Initial commit

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();
+    }
+  }
+}