XmlArrayAttribute.Namespace Proprietà

Riferimento

Definizione

Spazio dei nomi:: System.Xml.Serialization

Assembly:: System.Xml.XmlSerializer.dll

Assembly:: System.Xml.dll

Assembly:: netstandard.dll

Importante

Alcune informazioni sono relative alla release non definitiva del prodotto, che potrebbe subire modifiche significative prima della release definitiva. Microsoft non riconosce alcuna garanzia, espressa o implicita, in merito alle informazioni qui fornite.

Ottiene o imposta lo spazio dei nomi dell'elemento XML.

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

public string Namespace { get; set; }

public string? Namespace { get; set; }

member this.Namespace : string with get, set

Public Property Namespace As String

Valore della proprietà

String

Lo spazio dei nomi dell'elemento XML.

Esempio

L'esempio seguente serializza un'istanza della Library classe che contiene due membri, uno che contiene titoli del libro e un altro che contiene titoli periodici. Anche se entrambi gli elementi XML sono denominati Titles, ognuno contiene un prefisso diverso. L'esempio include anche un'istanza XmlSerializerNamespaces della classe che contiene gli spazi dei nomi e i prefissi usati per qualificare i due nomi di elemento.

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

using namespace System;
using namespace System::IO;
using namespace System::Xml;
using namespace System::Xml::Serialization;
public ref class Book
{
public:
   String^ Title;
   String^ Author;
   String^ ISBN;

   [XmlAttributeAttribute]
   String^ Publisher;
};

public ref class Periodical
{
private:
   String^ title;

public:

   property String^ Title 
   {
      String^ get()
      {
         return title;
      }
      void set( String^ value )
      {
         title = value;
      }
   }
};

public ref class Library
{
private:
   array<Book^>^books;
   array<Periodical^>^periodicals;

public:

   /* This element will be qualified with the prefix 
      that is associated with the namespace http://wwww.cpandl.com. */
   [XmlArray(ElementName="Titles",
   Namespace="http://wwww.cpandl.com")]
   property array<Book^>^ Books 
   {
      array<Book^>^ get()
      {
         return books;
      }
      void set( array<Book^>^value )
      {
         books = value;
      }
   }

   /* This element will be qualified with the prefix that is
      associated with the namespace http://www.proseware.com. */
   [XmlArray(ElementName="Titles",Namespace=
   "http://www.proseware.com")]
   property array<Periodical^>^ Periodicals 
   {
      array<Periodical^>^ get()
      {
         return periodicals;
      }
      void set( array<Periodical^>^value )
      {
         periodicals = value;
      }
   }
};

void WriteBook( String^ filename )
{
   // Creates a new XmlSerializer.
   XmlSerializer^ mySerializer = gcnew XmlSerializer( Library::typeid );

   // Writing the file requires a StreamWriter.
   TextWriter^ myStreamWriter = gcnew StreamWriter( filename );

   /* Creates an XmlSerializerNamespaces and adds prefixes and 
      namespaces to be used. */
   XmlSerializerNamespaces^ myNamespaces = gcnew XmlSerializerNamespaces;
   myNamespaces->Add( "books", "http://wwww.cpandl.com" );
   myNamespaces->Add( "magazines", "http://www.proseware.com" );

   // Creates an instance of the class to be serialized.
   Library^ myLibrary = gcnew Library;

   // Creates two book objects.
   Book^ b1 = gcnew Book;
   b1->Title = "My Book Title";
   b1->Author = "An Author";
   b1->ISBN = "000000000";
   b1->Publisher = "Microsoft Press";
   Book^ b2 = gcnew Book;
   b2->Title = "Another Book Title";
   b2->Author = "Another Author";
   b2->ISBN = "00000001";
   b2->Publisher = "Another Press";

   /* Creates an array using the objects, and sets the Books property
      to the array. */
   array<Book^>^myBooks = {b1,b2};
   myLibrary->Books = myBooks;

   // Creates two Periodical objects.
   Periodical^ per1 = gcnew Periodical;
   per1->Title = "My Magazine Title";
   Periodical^ per2 = gcnew Periodical;
   per2->Title = "Another Magazine Title";

   // Sets the Periodicals property to the array. 
   array<Periodical^>^myPeridocials = {per1,per2};
   myLibrary->Periodicals = myPeridocials;

   // Serializes the myLibrary object.
   mySerializer->Serialize( myStreamWriter, myLibrary, myNamespaces );
   myStreamWriter->Close();
}

void ReadBook( String^ filename )
{
   /* Creates an instance of an XmlSerializer
      with the class used to read the document. */
   XmlSerializer^ mySerializer = gcnew XmlSerializer( Library::typeid );

   // A FileStream is needed to read the file.
   FileStream^ myFileStream = gcnew FileStream( filename,FileMode::Open );
   Library^ myLibrary = dynamic_cast<Library^>(mySerializer->Deserialize( myFileStream ));

