XmlArrayItemAttribute.Type Vlastnost

Definice

Získá nebo nastaví typ povolený v poli.

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

Hodnota vlastnosti

Type

To Type je povolené v poli.

Příklady

Následující příklad serializuje pole objektů. Pole, které vrací pole, je přiřazeno dvěma XmlArrayItemAttribute instancemi. Každá instance dává pokyn XmlSerializer k přijetí zadaného Type v poli.

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

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

public ref class Person
{
public:
   String^ Name;
};

public ref class Manager: public Person
{
public:
   int Rank;
};

public ref class Group
{
public:

   /* The Type property instructs the XmlSerializer to accept both
      the Person and Manager types in the array. */

   [XmlArrayItem(Type=Manager::typeid),
   XmlArrayItem(Type=Person::typeid)]
   array<Person^>^Staff;
};

void SerializeOrder( String^ filename )
{
   // Creates an XmlSerializer.
   XmlSerializer^ xSer = gcnew XmlSerializer( Group::typeid );

   // Creates the Group object, and two array items.
   Group^ myGroup = gcnew Group;
   Person^ p1 = gcnew Person;
   p1->Name = "Jacki";
   Manager^ p2 = gcnew Manager;
   p2->Name = "Megan";
   p2->Rank = 2;
   array<Person^>^myStaff = {p1,p2};
   myGroup->Staff = myStaff;
   
   // Serializes the object, and closes the StreamWriter.
   TextWriter^ writer = gcnew StreamWriter( filename );
   xSer->Serialize( writer, myGroup );
}

int main()
{
   SerializeOrder( "TypeEx.xml" );
}
using System;
using System.IO;
using System.Xml.Serialization;

public class Group
{
   /* The Type property instructs the XmlSerializer to accept both
   the Person and Manager types in the array. */
   [XmlArrayItem(Type = typeof(Manager)),
   XmlArrayItem(Type=typeof(Person))]
   public Person[]Staff;
}

public class Person
{
   public string Name;
}

public class Manager:Person
{
   public int Rank;
}

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

   public void SerializeOrder(string filename)
   {
      // Creates an XmlSerializer.
      XmlSerializer xSer =
      new XmlSerializer(typeof(Group));

      // Creates the Group object, and two array items.
      Group myGroup = new Group();

      Person p1 = new Person();
      p1.Name = "Jacki";
      Manager p2 = new Manager();

      p2.Name = "Megan";
      p2.Rank = 2;

      Person [] myStaff = {p1,p2};
      myGroup.Staff = myStaff;

      // Serializes the object, and closes the StreamWriter.
      TextWriter writer = new StreamWriter(filename);
      xSer.Serialize(writer, myGroup);
   }
}
Imports System.IO
Imports System.Xml.Serialization



Public Class Group
    ' The Type property instructs the XmlSerializer to accept both
    ' the Person and Manager types in the array. 
    <XmlArrayItem(Type := GetType(Manager)), _
     XmlArrayItem(Type := GetType(Person))> _
    Public Staff() As Person
        
End Class


Public Class Person
    Public Name As String
End Class 


Public Class Manager
    Inherits Person
    Public Rank As Integer
End Class 


Public Class Run
    
    Public Shared Sub Main()
        Dim test As New Run()
        test.SerializeOrder("TypeEx.xml")
    End Sub 
        
    
    Public Sub SerializeOrder(filename As String)
        ' Creates an XmlSerializer.
        Dim xSer As New XmlSerializer(GetType(Group))
        
        ' Creates the Group object, and two array items.
        Dim myGroup As New Group()
        
        Dim p1 As New Person()
        p1.Name = "Jacki"
        Dim p2 As New Manager()
        
        p2.Name = "Megan"
        p2.Rank = 2
        
        Dim myStaff() As Person =  {p1, p2}
        myGroup.Staff = myStaff
        
        ' Serializes the object, and closes the StreamWriter.
        Dim writer As New StreamWriter(filename)
        xSer.Serialize(writer, myGroup)
    End Sub 
End Class

Poznámky

Type Vlastnost použijte k určení přepsáného typu pro veřejné pole nebo veřejnou hodnotu vlastnosti pro čtení a zápis.

Pokud pole nebo vlastnost vrátí pole typu Object, použijte více instancí XmlArrayItemAttribute pole pole nebo vlastnosti. Pro každou instanci nastavte Type vlastnost na typ objektu, který lze vložit do pole.

Pokud pole obsahuje pouze primitivní typy, není nutné použít XmlArrayItemAttribute. Ve výchozím nastavení generuje XmlSerializer řadu prvků, z nichž každý má stejný název elementu pro každou hodnotu, ale typ každého prvku je nastaven na datový typ schématu XML. Například následující kód:

' Visual Basic code  
Public Class Arrays  
   Public XSDTypes ()As Object= New Object(){"one", 2, 3.0}  
End Class  
// C# code  
public class MyArray{  
   // No XmlArrayItemAttribute is applied.  
   public object[] XSDTypes= new object[]{"one", 2, 3.2};  
}  

výsledky v tomto XML:

<?xml version="1.0" encoding="utf-8"?>  
<Arrays xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">  
  <XSDTypes>  
    <Object xsi:type="xsd:string">one</Object>  
    <Object xsi:type="xsd:int">2</Object>  
    <Object xsi:type="xsd:double">3</Object>  
  </XSDTypes>  
</Arrays>  

Pokud však zadáte Type vlastnost pro každý primitivní typ, název elementu pro každou hodnotu se vygeneruje pomocí názvu typu .NET. Například tento kód:

' Visual Basic code  
Public Class Arrays  
   <XmlArrayItem(GetType(String)), _  
   XmlArrayItem(GetType(Integer)), _  
   XmlArrayItem(GetType(Double))> _  
   Public PrimitiveTypes () As Object = New Object(){"one", 2, 3.0}  
End Class  
// C# code  
public class Arrays{  
   [XmlArrayItem(typeof(string))]  
   [XmlArrayItem(typeof(int))]  
   [XmlArrayItem(typeof(double))]  
   public object [] PrimitiveTypes = new object[]{"one", 2, 3.0};  
}  

výsledky v tomto XML:

<?xml version="1.0" encoding="utf-8"?>  
<Arrays xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">  
  <PrimitiveTypes>  
    <string>one</string>  
    <int>2</int>  
    <double>3</double>  
  </PrimitiveTypes>  
</Arrays>  

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