c# - 在 Asp.Net Core 应用程序中更改默认页面
问题描述
我正在尝试更改我的 ASP.NET Core MVC C# 应用程序中的起始页。我想首先将用户带到登录页面,并且我已更改Startup.cs
为:
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
app.UseEndpoints(endpoints =>
{
endpoints.MapControllerRoute(
name: "default",
pattern: "{controller=Login}/{action=Index}/{id?}");
}
}
我的控制器看起来像这样
public class LoginController : Controller
{
public IActionResult Index()
{
return View();
}
}
我有一个名为 Login.cshtml 的页面
我在这里想念什么?
这是我的startup.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using eDrummond.Models;
namespace eDrummond
{
public class Startup
{
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public IConfiguration Configuration { get; }
public void ConfigureServices(IServiceCollection services)
{
services.AddControllersWithViews();
services.AddDbContext<eDrummond_MVCContext>();
services.AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme)
.AddCookie(opetions =>
{
options.LoginPath = "/Login/Index";
});
}
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
app.UseAuthentication();
app.UseCors(
options => options.AllowAnyOrigin()
);
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
else
{
app.UseExceptionHandler("/Home/Error");
app.UseHsts();
}
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseRouting();
app.UseAuthorization();
app.UseEndpoints(endpoints =>
{
endpoints.MapControllerRoute(
name: "default",
pattern: "{controller=Login}/{action=Index}/{id?}");
});
}
}
}
我正在使用 VS2019 并创建了一个 asp.net 核心应用程序,然后选择了 MVC,我所做的只是脚手架表。所以配置应该是正确的?
解决方案
您需要考虑身份验证流程。首先你是未经授权的。当您访问任何未经授权的页面时,您希望重定向到您的登录页面,对吗?然后你需要告诉这个程序:
public void ConfigureServices(IServiceCollection services) {
services.AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme)
// What kind of authentication you use? Here I just assume cookie authentication.
.AddCookie(options =>
{
options.LoginPath = "/Login/Index";
});
}
public void Configure(IApplicationBuilder app) {
// Add it but BEFORE app.UseEndpoints(..);
app.UseAuthentication();
}
这是一个stackoverflow主题,可以解决您的问题:
编辑:
事实证明,您可以执行以下操作:
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
// You need to comment this out ..
// services.AddRazorPages();
// And need to write this instead:
services.AddMvc().AddRazorPagesOptions(options =>
{
options.Conventions.AddPageRoute("/Login/Index", "");
});
}
2. 编辑:
所以我的第一个答案没有错,但它没有包括对控制器所需的更改。有两种解决方案:
- 您将 [Authorize] 添加到所有控制器,您希望获得授权,例如 IndexModel(位于 /Pages/Index.cshtml.cs),当进入时,程序会看到,用户未授权并重定向到 /Login /Index(文件位于 /Pages/Login/Index.cshtml.cs)。然后您不需要指定 DefaultPolicy 或 FallbackPolicy(请参阅下面的源代码以获取 FallbackPolicy 参考)
- 您可以让程序说,即使没有标记[Authorize],所有控制器也需要授权。但是你需要用 [AllowAnonymous] 标记那些你想未经授权通过的控制器。这就是它应该如何实现的:
结构:
/Pages
Index.cshtml
Index.cshtml.cs
/Login
Index.cshtml
Index.cshtml.cs
/Startup.cs
文件:
// 位于 /Startup.cs 中的文件:
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.AspNetCore.Authentication.Cookies;
using Microsoft.Extensions.Configuration;
namespace stackoverflow_aspnetcore_59448960
{
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)
{
// Does automatically collect all routes.
services.AddRazorPages();
services.AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme)
.AddCookie(options =>
{
// That will point to /Pages/Login.cshtml
options.LoginPath = "/Login/Index";
}); ;
services.AddAuthorization(options =>
{
// This says, that all pages need AUTHORIZATION. But when a controller,
// for example the login controller in Login.cshtml.cs, is tagged with
// [AllowAnonymous] then it is not in need of AUTHORIZATION. :)
options.FallbackPolicy = new AuthorizationPolicyBuilder()
.RequireAuthenticatedUser()
.Build();
});
}
// 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("/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.UseAuthorization();
app.UseEndpoints(endpoints =>
{
// Defines default route behaviour.
endpoints.MapRazorPages();
});
}
}
}
// 位于 /Pages/Login/Index.cshtml.cs 的文件:
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.Extensions.Logging;
namespace stackoverflow_aspnetcore_59448960.Pages.Login
{
// Very important
[AllowAnonymous]
// Another fact: The name of this Model, I mean "Index" need to be
// the same as the filename without extensions: Index[Model] == Index[.cshtml.cs]
public class IndexModel : PageModel
{
private readonly ILogger<IndexModel> _logger;
public IndexModel(ILogger<IndexModel> logger)
{
_logger = logger;
}
public void OnGet()
{
}
}
}
// 文件位于 /Pages/Index.cshtml.cs
using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.Extensions.Logging;
namespace stackoverflow_aspnetcore_59448960.Pages
{
// No [Authorize] needed, because of FallbackPolicy (see Startup.cs)
public class IndexModel : PageModel
{
private readonly ILogger<IndexModel> _logger;
public IndexModel(ILogger<IndexModel> logger)
{
_logger = logger;
}
public void OnGet()
{
}
}
}
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