XmlArrayItemAttribute.DataType 屬性

參考

定義

命名空間:: System.Xml.Serialization

組件:: System.Xml.XmlSerializer.dll

組件:: System.Xml.dll

組件:: netstandard.dll

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

取得或設定產生的 XML 項目的 XML 資料型別。

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

屬性值

String

XML 架構定義 (XSD) 資料類型。

範例

下列範例會序列化名為的 PurchaseOrder 類別。類別的 XmlArrayItemAttribute 數個實例會套用至三個成員，而 DataType 每個實例的屬性會設定為數組中允許的類型。

#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

備註

下表列出 XML 架構單一資料型別及其 .NET 對等專案。

對於 XML 架構 base64Binary 和 hexBinary 資料類型，請使用物件的陣列 Byte ，並視需要套用 XmlArrayItemAttribute DataType 屬性設定為「base64Binary」或「hexBinary」的。對於 XML 架構 time 和資料類型，請使用 DateTime 型別，並將設定為「date」或「time」的套用 XmlArrayItemAttribute DataType 。 date

針對對應至字串的每個 XML 架構類型，請套用 XmlArrayItemAttribute 其 DataType 屬性設定為 XML 架構類型的。不過，這不會變更序列化格式，只會變更成員的架構。

注意

屬性會區分大小寫，因此您必須將它完全設定為其中一個 XML 架構資料類型。

注意

將二進位資料當做 XML 元素傳遞會更有效率，然後將它當做 XML 屬性傳遞。

如需 XML 架構資料類型的詳細資訊，請參閱全球資訊網協會檔 XML 架構第 2 部分：資料類型。

XSD 資料類型	.NET 資料類型
anyURI	String
base64Binary	Byte物件的陣列
boolean	Boolean
byte	SByte
日期	DateTime
dateTime	DateTime
decimal	Decimal
double	Double
ENTITY	String
實體	String
FLOAT	Single
gDay	String
gMonth	String
gMonthDay	String
gYear	String
gYearMonth	String
hexBinary	Byte物件的陣列
ID	String
IDREF	String
IDREFS	String
int	Int32
整數	String
語言	String
long	Int64
名稱	String
NCName	String
negativeInteger	String
NMTOKEN	String
NMTOKENS	String
normalizedString	String
nonNegativeInteger	String
nonPositiveInteger	String
NOTATION	String
positiveInteger	String
QName	XmlQualifiedName
duration	String
字串	String
short	Int16
time	DateTime
token	String
unsignedByte	Byte
unsignedInt	UInt32
unsignedLong	UInt64
unsignedShort	UInt16

適用於

共用方式為

XmlArrayItemAttribute.DataType 屬性

定義

屬性值

範例

備註

適用於

其他資源