C# 如何在ASP.NET MVC中将IdentityUser与Recipe连接

我想在ASP.NET.CORE MVC中，在IdentityUser和Recipe之间创建一对多关系。当我尝试将ApplicationSerID分配给当前登录的用户ID时，它会得到空值。在服务器资源管理器中打开AspNetUsers时，它没有Recipes属性。我不知道如何使它正常工作

ApplicationUser.cs

 namespace WebApplication.Models
    {
        public class ApplicationUser : IdentityUser
        {
           
          public List<Recipe> Recipes { get; set; }
        }
    }

    namespace WebApplication.Controllers
    {
        public class RecipeController : Controller
        {
            private readonly ApplicationDbContext _applicationDbContext;
            private readonly UserManager<ApplicationUser> _userManager;
            private readonly SignInManager<ApplicationUser> _signInManager;
            public RecipeController( ApplicationDbContext applicationDbContext, UserManager<ApplicationUser> userManager, SignInManager<ApplicationUser> signInManager)
            {
                _signInManager = signInManager;
                _applicationDbContext = applicationDbContext;
                _userManager = userManager;
            }
    
            public IActionResult Create()
            {
    
                var userId = _userManager.GetUserId(User);
                return View();
            }
            [HttpPost]
            public async Task<IActionResult> Create([Bind("RecipeName,RecipeContent")] Recipe recipe)
            {
                var userId = _userManager.GetUserId(User);
                    recipe.ApplicationUserId = userId;
                    _applicationDbContext.Recipes.Add(recipe);
                    await _applicationDbContext.SaveChangesAsync();
                    return View(recipe);


        }
     
    }
}

namespace WebApplication.Models
{
    public class Recipe
    {
        [Key]
        public Guid Id { get; set; }
        [Required]
        public string RecipeName { get; set; }
        [Required]
        public string RecipeContent { get; set; }
        public string ApplicationUserId { get; set; }
        public ApplicationUser ApplicationUser { get; set; }
    }
}

namespace WebApplication
{
    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();
            services.AddDbContext<ApplicationDbContext>(option => option.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));
            services.AddIdentity<ApplicationUser, IdentityRole>().AddEntityFrameworkStores<ApplicationDbContext>();

        }

        // 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");
                // 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();

            app.UseRouting();
            app.UseAuthentication();
            app.UseAuthorization();

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

Startup.cs

 namespace WebApplication.Models
    {
        public class ApplicationUser : IdentityUser
        {
           
          public List<Recipe> Recipes { get; set; }
        }
    }

    namespace WebApplication.Controllers
    {
        public class RecipeController : Controller
        {
            private readonly ApplicationDbContext _applicationDbContext;
            private readonly UserManager<ApplicationUser> _userManager;
            private readonly SignInManager<ApplicationUser> _signInManager;
            public RecipeController( ApplicationDbContext applicationDbContext, UserManager<ApplicationUser> userManager, SignInManager<ApplicationUser> signInManager)
            {
                _signInManager = signInManager;
                _applicationDbContext = applicationDbContext;
                _userManager = userManager;
            }
    
            public IActionResult Create()
            {
    
                var userId = _userManager.GetUserId(User);
                return View();
            }
            [HttpPost]
            public async Task<IActionResult> Create([Bind("RecipeName,RecipeContent")] Recipe recipe)
            {
                var userId = _userManager.GetUserId(User);
                    recipe.ApplicationUserId = userId;
                    _applicationDbContext.Recipes.Add(recipe);
                    await _applicationDbContext.SaveChangesAsync();
                    return View(recipe);


        }
     
    }
}

namespace WebApplication.Models
{
    public class Recipe
    {
        [Key]
        public Guid Id { get; set; }
        [Required]
        public string RecipeName { get; set; }
        [Required]
        public string RecipeContent { get; set; }
        public string ApplicationUserId { get; set; }
        public ApplicationUser ApplicationUser { get; set; }
    }
}

namespace WebApplication
{
    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();
            services.AddDbContext<ApplicationDbContext>(option => option.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));
            services.AddIdentity<ApplicationUser, IdentityRole>().AddEntityFrameworkStores<ApplicationDbContext>();

        }

        // 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");
                // 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();

            app.UseRouting();
            app.UseAuthentication();
            app.UseAuthorization();

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

命名空间Web应用程序
{
公营创业
{
公共启动（IConfiguration配置）
{
配置=配置；
}
公共IConfiguration配置{get；}
//此方法由运行时调用。请使用此方法将服务添加到容器中。
public void配置服务（IServiceCollection服务）
{
services.AddControllersWithViews（）；
services.AddDbContext
也许这对您有用。
在Sql Server中，执行以下命令

ALTER TABLE Recipes
ADD UserId nvarchar(450)

ALTER TABLE Recipes
ADD FOREIGN KEY (UserId) REFERENCES AspNetUsers(Id)

你有没有遵循官方文件


您是否更新了ApplicationDbCOntext类以从IdentityDbContext派生

    public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
{
   public virtual DbSet<Recipe> Recipes { get; set; }
    public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
        : base(options)
    {
    }

    protected override void OnModelCreating(ModelBuilder builder)
    {
        base.OnModelCreating(builder);
    }
}

更新1:
我明白你的意思了，它没有用外键创建字段。我在其中创建了一个外键，但在初始创建时它没有创建另一个表。也许这会对你有所帮助

    public class ApplicationUser : IdentityUser
{
    public virtual Recipe Recipes { get; set; }
}

回答你自己的问题，如果你找到了解决方案，我或多或少也面临着同样的问题，如果我找到了解决方案，我会继续调查并更新我的帖子


好的，它与我上面更新的内容一起工作。我有屏幕截图确认。我让它在我的数据库上工作。让我知道它是否对您有效。
当您说“[…]当前登录的userId它得到null值”时，您的意思是
var userId=\u userManager.GetUserId（User）；
为空？如果是，您是使用cookie身份验证还是如何识别用户？请共享您的启动。csI已添加启动。csI是否尝试在您的
创建
路由上添加
[Authorize]
属性？您好@KamilGórny，哪个值为空？