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[英]EF 4: The specified type member '*' is not supported in LINQ to Entities
[英]EF - not supported in LINQ to Entities
我试图用控制器列出一些食品。 我将Repository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:
“LINQ to Entities不支持指定的类型成员'DiaryEntries'。仅支持初始值设定项,实体成员和实体导航属性。”
我在ViewModel中的DiaryEntries成员是
IEnumerable<DiaryEntityViewModel>
和我的数据实例中的DiaryEntries成员是
IRepository<DiaryEntry>
和DiaryEntry是我的模特课
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;
}
}
}
将FoodItem
类更改为下面的类, 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;
}
}
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