XmlArrayItemAttribute.DataType Proprietà

Definizione

Spazio dei nomi:

System.Xml.Serialization

Assembly:

System.Xml.XmlSerializer.dll

Assembly:

System.Xml.dll

Assembly:

netstandard.dll

Ottiene o imposta il tipo di dati XML dell'elemento XML generato.

public:
 property System::String ^ DataType { System::String ^ get(); void set(System::String ^ value); };

public string DataType { get; set; }

member this.DataType : string with get, set

Public Property DataType As String

Valore della proprietà

String

Tipo di dati XSD (XML Schema Definition).

Esempio

Nell'esempio seguente viene serializzata una classe denominata PurchaseOrder. Diverse istanze della XmlArrayItemAttribute classe vengono applicate a tre membri e la DataType proprietà per ogni istanza viene impostata su un tipo consentito nella matrice.

#using <System.dll>
#using <System.xml.dll>

using namespace System;
using namespace System::Collections;
using namespace System::Xml;
using namespace System::Xml::Serialization;
using namespace System::IO;
using namespace System::Xml::Schema;
public ref class Item
{
public:
   String^ ItemID;
   Item(){}

   Item( String^ id )
   {
      ItemID = id;
   }
};

public ref class NewItem: public Item
{
public:
   String^ Category;
   NewItem(){}

   NewItem( String^ id, String^ cat )
   {
      ItemID = id;
      Category = cat;
   }
};

public ref class PurchaseOrder
{
public:

   [XmlArrayItem(DataType="gMonth",
   ElementName="MyMonths",
   Namespace="http://www.cohowinery.com")]
   array<String^>^Months;

   [XmlArrayItem(Item::typeid),XmlArrayItem(NewItem::typeid)]
   array<Item^>^Items;

   [XmlArray(IsNullable=true)]
   [XmlArrayItem(String::typeid),
   XmlArrayItem(Double::typeid),
   XmlArrayItem(NewItem::typeid)]
   array<Object^>^Things;
};

void SerializeObject( String^ filename )
{
   // Create an instance of the XmlSerializer class;
   // specify the type of object to serialize.
   XmlSerializer^ serializer = gcnew XmlSerializer( PurchaseOrder::typeid );
   TextWriter^ writer = gcnew StreamWriter( filename );

   // Create a PurchaseOrder and set its properties.
   PurchaseOrder^ po = gcnew PurchaseOrder;
   array<String^>^months = {"March","May","August"};
   po->Months = months;
   array<Item^>^items = {gcnew Item( "a1" ),gcnew NewItem( "b1","book" )};
   po->Items = items;
   array<Object^>^things = {"String",2003.31,gcnew NewItem( "Item100","book" )};
   po->Things = things;

   // Serialize the purchase order, and close the TextWriter.
   serializer->Serialize( writer, po );
   writer->Close();
}

void DeserializeObject( String^ filename )
{
   // Create an instance of the XmlSerializer class;
   // specify the type of object to be deserialized.
   XmlSerializer^ serializer = gcnew XmlSerializer( PurchaseOrder::typeid );

   // A FileStream is needed to read the XML document.
   FileStream^ fs = gcnew FileStream( filename,FileMode::Open );

   // Declare an object variable of the type to be deserialized.
   PurchaseOrder^ po;

   /* Use the Deserialize method to restore the object's state with
      data from the XML document. */
   po = safe_cast<PurchaseOrder^>(serializer->Deserialize( fs ));
   for ( int i = 0; i < po->Months->Length; ++i )
      Console::WriteLine( po->Months[ i ] );
   for ( int i = 0; i < po->Items->Length; ++i )
      Console::WriteLine( po->Items[ i ]->ItemID );
   for ( int i = 0; i < po->Things->Length; ++i )
      Console::WriteLine( po->Things[ i ] );
}

int main()
{
   // Read and write purchase orders.
   SerializeObject(  "ArrayItemEx.xml" );
   DeserializeObject(  "ArrayItemEx.xml" );
}

using System;
using System.Collections;
using System.Xml;
using System.Xml.Serialization;
using System.IO;
using System.Xml.Schema;
public class PurchaseOrder
{
   [XmlArrayItem(DataType = "gMonth", 
   ElementName="MyMonths",
   Namespace = "http://www.cohowinery.com")]
   public string[] Months;

   [XmlArrayItem(typeof(Item)), XmlArrayItem(typeof(NewItem))]
   public Item[] Items;

   [XmlArray(IsNullable = true)]
   [XmlArrayItem(typeof(string)), 
   XmlArrayItem(typeof(double)), 
   XmlArrayItem(typeof(NewItem))]
   public object[] Things;
   }

public class Item{
   public string ItemID;
   public Item(){}
   public Item(string id){
    ItemID = id;
   }
}
public class NewItem:Item{
   public string Category;
   public NewItem(){}
   public NewItem(string id, string cat){
    this.ItemID = id;
    Category = cat;
    }
}
 
public class Test
{
   public static void Main()
   {
      // Read and write purchase orders.
      Test t = new Test();
      t.SerializeObject("ArrayItemEx.xml");
      t.DeserializeObject("ArrayItemEx.xml");
   } 

   private void SerializeObject(string filename)
   {
      // Create an instance of the XmlSerializer class;
      // specify the type of object to serialize.
      XmlSerializer serializer = 
      new XmlSerializer(typeof(PurchaseOrder));
      TextWriter writer = new StreamWriter(filename);
      // Create a PurchaseOrder and set its properties.
      PurchaseOrder po=new PurchaseOrder();
      po.Months = new string[]{ "March", "May", "August"};
      po.Items= new Item[]{new Item("a1"), new NewItem("b1", "book")};
      po.Things= new object[] {"String", 2003.31, new NewItem("Item100", "book")};
      
      // Serialize the purchase order, and close the TextWriter.
      serializer.Serialize(writer, po);
      writer.Close();
   }
 
   protected void DeserializeObject(string filename)
   {
      // Create an instance of the XmlSerializer class;
      // specify the type of object to be deserialized.
      XmlSerializer serializer = new XmlSerializer(typeof(PurchaseOrder));
   
      // A FileStream is needed to read the XML document.
      FileStream fs = new FileStream(filename, FileMode.Open);
      // Declare an object variable of the type to be deserialized.
      PurchaseOrder po;
      /* Use the Deserialize method to restore the object's state with
      data from the XML document. */
      po = (PurchaseOrder) serializer.Deserialize(fs);
      foreach(string s in po.Months)
          Console.WriteLine(s);
      foreach(Item i in po.Items)
         Console.WriteLine(i.ItemID);
      foreach(object thing in po.Things)
         Console.WriteLine(thing); 
   } 
}

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

Public Class PurchaseOrder
   <XmlArrayItem(DataType:= "gMonth", _
   ElementName:="MyMonths", _
   Namespace:= "http:'www.cohowinery.com")> _
   public Months() As String 

   <XmlArrayItem(GetType(Item)), XmlArrayItem(GetType(NewItem))> _
   public Items () As Item

   <XmlArray(IsNullable:= true), _
   XmlArrayItem(GetType(String)), _
   XmlArrayItem(GetType(double)), _
   XmlArrayItem(GetType(NewItem))> _
   public Things() As Object
End Class

Public Class Item
   public ItemID As String 

   public Sub New()
   End Sub
   
   public Sub New (id As String)
    ItemID = id
   End Sub
End Class

Public Class NewItem
   Inherits Item
   public Category As String 
   
   public Sub New()
      
   End Sub

   public Sub New(id As String , cat As String )
    me.ItemID = id
    Category = cat
   End Sub
End Class
 
