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copied!<p>You seem to be using ASMX (not WCF) because you have omitted <code>[DataMember]</code> attributes on all your public properties and still get serialized. WCF is "opt-in", so you shouldn't be seeing any serialization of any properly.</p> <p>As a result, all <code>[DataContract]</code> attributes are useless.</p> <p>ASMX defaults to the JavaScriptSerializer if you are using ScriptManger and outputing JSON. The JavaScriptSerializer is "opt-out" (which means that all public properties are automatically serialized unless marked with <code>[ScriptIgnoreAttribute]</code>).</p> <p>The JavaScriptSerializer supports serializing List<>'s. You should not be having problems serializing your TestCol property because JavaScriptSerializer automatically supports serializing all types that implement IEnumerable (but not IDictionary) -- which includes List<> -- into JSON arrays.</p> <p>Your error seems to be that the JavaScriptSerializer does not properly handle classes that <em>inherit</em> from List<> (or from a class implementing IEnumerable). In your first work-around, you eliminated the class that inherited from List<>. In your second work-around, you skipped all functionalities of the base class, but re-implemented the List<> in a property.</p> <p>Your JSON post data currently looks like:</p> <pre><code>{ Components: [ { Name:"foo" }, { Name:"bar" }, : ] } </code></pre> <p>However, you have one extra level or redirection in the serializer (inheriting from <code>List<Test></code> -> <code>TestCol</code>). It is possible that the serializer is looking for:</p> <pre><code>{ Components: { Items: [ { Name:"foo" }, { Name:"bar" }, : ] } } </code></pre> <p>because you are essentially serializing the "Items" property of List<>. So, your JSON post data is just feeding Test objects to the wrong place, and your TestCol Components property ends up empty.</p> <p>I'd suggest that you add a web service method to output a test MainTest object to see what it serializes into. You'll probably find that it puts in an additional level.</p>

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