XmlArrayItemAttribute.DataType Eigenschaft

Referenz

Definition

Namespace:: System.Xml.Serialization

Assembly:: System.Xml.XmlSerializer.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.

Ruft den XML-Datentyp des generierten XML-Elements ab oder legt diesen fest.

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

Eigenschaftswert

String

Ein XML-Schemadefinitionsdatentyp (XSD).

Beispiele

Im folgenden Beispiel wird eine Klasse mit dem Namen PurchaseOrder". Mehrere Instanzen der XmlArrayItemAttribute Klasse werden auf drei Member angewendet, und die DataType Eigenschaft für jede Instanz wird auf einen Typ festgelegt, der im Array zulässig ist.

#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

Hinweise

In der folgenden Tabelle sind die einfachen XML-Schema-Datentypen mit ihren .NET-Entsprechungen aufgeführt.

Verwenden Sie für das XML-Schema base64Binary und hexBinary die Datentypen ein Array von Byte Objekten, und wenden Sie eine XmlArrayItemAttribute DataType eigenschaft auf "base64Binary" oder "hexBinary" an, sofern zutreffend. Verwenden Sie für das XML-Schema time und date die Datentypen den DateTime Typ, und wenden Sie den XmlArrayItemAttribute Satz auf DataType "Datum" oder "Uhrzeit" an.

Wenden Sie für jeden XML-Schematyp, der einer Zeichenfolge zugeordnet ist, die Eigenschaft XmlArrayItemAttribute DataType auf den XML-Schematyp an. Dies ändert jedoch nicht das Serialisierungsformat, nur das Schema für das Element.

Hinweis

Die Eigenschaft ist groß- und kleinschreibung, sodass Sie sie genau auf einen der XML-Schemadatentypen festlegen müssen.

Hinweis

Das Übergeben von Binärdaten als XML-Element ist effizienter und wird dann als XML-Attribut übergeben.

Weitere Informationen zu XML-Schemadatentypen finden Sie im XML-Schemateil 2 des World Wide Web Consortium-Dokuments: Datentypen.

XSD-Datentyp	.NET-Datentyp
anyURI	String
base64Binary	Array von Byte-Objekten
boolean	Boolean
byte	SByte
date	DateTime
dateTime	DateTime
Decimal	Decimal
double	Double
ENTITY	String
ENTITÄTEN	String
float	Single
gDay	String
gMonth	String
gMonthDay	String
gYear	String
gYearMonth	String
hexBinary	Array von Byte-Objekten
id	String
IDREF	String
IDREFS	String
INT	Int32
integer	String
language	String
long	Int64
name	String
NCName	String
negativeInteger	String
NMTOKEN	String
NMTOKENS	String
normalizedString	String
nonNegativeInteger	String
nonPositiveInteger	String
NOTATION	String
positiveInteger	String
QName	XmlQualifiedName
duration	String
Zeichenfolge	String
short	Int16
time	DateTime
token	String
unsignedByte	Byte
unsignedInt	UInt32
unsignedLong	UInt64
unsignedShort	UInt16

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