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XmlAttributes Class

Represents a collection of attribute objects that control how the XmlSerializer serializes and deserializes an object.

System.Object
  System.Xml.Serialization.XmlAttributes

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

public class XmlAttributes

The XmlAttributes type exposes the following members.

  NameDescription
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryXmlAttributes()Initializes a new instance of the XmlAttributes class.
Public methodSupported by Portable Class LibraryXmlAttributes(ICustomAttributeProvider)Infrastructure. Initializes a new instance of the XmlAttributes class and customizes how the XmlSerializer serializes and deserializes an object.
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  NameDescription
Public propertySupported by the XNA FrameworkXmlAnyAttributeGets or sets the XmlAnyAttributeAttribute to override.
Public propertySupported by the XNA FrameworkSupported by Portable Class LibraryXmlAnyElementsGets the collection of XmlAnyElementAttribute objects to override.
Public propertySupported by the XNA FrameworkSupported by Portable Class LibraryXmlArrayGets or sets an object that specifies how the XmlSerializer serializes a public field or read/write property that returns an array.
Public propertySupported by the XNA FrameworkSupported by Portable Class LibraryXmlArrayItemsGets or sets a collection of objects that specify how the XmlSerializer serializes items inserted into an array returned by a public field or read/write property.
Public propertySupported by the XNA FrameworkSupported by Portable Class LibraryXmlAttributeGets or sets an object that specifies how the XmlSerializer serializes a public field or public read/write property as an XML attribute.
Public propertySupported by the XNA FrameworkSupported by Portable Class LibraryXmlChoiceIdentifierGets or sets an object that allows you to distinguish between a set of choices.
Public propertySupported by the XNA FrameworkSupported by Portable Class LibraryXmlDefaultValueGets or sets the default value of an XML element or attribute.
Public propertySupported by the XNA FrameworkSupported by Portable Class LibraryXmlElementsGets a collection of objects that specify how the XmlSerializer serializes a public field or read/write property as an XML element.
Public propertySupported by the XNA FrameworkSupported by Portable Class LibraryXmlEnumGets or sets an object that specifies how the XmlSerializer serializes an enumeration member.
Public propertySupported by the XNA FrameworkSupported by Portable Class LibraryXmlIgnoreGets or sets a value that specifies whether or not the XmlSerializer serializes a public field or public read/write property.
Public propertySupported by the XNA FrameworkSupported by Portable Class LibraryXmlnsGets 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.
Public propertySupported by the XNA FrameworkSupported by Portable Class LibraryXmlRootGets or sets an object that specifies how the XmlSerializer serializes a class as an XML root element.
Public propertySupported by the XNA FrameworkSupported by Portable Class LibraryXmlTextGets or sets an object that instructs the XmlSerializer to serialize a public field or public read/write property as XML text.
Public propertySupported by the XNA FrameworkSupported by Portable Class LibraryXmlTypeGets or sets an object that specifies how the XmlSerializer serializes a class to which the XmlTypeAttribute has been applied.
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  NameDescription
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryEquals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodSupported by the XNA FrameworkSupported by Portable Class LibraryFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryGetTypeGets the Type of the current instance. (Inherited from Object.)
Protected methodSupported by the XNA FrameworkSupported by Portable Class LibraryMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryToStringReturns a string that represents the current object. (Inherited from Object.)
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Creating the XmlAttributes is part of a process that overrides the default way the XmlSerializer serializes class instances. For example, suppose you want to serialize an object that is created from a DLL which has an inaccessible source. By using the XmlAttributeOverrides, you can augment or otherwise control how the object is serialized.

The members of the XmlAttributes class correspond directly to a family of attribute classes that control serialization. For example, the XmlText property must be set to an XmlTextAttribute, which allows you to override serialization of a field or property by instructing the XmlSerializer to serialize the property value as XML text. For a complete list of attributes that control serialization, see the XmlSerializer.

For more details on using the XmlAttributeOverrides with the XmlAttributes class, see How to: Specify an Alternate Element Name for an XML Stream.

The following example serializes an instance of a class named Orchestra, which contains a single field named Instruments that returns an array of Instrument objects. A second class named Brass inherits from the Instrument class. The example creates an XmlAttributes object to override the Instrument field--allowing the field to accept Brass objects--and adds the XmlAttributes object to an instance of the XmlAttributeOverrides class.


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

public class Orchestra
{
   public Instrument[] Instruments;
}   

public class Instrument
{
   public string Name;
}

public class Brass:Instrument
{
   public bool IsValved;
}

public class Run
{
    public static void Main()
    {
       Run test = new Run();
       test.SerializeObject("Override.xml");
       test.DeserializeObject("Override.xml");
    }

    public void SerializeObject(string filename)
    {
      /* Each overridden field, property, or type requires 
      an XmlAttributes object. */
      XmlAttributes attrs = new XmlAttributes();

      /* Create an XmlElementAttribute to override the 
      field that returns Instrument objects. The overridden field
      returns Brass objects instead. */
      XmlElementAttribute attr = new XmlElementAttribute();
      attr.ElementName = "Brass";
      attr.Type = typeof(Brass);

      // Add the element to the collection of elements.
      attrs.XmlElements.Add(attr);

      // Create the XmlAttributeOverrides object.
      XmlAttributeOverrides attrOverrides = new XmlAttributeOverrides();

      /* Add the type of the class that contains the overridden 
      member and the XmlAttributes to override it with to the 
      XmlAttributeOverrides object. */
      attrOverrides.Add(typeof(Orchestra), "Instruments", attrs);

      // Create the XmlSerializer using the XmlAttributeOverrides.
      XmlSerializer s = 
      new XmlSerializer(typeof(Orchestra), attrOverrides);

      // Writing the file requires a TextWriter.
      TextWriter writer = new StreamWriter(filename);

      // Create the object that will be serialized.
      Orchestra band = new Orchestra();

      // Create an object of the derived type.
      Brass i = new Brass();
      i.Name = "Trumpet";
      i.IsValved = true;
      Instrument[] myInstruments = {i};
      band.Instruments = myInstruments;

      // Serialize the object.
      s.Serialize(writer,band);
      writer.Close();
   }

   public void DeserializeObject(string filename)
   {
      XmlAttributeOverrides attrOverrides = 
         new XmlAttributeOverrides();
      XmlAttributes attrs = new XmlAttributes();

      // Create an XmlElementAttribute to override the Instrument.
      XmlElementAttribute attr = new XmlElementAttribute();
      attr.ElementName = "Brass";
      attr.Type = typeof(Brass);

      // Add the element to the collection of elements.
      attrs.XmlElements.Add(attr);

      attrOverrides.Add(typeof(Orchestra), "Instruments", attrs);

      // Create the XmlSerializer using the XmlAttributeOverrides.
      XmlSerializer s = 
      new XmlSerializer(typeof(Orchestra), attrOverrides);

      FileStream fs = new FileStream(filename, FileMode.Open);
      Orchestra band = (Orchestra) s.Deserialize(fs);
      Console.WriteLine("Brass:");

      /* The difference between deserializing the overridden 
      XML document and serializing it is this: To read the derived 
      object values, you must declare an object of the derived type 
      (Brass), and cast the Instrument instance to it. */
      Brass b;
      foreach(Instrument i in band.Instruments) 
      {
         b = (Brass)i;
         Console.WriteLine(
         b.Name + "\n" + 
         b.IsValved);
      }
   }
}



.NET Framework

Supported in: 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

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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