缺少 startup.cs program.cs .Net Core Razor [英] Missing startup.cs program.cs .Net Core Razor

问题描述

我有一个使用 Razor 页面的 .Net Core 3 Web 应用程序.几天前我在使用解决方案资源管理器，现在我注意到我缺少 startup.cs 和 program.cs.我怎样才能恢复它们?我也收到此错误:无法运行您的项目.未定义 RunCommand 属性".

I have a .Net Core 3 Web App using Razor pages. I was messing with solution explorer a few days ago and now I notice I'm missing startup.cs and program.cs. How can I restore them? I'm also getting this error: "Unable to run your project. The RunCommand property is not defined".

推荐答案

首先，在尝试重建文件之前，我会检查以确保您的文件位于项目目录中.如果它们仍在目录中，您可以使用 Visual Studio 将它们添加到您的解决方案中.

First I'd check to make sure your files are in the project directory before trying to rebuild them. If they are still in the directory you can add them to your solution using Visual Studio.

Right click the project > Add > Existing item...

如果您没有这些文件并且找不到它们，请重新创建它们.这是它们的默认代码.

If you don't have those files and can't find them, then recreate them. Here's the default code for them.

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;

namespace NOCng
{
    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.AddRazorPages();
        }

        // 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 =>
            {
                endpoints.MapRazorPages();
            });
        }
    }
}

程序.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;

namespace NOCng
{
    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.UseStartup<Startup>();
                });
    }
}

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