EF 6.0-更新与EntityState的关系。

Question

在具有以下（简化）模型的ASP.NET MVC5应用程序中：

public class Customer
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public Guid CustomerID { get; set; }
    public string Name { get; set; }
    public string PrimaryContact { get; set; }
    public string Email { get; set; }
    public string PhoneNumber { get; set; }
    public Reseller Reseller { get; set; }  
}

public class Reseller
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public Guid CompanyId { get; set; }

    public ICollection<Customer> Customers { get; set; }
}

我希望能够更新与客户关联的经销商。当尝试通过将客户实体标记为已修改（ctx.Entry(customer).State = EntityState.Modified）来更新Customer实体时，所有列均会更新，但经销商的CompanyID除外。据我了解，Modified将所有字​​段标记为肮脏并更新所有字段，但这在这里没有发生。

以下是用于更新客户的控制器操作。我已经检查并在传入模型中正确设置了转销商的正确CompanyID：

[HttpPost]
public ActionResult Edit(Customer customer)
{
    if (ModelState.IsValid)
    {
        using (var ctx = new DbContext())
        {
            ctx.Entry(customer).State = EntityState.Modified;
            ctx.SaveChanges();

            return RedirectToAction("Info", new { id = customer.CustomerID });
        }
    }

    return View(customer);
}

调用SaveChanges时，将生成以下SQL。请注意，转销商公司ID不包含在查询中：

UPDATE [dbo].[Customer]
SET [Name] = @0, [PrimaryContact] = @1, [Email] = @2, [PhoneNumber] = @3
WHERE ([CustomerID] = @4)

-- @0: 'Sample Customer iuhiuhi' (Type = String, Size = -1)

-- @1: 'Joe Bloggs' (Type = String, Size = -1)

-- @2: 'example@example.com' (Type = String, Size = -1)

-- @3: '123456789' (Type = String, Size = -1)

-- @4: 'e4b9e8d3-9f92-e811-baa4-3052cb3d0eb2' (Type = Guid)

即使它是客户实体的一部分。

Answer 1

将ResellerId添加到客户模型

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    "src",
    "-s"
  ],
  "python.linting.enabled": true,
  "autoDocstring.docstringFormat": "google"
}

然后更改ResellerId