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    <p>Try</p> <pre><code>[XmlArray] [XmlArrayItem(ElementName="ABCFile", Type=typeof(ABCFile))] [XmlArrayItem(ElementName="XYZFile", Type=typeof(XYZFile))] public List&lt;InputFile&gt; InputFileList { get; set; } </code></pre> <p>This will indicate the serializer that, even though this is a List of InputFile, there will be two derived types that will be stored in this list. It's likely to make it use specific version of methods for each one.</p> <p>If it fail, let me know.</p> <p><strong>Edit based on your comment</strong></p> <p>I don't see how this can be happing.</p> <p>I tested it the following classes:</p> <pre><code>public class InputFile { public String InputfileCommonProperty { get; set; } } public class ABCFile : InputFile { public String ABCSpecificProperty { get; set; } } public class XYZFile : InputFile { public String XYZSpecificProperty { get; set; } } public class InputFileHolder { public InputFileHolder() { InputFileList = new List&lt;InputFile&gt;(); } [XmlArray] [XmlArrayItem(ElementName = "ABCFile", Type = typeof(ABCFile))] [XmlArrayItem(ElementName = "XYZFile", Type = typeof(XYZFile))] public List&lt;InputFile&gt; InputFileList { get; set; } } </code></pre> <p>My main program looks like:</p> <pre><code>static void Main(string[] args) { InputFileHolder fileHolder = new InputFileHolder(); fileHolder.InputFileList.Add( new ABCFile() { InputfileCommonProperty = "This is a common property", ABCSpecificProperty = "This is a class specific property" }); XmlSerializer serializer = new XmlSerializer(typeof(InputFileHolder)); MemoryStream memoryStream = new MemoryStream(); serializer.Serialize(memoryStream, fileHolder); System.Text.UTF8Encoding enc = new System.Text.UTF8Encoding(); String serializedString = enc.GetString(memoryStream.ToArray()); } </code></pre> <p>And in the end, serializedString's content is:</p> <pre><code>&lt;?xml version="1.0"?&gt; &lt;InputFileHolder xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"&gt; &lt;InputFileList&gt; &lt;ABCFile&gt; &lt;InputfileCommonProperty&gt;This is a common property&lt;/InputfileCommonProperty&gt; &lt;ABCSpecificProperty&gt;This is a class specific property&lt;/ABCSpecificProperty&gt; &lt;/ABCFile&gt; &lt;/InputFileList&gt; &lt;/InputFileHolder&gt; </code></pre> <p>You see? The serializer knows it's a ABCFile not a generic InputFile.</p>
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    1. COThank you for the quick response. The XML generated still looks like: <ArrayOfInputFile><InputFile ...><InputFile ...></ArrayOfInputFile>. If I manually edit the XML to change InputFile to ABCFile it fails with bad XML error.
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    2. COTake a look at my code snippet and tell me what happens
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    3. COOk, It think I've discovered the root of the problem. My version of InputFileHolder has an IXmlSerializable interface where I have custom read/write of the parameters to serialize. If I remove the IXmlSerializable interface and let the framework handle it, I get XML like yours, where the object type is specified. I need to have a custom read, so I need to fix the write. I'll add my write code in the main post.
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