Serialize Method (Stream, Object, XmlSerializerNamespaces)

XmlSerializer.Serialize Method (Stream, Object, XmlSerializerNamespaces)

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

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

public void Serialize(
	Stream stream,
	Object o,
	XmlSerializerNamespaces namespaces


Type: System.IO.Stream
The Stream used to write the XML document.
Type: System.Object
The Object to serialize.
Type: System.Xml.Serialization.XmlSerializerNamespaces
The XmlSerializerNamespaces referenced by the object.


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 stream parameter to specify an object that derives from the abstract Stream class, which is designed to write to streams. Classes that derive from the Stream class include:


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

The following example serializes an object with a Stream object. The example also creates an XmlSerializerNamespaces and adds two namespaces to the object. The class that defines the serialized object is also attributed with XmlElementAttribute attributes to specify the namespace for each element.

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

// This is the class that will be serialized.
public class OrderedItem {
    [XmlElement(Namespace = "")]
    public string ItemName;
    [XmlElement(Namespace = "")]
    public string Description;
    public decimal UnitPrice;
    [XmlElement(Namespace = "")]
    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 Stream");

        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 prefix-namespace pairs.
        ns.Add("inventory", "");
        ns.Add("money", "");

        // Create a FileStream to write with.
        Stream writer = new FileStream(filename, FileMode.Create);

        // Serialize the object, and close the TextWriter
        serializer.Serialize(writer, i, ns);

    private void DeserializeObject(string filename) {
        Console.WriteLine("Reading with Stream");
        // Create an instance of the XmlSerializer.
        XmlSerializer serializer = new XmlSerializer(typeof(OrderedItem));

        // Writing the file requires a Stream.
        Stream reader= new FileStream(filename,FileMode.Open);

        // Declare an object variable of the type to be deserialized.
        OrderedItem i;

        /* Use the Deserialize method to restore the object's state 
           using data from the XML document. */
        i = (OrderedItem) serializer.Deserialize(reader);

        // Write out the properties of the object.
            i.ItemName + "\t" +
            i.Description + "\t" +
            i.UnitPrice + "\t" +
            i.Quantity + "\t" +

.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.

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