ActionFilter para converter para Ajax a Action

ReturnPArtialIfAjaxAttribute.cs

public class ReturnPartialIfAjaxAttribute : ActionFilterAttribute
	{
		private readonly string partialViewName;

		public ReturnPartialIfAjaxAttribute(string partialViewName)
		{
			this.partialViewName = partialViewName;
		}

		public override void OnActionExecuted(ActionExecutedContext filterContext)
		{
			if (filterContext.Exception != null || filterContext.Canceled == true)
			{
				return;
			}

			var viewResult = filterContext.Result as ViewResult;

			if (viewResult != null && filterContext.RequestContext.HttpContext.Request.IsAjaxRequest())
			{
				var partialResult = new PartialViewResult();

				partialResult.ViewName = partialViewName;
				partialResult.ViewData.Model = viewResult.Model;

				filterContext.Result = partialResult;
			}
		}
	}