相关疑难解决方法(0)

我从ReSharper收到一条关于从我的对象构造函数调用虚拟成员的警告.

为什么不做这件事？

我曾经看过一些书(例如编程实体框架代码Julia Lerman)定义了他们的域类(POCO)而没有初始化导航属性,如:

public class User
{
    public int Id { get; set; }
    public string UserName { get; set; }

    public virtual ICollection<Address> Address { get; set; }
    public virtual License License { get; set; }
}

生成POCO时,其他一些书籍或工具(例如Entity Framework Power Tools)初始化类的导航属性,如:

public class User
{
    public User()
    {
        this.Addresses = new IList<Address>();
        this.License = new License();
    }
    public int Id { get; set; }
    public string UserName { get; set; }

    public virtual ICollection<Address> Addresses { …

鉴于以下代码,EF/DbContext如何了解对客户对象所做的更改:

class Program
{
    static void Main()
    {
        using(var shopContext = new ShopContext())
        {
            var customer = shopContext.Customers.Find(7);

            customer.City = "Marion";

            customer.State = "Indiana";

            shopContext.SaveChanges();
        }
    }
}

public class ShopContext : DbContext
{
    public DbSet<Customer> Customers { get; set; }
}

public class Customer
{
    public int Id { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string City { get; set; }
    public string State { …