c# - 配置级联删除

Question

我有 8 个对象引用了一个名为 ExpenseType 的通用实体。8 个对象之间有 36 个对 ExpenseType 的引用。我想配置级联删除，以便在删除引用对象时，ExpenseType 记录也是如此。

我正在使用 Code First Entity Framework 5 并且已经为我的架构中的其他对象完成了此操作，但是这种通用性让我很难过。

非常感谢任何和所有帮助。

谢谢约翰

public class HouseholdExpenses
    {
        [Key]
        public virtual int HouseholdExpensesId { get; set; }

        [Display(Name = "Childcare")]
        public virtual ExpenseType Childcare { get; set; }

        [Display(Name = "Elderly Care (Carer Nursing Home etc)")]
        public virtual ExpenseType ElderlyCare { get; set; }

        [Display(Name = "Food / Housekeeping / Personal Care")]
        public virtual ExpenseType FoodHousekeeping { get; set; }

        [Display(Name = "Clothing and Footwear")]
        public virtual ExpenseType ClothingFootwear { get; set; }

        [Display(Name = "House Repairs and Maintenance")]
        public virtual ExpenseType RepairsAndMaintenance { get; set; }
}

    public class MedicalExpenses
    {
        [Key]
        public virtual int MedicalExpensesId { get; set; }

        [Display(Name = "Medical Expenses and Prescription Charges")]
        public virtual ExpenseType MedicalExpensesAndPrescriptions { get; set; }

        [Display(Name = "Health Insurance (unless deducted from your salary at source)")]
        public virtual ExpenseType HealthInsurance { get; set; }
}

public class ExpenseType
{
    [Key]
    public virtual int ExpenseTypeId { get; set; }

    [Display(Name = "Amount")]
    public virtual decimal? Amount { get; set; }

    [Display(Name = "Arrears")]
    public virtual decimal? Arrears { get; set; }
}

Answer 1

覆盖OnModelCreating并尝试这个。除非我忘记了我认为它应该起作用的东西。

mBuilder.Entity<ExpenseType>()
            .HasRequired(he => he.Childcare)
            .WithMany();

mBuilder.Entity<ExpenseType>()
            .HasRequired(ec => ec.ElderlyCare)
            .WithMany();
...