Completely changes way of fetching context

ASP.Net Core/MVCBasics/Controllers/HomeController.cs

@@ -1,5 +1,6 @@
 using Microsoft.AspNetCore.Mvc;
 using System;
+using System.Linq;
 
 namespace EntityFrameworkBasics.Controllers
 {
@@ -7,6 +8,28 @@ namespace EntityFrameworkBasics.Controllers
     {
         public IActionResult Index()
         {
+            // No using statement because of the DI and IoC
+            var context = IoC.ApplicationDbContext;
+
+            context.Database.EnsureCreated();
+
+            if (!context.Settings.Any())
+            {
+                context.Settings.Add(new SettingsDataModel
+                {
+                    Name = "BackgroundColor",
+                    Value = "Red"
+                });
+
+                var SettingsLocally = context.Settings.Local.Count();
+                var SettingsDatabase = context.Settings.Count();
+
+                var firstLocal = context.Settings.Local.FirstOrDefault();
+                var firstDatabase = context.Settings.FirstOrDefault();
+
+                context.SaveChanges();
+            }
+
             return View();
         }
 

ASP.Net Core/MVCBasics/Data/ApplicationDBContext.cs

@@ -11,24 +11,26 @@ namespace EntityFrameworkBasics
     /// </summary>
     public class ApplicationDBContext : DbContext
     {
+
+        public string Id { get; set; } = Guid.NewGuid().ToString("N");
+
         #region Public properties
 
         public DbSet<SettingsDataModel> Settings { get; set; }
 
         #endregion
 
-        public ApplicationDBContext()
+        #region Constructor
+        /// <summary>
+        /// Default constructor, expecting database options passed in
+        /// </summary>
+        /// <param name="options">The database context options</param>
+        public ApplicationDBContext(DbContextOptions<ApplicationDBContext> options) : base(options)
         {
 
         }
 
-        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
+        #endregion
-        {
-            base.OnConfiguring(optionsBuilder);
-            // tfoUbuntu;User ID=sa;Password=********;Connect Timeout=30;Encrypt=False;TrustServerCertificate=False;ApplicationIntent=ReadWrite;MultiSubnetFailover=False
-            //optionsBuilder.UseSqlServer("Server=192.168.0.135;Database=entityframework;")
-            optionsBuilder.UseSqlServer("Server=192.168.0.135;Database=entityframework;User ID=sa;Password=SAtfoubuntu1SA;TrustServerCertificate=False;ApplicationIntent=ReadWrite;MultiSubnetFailover=False;MultipleActiveResultSets=true;");
-        }
 
         protected override void OnModelCreating(ModelBuilder modelBuilder)
         {

ASP.Net Core/MVCBasics/EntityFrameworkBasics.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk.Web">
+<Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
     <TargetFramework>netcoreapp2.0</TargetFramework>

ASP.Net Core/MVCBasics/IoC/IocContainer.cs

@@ -0,0 +1,26 @@
+using Microsoft.Extensions.DependencyInjection;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace EntityFrameworkBasics
+{
+    /// <summary>
+    /// A shorthand access class to get DI services with nice clean short code
+    /// </summary>
+    public static class IoC
+    {
+        public static ApplicationDBContext ApplicationDbContext => IocContainer.Provider.GetService<ApplicationDBContext>();
+    }
+    /// <summary>
+    /// The dependency Injection container making use of the built in .Net Core service provider
+    /// </summary>
+    public static class IocContainer
+    {
+        /// <summary>
+        /// The service provider for this application
+        /// </summary>
+        public static ServiceProvider Provider { get; set; }
+    }
+}

ASP.Net Core/MVCBasics/Startup.cs

@@ -4,6 +4,7 @@ using System.Linq;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Hosting;
+using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 
@@ -21,37 +22,19 @@ namespace EntityFrameworkBasics
         // This method gets called by the runtime. Use this method to add services to the container.
         public void ConfigureServices(IServiceCollection services)
         {
-            using(var context = new ApplicationDBContext())
+            // Add ApplicationDbContext to DI
-            {
+            services.AddDbContext<ApplicationDBContext>(options =>
-                context.Database.EnsureCreated();
+                options.UseSqlServer("Server=192.168.0.135;Database=entityframework;User ID=sa;Password=SAtfoubuntu1SA;TrustServerCertificate=False;ApplicationIntent=ReadWrite;MultiSubnetFailover=False;MultipleActiveResultSets=true;"));
-
-                if (!context.Settings.Any())
-                {
-                    context.Settings.Add(new SettingsDataModel
-                    {
-                        Name = "BackgroundColor",
-                        Value = "Red"
-                    });
-
-                    var SettingsLocally = context.Settings.Local.Count();
-                    var SettingsDatabase = context.Settings.Count();
-
-                    var firstLocal = context.Settings.Local.FirstOrDefault();
-                    var firstDatabase = context.Settings.FirstOrDefault();
-
-                    context.SaveChanges();
-                }
-
-
-
-            }
-
             services.AddMvc();
         }
 
         // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
-        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
+        public void Configure(IApplicationBuilder app, IHostingEnvironment env, IServiceProvider serviceProvider)
         {
+            // Store Instance of the DI service provider so our application can access it anywhere
+
+            IocContainer.Provider = (ServiceProvider)serviceProvider;
+
             if (env.IsDevelopment())
                 app.UseDeveloperExceptionPage();
             else