Use option pattern

Author: Sergey Tregub

ProjectTemplates/ReferenceProject/Configuration/ApplicationSettings.cs

@@ -0,0 +1,14 @@
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace ReferenceProject.Configuration
+{
+    public static class ApplicationSettings
+    {
+        public static void AddSettings(this IServiceCollection services, IConfiguration Configuration)
+        {
+            services.AddOptions<Settings.Products>()
+                .Bind(Configuration.GetSection(Settings.Products.SectionName));
+        }
+    }
+}

ProjectTemplates/ReferenceProject/Controllers/ProductsController.cs

@@ -2,6 +2,7 @@
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Options;
 using ReferenceProject.Repo;
 using System;
 using System.Collections.Generic;
@@ -14,15 +15,17 @@ namespace ReferenceProject.Controllers
     [Produces("application/json")]
     public class ProductsController: ControllerBase
     {
-        Repo.IProductsRepo ProductsRepo { get; }
+        IProductsRepo ProductsRepo { get; }
+        IOptionsSnapshot<Settings.Products> Settings { get; }
         IMapper Mapper { get; }
         ILogger Logger { get; }
 
-        public ProductsController(IProductsRepo productsRepo, IMapper mapper, ILogger<ProductsController> logger)
+        public ProductsController(IProductsRepo productsRepo, IOptionsSnapshot<Settings.Products> options, IMapper mapper, ILogger<ProductsController> logger)
         {
             Logger = logger ?? throw new ArgumentNullException(nameof(logger));
             Mapper = mapper ?? throw new ArgumentNullException(nameof(mapper));
             ProductsRepo = productsRepo ?? throw new ArgumentNullException(nameof(productsRepo));
+            Settings = options ?? throw new ArgumentNullException(nameof(options));
         }
 
         /// <summary>
@@ -111,5 +114,11 @@ public IActionResult ThrowAnException()
         {
             throw new Exception("Example exception");
         }
+
+        [HttpGet("Settings")]
+        public Settings.Products GetSettings()
+        {
+            return Settings.Value;
+        }
     }
 }

ProjectTemplates/ReferenceProject/Settings.cs

@@ -0,0 +1,10 @@
+namespace ReferenceProject.Settings
+{
+    public class Products
+    {
+        public const string SectionName = "Products";
+
+        public string TempFolder { get; set; }
+        public string BackendServiceUrl { get; set; }
+    }
+}

ProjectTemplates/ReferenceProject/Settings/Products.cs

@@ -1,5 +1,6 @@
 using Autofac;
 using Autofac.Configuration;
+using Autofac.Core;
 using AutoMapper;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Diagnostics.HealthChecks;
@@ -15,6 +16,7 @@
 using Newtonsoft.Json;
 using Newtonsoft.Json.Converters;
 using Newtonsoft.Json.Serialization;
+using ReferenceProject.Configuration;
 using ReferenceProject.Filters;
 using ReferenceProject.Modules;
 using System.IO;
@@ -94,6 +96,8 @@ public void ConfigureServices(IServiceCollection services)
             services.AddRouting();
             services.AddControllers();
             services.AddHealthChecks();
+
+            services.AddSettings(Configuration);
         }
 
         /// <summary>

ProjectTemplates/ReferenceProject/Startup.cs

@@ -32,8 +32,10 @@
       "FromLogContext"
     ]
   },
+  "Products": {
+    "TempFolder": "%TEMP%",
+    "BackendServiceUrl": "http://%gateway%/backend"
+  },
   "AllowedHosts": "*",
-  "CoolServiceEndpoint": "http://%ENDPOINT_HOST%/cool",
-  "AnotherServiceEndpoint": "http://%ENDPOINT_HOST%/another",
   "Urls": "http://localhost:5000"
 }