方法无法转换为商店表达式

Question

方法无法转换为商店表达式

我看到这个代码使用LINQ to SQL，但是当我使用Entity Framework时，它会抛出此错误：

LINQ to Entities无法识别方法'System.Linq.IQueryable'1 [MyProject.Models.CommunityFeatures] GetCommunityFeatures（）'方法，并且此方法无法转换为商店表达式。

存储库代码是这样的：

public IQueryable<Models.Estate> GetEstates(){
    return from e in entity.Estates
           let AllCommFeat = GetCommunityFeatures()
           let AllHomeFeat = GetHomeFeatures()
           select new Models.Estate
                      {
                                EstateId = e.EstateId,
                                AllHomeFeatures = new LazyList<HomeFeatures>(AllHomeFeat),
                                AllCommunityFeatures = new LazyList<CommunityFeatures>(AllCommFeat)
                      };}public IQueryable<Models.CommunityFeatures> GetCommunityFeatures(){
    return from f in entity.CommunityFeatures
           select new CommunityFeatures
                      {
                          Name = f.CommunityFeature1,
                          CommunityFeatureId = f.CommunityFeatureId
                      };}public IQueryable<Models.HomeFeatures> GetHomeFeatures(){
    return from f in entity.HomeFeatures
           select new HomeFeatures()
           {
               Name = f.HomeFeature1,
               HomeFeatureId = f.HomeFeatureId
           };}

LazyList是一个扩展IQueryable功能的List。

有人能解释为什么会出现这种错误吗