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POHandle Empty String as Null in XML Deserialization
 

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  1. POHandle Empty String as Null in XML Deserialization
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    <p>I have the same problem with regard to <a href="https://stackoverflow.com/questions/644964/when-implementing-ixmlserializable-how-to-only-override-either-readxml-or-writex">this question</a>. I am sending data back and forth with a SOAP-based API where the responses don't follow the standard quite right, specifically with null values. For <code>DateTime</code>, the API will send back an empty string, like this:</p> <pre><code>&lt;nextreview&gt;&lt;/nextreview&gt; </code></pre> <p>Which causes the following error to occur on deserialization:</p> <blockquote> <p>The string '' is not a valid AllXsd value.</p> </blockquote> <p>So my thought was to create a custom Nullable type, <code>NullableOrEmpty&lt;T&gt;</code>, implementing <code>IXMLSerializable</code> that handles empty string by converting it to null. The problem is I only want to handle the exceptional case of an empty string. Everything else I want to serialize and deserialize as normal, using the 'default' behavior. How do I simulate the default behavior of serialization in my code below? </p> <pre><code>public class NullableOrEmpty&lt;T&gt; : IXmlSerializable where T : struct { public T? NullableValue { get; set; } public T Value { get { return this.NullableValue.Value; } } public bool HasValue { get { return this.NullableValue.HasValue; } } ... public void ReadXml(XmlReader reader) { string xml = reader.ReadElementContentAsString(); if (string.IsNullOrEmpty(xml)) { this.NullableValue = null; } else { //THIS SHOULD DO THE DEFAULT. THIS DOESN'T WORK. WHAT DO I DO?? //this.NullableValue = (T?)new XmlSerializer(typeof(T?)).Deserialize(reader); } } public void WriteXml(XmlWriter writer) { //THIS SHOULD DO THE DEFAULT. THIS DOESN'T WORK. WHAT DO I DO?? //new XmlSerializer(typeof(T?)).Serialize(writer, this.NullableValue); } } </code></pre> <p>When I say "THIS DOESN'T WORK", it specifically generates the following error message, probably because it's trying to consume something that isn't there:</p> <blockquote> <p>There is an error in XML document (63, 6).</p> <p><code>&lt;lastreview xmlns=''&gt;</code> was not expected.</p> </blockquote> <p>Here is a snippet of XML at that spot. The error is caused by the value in <code>birthdate</code>, because I'm not consuming it correctly in the non-exceptional case where the value is actually given:</p> <pre><code>&lt;udf4&gt;&lt;/udf4&gt; &lt;udf3&gt;&lt;/udf3&gt; &lt;birthdate&gt;1978-05-24Z&lt;/birthdate&gt; &lt;lastreview&gt;&lt;/lastreview&gt; &lt;fulltime&gt;1&lt;/fulltime&gt; </code></pre> <p>Any thoughts or ideas are appreciated. I can post more code samples if needed or test out suggestions. Thanks!</p>
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    1. COYou can't use the same `XmlReader`. You've already read past the content you want to read again.
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      1. USJohn Saunders
 

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