我首先使用 EF 4.3 代码并使用 WCF 数据服务（刚刚发布的 5.0）通过 HTTP 公开数据我发现如果我从浏览器调用服务操作，我可以取回相关实体，但是当我使用客户端应用程序中的服务操作我没有取回相关实体。我一直在研究这个问题，似乎 EF 在引用 ICollection 时使用虚拟关键字启用延迟加载，这在某种程度上阻止了 WCF 数据服务返回实际实体 - 这是真的吗如果我在本地浏览并设置断点我的 getUsersByName 方法我可以看到相关的组实体，但是当它通过线路连接到客户端应用程序时，组实体丢失了。是否有启用此功能的配置。
谢谢，例如
public partial class Group
{
public Group()
{
this.Users = new HashSet<User>();
}
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int GroupID { get; set; }
[Required(ErrorMessage = "Please enter a group name")]
[StringLength(50, ErrorMessage = "The group name is too long")]
public string GroupName { get; set; }
[Required]
public System.DateTime CreatedDate { get; set; }
[Required]
public bool Admin { get; set; }
public virtual ICollection<User> Users { get; set; }
}
public partial class User
{
public User()
{
this.Groups = new HashSet<Group>();
}
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int UserID { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
[Required(ErrorMessage="Please enter a username")]
[StringLength(50,ErrorMessage="Username is too long")]
public string UserName { get; set; }
[Required(ErrorMessage="Please enter an email address")]
[RegularExpression(".+\\@.+\\..+",ErrorMessage="Please enter a valid email address")]
public string Email { get; set; }
[Required]
public System.DateTime CreatedDate { get; set; }
public virtual ICollection<Group> Groups { get; set; }
}
public partial class TestContext : DbContext
{
public Test()
: base("name=TestEntities")
{
}
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
// Tell Code First to ignore PluralizingTableName convention
// If you keep this convention then the generated tables will have pluralized names.
modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
}
public DbSet<Group> Groups { get; set; }
public DbSet<User> Users { get; set; }
}
[ServiceBehavior(IncludeExceptionDetailInFaults=true)]
[JSONPSupportBehavior]
public class TestSVC : DataService<TestContext>
{
// This method is called only once to initialize service-wide policies.
public static void InitializeService(DataServiceConfiguration config)
{
config.SetEntitySetAccessRule("*", EntitySetRights.All);
config.SetServiceOperationAccessRule("*", ServiceOperationRights.All);
config.SetServiceActionAccessRule("*", ServiceActionRights.Invoke);
config.DataServiceBehavior.MaxProtocolVersion = DataServiceProtocolVersion.V3;
config.UseVerboseErrors = true;
}
[WebGet]
public User GetUserByName(string userName)
{
var user = (from u in this.CurrentDataSource.Users
where u.UserName == userName
select u).FirstOrDefault();
return user;
}