MVC Controller Action string parameter always null

Question

Hi,

I've created an MVC web app using .NET Core 3.1. In the startup.cs I added the following route (before the default route):
endpoints.MapControllerRoute(
name: "getById",
pattern: "{controller}/{ equityID:alpha}",
defaults: new { controller = "Home", action = "Index",equityID = "CSCO" });

and in the stock controller I have the following action method:

        public async Task<ActionResult> Index([FromRoute(Name = "equityID")] string equityID)
{        {

            if (string.IsNullOrEmpty(equityID))
            { throw new ArgumentNullException("The equity ID is invalid - null or empty"); }

            var client = new IntrinioClient();
            var result = await client.GetRealtimePrice(equityID);
            var model = new StockViewModel() { Quote = result };

}
            return View("~/Views/Stock/Index.cshtml", model);
        }

The issue I'm having is that the equityID passed to the (ndex() action is always null. I can only get it to work by adding equityID = "CSCO" in the defaults of the route definition (but obviously that is not a viable solution). Have I missed something in the setup of the route or elsewhere? Any help would be very appreciated.

Thanks in Advance,
Dan

Answer 1

Hi @Dan ,

Change your route template like below, and the request url should be https://localhost:portNumber/Home/Index/YourequityID :

endpoints.MapControllerRoute(  
    name: "getById",  
    pattern: "{controller}/{action}/{equityID:alpha}");  

Note:
Your providing code contains empty space( pattern: "{controller}/{ equityID:alpha}",
), be sure there is no empty space before equityID:alpha.

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Rena