INavigationTreeBuilder isn't created with navigation.json

[matthewblott]

Basically as the title says. I have everything working okay but when I try and use a navigation.json instead the site crashes on the home page with a NullReferenceException for INavigationTreeBuilder. I followed the instructions and added the relevant section to appsettings.json as show below.

"NavigationOptions": {
    "RootTreeBuilderName": "cloudscribe.Web.Navigation.JsonNavigationTreeBuilder",
    "NavigationMapXmlFileName": "navigation.xml",
    "NavigationMapJsonFileName": "navigation.json"
  }

If I substitute Json for Xml in the top line above, everything works as expected.

Thanks in advance :-)

[joeaudette]

In addition to the config change, in order to use Json you also need this:

services.AddScoped<INavigationTreeBuilder, JsonNavigationTreeBuilder>();

[matthewblott]

No joy I'm afraid. Here's my full ConfigureServices method:

    public void ConfigureServices(IServiceCollection services)
    {
      services.AddSingleton<IActionContextAccessor, ActionContextAccessor>();
      services.AddScoped(x => x.GetRequiredService<IUrlHelperFactory>().
        GetUrlHelper(x.GetRequiredService<IActionContextAccessor>().ActionContext));
      services.AddCloudscribeNavigation(Configuration.GetSection("NavigationOptions"));
      services.AddScoped<INavigationTreeBuilder, JsonNavigationTreeBuilder>();
      services.AddScoped<IOrderService, OrderService>();
      services.AddScoped<IProductService, ProductService>();
      services.AddScoped<IUserService, UserService>();
      services.AddRouting(x => x.LowercaseUrls = true);
      services.AddMvc(x =>
        {
          x.EnableEndpointRouting = true;
          x.Filters.Add(typeof(Breadcrumbs));
        })
        .AddViewLocalization(LanguageViewLocationExpanderFormat.Suffix)
        .SetCompatibilityVersion(CompatibilityVersion.Version_3_0)
        .AddRazorRuntimeCompilation();
    }

My sample project can be found here. FWIW I tried downloading your sample project and also couldn't get that to work.

[joeaudette]

I found the problem. The JsonNavigationTreeBuilder was returning a short name rather than the fully qualified type name and this was causing it to fail to find that tree builder by name. I've fixed this and published a new nuget: https://www.nuget.org/packages/cloudscribe.Web.Navigation/4.0.1

Thanks for letting us know about this issue.