我在啟動類中收到“‘Startup.Configuration’和‘Startup.Configuration’之間的歧義”錯誤。我不知道我做了什么導致這個問題。我所做的就是創建一個 DBContext 類，但發生了這個錯誤。請在下面查看我的代碼：啟動.csusing 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")));        }