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copied!<p>the autocomplete control will post a json object to "servicePath/serviceMethod" so first, set the <code>servicePath</code> to your controller and the <code>serviceMethod</code> option to your action name. </p> <p>then define this class: </p> <pre><code>public class AutoCompleteRequest { public string PrefixText { get; set; } public int Count { get; set; } } </code></pre> <p>because thats the json object the autocomplete control posts to your controller. </p> <p>then define a JsonModelBinder: </p> <pre><code>public class JsonBinderAttribute : CustomModelBinderAttribute { public override IModelBinder GetBinder() { return new JsonModelBinder(); } public class JsonModelBinder : IModelBinder { public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext) { try { var inputStream = controllerContext.HttpContext.Request.InputStream; using (var sr = new StreamReader(inputStream)) { var json = sr.ReadToEnd(); return JsonConvert.DeserializeObject(json, bindingContext.ModelType); } } catch { return null; } } } } </code></pre> <p>this one is using Json.Net as deserializer. </p> <p>then define your action like this: </p> <pre><code> public virtual JsonResult SearchA([JsonBinder]AutoCompleteRequest post) { var data = repository.Query<A>() .Where(s => s.Name.StartsWith(post.PrefixText)) .Take(post.Count) .Select(s => s.Name) .ToArray(); return Json(data); } </code></pre> <p>note how i use the JsonBinderAttribute on the AutoCompleteRequest parameter and how a Json array of strings is returned. </p> <p><em>Edit</em></p> <p>i did a follow up blog post here: <a href="http://devcarl.posterous.com/how-to-use-ajax-library-4-autocomplete-with-a" rel="nofollow noreferrer">http://devcarl.posterous.com/how-to-use-ajax-library-4-autocomplete-with-a</a></p>

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