XmlSerializer.Serialize Method (XmlWriter, Object, XmlSerializerNamespaces)


Serializes the specified Object and writes the XML document to a file using the specified XmlWriter and references the specified namespaces.

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

public void Serialize(
	XmlWriter xmlWriter,
	object o,
	XmlSerializerNamespaces namespaces


Type: System.Xml.XmlWriter

The XmlWriter used to write the XML document.

Type: System.Object

The Object to serialize.

Type: System.Xml.Serialization.XmlSerializerNamespaces

The XmlSerializerNamespaces referenced by the object.

Exception Condition

An error occurred during serialization. The original exception is available using the InnerException property.

When the Serialize method is invoked, the public fields and read/write properties of an object are converted into XML. Methods, indexers, private fields, and read-only properties are not serialized. To serialize all fields and properties, both public and private, use the BinaryFormatter.

Use the xmlWriter parameter to specify an object that derives from the abstract XmlWriter class, which is designed to write XML documents. The XmlTextWriter derives from the XmlWriter.


The XmlSerializer cannot serialize the following: arrays of ArrayList and arrays of List<T>.

The following example serializes an object with an XmlWriter. The example also creates an XmlSerializerNamespaces and adds two namespaces to the object. Several instances of the XmlElementAttribute class are applied to the class members to specify the namespace for each element.

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

// This is the class that will be serialized.
public class OrderedItem
   [XmlElement(Namespace = "http://www.cpandl.com")]
   public string ItemName;
   [XmlElement(Namespace = "http://www.cpandl.com")]
   public string Description;
   public decimal UnitPrice;
   [XmlElement(Namespace = "http://www.cpandl.com")]
   public int Quantity;
   public decimal LineTotal;
   // A custom method used to calculate price per item.
   public void Calculate()
      LineTotal = UnitPrice * Quantity;

public class Test{
   public static void Main()
      Test t = new Test();
   // Write a purchase order.

   private void SerializeObject(string filename)
      Console.WriteLine("Writing With XmlTextWriter");

      XmlSerializer serializer = 
      new XmlSerializer(typeof(OrderedItem));
      OrderedItem i = new OrderedItem();
      i.ItemName = "Widget";
      i.Description = "Regular Widget";
      i.Quantity = 10;
      i.UnitPrice = (decimal) 2.30;

      // Create an XmlSerializerNamespaces object.
      XmlSerializerNamespaces ns = 
      new XmlSerializerNamespaces();
      // Add two namespaces with prefixes.
      ns.Add("inventory", "http://www.cpandl.com");
      ns.Add("money", "http://www.cohowinery.com");
      // Create an XmlTextWriter using a FileStream.
      Stream fs = new FileStream(filename, FileMode.Create);
      XmlWriter writer = 
      new XmlTextWriter(fs, new UTF8Encoding());
      // Serialize using the XmlTextWriter.
      serializer.Serialize(writer, i, ns);

<?xml version="1.0"?>
 <OrderedItem xmlns:inventory="http://www.cpandl.com" xmlns:money="http://www.cohowinery.com">
   <inventory:Description>Regular Widget</inventory:Description>

Universal Windows Platform
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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