Добавьте файлы проекта.

Adapters.sln

+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.31903.59
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DDO_Application", "DDO_Application\DDO_Application.csproj", "{D568A3F5-FA39-4244-8CD8-0B179626F4F8}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{D568A3F5-FA39-4244-8CD8-0B179626F4F8}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{D568A3F5-FA39-4244-8CD8-0B179626F4F8}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{D568A3F5-FA39-4244-8CD8-0B179626F4F8}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{D568A3F5-FA39-4244-8CD8-0B179626F4F8}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {249CAA4E-FC26-4E8D-AA8B-ED46749BCB95}
+	EndGlobalSection
+EndGlobal

DDO_Application/Controllers/apiController.cs

+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.DependencyInjection;
+using DDO_Application.Model;
+using System;
+using System.Threading.Tasks;
+
+namespace DDO_Application.Controllers {
+
+    [ApiController]
+    public class apiController : ControllerBase {
+        public IServiceProvider Services { get; }
+        private IUploadService _uploadService;
+        public apiController(IServiceProvider services) {
+            Services = services;
+
+            using (var scope = Services.CreateScope()) {
+                var uploadProcessingService =
+                    scope.ServiceProvider
+                        .GetRequiredService<IUploadService>();
+                _uploadService = uploadProcessingService;
+            }
+        }
+
+        [HttpGet]
+        [Route("[controller]")]
+        public async Task<ActionResult<apiStatus>> Get() {
+            return new apiStatus();
+        }
+        [HttpGet]
+        [Route("[controller]/lifetime")]
+        public int GetLifetime() => _uploadService.Counter;
+    }
+
+    public class apiStatus {
+        public string name { get; set; } = "DDO_Application";
+        public string version { get; set; } = "0.0.0.1";
+        public string staus { get; set; } = "Ok";
+    }
+}
+

DDO_Application/DDO_Application.csproj

+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>net5.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Swashbuckle.AspNetCore" Version="5.6.3" />
+  </ItemGroup>
+
+</Project>

DDO_Application/Model/IUploadService.cs

+using Microsoft.Extensions.Hosting;
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace DDO_Application.Model {
+    public interface IUploadService{
+        public int Counter { get; }
+        Task DoWork(CancellationToken stoppingToken);
+    }
+}

DDO_Application/Program.cs

+using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace DDO_Application {
+    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>();
+                });
+    }
+}

DDO_Application/Properties/launchSettings.json

+{
+  "$schema": "http://json.schemastore.org/launchsettings.json",
+  "iisSettings": {
+    "windowsAuthentication": false,
+    "anonymousAuthentication": true,
+    "iisExpress": {
+      "applicationUrl": "http://localhost:41712",
+      "sslPort": 44362
+    }
+  },
+  "profiles": {
+    "IIS Express": {
+      "commandName": "IISExpress",
+      "launchBrowser": true,
+      "launchUrl": "swagger",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "DDO_Application": {
+      "commandName": "Project",
+      "dotnetRunMessages": "true",
+      "launchBrowser": true,
+      "launchUrl": "swagger",
+      "applicationUrl": "https://localhost:5001;http://localhost:5000",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}

DDO_Application/Services/UploadHostedService.cs

+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using DDO_Application.Model;
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace DDO_Application.Services {
+    public class UploadHostedService : BackgroundService {
+        public IServiceProvider Services { get; }
+        public UploadHostedService(IServiceProvider services) {
+            Services = services;
+        }
+
+        private async Task DoWork(CancellationToken stoppingToken) {
+            using (var scope = Services.CreateScope()) {
+                var uploadProcessingService =
+                    scope.ServiceProvider
+                        .GetRequiredService<IUploadService>();
+
+                await uploadProcessingService.DoWork(stoppingToken);
+            }
+        }
+        protected override async Task ExecuteAsync(CancellationToken stoppingToken) {
+            await DoWork(stoppingToken);
+        }
+        public override async Task StopAsync(CancellationToken stoppingToken) {
+            await base.StopAsync(stoppingToken);
+        }
+
+    }
+}

DDO_Application/Services/UploadProcessingService.cs

+using Microsoft.Extensions.Hosting;
+using DDO_Application.Model;
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace DDO_Application.Services {
+    public class UploadProcessingService : IUploadService {
+        private int _counter = 0;
+        public int Counter { get => _counter; }
+
+        public UploadProcessingService() {
+        }
+
+        public async Task DoWork(CancellationToken stoppingToken) {
+            while (!stoppingToken.IsCancellationRequested) {
+                _counter++;
+                //что то тут опрашивается... куда то там добавляется....
+                await Task.Delay(10000, stoppingToken);
+            }
+        }
+    }
+}

DDO_Application/Startup.cs

+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.AspNetCore.HttpsPolicy;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+using Microsoft.OpenApi.Models;
+using DDO_Application.Model;
+using DDO_Application.Services;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace DDO_Application {
+    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.AddSwaggerGen(c => {c.SwaggerDoc("v1", new OpenApiInfo { Title = "DDO_Application", Version = "v1" }); });
+            services.AddHostedService<UploadHostedService>();
+            services.AddSingleton<IUploadService, UploadProcessingService>();
+
+        }
+
+        // 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();
+                app.UseSwagger();
+                app.UseSwaggerUI(c => c.SwaggerEndpoint("/swagger/v1/swagger.json", "DDO_Application v1"));
+            }
+
+            app.UseHttpsRedirection();
+
+            app.UseRouting();
+
+            app.UseAuthorization();
+
+            app.UseEndpoints(endpoints => {
+                endpoints.MapControllers();
+            });
+        }
+    }
+}

DDO_Application/appsettings.Development.json

+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft": "Warning",
+      "Microsoft.Hosting.Lifetime": "Information"
+    }
+  }
+}

DDO_Application/appsettings.json

+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft": "Warning",
+      "Microsoft.Hosting.Lifetime": "Information"
+    }
+  },
+  "AllowedHosts": "*"
+}