Ria服务和导航属性问题

我在使用Silverlight4、Ria服务和实体框架时遇到了一个问题。

从我的sl客户端我尝试通过ria服务获取一些数据，在我的domainService类中这个方法被调用:

public IQueryable<LastMinuteWachtLijstPromotie> GetLastMinuteWachtLijstPromoties(){
  IQueryable<LastMinuteWachtLijstPromotie> list = (IQueryable<LastMinuteWachtLijstPromotie>)this.ObjectContext.LastMinuteWachtLijstPromoties.Include("Promotie");
  return (from LastMinuteWachtLijstPromotie lwmp in list where lwmp.Actief select lwmp);
}

当我检查列表的内容时，在调试模式下，它被类型为LastMinuteWachtLijstPromotie的对象填充。这些对象有一个导航属性，指向一个名为Promotie的对象。并且我可以访问这些Promotie对象的属性。

在silverlight客户端上，当加载完成时调用一个方法:

public void OnLoadEntitiesCompleted(ServiceLoadResult<T> result) {
}

在这个方法中，我得到所有请求的LastMinuteWachtLijstPromotie对象，如预期的属性Promotie为空。

我在自动生成的元数据类中的Promotie属性上设置了[Include]标签我使用。include ("Promotie")

这些相同的方法用于不同的对象从我的领域模型，这工作完美。此外，我似乎找不到.edmx文件与数据库映射和导航属性的差异。

有人遇到同样的问题或知道解决方案吗?

[MetadataTypeAttribute(typeof(LastMinuteWachtLijstPromotie.LastMinuteWachtLijstPromotieMetadata))]
        public partial class LastMinuteWachtLijstPromotie
        {
            // This class allows you to attach custom attributes to properties
            // of the LastMinuteWachtLijstPromotie class.
            //
            // For example, the following marks the Xyz property as a
            // required property and specifies the format for valid values:
            //    [Required]
            //    [RegularExpression("[A-Z][A-Za-z0-9]*")]
            //    [StringLength(32)]
            //    public string Xyz { get; set; }
            internal sealed class LastMinuteWachtLijstPromotieMetadata
            {
                // Metadata classes are not meant to be instantiated.
                private LastMinuteWachtLijstPromotieMetadata()
                {
                }
                public int AlertId { get; set; }
                public string ArtikelNummer { get; set; }
                public Nullable<int> ArtikelVariant { get; set; }
                public int LastMinuteWachtLijstPromotieId { get; set; }
                [Include]
                public Promotie Promotie { get; set; }
                public int PromotieArtikelId { get; set; }
                public int PromotieId { get; set; }
                public bool Actief { get; set; }
                public DateTime Aanmaakdatum { get; set; }
            }
        }

        [MetadataTypeAttribute(typeof(Promotie.PromotieMetadata))]
    public partial class Promotie
    {
        // This class allows you to attach custom attributes to properties
        // of the Promotie class.
        //
        // For example, the following marks the Xyz property as a
        // required property and specifies the format for valid values:
        //    [Required]
        //    [RegularExpression("[A-Z][A-Za-z0-9]*")]
        //    [StringLength(32)]
        //    public string Xyz { get; set; }
        internal sealed class PromotieMetadata
        {
            // Metadata classes are not meant to be instantiated.
            private PromotieMetadata()
            {
            }
            public string ActieType { get; set; }
            public string AssortimentsManagerNaam { get; set; }
            public string AssortimentsManagerTeamIds { get; set; }
            [Display(Name = "Commerciele tekst")]
            [Required(ErrorMessageResourceName = "Required", ErrorMessageResourceType = typeof(Nokavision.ReclameFolder.UI.Web.Resources.ValidationResources))]            
            public string CommercieleTekst { get; set; }
            [Display(Name = " ")]
            public string CommercieleTekstDetails { get; set; }
            [Include]
            public Frame Frame { get; set; }
            public Nullable<int> FrameId { get; set; }
            public Nullable<DateTime> LastMinuteWijzigingsDatum { get; set; }
            public string Opmerkingen { get; set; }
            [Display(Name = "Op wachtlijst")]
            public Nullable<bool> OpWachtLijst { get; set; }
            //public Nullable<int> PromotieCopyId { get; set; }
            public int PromotieId { get; set; }
            [Include]
            public EntityCollection<PromotieLeverancier> PromotieLeveranciers { get; set; }
            [Include]
            public EntityCollection<PromotieMutatie> PromotieMutaties{ get; set; }
            //public Nullable<int> PromotieOrigineleId { get; set; }
            [Include]
            public EntityCollection<PromotieSymbool> PromotieSymbolen { get; set; }
            public string Status { get; set; }
            [Display(Name = "Promotie inhoud")]
            public string PromotieInhoud { get; set; }
            [Display(Name = "Promotie eenheid")]
            public string PromotieEenheid { get; set; }
            [Display(Name = "Promotie prijs")]
            public decimal PromotiePrijs { get; set; }
        }
    }