Question

我最近出现了这个错误，我不知道我错了什么

错误：System.InvalidOperationException：'实体类型为Customer 不属于当前背景模型的一部分。'

当我运行代码

时，错误出现在列表（客户）中

模型连接到具有客户表

的SQL数据库

需要帮助的原因我不能继续使用该程序。致谢

主程序

static StoreSalesHandlingNewEntities1 db = new StoreSalesHandlingNewEntities1();

public static string ShowMenu()
{
    Console.Clear();
    List<Customer> customerList = db.Customer.ToList();
    foreach (Customer c in customerList)
    {
        Console.WriteLine(c.ToString());
    }
    Console.WriteLine();
    Console.WriteLine("1.. Login");
    Console.WriteLine("2.. Register");
    Console.WriteLine("3.. Exit");
    return Console.ReadLine();

}

上下文

public partial class StoreSalesHandlingNewEntities1 : DbContext
{
    public StoreSalesHandlingNewEntities1()
        : base("name=StoreSalesHandlingNewEntities1 ")
    {
    }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        throw new UnintentionalCodeFirstException();
    }

    public virtual DbSet<Customer> Customer { get; set; }
    public virtual DbSet<Employee> Employee { get; set; }
    public virtual DbSet<Product> Product { get; set; }
    public virtual DbSet<Order> Order { get; set; }
}

客户

public partial class Customer
{
    public string Name { get; set; }
    public string Surname { get; set; }
    public string IDNumber { get; set; }
    public string EmailAddress { get; set; }
    public string HomeAddress { get; set; }
    public int MobileNumber { get; set; }
    public string Username { get; set; }
    public string Password { get; set; }

    public override string ToString()
    {
        return string.Format("Name: {0}, Surname: {1}, ID Number: {2}, Email: {3}, Address: {4}, Mobile: {5}, Username: {6}, Password: {7}",
            Name, Surname, IDNumber, EmailAddress, HomeAddress, MobileNumber, Username, Password);
    }
}

Answer 1

如果您的表未在启动时创建，这就是原因。您需要在OnModelCreating方法覆盖中告诉DbContext它们。

您可以在此处执行自定义按实体映射，也可以将它们分离为单独的EntityTypeConfiguration类。

将它放在自定义DbContext类中：

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    modelBuilder.Entity<Customer>().ToTable("Customer");
}

错误 - 模型不是当前上下文的一部分

1 个答案: