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    <p>At last I figured it out!! Thanks for the suggestions everyone! I finally figured out the best solution is to pass JSON via the Http Post and use a custom ModelBinder to convert the JSON to a Dictionary. One thing I did in my solution is created a JsonDictionary object that inherits from Dictionary so that I can attach the custom ModelBinder to the JsonDictionary type, and it wont cause any conflicts in the future if I use Dictionary as a ActionResult parameter later on for a different purpose than JSON.</p> <p>Here's the final ActionResult method:</p> <pre><code>public ActionResult AddItems([Bind(Include="values")] JsonDictionary values) { // do something } </code></pre> <p>And the jQuery "$.post" call:</p> <pre><code>$.post("/Controller/AddItems", { values: Sys.Serialization.JavaScriptSerializer.serialize( { id: 200, "name": "Chris" } ) }, function(data) { }, "json"); </code></pre> <p>Then the JsonDictionaryModelBinder needs to be registered, I added this to the Application_Start method within the Global.asax.cs:</p> <pre><code>protected void Application_Start() { ModelBinders.Binders.Add(typeof(JsonDictionary), new JsonDictionaryModelBinder()); } </code></pre> <p>And, finally here's the JsonDictionaryModelBinder object and JsonDictionary object I created:</p> <pre><code>public class JsonDictionary : Dictionary&lt;string, object&gt; { public JsonDictionary() { } public void Add(JsonDictionary jsonDictionary) { if (jsonDictionary != null) { foreach (var k in jsonDictionary.Keys) { this.Add(k, jsonDictionary[k]); } } } } public class JsonDictionaryModelBinder : IModelBinder { #region IModelBinder Members public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext) { if (bindingContext.Model == null) { bindingContext.Model = new JsonDictionary(); } var model = bindingContext.Model as JsonDictionary; if (bindingContext.ModelType == typeof(JsonDictionary)) { // Deserialize each form/querystring item specified in the "includeProperties" // parameter that was passed to the "UpdateModel" method call // Check/Add Form Collection this.addRequestValues( model, controllerContext.RequestContext.HttpContext.Request.Form, controllerContext, bindingContext); // Check/Add QueryString Collection this.addRequestValues( model, controllerContext.RequestContext.HttpContext.Request.QueryString, controllerContext, bindingContext); } return model; } #endregion private void addRequestValues(JsonDictionary model, NameValueCollection nameValueCollection, ControllerContext controllerContext, ModelBindingContext bindingContext) { foreach (string key in nameValueCollection.Keys) { if (bindingContext.PropertyFilter(key)) { var jsonText = nameValueCollection[key]; var newModel = deserializeJson(jsonText); // Add the new JSON key/value pairs to the Model model.Add(newModel); } } } private JsonDictionary deserializeJson(string json) { // Must Reference "System.Web.Extensions" in order to use the JavaScriptSerializer var serializer = new System.Web.Script.Serialization.JavaScriptSerializer(); return serializer.Deserialize&lt;JsonDictionary&gt;(json); } } </code></pre>
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    1. POHow do I pass a Dictionary as a parameter to an ActionResult method from jQuery/Ajax?
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    1. USChris Pietschmann
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