public string Name;
}

public class Manager:Employee
{
   public int Level;
}

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

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

      // Create object and serialize it.
      Group myGroup = new Group();

      Manager e1 = new Manager();
      e1.Name = "Manager1";
      Manager m1 =  new Manager();
      m1.Name = "Manager2";
      m1.Level = 4;

      Employee[] emps = {e1, m1};
      myGroup.Staff = emps;

      myGroup.ExtraInfo = new ArrayList();
      myGroup.ExtraInfo.Add(".NET");
      myGroup.ExtraInfo.Add(42);
      myGroup.ExtraInfo.Add(new DateTime(2001,1,1));

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

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


Public Class Group
    <XmlElement(GetType(Manager))> _    
    Public Staff() As Employee
    
    <XmlElement(GetType(Integer)), _
     XmlElement(GetType(String)), _
     XmlElement(GetType(DateTime))> _
    Public ExtraInfo As ArrayList
End Class

Public Class Employee
    Public Name As String
End Class

Public Class Manager
    Inherits Employee
    Public Level As Integer
End Class

Public Class Run
    
    Public Shared Sub Main()
        Dim test As New Run()
        test.SerializeObject("TypeEx.xml")
    End Sub    
    
    Public Sub SerializeObject(filename As String)
        ' Create an XmlSerializer instance.
        Dim xSer As New XmlSerializer(GetType(Group))
        
        ' Create an object and serialize it.
        Dim myGroup As New Group()
        
        Dim e1 As New Manager()
        e1.Name = "Manager1"
        Dim m1 As New Manager()
        m1.Name = "Manager2"
        m1.Level = 4
        
        Dim emps() As Employee = {e1, m1}
        myGroup.Staff = emps
        
        myGroup.ExtraInfo = New ArrayList()
        myGroup.ExtraInfo.Add(".NET")
        myGroup.ExtraInfo.Add(42)
        myGroup.ExtraInfo.Add(New DateTime(2001, 1, 1))
        
        Dim writer As New StreamWriter(filename)
        xSer.Serialize(writer, myGroup)
        writer.Close()
    End Sub
End Class

Commenti

Utilizzare la Type proprietà per specificare un tipo derivato per un campo o una proprietà.

Se un campo o una proprietà restituisce un ArrayListoggetto , è possibile applicare più istanze di XmlElementAttribute al membro. Per ogni istanza, impostare la Type proprietà su un tipo di oggetto che può essere inserito nella matrice.