3

我有两个实体，客户和电子邮件。我已经剥离了它们以仅显示重要的内容。

public class Customer
{
    [DatabaseGenerated(DatabaseGeneratedOption.None)]
    [StringLength(6)]
    public string Id { get; set; }

    [Required]
    [StringLength(50)]
    public string Name { get; set; }

    //Relationships
    public ICollection<Email> MainEmails { get; set; }
    public ICollection<Email> OrderEmails { get; set; }
    public ICollection<Email> InvoiceEmails { get; set; }
    public ICollection<Email> APEmails { get; set; }
}

public class Email
{
    [Key]
    [StringLength(50)]  
    public string Address { get; set; }

    public ICollection<Customer> MainCustomers { get; set; }
    public ICollection<Customer> OrderCustomers { get; set; }
    public ICollection<Customer> InvoiceCustomers { get; set; }
    public ICollection<Customer> APCustomers { get; set; }
}

我在我的上下文类中覆盖了 OnModelCreating() ，它包括以下内容：

modelBuilder.Entity<Customer>()
    .HasMany(e => e.MainEmails)
    .WithMany(c => c.MainCustomers)
    .Map(m =>
    {
        m.ToTable("CustomerMainEmails");
        m.MapLeftKey("CustomerId");
        m.MapRightKey("Address");
    });

modelBuilder.Entity<Customer>()
    .HasMany(e => e.OrderEmails)
    .WithMany(c => c.OrderCustomers)
    .Map(m =>
    {
        m.ToTable("CustomerOrderEmails");
        m.MapLeftKey("CustomerId");
        m.MapRightKey("Address");
    });

modelBuilder.Entity<Customer>()
    .HasMany(e => e.InvoiceEmails)
    .WithMany(c => c.InvoiceCustomers)
    .Map(m =>
    {
        m.ToTable("CustomerInvoiceEmails");
        m.MapLeftKey("CustomerId");
        m.MapRightKey("Address");
    });

modelBuilder.Entity<Customer>()
    .HasMany(e => e.APEmails)
    .WithMany(c => c.APCustomers)
    .Map(m =>
    {
        m.ToTable("CustomerAPEmails");
        m.MapLeftKey("CustomerId");
        m.MapRightKey("Address");
    });

这工作正常，并在 DB、Customers、Emails 和四个 M2M 表、CustomerAPEmails、CustomerInvoiceEmails、CustomerMainEmails 和 CustomerOrderEmails 中创建五个表。

现在，如果我尝试将 Email 实体重命名为 CustomerEmail 并执行迁移，迁移中的前几行是：

RenameTable(name: "dbo.CustomerMainEmails", newName: "CustomerEmails");
DropForeignKey("dbo.CustomerMainEmails", "CustomerId", "dbo.Customers");
DropForeignKey("dbo.CustomerMainEmails", "Address", "dbo.Emails");
DropForeignKey("dbo.CustomerOrderEmails", "CustomerId", "dbo.Customers");

执行更新数据库然后失败并出现以下错误：

System.Data.SqlClient.SqlException (0x80131904)：找不到对象“dbo.CustomerMainEmails”，因为它不存在或您没有权限。

我认为原因是表被重命名，然后它尝试在不存在的表上删除键。这对我来说似乎是错误的。它是一个错误吗？为什么要重命名 dbo.CustomerMainEmails 表开头？

4

1 回答 1

1

尝试移动RenameTable()下面的方法

DropForeignKey("dbo.CustomerMainEmails", "CustomerId", "dbo.Customers");
DropForeignKey("dbo.CustomerMainEmails", "Address", "dbo.Emails");
DropForeignKey("dbo.CustomerOrderEmails", "CustomerId", "dbo.Customers");
RenameTable(name: "dbo.CustomerMainEmails", newName: "CustomerEmails");
于 2013-03-18T15:33:52.470 回答