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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

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

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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