我正在尝试使用 Controller 列出一些食品。我将存储库模式与 UnitOfWork 一起用于另一个程序集中的数据,并在 BaseApiController 中引用它。 Data 属性是我的 UnitOfWork 实例。
var result = Data.Food
.FindAll()
.Select(FoodItemViewModel.Create);
return result;
这是我的 ViewModel:
public static Expression<Func<FoodItem, FoodItemViewModel>> Create
{
get
{
return fi => new FoodItemViewModel
{
Id = fi.Id,
Description = fi.Description,
DiaryEntries = fi.DiaryEntries
.Select(s => new DiaryEntityViewModel()
{
Id = s.Id,
Quantity = s.Quantity
}
};
}
}
但我得到的只是:
"The specified type member 'DiaryEntries' is not supported in LINQ to Entities. Only initializers, entity members, and entity navigation properties are supported."
我在 ViewModel 中的 DiaryEntries 成员是
IEnumerable<DiaryEntityViewModel>
我在 Data 实例中的 DiaryEntries 成员是
IRepository<DiaryEntry>
DiaryEntry 是我的模型类
这是我的 FoodItem 模型类:
public class FoodItem
{
private IEnumerable<Measure> measures;
private IEnumerable<DiaryEntry> diaryEntries;
public FoodItem()
{
this.measures = new HashSet<Measure>();
this.diaryEntries = new HashSet<DiaryEntry>();
}
public int Id { get; set; }
public string Description { get; set; }
public virtual IEnumerable<DiaryEntry> DiaryEntries
{
get
{
return this.diaryEntries;
}
set
{
this.diaryEntries = value;
}
}
public virtual IEnumerable<Measure> Measures
{
get
{
return this.measures;
}
set
{
this.measures = value;
}
}
}
最佳答案
改变你FoodItem
类到下面的, IEnumerable<T>
不支持作为导航集合的类型:
public class FoodItem
{
public FoodItem()
{
this.Measures = new HashSet<Measure>();
this.DiaryEntries = new HashSet<DiaryEntry>();
}
public int Id { get; set; }
public string Description { get; set; }
public virtual ICollection<DiaryEntry> DiaryEntries
{
get;
set;
}
public virtual ICollection<Measure> Measures
{
get;
set;
}
}
关于c# - EF - LINQ to Entities 不支持,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/39667220/