使用实体框架过滤内部/级联实体

Question

I have below class structure,

public partial class Class1 : BaseEntity
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public Guid Id { get; set; }

    [Required]
    [StringLength(100)]
    public string Name { get; set; }

    [Required]
    [StringLength(500)]
    public string Description { get; set; }
    public virtual ICollection<Class2> Class2s  { get; set; }

}


public partial class Class2 : BaseEntity
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public Guid Id { get; set; }

    [Required]
    [StringLength(100)]
    public string Name { get; set; }

    [StringLength(500)]
    public string Description { get; set; }

    [Required]
    [ForeignKey("Class1")]
    public Guid Class1_Id  { get; set; }
    public virtual Class1 Class1 { get; set; }
}

public class BaseEntity
{
    public BaseEntity()
    {
        Meta = new MetaData();
    }
    public MetaData Meta  { get; set; }
}

public sealed class MetaData
{
    public bool Active { get; set; }
    public DateTimeOffset Created { get; set; }
    public DateTimeOffset? Modified { get; set; }

    public MetaData()
    {
        Created = DateTime.UtcNow;
        Active = true;
    }
}

Now using EF,

var dbContext.Class1
.Include(x=>x.Class2)
where (x=>x.Meta.Active)

Now I want to load/filter/get all active class2 entities using above query.

I have tried to apply filter on .Include(x=>x.Class2).Where(y=>y.Meta.Active)

but it apply only on Class1. I want to filter all active class2 entities.

Please help. Thanks in Advance.

Answer 1

To filter navigation property collection you can use method Query . It looks like this:

context.Entry(blog) 
    .Collection(b => b.Posts) 
    .Query() 
    .Where(p => p.Tags.Contains("entity-framework") 
    .Load();

Or you can do the following:

dbContext.Class1
    .Select(s => new {class1 = s, navigationProps = s.Class2s.Where(w => w.Meta.Active)})
    .AsEnumerable()
    .Select(s => s.class1);