Public Class Test
   Shared Sub Main()
      ' Read and write purchase orders.
      Dim t As Test = New Test()
      t.SerializeObject("ArrayItemExVB.xml")
      t.DeserializeObject("ArrayItemExVB.xml")
   End Sub 

   private Sub SerializeObject(filename As String)
      ' Create an instance of the XmlSerializer class
      ' specify the type of object to serialize.
      Dim serializer As XmlSerializer = _
      New XmlSerializer(GetType(PurchaseOrder))
      Dim writer As TextWriter = New StreamWriter(filename)
      ' Create a PurchaseOrder and set its properties.
      Dim po As PurchaseOrder =New PurchaseOrder()
      po.Months = New String() { "March", "May", "August"}
      po.Items= New Item(){New Item("a1"), New NewItem("b1", "book")}
      po.Things= New Object() {"String", 2003.31, New NewItem("Item100", "book")}
      
      ' Serialize the purchase order, and close the TextWriter.
      serializer.Serialize(writer, po)
      writer.Close()
   End Sub
 
   protected Sub DeserializeObject(filename As String)
      ' Create an instance of the XmlSerializer class
      ' specify the type of object to be deserialized.
      Dim serializer As XmlSerializer = _
      New XmlSerializer(GetType(PurchaseOrder))
   
      ' A FileStream is needed to read the XML document.
      Dim fs As FileStream = New FileStream(filename, FileMode.Open)
      ' Declare an object variable of the type to be deserialized.
      Dim po As PurchaseOrder 
      ' Use the Deserialize method to restore the object's state with
      ' data from the XML document. 
      po = CType( serializer.Deserialize(fs), PurchaseOrder)
      Dim s As String
      Dim i As Item
      Dim thing As Object
      for each s in po.Months
          Console.WriteLine(s)
      Next 
      
      for each i in po.Items
         Console.WriteLine(i.ItemID)
      Next 
      
      for each thing in po.Things
         Console.WriteLine(thing) 
      Next
   End Sub
End Class

Commenti

Nella tabella seguente sono elencati i tipi di dati semplici di XML Schema con i relativi equivalenti .NET.

Per xml Schema base64Binary e hexBinary tipi di dati, utilizzare una matrice di Byte oggetti e applicare un XmlArrayItemAttribute oggetto con la DataType proprietà impostata su "base64Binary" o "hexBinary", a seconda delle esigenze. Per xml Schema time e date tipi di dati, usare il DateTime tipo e applicare con XmlArrayItemAttribute il DataType valore impostato su "date" o "time".

Per ogni tipo di XML Schema mappato a una stringa, applicare con la XmlArrayItemAttribute relativa DataType proprietà impostata sul tipo di XML Schema. Tuttavia, questo non modifica il formato di serializzazione, ma solo lo schema per il membro.

Nota

La proprietà fa distinzione tra maiuscole e minuscole, pertanto è necessario impostarla esattamente su uno dei tipi di dati XML Schema.

Nota

Il passaggio di dati binari come elemento XML è più efficiente e quindi passarlo come attributo XML.

Per altre informazioni sui tipi di dati XML Schema, vedere il documento World Wide Web Consortium XML Schema Part 2: Datatypes.

Tipo di dati XSD	Tipo di dati .NET
anyURI	String
base64Binary	Matrice di Byte oggetti
boolean	Boolean
byte	SByte
Data	DateTime
dateTime	DateTime
decimal	Decimal
double	Double
ENTITY	String
ENTITÀ	String
float	Single
gDay	String
gMonth	String
gMonthDay	String
gYear	String
gYearMonth	String
Hexbinary	Matrice di Byte oggetti
ID	String
IDREF	String
IDREFS	String
INT	Int32
numero intero	String
Linguaggio	String
long	Int64
Nome	String
NCName	String
negativeInteger	String
NMTOKEN	String
NMTOKENS	String
normalizedString	String
nonNegativeInteger	String
nonPositiveInteger	String
NOTATION	String
positiveInteger	String
QName	XmlQualifiedName
duration	String
string	String
short	Int16
time	DateTime
token	String
unsignedByte	Byte
unsignedInt	UInt32
unsignedLong	UInt64
unsignedShort	UInt16