   // Reads each book in the array returned by the Books property.      
   for ( int i = 0; i < myLibrary->Books->Length; i++ )
   {
      Console::WriteLine( myLibrary->Books[ i ]->Title );
      Console::WriteLine( myLibrary->Books[ i ]->Author );
      Console::WriteLine( myLibrary->Books[ i ]->ISBN );
      Console::WriteLine( myLibrary->Books[ i ]->Publisher );
      Console::WriteLine();
   }
   for ( int i = 0; i < myLibrary->Periodicals->Length; i++ )
   {
      Console::WriteLine( myLibrary->Periodicals[ i ]->Title );
   }
}

int main()
{
   WriteBook( "MyLibrary.xml" );
   ReadBook( "MyLibrary.xml" );
}

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

public class Library
   {
   private Book[] books;
   private Periodical [] periodicals;
   /* This element will be qualified with the prefix
   that is associated with the namespace http://wwww.cpandl.com. */
   [XmlArray(ElementName = "Titles",
   Namespace="http://wwww.cpandl.com")]
   public Book[] Books
   {
      get{return books;}
      set{books = value;}
   }
   /* This element will be qualified with the prefix that is
   associated with the namespace http://www.proseware.com. */
   [XmlArray(ElementName = "Titles", Namespace =
   "http://www.proseware.com")]
   public Periodical[] Periodicals
   {
      get{return periodicals;}
      set{periodicals = value;}
   }
}

public class Book
{
   public string Title;
   public string Author;
   public string ISBN;
   [XmlAttribute]
   public string Publisher;
}

public class Periodical
{
   private string title;
   public string Title
   {
      get{return title;}
      set{title = value;}
   }
}

public class Run
{
   public static void Main()
   {
      Run test = new Run();
      test.WriteBook("MyLibrary.xml");
      test.ReadBook("MyLibrary.xml");
   }

   public void WriteBook(string filename)
   {
      // Creates a new XmlSerializer.
      XmlSerializer mySerializer = new XmlSerializer(typeof(Library));
      // Writing the file requires a StreamWriter.
      TextWriter myStreamWriter = new StreamWriter(filename);
      /* Creates an XmlSerializerNamespaces and adds prefixes and
      namespaces to be used. */
      XmlSerializerNamespaces myNamespaces =
      new XmlSerializerNamespaces();
      myNamespaces.Add("books", "http://wwww.cpandl.com");
      myNamespaces.Add("magazines", "http://www.proseware.com");
      // Creates an instance of the class to be serialized.
      Library myLibrary = new Library();

      // Creates two book objects.
      Book b1 = new Book();
      b1.Title = "My Book Title";
      b1.Author = "An Author";
      b1.ISBN = "000000000";
      b1.Publisher = "Microsoft Press";

      Book b2 = new Book();
      b2.Title = "Another Book Title";
      b2.Author = "Another Author";
      b2.ISBN = "00000001";
      b2.Publisher = "Another Press";

      /* Creates an array using the objects, and sets the Books property
      to the array. */
      Book[] myBooks = {b1,b2};
      myLibrary.Books = myBooks;

      // Creates two Periodical objects.
      Periodical per1 = new Periodical();
      per1.Title = "My Magazine Title";
      Periodical per2 = new Periodical();
      per2.Title = "Another Magazine Title";

      // Sets the Periodicals property to the array.
      Periodical[] myPeridocials = {per1, per2};
      myLibrary.Periodicals = myPeridocials;

      // Serializes the myLibrary object.
      mySerializer.Serialize(myStreamWriter, myLibrary, myNamespaces);

       myStreamWriter.Close();
    }

   public void ReadBook(string filename)
   {
      /* Creates an instance of an XmlSerializer
      with the class used to read the document. */
      XmlSerializer mySerializer = new XmlSerializer(typeof(Library));
      // A FileStream is needed to read the file.
      FileStream myFileStream = new FileStream(filename, FileMode.Open);

      Library myLibrary = (Library) mySerializer.Deserialize(myFileStream);

      // Reads each book in the array returned by the Books property.
      for(int i = 0; i< myLibrary.Books.Length;i++)
      {
         Console.WriteLine(myLibrary.Books[i].Title);
         Console.WriteLine(myLibrary.Books[i].Author);
         Console.WriteLine(myLibrary.Books[i].ISBN);
         Console.WriteLine(myLibrary.Books[i].Publisher);
         Console.WriteLine();
      }
      // Reads each Periodical returned by the Periodicals property.
      for(int i = 0; i< myLibrary.Periodicals.Length;i++)
      {
         Console.WriteLine(myLibrary.Periodicals[i].Title);
      }
   }
}

Option Explicit
Option Strict

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



Public Class Library
    Private myBooks() As Book
    Private myPeriodicals() As Periodical
    
