c# - 如何在不登录的情况下设置身份？无密码+​​无数据库

Question

我想让人们有机会在我的网站上选择用户名。仅针对他们当前的会话，无需登录名、密码和数据库。

我在网上搜索答案，但我找不到真正的答案。也许我只是使用了错误的术语。

知道如何实现吗？

标签： c#asp.net-core-identity

Answer 1

要设置当前身份，您可以尝试HttpContext.SignInAsync.

请按照以下步骤操作：

1. 控制器

   public class HomeController : Controller
   {
       public IActionResult Index()
       {
           List<SelectListItem> select = new List<SelectListItem>
           {
               new SelectListItem("Tom","Tom"),
               new SelectListItem("Jack","Jack"),
               new SelectListItem("Vicky","Vicky")
           };
           ViewBag.Select = select;
           return View();
       }
       [HttpPost]
       public async Task<IActionResult> Login(string userName)
       {
           await HttpContext.SignOutAsync();
           var identity = new ClaimsIdentity();
           identity.AddClaim(new Claim(ClaimTypes.Name, userName));
           var principal = new ClaimsPrincipal(identity);
           await HttpContext.SignInAsync(principal);
           return RedirectToAction("Index");
       }
   }
   

2. 看法

   @{
       ViewData["Title"] = "Home Page";
   }
   
   <div class="text-center">
       <h1 class="display-4">Welcome</h1>
       <p>Learn about <a href="https://docs.microsoft.com/aspnet/core">building Web apps with ASP.NET Core</a>.</p>
   </div>
   <div>
       Hi @User?.Identity?.Name;
   </div>
   <form asp-action="Login" method="post">
       <select name="userName" class="form-control" asp-items="@ViewBag.Select"></select>
       <input type="submit" value="Login" />
   </form>
   

3. 配置Startup.cs为启用身份验证

   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.Configure<CookiePolicyOptions>(options =>
           {
               // This lambda determines whether user consent for non-essential cookies is needed for a given request.
               options.CheckConsentNeeded = context => true;
               options.MinimumSameSitePolicy = SameSiteMode.None;
           });
   
           services.AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme)
                   .AddCookie();
           services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
       }
   
       // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
       public void Configure(IApplicationBuilder app, IHostingEnvironment 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.UseCookiePolicy();
           app.UseAuthentication();
           app.UseMvc(routes =>
           {
               routes.MapRoute(
                   name: "default",
                   template: "{controller=Home}/{action=Index}/{id?}");
           });
       }
   }