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XmlAttributes.Xmlns Property

Gets or sets a value that specifies whether to keep all namespace declarations when an object containing a member that returns an XmlSerializerNamespaces object is overridden.

Namespace:  System.Xml.Serialization
Assembly:  System.Xml (in System.Xml.dll)

'Declaration
Public Property Xmlns As Boolean
'Usage
Dim instance As XmlAttributes 
Dim value As Boolean 

value = instance.Xmlns

instance.Xmlns = value

Property Value

Type: System.Boolean
true if the namespace declarations should be kept; otherwise, false.

The following example contains a class named Student. The class contains a member named MyNamespaces that returns an XmlSerializerNamespaces object. The example creates an XmlAttributes object that is added to an instance of the XmlAttributeOverrides class. The Xmlns property is set to true, which instructs the XmlSerializer to preserve the namespaces when the serialization of the Student object is overridden.

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

Public Class Student
   <XmlAttributeAttribute()> _
   Public Name As String

   <XmlNamespaceDeclarationsAttribute()> _   
   Public myNamespaces As XmlSerializerNamespaces
End Class 'Student


Public Class Run

   Public Shared Sub Main()
      Dim test As New Run()
      test.SerializeStudent("Student_v.xml")
      test.DeserializeStudent("Student_v.xml")
   End Sub  


   Public Sub SerializeStudent(filename As String)
      Dim atts As New XmlAttributes()
      ' Set to true to preserve namespaces, or false to ignore them.
      atts.Xmlns = True 

      Dim xover As New XmlAttributeOverrides()
      ' Add the XmlAttributes and specify the name of  
      ' the element containing namespaces.
      xover.Add(GetType(Student), "myNamespaces", atts)
      ' Create the XmlSerializer using the  
      ' XmlAttributeOverrides object. 
      Dim xser As New XmlSerializer(GetType(Student), xover)

      Dim myStudent As New Student()
      Dim ns As New XmlSerializerNamespaces()
      ns.Add("myns1", "http://www.cpandl.com")
      ns.Add("myns2", "http://www.cohowinery.com")
      myStudent.myNamespaces = ns
      myStudent.Name = "Student1" 

      Dim fs As New FileStream(filename, FileMode.Create)

      xser.Serialize(fs, myStudent)
      fs.Close()
   End Sub  

   Private Sub DeserializeStudent(filename As String)
      Dim atts As New XmlAttributes()
      ' Set to true to preserve namespaces, or false to ignore them.
      atts.Xmlns = True 

      Dim xover As New XmlAttributeOverrides()
      ' Add the XmlAttributes and specify the name  
      ' of the element containing namespaces.
      xover.Add(GetType(Student), "myNamespaces", atts)

      ' Create the XmlSerializer using the  
      ' XmlAttributeOverrides object. 
      Dim xser As New XmlSerializer(GetType(Student), xover)

      Dim fs As New FileStream(filename, FileMode.Open)

      Dim myStudent As Student
      myStudent = CType(xser.Deserialize(fs), Student)
      fs.Close()

      ' Use the ToArray method to get an array  
      ' of XmlQualifiedName objects. 
      Dim qNames As XmlQualifiedName() = _
           myStudent.myNamespaces.ToArray()
      Dim i As Integer 
      For i = 0 To qNames.Length - 1
         Console.WriteLine("{0}:{1}", _
              qNames(i).Name, qNames(i).Namespace)
      Next i
   End Sub  
End Class
#using <mscorlib.dll>
#using <System.dll>
#using <System.Xml.dll>

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

public __gc class Student
{
public:
   [XmlAttributeAttribute]
   String* Name;

   [XmlNamespaceDeclarationsAttribute]
   XmlSerializerNamespaces* myNamespaces;

};

void SerializeStudent(String* filename);
void DeserializeStudent(String* filename);

int main()
{
   SerializeStudent(S"Student.xml");
   DeserializeStudent(S"Student.xml");
}

void SerializeStudent(String* filename)
{
   XmlAttributes* atts = new XmlAttributes();
   // Set to true to preserve namespaces, 
   // or false to ignore them.
   atts->Xmlns=true;

   XmlAttributeOverrides* xover = new XmlAttributeOverrides();
   // Add the XmlAttributes and specify the name of the element 
   // containing namespaces.
   xover->Add(__typeof(Student),S"myNamespaces", atts);
   // Create the XmlSerializer using the 
   // XmlAttributeOverrides object.
   XmlSerializer* xser = new XmlSerializer(__typeof (Student),xover);

   Student* myStudent = new Student();
   XmlSerializerNamespaces* ns = new XmlSerializerNamespaces();
   ns->Add(S"myns1", S"http://www.cpandl.com");
   ns->Add(S"myns2", S"http://www.cohowinery.com");
   myStudent->myNamespaces= ns;
   myStudent->Name= S"Student1";

   FileStream* fs = new FileStream(filename,FileMode::Create);

   xser->Serialize(fs,myStudent);
   fs->Close();
}

void DeserializeStudent(String* filename)
{
   XmlAttributes* atts = new XmlAttributes();
   // Set to true to preserve namespaces, or false to ignore them.
   atts->Xmlns=true;

   XmlAttributeOverrides* xover = new XmlAttributeOverrides();
   // Add the XmlAttributes and specify the name of the 
   // element containing namespaces.
   xover->Add(__typeof(Student),S"myNamespaces", atts);

   // Create the XmlSerializer using the 
   // XmlAttributeOverrides object.
   XmlSerializer* xser = 
      new XmlSerializer(__typeof (Student),xover);

   FileStream* fs = new FileStream(filename,FileMode::Open);

   Student* myStudent;
   myStudent= __try_cast<Student*>( xser->Deserialize( fs ));
   fs->Close();

   // Use the ToArray method to get an array of 
   // XmlQualifiedName objects.
   XmlQualifiedName* qNames[]= myStudent->myNamespaces->ToArray();
   for(int i = 0; i < qNames->Length; i++)
   {
      Console::WriteLine( S"{0}:{1}", qNames[i]->Name, qNames[i]->Namespace );
   }
}

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0

XNA Framework

Supported in: 3.0, 2.0, 1.0

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