“Startup.Configuration”和“Startup.Configuration”的歧义

Question

在我的启动类上，我遇到了一个“Startup.Configuration和Startup.Configuration之间的歧义”错误。我不知道我做了什么来引起这个问题。我所做的就是创建一个DBContext类，然后发生了这个错误。请参阅我的代码如下：

Startup.cs

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.SpaServices.AngularCli;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.EntityFrameworkCore;
using Microsoft.AspNetCore.Identity;
using System;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.IdentityModel.Tokens;
using System.Text;
using IssueTracker.Data;

namespace IssueTracker
{
    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.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);

            // In production, the Angular files will be served from this directory
            services.AddSpaStaticFiles(configuration =>
            {
                configuration.RootPath = "ClientApp/dist";
            });

            // Enabling CORS
            services.AddCors(options => 
            {
                options.AddPolicy("EnableCORS", builder => 
                {
                    builder.AllowAnyOrigin().AllowAnyHeader().AllowAnyMethod().AllowCredentials().Build();
                });
            });

            // Connect to the Database
            services.AddDbContext<ApplicationDbContext>(options => options.UseSqlServer(Configuration.getConnectionString("DefaultConnection")));
        }

        // 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("/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.UseCors("EnableCORS");

            app.UseHttpsRedirection();
            app.UseStaticFiles();
            app.UseSpaStaticFiles();

            app.UseMvc(routes =>
            {
                routes.MapRoute(
                    name: "default",
                    template: "{controller}/{action=Index}/{id?}");
            });

            app.UseSpa(spa =>
            {
                // To learn more about options for serving an Angular SPA from ASP.NET Core,
                // see https://go.microsoft.com/fwlink/?linkid=864501

                spa.Options.SourcePath = "ClientApp";

                if (env.IsDevelopment())
                {
                    spa.UseAngularCliServer(npmScript: "start");
                }
            });
        }
    }
}

ApplicationDbContext

using IssueTracker.Models;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore;

namespace IssueTracker.Data
{
    public class ApplicationDbContext : IdentityDbContext<IdentityUser>
    {
        public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options) : base(options) {}

        // Creating the roles
        protected override void OnModelCreating(ModelBuilder builder) 
        {
            base.OnModelCreating(builder);

            builder.Entity<IdentityRole>().HasData(
                new { Id = "1", name="Admin", NoralizeName = "ADMIN" },
                new { Id = "1", name="Customer", NoralizeName = "CUSTOMER" },
                new { Id = "1", name="Moderator", NoralizeName = "MODERATOR" }
            );
        }

        public DbSet<ProductModel> Products { get; set; }
    }
}

你能告诉我这里出了什么问题吗？谢谢。

Answer 1

我也有同样的错误，只是关闭并重新打开我的IDE ()解决了它。我希望它能帮上忙

Answer 2

造成此错误的一个原因可能是您意外地复制了Startup.cs文件。

Answer 3

为了备份起见，我处理了解决方案文件，然后我得到了那个错误。当我删除备份文件的问题解决了。