Question

我有两个实体，即客户和电子邮件。我剥夺了他们只显示重要的东西。

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; }
}

我覆盖了上下文类中的OnModelCreating（），它包含以下内容：

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");
    });

这样可以正常工作，并在数据库，客户，电子邮件和四个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，那么迁移的前几行是：

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显示以下错误：

System.Data.SqlClient.SqlException（0x80131904）：无法找到对象“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，然后它尝试将键放在不存在的表上。这似乎对我来说是错误的。这是一个错误吗？为什么要重命名dbo.CustomerMainEmails表开头？

Answer 1

尝试移动下面的RenameTable()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");

EF Code First错误地重命名表，这是一个错误吗？

1 个答案: