ASP.NET Core 3 MVC Routing parameters not working

Question

Feel like I'm doing something silly here, I'm playing around with ASP.NET Core 3 (MVC), doing some tutorials, getting familiar - and I'm having some issues specially with routing.

I have the below code in my Startup.cs attempting to setup a route of Main/Home/{team}.

    public void ConfigureServices(IServiceCollection services)
    {
        services.AddControllersWithViews(mvc => mvc.EnableEndpointRouting = true)
        .AddNewtonsoftJson(options =>
                        options.SerializerSettings.ContractResolver = new DefaultContractResolver()
        )
        .AddRazorRuntimeCompilation();
        services.AddKendo();
    }

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseBrowserLink();
            app.UseDeveloperExceptionPage();
        }
        else
        {
            app.UseExceptionHandler("/Error");
        }
        app.UseStaticFiles();

        app.UseRouting();

        app.UseAuthorization();

        app.UseEndpoints(endpoints =>
        {
            endpoints.MapControllers();

            endpoints.MapControllerRoute(
                name: "team",
                pattern: "Main/Home/{team}");

            //endpoints.MapControllerRoute(
            //    name: "default",
            //    pattern: "{controller=Main}/{action=Home}/{id?}");
        });
    }

On my Main controller. The action Home has a single parameter of team

public class MainController : Controller
{
    private readonly ILogger<MainController> _logger;

    public MainController(ILogger<MainController> logger)
    {
        _logger = logger;
    }

    public IActionResult Home(string team)
    {

        TeamModel model = new TeamModel(team);
        return View(model);
    }
}

No matter what I do, I cannot get the team parameter to come through correctly as a route value. The below configuration gives me a 404 every time, no matter the URL (/Main/Home/MyTeam or /Main/Home?team=MyTeam). Other scenarios either give me the above issue, or the team parameter comes through with a null value..

Any help would be great - I think am probably doing something a stupid!

Answer 1

The way you add your endpoint do not have the controller and action that will be called for this route.

You can do something like this:

app.UseEndpoints(endpoints =>
{
    endpoints.MapControllers();

    endpoints.MapControllerRoute(
        name: "team",
        pattern: "Main/Home/{team?}",
        defaults: new { controller = "Main", action = "Home" });

        //endpoints.MapControllerRoute(
        //    name: "default",
        //    pattern: "{controller=Main}/{action=Home}/{id?}");
    });