1 . Create an attribute filter AjaxChildActionOnlyAttribute and override IsValidForRequest() method.
namespace Website.AttributeFilters
{
public class AjaxChildActionOnlyAttribute : ActionMethodSelectorAttribute
{
public override bool IsValidForRequest(ControllerContext controllerContext, System.Reflection.MethodInfo methodInfo)
{
return controllerContext.RequestContext.HttpContext.Request.IsAjaxRequest() || controllerContext.IsChildAction;
}
}
}
2 . Add the newly created custom attribute to the child action.
[AttributeFilters.AjaxChildActionOnly]
public PartialViewResult AsyncWidget()
{
return PartialView("_AsyncWidget");
}