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    <p>You must disambiguate your methods by having two different action names. </p> <p>What you can do to have a RESTful API is to create your own <code>RouteHandler</code> class which will change the routing, dependent on whether or not the {id} value is present. The RouteHandler class is simple:</p> <pre><code>using System.Web.Mvc; using System.Web.Routing; public class MyRouteHandler : IRouteHandler { public IHttpHandler GetHttpHandler(RequestContext requestContext) { var routeData = requestContext.RouteData; if (routeData.Values("id").ToString() == "0" /* our default invalid value */ ) { var action = routeData.Values("action"); routeData.Values("action") = action + "Add"; } var handler = new MvcHandler(requestContext); return handler; } } </code></pre> <p>Next, modify <code>RegisterRoutes()</code> in Global.asax.cs as follows:</p> <pre><code> public static void RegisterRoutes(RouteCollection routes) { routes.IgnoreRoute("{resource}.axd/{*pathInfo}"); AreaRegistration.RegisterAllAreas(); routes.Add("Default", new Route("{controller}/{action}/{id}", new RouteValueDictionary( new { controller = "Home", action = "Index", id = "0" /* our default invalid value */ }), new MyRouteHandler())); } </code></pre> <p>Finally, change the <code>ActionName</code> attribute for your Add method to "IndexAdd". When the request comes in without an id, the default invalid value will be supplied, which will alert your RouteHandler to change the method to your "Add" method.</p> <p>counsellorben</p>
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    1. POWhy are these two Actions considered ambiguous despite the parameters being different?
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