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WPF【11_2】WPF实战-重构与美化(Entity Framework)-示例

news 来源：原创 2025/5/29 9:48:32

示例：Entity Framework Core应用修改第10章(客户预约表例子)

--\Models\Customer.cs
public partial class Customer
{
public Customer()
{
Appointments = new HashSet<Appointment>();
}

public int Id { get; set; }
public string Name { get; set; }
public string IdNnumber { get; set; }
public string Address { get; set; }

public virtual ICollection<Appointment> Appointments { get; set; }
}

--\Models\Appointment.cs
public partial class Appointment
{
public int Id { get; set; }
public DateTime Time { get; set; }
public int? CustomerId { get; set; }

public virtual Customer Customer { get; set; }
}

--\Models\AppDbContext.cs
public partial class AppDbContext : DbContext
{
public AppDbContext()
{
}

public AppDbContext(DbContextOptions<AppDbContext> options)
: base(options)
{
}

public virtual DbSet<Appointment> Appointments { get; set; }
public virtual DbSet<Customer> Customers { get; set; }

protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
if (!optionsBuilder.IsConfigured)
{
optionsBuilder.UseSqlServer("Data Source=localhost;Initial Catalog=course565;Persist Security Info=True;User ID=sa;Password=PaSSword12!;Pooling=False");
}
}

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.HasAnnotation("Relational:Collation", "SQL_Latin1_General_CP1_CI_AS");

modelBuilder.Entity<Appointment>(entity =>
{
entity.Property(e => e.Time).HasColumnType("datetime");

entity.HasOne(d => d.Customer)
.WithMany(p => p.Appointments)
.HasForeignKey(d => d.CustomerId)
.HasConstraintName("FK_Appointments_Customers");
});

modelBuilder.Entity<Customer>(entity =>
{
entity.Property(e => e.Address)
.IsRequired()
.HasMaxLength(100)
.IsFixedLength(true);

entity.Property(e => e.IdNnumber)
.IsRequired()
.HasMaxLength(50)
.IsFixedLength(true);

entity.Property(e => e.Name)
.IsRequired()
.HasMaxLength(50)
.IsFixedLength(true);
});

OnModelCreatingPartial(modelBuilder);
}

partial void OnModelCreatingPartial(ModelBuilder modelBuilder);
}

--\MainWindow.xaml.cs

public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
ShowCustomers();
}

private void ShowCustomers()
{
try
{
using (var db = new AppDbContext())
{
var customers = db.Customers.ToList();
customerList.DisplayMemberPath = "Name";
customerList.SelectedValuePath = "Id";
customerList.ItemsSource = customers;
}
}
catch (Exception e)
{
MessageBox.Show(e.ToString());
}
}

private void customerList_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
try
{
Customer selectedItem = customerList.SelectedItem as Customer;
if (selectedItem == null)
{
appointmentList.ItemsSource = null;
return;
}
NameTextBox.Text = selectedItem.Name;
IdTextBox.Text = selectedItem.IdNnumber;
AddressTextBox.Text = selectedItem.Address;

using (var db = new AppDbContext())
{
var customerId = customerList.SelectedValue;
var appointment = db.Appointments.Where(a => a.CustomerId == (int)customerId).ToList();

appointmentList.DisplayMemberPath = "Time";
appointmentList.SelectedValuePath = "Id";
appointmentList.ItemsSource = appointment;
}

}
catch (Exception error)
{
MessageBox.Show(error.ToString());
}
}

private void DeleteAppointment_Click(object sender, RoutedEventArgs e)
{
try
{
var appointmentId = appointmentList.SelectedValue;

using (var db=new AppDbContext())
{
var appointmentToRmove = db.Appointments.Where(a => a.Id == (int)appointmentId).FirstOrDefault();

db.Appointments.Remove(appointmentToRmove);

db.SaveChanges();
}
}
catch (Exception error)
{
MessageBox.Show(error.ToString());
}
finally
{
customerList_SelectionChanged(null, null);
}
}

private void DeleteCustomer_Click(object sender, RoutedEventArgs e)
{
try
{
var customerId = customerList.SelectedValue;
using (var db = new AppDbContext())
{
var customerToRemove = db.Customers
.Include(c => c.Appointments)
.Where(c => c.Id == (int)customerId)
.FirstOrDefault();
db.Customers.Remove(customerToRemove);
db.SaveChanges();
}
}
catch (Exception error)
{
MessageBox.Show(error.ToString());
}
finally
{
ShowCustomers();
customerList_SelectionChanged(null, null);
}
}

private void AddCustomer_Click(object sender, RoutedEventArgs e)
{
try
{
using (var db = new AppDbContext())
{
var customer = new Customer()
{
Name = NameTextBox.Text,
IdNnumber = IdTextBox.Text,
Address = AddressTextBox.Text
};

db.Customers.Add(customer);
db.SaveChanges();
}
}
catch (Exception error)
{
MessageBox.Show(error.ToString());
}
finally
{
ShowCustomers();
}
}

private void AddAppointment_Click(object sender, RoutedEventArgs e)
{
try
{
using (var db = new AppDbContext())
{
var appointment = new Appointment()
{
Time = DateTime.Parse(AppointmentDatePicker.Text),
CustomerId = (int)customerList.SelectedValue
};

db.Appointments.Add(appointment);
db.SaveChanges();
}
}
catch (Exception error)
{
MessageBox.Show(error.ToString());
}
finally
{
customerList_SelectionChanged(null, null);
}
}

private void UpdateCustomer_Click(object sender, RoutedEventArgs e)
{
try
{
using (var db=new AppDbContext())
{
var customer = db.Customers.Where(c => c.Id == (int)customerList.SelectedValue).FirstOrDefault();

customer.Name = NameTextBox.Text.Trim();
customer.IdNnumber = IdTextBox.Text.Trim();
customer.Address = AddressTextBox.Text.Trim();

db.SaveChanges();
}

}
catch (Exception error)
{
MessageBox.Show(error.ToString());
}
finally
{
ShowCustomers();
}
}
}