質問編集履歴
2
「書き換え前のStartsUp」を「書き換えたStartup」に修正しました。
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```
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### 書き換え
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### 書き換えたStartup
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変更したstartup.csの内容について追記しました。 使用したテンプレートを追記しました。 ログインページの生成方法を追記しました。
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@@ -4,7 +4,7 @@
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.NET5を利用してログインページを作成しました。
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そこでログインページを一番最初に表示するためにstartup.csを書き換えたのですがそうするとエラーが表示されました。
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そこでログインページを一番最初に表示するためにHomeControllerにアクションを作成し、startup.csを書き換えた（下記）のですがそうするとエラーが表示されました。
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###
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### Controller
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```C#
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using Microsoft.AspNetCore.Mvc;
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using Microsoft.Extensions.Logging;
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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Linq;
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using System.Threading.Tasks;
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using プロジェクト.Models;
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namespace プロジェクト.Controllers
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{
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public class HomeController : Controller
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{
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private readonly ILogger<HomeController> _logger;
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public HomeController(ILogger<HomeController> logger)
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{
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_logger = logger;
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}
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public IActionResult Index()
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{
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return View();
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}
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public IActionResult Privacy()
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{
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return View();
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}
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//ここから追加
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public IActionResult Login()
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{
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return View("Areas/Identity/Pages/Account/Login.cshtml");
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}
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//ここまで
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[ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
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public IActionResult Error()
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{
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return View(new ErrorViewModel { RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier });
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}
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}
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}
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```
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### 書き換え前のStartsUp
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```C#
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using Microsoft.AspNetCore.Builder;
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using Microsoft.AspNetCore.Hosting;
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using Microsoft.AspNetCore.HttpsPolicy;
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using Microsoft.AspNetCore.Identity;
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using Microsoft.AspNetCore.Identity.UI;
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using Microsoft.EntityFrameworkCore;
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using Microsoft.Extensions.Configuration;
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using Microsoft.Extensions.DependencyInjection;
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using Microsoft.Extensions.Hosting;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Threading.Tasks;
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using プロジェクト.Data;
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namespace プロジェクト
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{
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public class Startup
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{
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public Startup(IConfiguration configuration)
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{
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Configuration = configuration;
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}
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public IConfiguration Configuration { get; }
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// This method gets called by the runtime. Use this method to add services to the container.
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public void ConfigureServices(IServiceCollection services)
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{
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services.AddRazorPages();
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services.AddDbContext<ApplicationDbContext>(options =>
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options.UseSqlServer(
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Configuration.GetConnectionString("DefaultConnection")));
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services.AddDatabaseDeveloperPageExceptionFilter();
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services.AddDefaultIdentity<IdentityUser>(options => options.SignIn.RequireConfirmedAccount = true)
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.AddEntityFrameworkStores<ApplicationDbContext>();
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services.AddControllersWithViews();
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}
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// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
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public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
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{
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if (env.IsDevelopment())
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{
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app.UseDeveloperExceptionPage();
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app.UseMigrationsEndPoint();
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}
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else
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{
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app.UseExceptionHandler("/Home/Error");
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// The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
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app.UseHsts();
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}
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app.UseHttpsRedirection();
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app.UseStaticFiles();
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app.UseRouting();
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app.UseAuthentication();
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app.UseAuthorization();
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app.UseEndpoints(endpoints =>
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{
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endpoints.MapRazorPages();
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endpoints.MapControllerRoute(
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name: "default",
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pattern: "{controller=Home}/{action=Login}/{id?}"); //ここを書き換えた
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/*
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書き換え前は
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pattern: "{controller=Home}/{action=Index}/{id?}");
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*/
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});
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}
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}
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}
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```
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### Login.cshtml
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```Razor
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35
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@page
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36
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37
307
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@@ -42,7 +312,7 @@
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@{
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44
314
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45
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ViewData["Title"] = "ログイン"; @*ここにNullReferenceException: Object reference not set to an instance of an object.が表示されます*@
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ViewData["Title"] = "ログイン"; //@*ここにNullReferenceException: Object reference not set to an instance of an object.が表示されます*@
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}
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@@ -130,7 +400,7 @@
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401
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### 補足情報
|
|
132
402
|
|
|
133
|
-
|
|
403
|
+
VS2019のテンプレートはRazorの認証に「個別のアカウント」を使ってプロジェクトを生成し、Loginページをスキャフォールディング機能を使って作成しました。
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