Entity Framework Basics

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

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+using Microsoft.AspNetCore.Mvc;
+using System.Linq;
+
+namespace EntityFrameworkBasics.Controllers
+{
+    public class HomeController : Controller
+    {
+        #region Protected Members
+
+        /// <summary>
+        /// The scoped Application context
+        /// </summary>
+        protected ApplicationDbContext mContext;
+
+        #endregion
+
+        #region Constructor
+
+        /// <summary>
+        /// Default constructor
+        /// </summary>
+        /// <param name="context">The injected context</param>
+        public HomeController(ApplicationDbContext context)
+        {
+            mContext = context;
+        }
+
+        #endregion
+
+        public IActionResult Index()
+        {
+            // Make sure we have the database
+            mContext.Database.EnsureCreated();
+
+            // If we have no settings already...
+            if (!mContext.Settings.Any())
+            {
+                // Add a new setting
+                mContext.Settings.Add(new SettingsDataModel
+                {
+                    Name = "BackgroundColor",
+                    Value = "Red"
+                });
+
+                // Check to show the new setting is currently only local and not in the database
+                var settingsLocally = mContext.Settings.Local.Count();
+                var settingsDatabase = mContext.Settings.Count();
+                var firstLocal = mContext.Settings.Local.FirstOrDefault();
+                var firstDatabase = mContext.Settings.FirstOrDefault();
+
+                // Commit setting to database
+                mContext.SaveChanges();
+
+                // Recheck to show its now in local and the actual database
+                settingsLocally = mContext.Settings.Local.Count();
+                settingsDatabase = mContext.Settings.Count();
+                firstLocal = mContext.Settings.Local.FirstOrDefault();
+                firstDatabase = mContext.Settings.FirstOrDefault();
+            }
+
+            return View();
+        }
+    }
+}

ASP.Net Core/EntityFrameworkBasics/Data/ApplicationDbContext.cs

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+using Microsoft.EntityFrameworkCore;
+using System;
+
+namespace EntityFrameworkBasics
+{
+    /// <summary>
+    /// The database representational model for our application
+    /// </summary>
+    public class ApplicationDbContext : DbContext
+    {
+        #region Public Properties
+
+        /// <summary>
+        /// The settings for the application
+        /// </summary>
+        public DbSet<SettingsDataModel> Settings { get; set; }
+
+        #endregion
+
+        #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)
+        {
+
+        }
+
+        #endregion
+
+        protected override void OnModelCreating(ModelBuilder modelBuilder)
+        {
+            base.OnModelCreating(modelBuilder);
+
+            // Fluent API
+
+            modelBuilder.Entity<SettingsDataModel>().HasIndex(a => a.Name);
+        }
+    }
+}

ASP.Net Core/EntityFrameworkBasics/Data/SettingsDataModel.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace EntityFrameworkBasics
+{
+    /// <summary>
+    /// Our Settings database table representational model
+    /// </summary>
+    public class SettingsDataModel
+    {
+        /// <summary>
+        /// The unique Id for this entry
+        /// </summary>
+        [Key]
+        public string Id { get; set; }
+
+        /// <summary>
+        /// The settings name
+        /// </summary>
+        /// <remarks>This column is indexed</remarks>
+        [Required]
+        [MaxLength(256)]
+        public string Name { get; set; }
+
+        /// <summary>
+        /// The settings value
+        /// </summary>
+        [Required]
+        [MaxLength(2048)]
+        public string Value { get; set; }
+    }
+}

ASP.Net Core/EntityFrameworkBasics/EntityFrameworkBasics.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp2.0</TargetFramework>
+    <Platforms>AnyCPU</Platforms>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Content Remove="wwwroot\style.xaml" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.AspNetCore.All" Version="2.0.3" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <DotNetCliToolReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Tools" Version="2.0.1" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Folder Include="wwwroot\" />
+  </ItemGroup>
+
+</Project>

