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    <p>I just discovered this. <code>XmlSerialier</code> looks for a <code>XXXSpecified</code> boolean property to determine if it should be included. This should solve the problem nicely.</p> <pre><code>[Serializable] public class MyClass { public int Age { get; set; } [XmlIgnore] public bool AgeSpecified { get { return Age &gt;= 0; } } public int MyClassB { get; set; } } [Serializable] public class MyClassB { public int RandomNumber { get; set; } } </code></pre> <p>Proof:</p> <pre><code>static string Serialize&lt;T&gt;(T obj) { var serializer = new XmlSerializer(typeof(T)); var builder = new StringBuilder(); using (var writer = new StringWriter(builder)) { serializer.Serialize(writer, obj); return builder.ToString(); } } static void Main(string[] args) { var withoutAge = new MyClass() { Age = -1 }; var withAge = new MyClass() { Age = 20 }; Serialize(withoutAge); // = &lt;MyClass&gt;&lt;MyClassB&gt;0&lt;/MyClassB&gt;&lt;/MyClass&gt; Serialize(withAge); // = &lt;MyClass&gt;&lt;Age&gt;20&lt;/Age&gt;&lt;MyClassB&gt;0&lt;/MyClassB&gt;&lt;/MyClass&gt; } </code></pre> <hr /> <p><strong>Edit</strong>: Yes, it is a documented feature. See the <a href="http://msdn.microsoft.com/en-us/library/system.xml.serialization.xmlserializer.aspx" rel="noreferrer">MSDN entry for <code>XmlSerializer</code></a></p> <blockquote> <p>Another option is to use a special pattern to create a Boolean field recognized by the XmlSerializer, and to apply the XmlIgnoreAttribute to the field. The pattern is created in the form of propertyNameSpecified. For example, if there is a field named "MyFirstName" you would also create a field named "MyFirstNameSpecified" that instructs the XmlSerializer whether to generate the XML element named "MyFirstName".</p> </blockquote>
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    1. POHow to make a value type nullable with .NET XmlSerializer?
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    1. USSamuel
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    1. POHow to make a value type nullable with .NET XmlSerializer?
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    1. CO+1 that is a neat trick! Do you know if it's an undocumented feature or if it's fully supported?
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    2. CO@James that has been there before nullable, so it should work well :) I used it some time ago, and didn't run into any issues.
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      1. USeglasius
    3. COBut is it a documented (and hence, supported) feature?
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