EF 代码优先级联删除和更新

本文关键字：删除 更新 级联 代码 EF | 更新日期: 2023-09-27 18:33:36

我的实体是这些：

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，并且找不到接受类型为"System.Data.Entity.ModelConfiguration.Configuration.Configuration.RequiredNavigationPropertyConfiguration"的第一个参数的扩展方法"WillCascadeOnDelete"(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 Without EF Code First''Accounting - Copy''DAL.英 孚。CodeFirst''Entities''Context''AccountingContext.cs 22 22 DAL.英 孚。代码优先

我想删除客户级联的付款(只是在客户被删除的情况下(。 如何首先在 EF 代码中实现此目的？

我也想使用级联更新。请在这些问题上帮助我。谢谢。

EF 代码优先级联删除和更新

说明

您需要在上下文中配置模型构建器。

样本

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);
    }
}

在模型创建方法上，您需要进行如下更改 

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
            //Disabling Delete Cascade
            foreach (var foreignKey in modelBuilder.Model.GetEntityTypes().SelectMany(model=>model.GetForeignKeys()))
            {
                //Disabling Delete Cascade on Each Entities
                foreignKey.DeleteBehavior = DeleteBehavior.Restrict;
            }
}
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