Question

我遇到EF7反向属性的问题。有两个实体像这样连接。

public class Employee
    {
        public int Id { get; set; }
    }

public class Review
{
    public int Id { get; set; }

    [Required]
    public virtual Employee Employee { get; set; }

    [Required]
    public Employee Manager { get; set; }
 }

我想在开始查询员工时访问评论列表，所以我尝试这样做：

public class Employee
    {
        public Employee()
        {
            Reviews = new List<Review>();
        }
        public int Id { get; set; }

        [InverseProperty("Employee")]
        public virtual ICollection<Review> Reviews { get; set; }
    }

这样，查询效果不佳并返回此错误：

Invalid column name 'EmployeeId1'。

这是查询的一部分，其中包含错误：

SELECT [ua].[Id], [r].[EmployeeId], [r].[EmployeeId1], [r1].[EmployeeId], [r1].[EmployeeId1]
FROM [UserAssessment] AS [ua]
LEFT JOIN [Review] AS [r] ON [ua].[ReviewId] = [r].[Id]
LEFT JOIN [Review] AS [r1] ON [ua].[ReviewId] = [r1].[Id]

任何人都知道我该怎么做？

更新

此语句正在生成查询：

return this.DbSet
.Include(ua => ua.Employee).ThenInclude(t => t.Role)
.Include(ua => ua.Review).ThenInclude(rt => rt.ReviewType)
.Include(ua => ua.Review).ThenInclude(rt => rt.Manager).ThenInclude(r => r.Role)

我必须使用相同的includes访问，因为EF7上还没有延迟加载。

Answer 1

您需要在员工和审核

上使用 InverseProperty

public class Review
{
    public int Id { get; set; }

    [Required]
    [InverseProperty("Reviews")]
    public Employee Employee { get; set; }

    [Required]
    public Employee Manager { get; set; }
 }

public class Employee
    {
        public int Id { get; set; }

        [InverseProperty("Employee")]
        public ICollection<Review> Reviews { get; set; }
    }

应该有效。我有一个类似的设置，它创建导航而不创建任何新的字段。如果这不起作用，请告诉我，我将启动一个测试项目。

另请注意，EF7当前忽略虚拟，这与EF6中的含义不同。

InverseProperty Entity Framework 7

1 个答案: