Initial commit

vscode/PracticalApps/Northwind.BlazorServer/Data/INorthwindService.cs

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+namespace Packt.Shared;
+
+public interface INorthwindService
+{
+  Task<List<Customer>> GetCustomersAsync();
+  Task<List<Customer>> GetCustomersAsync(string country);
+  Task<Customer?> GetCustomerAsync(string id);
+  Task<Customer> CreateCustomerAsync(Customer c);
+  Task<Customer> UpdateCustomerAsync(Customer c);
+  Task DeleteCustomerAsync(string id);
+}

vscode/PracticalApps/Northwind.BlazorServer/Data/NorthwindService.cs

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+using Microsoft.EntityFrameworkCore;
+
+namespace Packt.Shared;
+
+public class NorthwindService : INorthwindService
+{
+  private readonly NorthwindContext db;
+
+  public NorthwindService(NorthwindContext db)
+  {
+    this.db = db;
+  }
+
+  public Task<List<Customer>> GetCustomersAsync()
+  {
+    return db.Customers.ToListAsync();
+  }
+
+  public Task<List<Customer>> GetCustomersAsync(string country)
+  {
+    return db.Customers.Where(c => c.Country == country).ToListAsync();
+  }
+
+  public Task<Customer?> GetCustomerAsync(string id)
+  {
+    return db.Customers.FirstOrDefaultAsync
+      (c => c.CustomerId == id);
+  }
+
+  public Task<Customer> CreateCustomerAsync(Customer c)
+  {
+    db.Customers.Add(c);
+    db.SaveChangesAsync();
+    return Task.FromResult(c);
+  }
+
+  public Task<Customer> UpdateCustomerAsync(Customer c)
+  {
+    db.Entry(c).State = EntityState.Modified;
+    db.SaveChangesAsync();
+    return Task.FromResult(c);
+  }
+
+  public Task DeleteCustomerAsync(string id)
+  {
+    Customer? customer = db.Customers.FirstOrDefaultAsync
+      (c => c.CustomerId == id).Result;
+
+    if (customer == null)
+    {
+      return Task.CompletedTask;
+    }
+    else
+    {
+      db.Customers.Remove(customer);
+      return db.SaveChangesAsync();
+    }
+  }
+}

vscode/PracticalApps/Northwind.BlazorServer/Data/WeatherForecast.cs

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+namespace Northwind.BlazorServer.Data
+{
+  public class WeatherForecast
+  {
+    public DateTime Date { get; set; }
+
+    public int TemperatureC { get; set; }
+
+    public int TemperatureF => 32 + (int)(TemperatureC / 0.5556);
+
+    public string? Summary { get; set; }
+  }
+}

vscode/PracticalApps/Northwind.BlazorServer/Data/WeatherForecastService.cs

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+namespace Northwind.BlazorServer.Data
+{
+  public class WeatherForecastService
+  {
+    private static readonly string[] Summaries = new[]
+    {
+        "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
+    };
+
+    public Task<WeatherForecast[]> GetForecastAsync(DateTime startDate)
+    {
+      return Task.FromResult(Enumerable.Range(1, 5).Select(index => new WeatherForecast
+      {
+        Date = startDate.AddDays(index),
+        TemperatureC = Random.Shared.Next(-20, 55),
+        Summary = Summaries[Random.Shared.Next(Summaries.Length)]
+      }).ToArray());
+    }
+  }
+}