Is there any attribute relating to AJAX to be set for ASP.NET MVC controller actions?

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I don’t think there is built in attribute for ajax, but you can create your own AjaxOnly filter like this:

public class AjaxOnlyAttribute : ActionMethodSelectorAttribute 
{
    public override bool IsValidForRequest(ControllerContext controllerContext, System.Reflection.MethodInfo methodInfo)
    {
        return controllerContext.RequestContext.HttpContext.Request.IsAjaxRequest();
    }
}

And decorate your action methods like this:

[AjaxOnly]
public ActionResult AjaxMethod()
{
   
}

See Also: ASP.NET MVC Action Filter – Ajax Only Attribute for another way of implementing this

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