CS0120 非静态字段、方法或 属性 'Startup.Configuration' 需要对象引用

Question

我正在使用 .NET Core 3.0.1 并在 Services.cs 中设置我的 dbcontext。我使用了以下代码，但显示了此错误：

An object reference is required for the non-static field, method, or property 'Startup.Configuration'

但教程显示相同的代码。

谁能看出我可能哪里出错了？

services.AddDbContext<IPSLContext>(options => options.UseSqlServer(Configuration.GetConnectionString("myDb")));

string connectionString = Configuration.GetConnectionString("myDb");
services.AddDbContext<IPSLContext>(options => options.UseSqlServer(connectionString));     

完整的 .cs 文件

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using SecurityMaintenance.Models;

namespace SecurityMaintenanceCore
{
    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        public static void ConfigureServices(IServiceCollection services)
        {
            services.AddControllersWithViews();
            services.AddAuthentication()
                    .AddCookie(options =>
                     {
                         options.LoginPath = "/Home/UnauthorizedAccess/";
                         options.AccessDeniedPath = "/Home/UnauthorizedAccess/";
                     });
            services.AddMvc(); 
            string connectionString = Configuration.GetConnectionString("myDb");
            services.AddDbContext<IPSLContext>(options => options.UseSqlServer(connectionString));
        }
        public static void Configure(IApplicationBuilder app, IWebHostEnvironment 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.UseRouting();
            app.UseAuthentication();
            app.UseAuthorization();
            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllerRoute(
                    name: "default",
                    pattern: "{controller=Home}/{action=Removed}/{id?}");
            });
        }
    }
}

Answer 1

问题是 public IConfiguration Configuration { get; } 不是静态的，但试图调用它的 ConfigureServices 是静态的。 只需使用 public void ConfigureServices(IServiceCollection services) （注意没有静态修饰符）。