Creating an EF Core DbContext and a service implementation that works…

… with the context

OdeToFoodRider/OdeToFoodRider/Data/OdeToFoodDbContext.cs

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+using Microsoft.EntityFrameworkCore;
+using OdeToFoodRider.Models;
+
+namespace OdeToFoodRider.Data
+{
+    public class OdeToFoodDbContext : DbContext
+    {
+        public OdeToFoodDbContext(DbContextOptions options) : base(options) { }
+
+        public DbSet<Restaurant> Restaurants { get; set; }
+    }
+}

OdeToFoodRider/OdeToFoodRider/Services/SqlRestaurantData.cs

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+using System.Collections.Generic;
+using System.Linq;
+using OdeToFoodRider.Data;
+using OdeToFoodRider.Models;
+
+namespace OdeToFoodRider.Services
+{
+    class SqlRestaurantData : IRestaurantData
+    {
+        private OdeToFoodDbContext _context;
+
+        public SqlRestaurantData(OdeToFoodDbContext context)
+        {
+            _context = context;
+        }
+
+        public Restaurant Add(Restaurant restaurant)
+        {
+            _context.Restaurants.Add(restaurant);
+            _context.SaveChanges();
+            return restaurant;
+        }
+
+        public Restaurant Get(int id)
+        {
+            return _context.Restaurants.FirstOrDefault(r => r.Id == id);
+        }
+
+        public IEnumerable<Restaurant> GetAll()
+        {
+            return _context.Restaurants.OrderBy(r => r.Name);
+        }
+    }
+}

OdeToFoodVisualStudio/OdeToFoodVisualStudio/Data/OdeToFoodDbContext.cs

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+using Microsoft.EntityFrameworkCore;
+using OdeToFoodVisualStudio.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace OdeToFoodVisualStudio.Data
+{
+    public class OdeToFoodDbContext : DbContext
+    {
+        public OdeToFoodDbContext(DbContextOptions options) : base(options) {}
+
+        public DbSet<Restaurant> Restaurants { get; set; }
+    }
+}

OdeToFoodVisualStudio/OdeToFoodVisualStudio/Services/SqlRestaurantData.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using OdeToFoodVisualStudio.Data;
+using OdeToFoodVisualStudio.Models;
+
+namespace OdeToFoodVisualStudio.Services
+{
+    public class SqlRestaurantData : IRestaurantData
+    {
+        private OdeToFoodDbContext _context;
+
+        public SqlRestaurantData(OdeToFoodDbContext context)
+        {
+            _context = context;
+        }
+
+        public Restaurant Add(Restaurant restaurant)
+        {
+            _context.Restaurants.Add(restaurant);
+            _context.SaveChanges();
+            return restaurant;
+        }
+
+        public Restaurant Get(int id)
+        {
+            return _context.Restaurants.FirstOrDefault(r => r.Id == id);
+        }
+
+        // Possible performance issues if returning an IEnumerable with large data sets - IQueryable is performance-safer
+        public IEnumerable<Restaurant> GetAll()
+        {
+            return _context.Restaurants.OrderBy(r => r.Name);
+        }
+    }
+}