ASP.Net Core/EntityFrameworkBasics/EntityFrameworkBasics.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+VisualStudioVersion = 15.0.27130.2010
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "EntityFrameworkBasics", "EntityFrameworkBasics.csproj", "{B6C91DFF-E4A2-4DD3-A357-F8BECCCA183A}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{B6C91DFF-E4A2-4DD3-A357-F8BECCCA183A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B6C91DFF-E4A2-4DD3-A357-F8BECCCA183A}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B6C91DFF-E4A2-4DD3-A357-F8BECCCA183A}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B6C91DFF-E4A2-4DD3-A357-F8BECCCA183A}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {75575559-DA47-4D16-803A-735E85EACA3D}
+	EndGlobalSection
+EndGlobal

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

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+using Microsoft.Extensions.DependencyInjection;
+using System;
+
+namespace EntityFrameworkBasics
+{
+    /// <summary>
+    /// A shorthand access class to get DI services with nice clean short code
+    /// </summary>
+    public static class IoC
+    {
+        /// <summary>
+        /// The scoped instance of the <see cref="ApplicationDbContext"/>
+        /// </summary>
+        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/EntityFrameworkBasics/Program.cs

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+using Microsoft.AspNetCore;
+using Microsoft.AspNetCore.Hosting;
+using System.IO;
+
+namespace EntityFrameworkBasics
+{
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            BuildWebHost(args).Run();
+        }
+
+        public static IWebHost BuildWebHost(string[] args)
+        {
+            return WebHost.CreateDefaultBuilder()
+                .UseStartup<Startup>()
+                .Build();
+        }
+    }
+}

ASP.Net Core/EntityFrameworkBasics/Properties/launchSettings.json

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+{
+  "profiles": {
+    "test": {
+      "commandName": "Project",
+      "launchBrowser": true,
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      },
+      "applicationUrl": "http://localhost:5000/"
+    }
+  }
+}

ASP.Net Core/EntityFrameworkBasics/Startup.cs

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+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using System;
+
+namespace EntityFrameworkBasics
+{
+    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)
+        {
+            // Add ApplicationDbContext to DI
+            services.AddDbContext<ApplicationDbContext>(options =>
+                options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));
+
+            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, 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
+                app.UseExceptionHandler("/Home/Error");
+
+            app.UseStaticFiles();
+
+            app.UseMvc(routes =>
+            {
+                routes.MapRoute(
+                    name: "default",
+                    template: "{controller=Home}/{action=Index}/{moreInfo?}");
+
+                routes.MapRoute(
+                    name: "aboutPage",
+                    template: "more",
+                    defaults: new { controller = "About", action = "TellMeMore" });
+            });
+        }
+    }
+}

ASP.Net Core/EntityFrameworkBasics/Views/Home/Index.cshtml

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+<h1>Hello World</h1>

ASP.Net Core/EntityFrameworkBasics/Views/Shared/_Layout.cshtml

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+<!DOCTYPE html>
+<html lang="en-GB">
+<head>
+    <meta charset="utf-8">
+    <title>Title</title>
+</head>
+<body>
+    @RenderBody()
+</body>
+</html>

ASP.Net Core/EntityFrameworkBasics/Views/_ViewImports.cshtml

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+@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers

ASP.Net Core/EntityFrameworkBasics/Views/_ViewStart.cshtml

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+@{
+    Layout = "_Layout";
+}

ASP.Net Core/EntityFrameworkBasics/appsettings.Development.json

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+{
+  "Logging": {
+    "IncludeScopes": false,
+    "LogLevel": {
+      "Default": "Debug",
+      "System": "Information",
+      "Microsoft": "Information"
+    }
+  }
+}

ASP.Net Core/EntityFrameworkBasics/appsettings.json

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+{
+  "ConnectionStrings": {
+    "DefaultConnection": "Server=.;Database=entityframework;Trusted_Connection=True;MultipleActiveResultSets=true"
+  },
+
+  "Logging": {
+    "IncludeScopes": false,
+    "LogLevel": {
+      "Default": "Warning"
+    }
+  }
+}