Value cannot be null - ASP .NET

Question

Cześć, mam problem z podpięciem bazy danych w entity do projektu. 

Wyskakuje taki error:

// Startup.cs

namespace KursASPNET
{
    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddDbContext<ApplicationDbContext>(x => 
                x.UseSqlServer(Configuration.GetConnectionString("Default")));

            services.AddControllersWithViews();
            // In production, the Angular files will be served from this directory
            services.AddSpaStaticFiles(configuration =>
            {
                configuration.RootPath = "ClientApp/dist";
            });
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env, IServiceProvider serviceProvider)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseExceptionHandler("/Error");
                // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
                app.UseHsts();
            }

            app.UseHttpsRedirection();
            app.UseStaticFiles();
            if (!env.IsDevelopment())
            {
                app.UseSpaStaticFiles();
            }

            app.UseRouting();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllerRoute(
                    name: "default",
                    pattern: "{controller}/{action=Index}/{id?}");
            });

            app.UseSpa(spa =>
            {
                // To learn more about options for serving an Angular SPA from ASP.NET Core,
                // see https://go.microsoft.com/fwlink/?linkid=864501

                spa.Options.SourcePath = "ClientApp";

                if (env.IsDevelopment())
                {
                    spa.UseAngularCliServer(npmScript: "start");
                }
            });

            serviceProvider.GetRequiredService<ApplicationDbContext>().Database.EnsureCreated();
        }
    }
}

// appsettings

{
  "ConnectionString": {
    "Default": "Server=DESKTOP-F9Q067L\\SQLEXPRESS;Database=KursASPNET;Trusted_Connection=True;"
  },
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft": "Warning",
      "Microsoft.Hosting.Lifetime": "Information"
    }
  },
  "Application": {
    "RefreshTime": 1000
  }
}

 

Answer 1

masz literówkę w pliku appSettings.json -> zamiast ConnectionString powinno być ConnectionStrings

Comments

Poprawiłem, to teraz jest taki błąd.

---

COś z jsonem jest nie tak, podeślij jak teraz wygląda

---

{
  "ConnectionStrings": {
    "Default": "Server=DESKTOP-F9Q067L\\SQLEXPRESS;Database=KursASPNET;Trusted_Connection=True;"
  },
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft": "Warning",
      "Microsoft.Hosting.Lifetime": "Information"
    }
  },
  "Application": {
    "RefreshTime": 1000
  }
}

 

---

Spróbuj podmienić: 'Server=DESKTOP-F9Q067L\\SQLEXPRESS' na 'Server=.\\SQLEXPRESS'

---

Działa, dzięki wielkie :D