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PODeserialization problem with DataContractJsonSerializer
 

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    <p>I've got the following piece of JSON:</p> <pre><code>[{ "name": "numToRetrieve", "value": "3", "label": "Number of items to retrieve:", "items": { "1": "1", "3": "3", "5": "5" }, "rules": { "range": "1-2" } }, { "name": "showFoo", "value": "on", "label": "Show foo?" }, { "name": "title", "value": "Foo", "label": "Foo:" }] </code></pre> <p>All in one line version (suitable for a string literal):</p> <pre><code>[{\"name\":\"numToRetrieve\",\"value\":\"3\",\"label\":\"Number of items to retrieve:\",\"items\":{\"1\":\"1\",\"3\":\"3\",\"5\":\"5\"},\"rules\":{\"range\":\"1-2\"}},{\"name\":\"showFoo\",\"value\":\"on\",\"label\":\"Show foo?\"},{\"name\":\"title\",\"value\":\"Foo\",\"label\":\"Foo:\"}] </code></pre> <p>In the above example, <code>name</code>, <code>value</code>, and <code>label</code> are required but <code>items</code> and <code>rules</code> are optional.</p> <p>Here's the class I'm trying to deserialize into:</p> <pre><code>using System.Collections; using System.Collections.Generic; using System.Runtime.Serialization; namespace foofoo { [DataContract] public sealed class FooDef { [DataMember(Name = "name", IsRequired = true)] public string Name { get; set; } [DataMember(Name = "value", IsRequired = true)] public string Value { get; set; } [DataMember(Name = "label", IsRequired = true)] public string Label { get; set; } [DataMember(Name = "items", IsRequired = false)] public Dictionary&lt;string, string&gt; Items { get; set; } [DataMember(Name = "rules", IsRequired = false)] public Dictionary&lt;string, string&gt; Rules { get; set; } } } </code></pre> <p>Here's the code I use to deserialize:</p> <pre><code>var json = new DataContractJsonSerializer(typeof(List&lt;FooDef&gt;)); var bar = "[{\"name\":\"numToRetrieve\",\"value\":\"3\",\"label\":\"Number of items to retrieve:\",\"items\":{\"1\":\"1\",\"3\":\"3\",\"5\":\"5\"},\"rules\":{\"range\":\"1-2\"}},{\"name\":\"showFoo\",\"value\":\"on\",\"label\":\"Show foo?\"},{\"name\":\"title\",\"value\":\"Foo\",\"label\":\"Foo:\"}]"; var stream = new MemoryStream(Encoding.UTF8.GetBytes(bar)); var foo = json.ReadObject(stream); stream.Close(); </code></pre> <p>Everything goes reasonably well except that <code>items</code> and <code>rules</code> are empty for the first <code>FooDef</code> pass. I have tried everything under the sun to try and get them populated: custom classes, <code>NameValueCollection</code>, <code>KeyValuePair&lt;string, string&gt;</code>, <code>List</code> of both of the latter, and every other collection that seemed to apply. [EDIT: I forgot to try <code>Hashtable</code>, which seemed like an obvious candidate. Didn't work.]</p> <p>The problem, as I see it, is that the key piece under <code>items</code> and <code>rules</code> is open-ended. That is, it's not always going to be called <code>range</code> or <code>3</code>. Any advice or ideas?</p>
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