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copied!<p>You mentioned using json2.js to stringify your data, but the POSTed data appears to be URLEncoded JSON You may have already seen it, but <a href="http://encosia.com/asmx-scriptservice-mistake-invalid-json-primitive/">this post about the invalid JSON primitive</a> covers why the JSON is being URLEncoded.</p> <p>I'd <a href="http://encosia.com/asp-net-web-services-mistake-manual-json-serialization/">advise <em>against</em> passing a raw, manually-serialized JSON string into your method</a>. ASP.NET is going to automatically JSON deserialize the request's POST data, so if you're manually serializing and sending a JSON string to ASP.NET, you'll actually end up having to JSON serialize your JSON serialized string.</p> <p>I'd suggest something more along these lines:</p> <pre><code>var markers = [{ "position": "128.3657142857143", "markerPosition": "7" }, { "position": "235.1944023323615", "markerPosition": "19" }, { "position": "42.5978231292517", "markerPosition": "-3" }]; $.ajax({ type: "POST", url: "/webservices/PodcastService.asmx/CreateMarkers", // The key needs to match your method's input parameter (case-sensitive). data: JSON.stringify({ Markers: markers }), contentType: "application/json; charset=utf-8", dataType: "json", success: function(data){alert(data);}, failure: function(errMsg) { alert(errMsg); } }); </code></pre> <p>The key to avoiding the invalid JSON primitive issue is to pass jQuery a JSON string for the <code>data</code> parameter, not a JavaScript object, so that jQuery doesn't attempt to URLEncode your data.</p> <p>On the server-side, match your method's input parameters to the shape of the data you're passing in:</p> <pre><code>public class Marker { public decimal position { get; set; } public int markerPosition { get; set; } } [WebMethod] public string CreateMarkers(List<Marker> Markers) { return "Received " + Markers.Count + " markers."; } </code></pre> <p>You can also accept an array, like <code>Marker[] Markers</code>, if you prefer. The deserializer that ASMX ScriptServices uses (JavaScriptSerializer) is pretty flexible, and will do what it can to convert your input data into the server-side type you specify.</p>

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