asp.net 內核沒有初始化控制器

Question

我有一個 ASP.NET 項目，一切都返回 404，這是我的啟動代碼

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.AddControllersWithViews();
    }

    // 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.UseDeveloperExceptionPage();
        else
            app.UseExceptionHandler("/Home/Error");

        app.UseStaticFiles();

        app.UseAuthentication();

        app.UseRouting();

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

            endpoints.MapGet("/debug/routes", async ctx =>
            {
                await ctx.Response.WriteAsync(string.Join(", ", endpoints.DataSources.SelectMany(x => x.Endpoints)));
            });
        });

    }
}

這是一個示例 controller：

public class Home : Controller
{
    private readonly DatabaseContext _databaseContext;

    public Home(DatabaseContext databaseContext)
    {
        Console.WriteLine($"Initialized home controller"); // This doesn't get called at all.
        _databaseContext = databaseContext;
        _databaseContext.Database.EnsureCreated();

    }

    [HttpGet("/home")]
    public IActionResult Index()
    {
        ViewData["Products"] = _databaseContext.Products.ToList();
        return View();
    } 
    .....

and whenever I launch the server it I would go to /home and it would return 404, I also go to /debug/routes and it would show only the 2 endpoints inside the UseEndpoints function but never the controller classes I made

Answer 1

嘗試在服務中注冊您的數據庫上下文，如下所示。 由於DatabaseContext對HomeController的依賴無法解決，您可能會遇到錯誤。

// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
    // Add below line
    services.AddDbContext<DatabaseContext>(options => options.UseSqlServer(connectionString));
    services.AddControllersWithViews();
}

Answer 2

在Startup class 的Configure(IApplicationBuilder app, IWebHostEnvironment env)方法中，您需要類似： app.MapControllers();

我認為您的控制器已通過調用services.AddControllersWithViews(); 但是沒有中間件注冊來調用你的控制器，這應該在Configure方法中完成。