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()中得到此错误:

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.RequiredNavigationPropertyConfiguration'的第一个参数可以找到(你错过了使用指令或程序集引用？)D:\ Work\C#Projects\Visual Studio 2010\Windows\WPF\New folder\Accounting没有EF代码\会计 - 复制\ 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.

样品

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);
    }
}