Add project files.

StandardConsole/Program.cs

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+// See https://aka.ms/new-console-template for more information
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using StandardConsole.Repositories;
+using System.Security.Cryptography.X509Certificates;
+
+
+
+IHost host = CreateHostBuilder(args).Build();
+var worker = ActivatorUtilities.CreateInstance<Worker>((IServiceProvider)host.Services);
+worker.Run();
+
+static IHostBuilder CreateHostBuilder(string[] args)
+{
+    return Host.CreateDefaultBuilder(args)
+        .ConfigureAppConfiguration((context, configuration) =>
+        {
+            configuration.Sources.Clear();
+            var environmentName = Environment.GetEnvironmentVariable("DOTNETCORE_ENVIRONMENT");
+            configuration.AddJsonFile("appsettings.json",optional: true, reloadOnChange: true);
+            configuration.AddJsonFile($"appsettings.{environmentName}.json", optional: true, reloadOnChange: true);
+            configuration.AddCommandLine(args);
+
+        })
+        .ConfigureServices((context, services) =>
+        {
+            services.AddScoped<ISampleRepository, SampleRepository>();
+        });
+}

StandardConsole/Properties/launchSettings.json

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+{
+  "profiles": {
+    "StandardConsole": {
+      "commandName": "Project",
+      "commandLineArgs": "key1=val1 key2=val2",
+      "environmentVariables": {
+        "DOTNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "ProductVersion": {
+      "commandName": "Project",
+      "commandLineArgs": "key1=val1 key2=val2",
+      "environmentVariables": {
+        "DOTNETCORE_ENVIRONMENT": "Production"
+      }
+    }
+  }
+}

StandardConsole/Repositories/ISampleRepository.cs

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+namespace StandardConsole.Repositories
+{
+    public interface ISampleRepository
+    {
+        void DoSomething();
+    }
+}

StandardConsole/Repositories/SampleRepository.cs

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+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Logging;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StandardConsole.Repositories;
+
+public class SampleRepository : ISampleRepository
+{
+    private readonly IConfiguration _configuration;
+    private readonly ILogger<SampleRepository> _logger;
+
+    public void DoSomething()
+    {
+        _logger.LogInformation($"{nameof(SampleRepository)}.Dosomething - just did something");
+        var connString = _configuration.GetConnectionString("DefaultConnection");
+        _logger.LogInformation($"The Connection string from Sample Repository: {connString}");
+    }
+    public SampleRepository(IConfiguration configuration, ILogger<SampleRepository> logger)
+    {
+        _configuration = configuration;
+        _logger = logger;
+    }
+
+}

StandardConsole/StandardConsole.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.Hosting" Version="7.0.1" />
+    <PackageReference Include="Microsoft.Extensions.Hosting.Abstractions" Version="7.0.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <None Update="appsettings.Production.json">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+    <None Update="appsettings.Development.json">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+    <None Update="appsettings.json">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+
+</Project>

StandardConsole/Worker.cs

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+// See https://aka.ms/new-console-template for more information
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Logging;
+using StandardConsole.Repositories;
+
+public class Worker
+{
+    private readonly IConfiguration _configuration;
+    private readonly ILogger<Worker> _logger;
+    private readonly ISampleRepository _sampleRepository;
+
+    public Worker(IConfiguration configuration, ILogger<Worker> logger, ISampleRepository sampleRepository)
+    {
+        _configuration = configuration;
+        _logger = logger;
+        _sampleRepository = sampleRepository;
+    }
+    public void Run()
+    {
+        _logger.LogInformation("Hello, world!!!");
+        var connString = _configuration.GetConnectionString("DefaultConnection");
+        _logger.LogInformation($"Connection string: {connString}");
+        _logger.LogInformation($"key1: {_configuration["key1"]}");
+        _logger.LogInformation($"key2: {_configuration["key2"]}");
+
+        _sampleRepository.DoSomething();
+    }
+
+}

StandardConsole/appsettings.Development.json

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+{
+  "ConnectionStrings": {
+    "DefaultConnection": "Server=Devserver;Database=DevDb;User Id==MeMyselfAndI;Password=SuperSecret"
+  }
+}

StandardConsole/appsettings.Production.json

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+{
+  "ConnectionStrings": {
+    "DefaultConnection": "Server=Prodserver;Database=ProdDb;User Id==MeMyselfAndI;Password=SuperSecret"
+  }
+}

StandardConsole/appsettings.json

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+{
+  "ConnectionStrings": {
+    "DefaultConnection": "Server(local);Database=StdDb;User Id==MeMyselfAndI;Password=SuperSecret"
+  }
+}

StandardConsoleApp.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.5.33627.172
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "StandardConsole", "StandardConsole\StandardConsole.csproj", "{8C92891D-C347-4A5C-AAE4-D50F705F00A4}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{8C92891D-C347-4A5C-AAE4-D50F705F00A4}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{8C92891D-C347-4A5C-AAE4-D50F705F00A4}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{8C92891D-C347-4A5C-AAE4-D50F705F00A4}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{8C92891D-C347-4A5C-AAE4-D50F705F00A4}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {305DAD26-537A-41D7-9A94-9B4911FAF44A}
+	EndGlobalSection
+EndGlobal