我正在使用 Entity Framework 4.3（代码优先）测试 Knockout 2.1.0 和 Upshot 1.0.0.2，并遇到以下错误：
{“类型 'System.Collections.Generic.HashSet`1[[KnockoutTest.Models.Person, KnockoutTest, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]]' 的对象图包含循环，如果引用则无法序列化跟踪已禁用。"}
我正在使用一个相当典型的模型来测试一些基本的父子实体。
public class Client
{
public Client()
{
Projects = new HashSet<Project>();
Persons = new HashSet<Person>();
}
[Key]
public int ClientId { get; set; }
[Required]
[Display(Name = "Client Name", Description = "Client's name")]
[StringLength(30)]
public string Name { get; set; }
public ICollection<Project> Projects { get; set; }
public ICollection<Person> Persons { get; set; }
}
public class Project
{
public Project()
{
}
[Key]
public int ProjectId { get; set; }
[StringLength(40)]
public string Name { get; set; }
public int? ClientId { get; set; }
public virtual Client Client { get; set; }
}
public class Person
{
public Person()
{
PhoneNumbers=new HashSet<PhoneNumber>();
}
[Key]
public int PersonId { get; set; }
[Required]
[Display(Name="First Name", Description = "Person's first name")]
[StringLength(15)]
public string FirstName { get; set; }
[Required]
[Display(Name = "First Name", Description = "Person's last name")]
[StringLength(15)]
public string LastName { get; set; }
[ForeignKey("HomeAddress")]
public int? HomeAddressId { get; set; }
public Address HomeAddress { get; set; }
[ForeignKey("OfficeAddress")]
public int? OfficeAddressId { get; set; }
public Address OfficeAddress { get; set; }
public ICollection<PhoneNumber> PhoneNumbers { get; set; }
public int? ClientId { get; set; }
public virtual Client Client { get; set; }
}
public class Address
{
[Key]
public int AddressId { get; set; }
[Required]
[StringLength(60)]
public string StreetAddress { get; set; }
[Required]
[DefaultValue("Laurel")]
[StringLength(20)]
public string City { get; set; }
[Required]
[DefaultValue("MS")]
[StringLength(2)]
public string State { get; set; }
[Required]
[StringLength(10)]
public string ZipCode { get; set; }
}
public class PhoneNumber
{
public PhoneNumber()
{
}
[Key]
public int PhoneNumberId { get; set; }
[Required]
[Display(Name = "Phone Number", Description = "Person's phone number")]
public string Number { get; set; }
[Required]
[Display(Name = "Phone Type", Description = "Type of phone")]
[DefaultValue("Office")]
public string PhoneType { get; set; }
public int? PersonId { get; set; }
public virtual Person Person { get; set; }
}
我的上下文非常笼统。
public class KnockoutContext : DbContext
{
public DbSet<Client> Clients { get; set; }
public DbSet<Project> Projects { get; set; }
public DbSet<Person> Persons { get; set; }
public DbSet<Address> Addresses { get; set; }
public DbSet<PhoneNumber> PhoneNumbers { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
}
}
我也有一些样本数据——尽管它不应该是相关的。
protected override void Seed(KnockoutContext context)
{
base.Seed(context);
context.Clients.Add(new Client
{
Name = "Muffed Up Manufacturing",
Persons = new List<Person> {
new Person {FirstName = "Jack", LastName = "Johnson",
PhoneNumbers = new List<PhoneNumber>
{
new PhoneNumber {Number="702-481-0283", PhoneType = "Office"},
new PhoneNumber {Number = "605-513-0381", PhoneType = "Home"}
}
},
new Person { FirstName = "Mary", LastName = "Maples",
PhoneNumbers = new List<PhoneNumber>
{
new PhoneNumber {Number="319-208-8181", PhoneType = "Office"},
new PhoneNumber {Number = "357-550-9888", PhoneType = "Home"}
}
},
new Person { FirstName = "Danny", LastName = "Doodley",
PhoneNumbers = new List<PhoneNumber>
{
new PhoneNumber {Number="637-090-5556", PhoneType = "Office"},
new PhoneNumber {Number = "218-876-7656", PhoneType = "Home"}
}
}
},
Projects = new List<Project>
{
new Project {Name ="Muffed Up Assessment Project"},
new Project {Name ="New Product Design"},
new Project {Name ="Razor Thin Margins"},
new Project {Name ="Menial Managerial Support"}
}
}
);
context.Clients.Add(new Client
{
Name = "Dings and Scrapes Carwash",
Persons = new List<Person> { new Person {FirstName = "Fred", LastName = "Friday"},
new Person { FirstName = "Larry", LastName = "Lipstick" },
new Person { FirstName = "Kira", LastName = "Kwikwit" }
},
Projects = new List<Project>
{
new Project {Name ="Wild and Crazy Wax Job"},
new Project {Name ="Pimp Ride Detailing"},
new Project {Name ="Saturday Night Special"},
new Project {Name ="Soapy Suds Extra"}
}
}
);
IEnumerable<DbEntityValidationResult> p = context.GetValidationErrors();
if (p != null)
{
foreach (DbEntityValidationResult item in p)
{
Console.WriteLine(item.ValidationErrors);
}
}
}
}
基本上，每当我尝试使用来自客户、人员、项目等的“包含”时，我都会收到与上面列出的错误类似的错误。
namespace KnockoutTest.Controllers
{
public class ClientController : DbDataController<KnockoutTest.Models.KnockoutContext>
{
public IQueryable<Client> GetClients()
{
return DbContext.Clients.Include("Persons").OrderBy(o => o.Name);
}
}
public class ProjectController : DbDataController<KnockoutTest.Models.KnockoutContext>
{
public IQueryable<Project> GetProjects()
{
return DbContext.Projects.OrderBy(o => o.Name);
}
}
public class PersonController : DbDataController<KnockoutTest.Models.KnockoutContext>
{
public IQueryable<Person> GetPersons()
{
return DbContext.Persons.Include("Client").OrderBy(o => o.LastName);
}
}
public class AddressController : DbDataController<KnockoutTest.Models.KnockoutContext>
{
public IQueryable<Address> GetAddresses()
{
return DbContext.Addresses.OrderBy(o => o.ZipCode);
}
}
public class PhoneNumberController : DbDataController<KnockoutTest.Models.KnockoutContext>
{
public IQueryable<PhoneNumber> GetPhoneNumbers()
{
return DbContext.PhoneNumbers.OrderBy(o => o.Number);
}
}
}
你能看出 .NET 应该抱怨这个模型的任何原因吗？
无论如何，我必须解决哪些选项？
感谢您的任何帮助！