Move ASP.NET Core config notes to dedicated file

.NET/ASP.NET/Configuration.md

@@ -0,0 +1,163 @@
+# ASP.NET Configuration
+
+## `Program.cs`
+
+```cs
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.Hosting;
+
+namespace App
+{
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            CreateHostBuilder(args).Build().Run();  // start and config ASP.NET App
+        }
+
+        public static IHostBuilder CreateHostBuilder(string[] args) =>
+            Host.CreateDefaultBuilder(args)
+                .ConfigureWebHostDefaults(webBuilder =>
+                {
+                    webBuilder.UseStartup<Startup>();  // config handled in Startup.cs
+                });
+    }
+}
+```
+
+## `Startup.cs`
+
+```cs
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.AspNetCore.HttpsPolicy;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace App
+{
+    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 DI container.
+        public void ConfigureServices(IServiceCollection services)
+        {
+            // set db context for the app using the connection string
+            services.AddDbContext<AppDbContext>(options => options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));
+
+            // Captures synchronous and asynchronous Exception instances from the pipeline and generates HTML error responses.
+            services.AddDatabaseDeveloperPageExceptionFilter();
+
+            // use Razor Pages, runtime compilation needs Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation pkg
+            services.AddRazorPages().AddRazorRuntimeCompilation();
+            // or
+            services.AddControllers();  // controllers w/o views
+            //or
+            sevices.AddControllersWithViews();  // MVC Controllers
+            
+            // set dependency injection lifetimes
+            services.AddSingleton<ITransientService, ServiceImplementation>();
+            services.AddScoped<ITransientService, ServiceImplementation>();
+            services.AddTransient<ITransientService, ServiceImplementation>();
+            
+        }
+
+        // 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("/Home/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 =>
+            {
+                // MVC routing
+                endpoints.MapControllerRoute(
+                    name: "default",
+                    pattern: "{controller=Home}/{action=Index}/{id?}"
+                );
+                // or
+                endpoints.MapControllers();  // map controllers w/o views
+                // or
+                endpoints.MapRazorPages();
+            });
+        }
+    }
+}
+```
+
+## `appsettings.json`
+
+Connection Strings & Secrets.
+
+```json
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft": "Warning",
+      "Microsoft.Hosting.Lifetime": "Information"
+    }
+  },
+  "AllowedHosts": "*"
+}
+```
+
+## `launchsettings.json`
+
+Launch Settings & Deployement Settings.
+
+```json
+{
+  "iisSettings": {
+    "windowsAuthentication": false,
+    "anonymousAuthentication": true,
+    "iisExpress": {
+      "applicationUrl": "http://localhost:51144",
+      "sslPort": 44335
+    }
+  },
+  "profiles": {
+    "IIS Express": {
+      "commandName": "IISExpress",
+      "launchBrowser": true,
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "BookListRazor": {
+      "commandName": "Project",
+      "dotnetRunMessages": "true",
+      "launchBrowser": true,
+      "applicationUrl": "https://localhost:5001;http://localhost:5000",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}
+```