asp.net-core-3.1 - .net core Ocelot 找不到名为 'ConfigureDevelopment' 或 'Configure' 的公共(public)方法

Question

下面的代码属于.net core web api，我称之为OcelotApiGateway。

我通过 OcelotApiGateway 上的 nuget 包管理器安装了 Ocelot 16.0.1。

这是我的Program.cs

using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;

namespace OcelotApiGateway
{
    public class Program
    {
        public static void Main(string[] args)
        {
            CreateHostBuilder(args).Build().Run();
        }

        public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.ConfigureAppConfiguration((host, config) => config.AddJsonFile("ocelot.json"));
                    webBuilder.UseStartup<Startup>();
                });
    }
}

这是Startup.cs

using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Ocelot.DependencyInjection;
using Ocelot.Middleware;

namespace OcelotApiGateway
{
    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.AddControllers();
            services.AddOcelot(Configuration);
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public async Task ConfigureAsync(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseHttpsRedirection();

            app.UseRouting();

            app.UseAuthorization();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllers();
            });

            await app.UseOcelot();
        }
    }
}

但是在Program.cs中的'CreateHostBuilder(args).Build().Run();'这一行，出现了这个错误

System.InvalidOperationException: 'A public method named 'ConfigureDevelopment' or 'Configure' could not be found in the 'OcelotApiGateway.Startup' type.'

Answer 1

我解决了这个问题，这是我的错。当我在 Configure() 方法中添加 await 时，此方法已被 Visual Studio 自动更改。如下。我后来才意识到这一点。

public async Task ConfigureAsync(IApplicationBuilder app, IWebHostEnvironment env)

这个方法必须是:

public async void Configure(IApplicationBuilder app, IWebHostEnvironment env)