    ' This element will be qualified with the prefix
    ' that is associated with the namespace http://wwww.cpandl.com.    
    <XmlArray(ElementName := "Titles", _
        Namespace := "http://wwww.cpandl.com")> _ 
    Public Property Books() As Book()
        Get
            Return myBooks
        End Get
        Set
            myBooks = value
        End Set
    End Property

    ' This element will be qualified with the prefix that is
    ' associated with the namespace http://www.proseware.com.    
    <XmlArray(ElementName := "Titles", _
        Namespace := "http://www.proseware.com")> _
    Public Property Periodicals() As Periodical()
        Get
            Return myPeriodicals
        End Get
        Set
            myPeriodicals = value
        End Set
    End Property
End Class
 
Public Class Book
    Public Title As String
    Public Author As String
    Public ISBN As String
    <XmlAttribute()> Public Publisher As String
End Class

Public Class Periodical
    Private myTitle As String
    
    Public Property Title() As String
        Get
            Return myTitle
        End Get
        Set
            myTitle = value
        End Set
    End Property
End Class
 
Public Class Run
    
    Public Shared Sub Main()
        Dim test As New Run()
        test.WriteBook("MyLibrary.xml")
        test.ReadBook("MyLibrary.xml")
    End Sub
    
    
    Public Sub WriteBook(ByVal filename As String)
        ' Creates a new XmlSerializer.
        Dim mySerializer As New XmlSerializer(GetType(Library))
        ' Writing the file requires a StreamWriter.
        Dim myStreamWriter As New StreamWriter(filename)
        ' Creates an XmlSerializerNamespaces and adds prefixes and
        ' namespaces to be used. 
        Dim myNamespaces As New XmlSerializerNamespaces()
        myNamespaces.Add("books", "http://wwww.cpandl.com")
        myNamespaces.Add("magazines", "http://www.proseware.com")
        ' Create an instance of the class to be serialized.
        Dim myLibrary As New Library()
        
        ' Creates two book objects.
        Dim b1 As New Book()
        b1.Title = "My Book Title"
        b1.Author = "An Author"
        b1.ISBN = "000000000"
        b1.Publisher = "Microsoft Press"
        
        Dim b2 As New Book()
        b2.Title = "Another Book Title"
        b2.Author = "Another Author"
        b2.ISBN = "00000001"
        b2.Publisher = "Another Press"
        
        ' Creates an array using the objects, and sets the Books property
        ' to the array. 
        Dim myBooks As Book() =  {b1, b2}
        myLibrary.Books = myBooks
        
        ' Creates two Periodical objects.
        Dim per1 As New Periodical()
        per1.Title = "My Magazine Title"
        Dim per2 As New Periodical()
        per2.Title = "Another Magazine Title"
        
        ' Sets the Periodicals property to the array. 
        Dim myPeriodicals() As Periodical =  {per1, per2}
        myLibrary.Periodicals = myPeriodicals
        
        ' Serializes the myLibrary object.
        mySerializer.Serialize(myStreamWriter, myLibrary, myNamespaces)
        
        myStreamWriter.Close()
    End Sub
    
    
    Public Sub ReadBook(ByVal filename As String)
        ' Creates an instance of an XmlSerializer
        ' with the class used to read the document. 
        Dim mySerializer As New XmlSerializer(GetType(Library))
        
        ' A FileStream is needed to read the file.
        Dim myFileStream As New FileStream(filename, FileMode.Open)
        
        Dim myLibrary As Library = _
            CType(mySerializer.Deserialize(myFileStream), Library)
        
        ' Reads each book in the array returned by the Books property.      
        Dim i As Integer
        For i = 0 To myLibrary.Books.Length - 1
            Console.WriteLine(myLibrary.Books(i).Title)
            Console.WriteLine(myLibrary.Books(i).Author)
            Console.WriteLine(myLibrary.Books(i).ISBN)
            Console.WriteLine(myLibrary.Books(i).Publisher)
            Console.WriteLine()
        Next i
        
        ' Reads each Periodical returned by the Periodicals property.
        For i = 0 To myLibrary.Periodicals.Length - 1
            Console.WriteLine(myLibrary.Periodicals(i).Title)
        Next i
    End Sub
End Class

Commenti

La Namespace proprietà consente di creare nomi di elementi XML qualificati. La Namespace proprietà è conforme alle regole per la creazione di uno spazio dei nomi XML, come indicato nel documento World Wide Web Consortium del 1999 denominato Spazi dei nomi in XML.

Per creare spazi dei nomi associati a un prefisso, è necessario creare un'istanza della XmlSerializerNamespaces classe contenente gli spazi dei nomi e i prefissi usati nel documento XML. Quando si imposta lo spazio dei nomi per ogni XmlArrayAttributeoggetto , deve corrispondere a uno degli spazi dei nomi nell'oggetto XmlSerializerNamespaces. Quando viene generato il codice XML, ogni matrice viene preceduta correttamente dal prefisso associato allo spazio dei nomi specificato.

Si applica a