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copied!<p>Seeing as this question has almost 600 views and no answers I thought I would answer it myself (since I've long since figured it out).</p> <p>Using a <code>ScriptMethod</code> is really not the right way to communicate with jQuery ajax. While it can be done, you will notice what I was doing above is returning a <code>string</code> with data that I encoded myself to JSON using <code>JavascriptSerializer.</code></p> <p>However, using a <code>ScriptMethod</code> automatically incorporates serialization/deserialization designed to communicate with Microsoft's AJAX framework. Since serializing a pure string with no object wrapper will genererally result in the same string (whether I be returning XML or JSON format), it basically worked, but what was really happening internally is it was being serialized <em>twice</em>.</p> <p>So what I should have done, at a minimum, was:</p> <p><code>public List<jsTreeNode> GetChildren(string id)</code></p> <p>that is, the return type should be the actual data type, not a string of serialized data. </p> <p>However, this still wouldn't be exactly right, because Microsoft's methods wrap the return value in an object <code>d</code>. I could still extract that in Javascript to get the inner data. But if something like jsTree is expecting data in a predefined format this may not be workable.</p> <p>The best solution is <strong>do not use WebServices, use generic handlers (ashx) instead.</strong> This gives you complete control over the format and handling of your input and output. It may take a little bit of doing to set yourself up a nice framework, but the frustration of being unable to skip parts of the WebService handling that you don't need makes it well worth it. </p>

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