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    <p>I know this is well after the question has been answered, but I'm using a different approach as I am using dependency injection to instantiate my controllers.</p> <p>I have replaced the IActionInvoker ( by injecting the controller's ControllerActionInvoker Property ) with a version that overrides the InvokeActionMethod method.</p> <p>This means no change to controller inheritance and it can be easily removed when I upgrade to MVC4 by altering the DI container's registration for ALL controllers</p> <pre><code>public class JsonNetActionInvoker : ControllerActionInvoker { protected override ActionResult InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary&lt;string, object&gt; parameters) { ActionResult invokeActionMethod = base.InvokeActionMethod(controllerContext, actionDescriptor, parameters); if ( invokeActionMethod.GetType() == typeof(JsonResult) ) { return new JsonNetResult(invokeActionMethod as JsonResult); } return invokeActionMethod; } private class JsonNetResult : JsonResult { public JsonNetResult() { this.ContentType = "application/json"; } public JsonNetResult( JsonResult existing ) { this.ContentEncoding = existing.ContentEncoding; this.ContentType = !string.IsNullOrWhiteSpace(existing.ContentType) ? existing.ContentType : "application/json"; this.Data = existing.Data; this.JsonRequestBehavior = existing.JsonRequestBehavior; } public override void ExecuteResult(ControllerContext context) { if (context == null) { throw new ArgumentNullException("context"); } if ((this.JsonRequestBehavior == JsonRequestBehavior.DenyGet) &amp;&amp; string.Equals(context.HttpContext.Request.HttpMethod, "GET", StringComparison.OrdinalIgnoreCase)) { base.ExecuteResult(context); // Delegate back to allow the default exception to be thrown } HttpResponseBase response = context.HttpContext.Response; response.ContentType = this.ContentType; if (this.ContentEncoding != null) { response.ContentEncoding = this.ContentEncoding; } if (this.Data != null) { // Replace with your favourite serializer. new Newtonsoft.Json.JsonSerializer().Serialize( response.Output, this.Data ); } } } } </code></pre> <p>--- EDIT - Updated to show container registration for controllers. I'm using Unity here.</p> <pre><code>private void RegisterAllControllers(List&lt;Type&gt; exportedTypes) { this.rootContainer.RegisterType&lt;IActionInvoker, JsonNetActionInvoker&gt;(); Func&lt;Type, bool&gt; isIController = typeof(IController).IsAssignableFrom; Func&lt;Type, bool&gt; isIHttpController = typeof(IHttpController).IsAssignableFrom; foreach (Type controllerType in exportedTypes.Where(isIController)) { this.rootContainer.RegisterType( typeof(IController), controllerType, controllerType.Name.Replace("Controller", string.Empty), new InjectionProperty("ActionInvoker") ); } foreach (Type controllerType in exportedTypes.Where(isIHttpController)) { this.rootContainer.RegisterType(typeof(IHttpController), controllerType, controllerType.Name); } } public class UnityControllerFactory : System.Web.Mvc.IControllerFactory, System.Web.Http.Dispatcher.IHttpControllerActivator { readonly IUnityContainer container; public UnityControllerFactory(IUnityContainer container) { this.container = container; } IController System.Web.Mvc.IControllerFactory.CreateController(System.Web.Routing.RequestContext requestContext, string controllerName) { return this.container.Resolve&lt;IController&gt;(controllerName); } SessionStateBehavior System.Web.Mvc.IControllerFactory.GetControllerSessionBehavior(RequestContext requestContext, string controllerName) { return SessionStateBehavior.Required; } void System.Web.Mvc.IControllerFactory.ReleaseController(IController controller) { } IHttpController IHttpControllerActivator.Create(HttpRequestMessage request, HttpControllerDescriptor controllerDescriptor, Type controllerType) { return this.container.Resolve&lt;IHttpController&gt;(controllerType.Name); } } </code></pre>
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    1. POUsing JSON.NET as the default JSON serializer in ASP.NET MVC 3 - is it possible?
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    1. CO+1 for "unobtrusive" solution.
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    2. CONice, but how do you use it? Or better how did you inject it?
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    3. COadded more implementation
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