EF Code First级联删除和更新？

Question

我的实体是：

public class Customer
{
    public Customer()
    {
        Invoices = new List<Invoice>();
        Payments = new List<Payment>();
    }

    public int ID { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }

    public IList<Payment> Payments { get; set; }
}

public class Payment
{
    public int ID { get; set; }
    public int CustomerID { get; set; }
    public decimal CreditPrice { get; set; }
    public decimal DebitPrice { get; set; }
    public DateTime PaymentDate { get; set; }

    [ForeignKey("CustomerID")]
    public Customer Customer { get; set; }
}

这是我的背景：

public class AccountingContext : DbContext, IDisposable
{
    public DbSet<Customer> Customers { get; set; }
    public DbSet<Payment> Payments { get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();

        modelBuilder.Entity<Payment>()
                .HasRequired(s => s.Customer)
                .WillCascadeOnDelete();

        base.OnModelCreating(modelBuilder);
    }
}

我在 WillCascadeOnDelete（）中收到此错误：

  

错误1'System.Data.Entity.ModelConfiguration.Configuration.RequiredNavigationPropertyConfiguration'不包含'WillCascadeOnDelete'的定义，也没有扩展方法'WillCascadeOnDelete'接受类型'System.Data.Entity.ModelConfiguration.Configuration的第一个参数可以找到.RequiredNavigationPropertyConfiguration'（你是否缺少using指令或程序集引用？）D：\ Work \ C＃Projects \ Visual Studio 2010 \ Windows \ WPF \ New folder \ Accounting没有EF Code First \ Accounting - Copy \ DAL。 EF.CodeFirst \ Entities \ Context \ AccountingContext.cs 22 22 DAL.EF.CodeFirst

我想删除客户级联的付款（只是客户被删除）。我怎样才能在EF代码中实现这一目标？

我也想使用级联更新。 请帮助我解决这些问题。 感谢名单。

Answer 1

描述

您需要在上下文中配置modelBuilder。

示例

public class AccountingContext : DbContext, IDisposable
{
    public DbSet<Customer> Customers { get; set; }
    public DbSet<Payment> Payments { get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();

        modelBuilder.Entity<Payment>()
                .HasRequired(s => s.Customer)
                .WithMany()
                .WillCascadeOnDelete(true);

        base.OnModelCreating(modelBuilder);
    }
}