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    <p>The <code>XmlSerializer</code> doesn't serialize properties which don't have a setter (IIRC it only serializers public properties with both public getter and setters). You have a few options:</p> <ul> <li>Replace the <code>System.Numerics.Complex</code> type with a type which you create (and has a "full" property)</li> <li>Change the <code>MyClass</code> class to handle the serialization (and deserialization) of the complex numbers, via the <code>IXmlSerializable</code> interface.</li> </ul> <p>The second option is shown below.</p> <pre><code>public class StackOverflow_10523009 { public class MyClass : IXmlSerializable { public Complex[] ComplexNumbers; public XmlSchema GetSchema() { return null; } public void ReadXml(XmlReader reader) { reader.ReadStartElement("MyClass"); List&lt;Complex&gt; numbers = new List&lt;Complex&gt;(); while (reader.IsStartElement("Complex")) { Complex c = new Complex( double.Parse(reader.GetAttribute("Real")), double.Parse(reader.GetAttribute("Imaginary"))); numbers.Add(c); reader.Skip(); } reader.ReadEndElement(); this.ComplexNumbers = numbers.ToArray(); } public void WriteXml(XmlWriter writer) { foreach (var complex in ComplexNumbers) { writer.WriteStartElement("Complex"); writer.WriteStartAttribute("Real"); writer.WriteValue(complex.Real); writer.WriteEndAttribute(); writer.WriteStartAttribute("Imaginary"); writer.WriteValue(complex.Imaginary); writer.WriteEndAttribute(); writer.WriteEndElement(); } } public override string ToString() { return "MyClass[" + string.Join(",", ComplexNumbers) + "]"; } } public static void Test() { MyClass mc = new MyClass { ComplexNumbers = new Complex[] { new Complex(3, 4), new Complex(0, 1), new Complex(1, 0) } }; XmlSerializer xs = new XmlSerializer(typeof(MyClass)); MemoryStream ms = new MemoryStream(); xs.Serialize(ms, mc); Console.WriteLine(Encoding.UTF8.GetString(ms.ToArray())); ms.Position = 0; MyClass mc2 = (MyClass)xs.Deserialize(ms); Console.WriteLine(mc2); } } </code></pre>
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