.gist-IStartup-aspnetcore-issue

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FredrikHr.GistIssues.AspnetCoreIStartup.csproj

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <TargetFramework>net5.0</TargetFramework>
  </PropertyGroup>

</Project>

FredrikHr.GistIssues.AspnetCoreIStartup.sln


Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio Version 16
VisualStudioVersion = 16.0.30114.105
MinimumVisualStudioVersion = 10.0.40219.1
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "FredrikHr.GistIssues.AspnetCoreIStartup", "FredrikHr.GistIssues.AspnetCoreIStartup.csproj", "{D0AD07FA-35AA-4691-9D2A-E9B09132BEDF}"
EndProject
Global
	GlobalSection(SolutionConfigurationPlatforms) = preSolution
		Debug|Any CPU = Debug|Any CPU
		Release|Any CPU = Release|Any CPU
	EndGlobalSection
	GlobalSection(SolutionProperties) = preSolution
		HideSolutionNode = FALSE
	EndGlobalSection
	GlobalSection(ProjectConfigurationPlatforms) = postSolution
		{D0AD07FA-35AA-4691-9D2A-E9B09132BEDF}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
		{D0AD07FA-35AA-4691-9D2A-E9B09132BEDF}.Debug|Any CPU.Build.0 = Debug|Any CPU
		{D0AD07FA-35AA-4691-9D2A-E9B09132BEDF}.Release|Any CPU.ActiveCfg = Release|Any CPU
		{D0AD07FA-35AA-4691-9D2A-E9B09132BEDF}.Release|Any CPU.Build.0 = Release|Any CPU
	EndGlobalSection
EndGlobal

Program.cs

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

namespace FredrikHr.GistIssues.AspnetCoreIStartup
{
    public static 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>();
                    // Alternatively
                    // webBuilder.UseStartup(ctx => new Startup(ctx));
                });
    }
}

Startup.cs

using System;

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;

namespace FredrikHr.GistIssues.AspnetCoreIStartup
{
    public class Startup : StartupBase
    {
        private readonly WebHostBuilderContext context;

        public Startup(WebHostBuilderContext context)
        {
            this.context = context;
        }

        public override void ConfigureServices(IServiceCollection services)
        {
            base.ConfigureServices(services);
        }

        public override void Configure(IApplicationBuilder app)
        {
            var env = context.HostingEnvironment;
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseRouting();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapGet("/", async context =>
                {
                    await context.Response.WriteAsync("Hello World!");
                });
            });
        }
    }
}