EF代码首先级联删除和更新? [英] EF Code First cascade delete and update?
问题描述
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; }
}
这是我的上下文:
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()
i get this error in WillCascadeOnDelete():
错误1'System.Data.Entity.ModelConfiguration.Configuration.RequiredNavigationPropertyConfiguration'不包含'WillCascadeOnDelete '并且没有扩展方法'WillCascadeOnDelete'接受类型'System.Data.Entity.ModelConfiguration.Configuration.RequiredNavigationPropertyConfiguration'的第一个参数可以找到(你缺少一个using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First\Accounting - Copy\DAL.EF.CodeFirst\Entities\Context\AccountingContext.cs 22 22 DAL .EF.CodeFirst
Error 1 'System.Data.Entity.ModelConfiguration.Configuration.RequiredNavigationPropertyConfiguration' does not contain a definition for 'WillCascadeOnDelete' and no extension method 'WillCascadeOnDelete' accepting a first argument of type 'System.Data.Entity.ModelConfiguration.Configuration.RequiredNavigationPropertyConfiguration' could be found (are you missing a using directive or an assembly reference?) D:\Work\C# Projects\Visual Studio 2010\Windows\WPF\New folder\Accounting Without EF Code First\Accounting - Copy\DAL.EF.CodeFirst\Entities\Context\AccountingContext.cs 22 22 DAL.EF.CodeFirst
我想删除客户级联付款(只要客户被删除) 。我如何才能在EF代码中实现这一点?
i want to delete payments of the customer cascading (Just if customer getting deleted). how can i achieve this in EF code first?
我也想使用级联更新。
请帮我解决这些问题。
thanx。
also i want to use cascade update. please help me in these issues. thanx.
推荐答案
描述
在您的上下文中配置modelBuilder。
Description
You need to configure the modelBuilder in your context.
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);
}
}
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