Entity Framework 6: Two unrelated entities mapped to same table

Question

I want to map one table to two unrelated entities: EntityBasic and EntityAdvanced. EntityAdvanced has extra business logic that I don't need for this one feature, and I would like to make a new Entity that only has fields from the table.

MyTable:

MyTableId : Guid
ParentId : Guid
Name : string
Description : string
Type : int

EntityBasic:

[Table("MyTable")]
public class EntityBasic
{
    [Key]
    public Guid MyTableId { get; set; }

    public Guid ParentId { get; set }

    public string Name { get; set; }

    public string Description { get; set; }

    public int Type { get; set; }

    [ForeignKey("ParentId")]
    public virtual List<EntityBasic> Entities{ get; set; }
}

EntityAdvanced:

[Table("MyTable")]
public class EntityAdvanced
{
    private List<EntityAdvanced> _entities;
    private List<Filter> _filters;

    [Key]
    public Guid MyTableId { get; set; }

    public Guid ParentId { get; set }

    public string Name { get; set; }

    public string Description { get; set; }

    public int Type { get; set; }

    [ForeignKey("ParentId")]
    public virtual List<EntityAdvanced> Entities
    {
        get { //Some complicated getter }
        set { //Some complicated setter }
    }

    [NotMapped]
    public string ImageUrl
    {
        get { //Some complicated getter }
        set { //Some complicated setter }
    }

    public void SetFilters(//Some parameters)
    {
        //Some logic 
    }
}

When I do this i get this error:

The entity types 'EntityAdvanced' and 'EntityBasic' cannot share table 'MyTable' because they are not in the same type hierarchy or do not have a valid one to one foreign key relationship with matching primary keys between them.

Is there a way to do what I want?

Answer 1

As a base start, your EntityAdvanced should inherit EntityBasic since they share the same base set of properties. You don't need to rewrite them. Note the extends EntityBasic .

[Table("MyTable")]
public class EntityBasic
{
    [Key]
    public Guid MyTableId { get; set; }

    public Guid ParentId { get; set }

    public string Name { get; set; }

    public string Description { get; set; }

    public int Type { get; set; }

    [ForeignKey("ParentId")]
    public virtual List<EntityBasic> Entities{ get; set; }
}

[NotMapped]
public class EntityAdvanced : EntityBasic
{    
    //[NotMapped]
    public string ImageUrl
    {
        get { //Some complicated getter }
        set { //Some complicated setter }
    }

    public void SetFilters(//Some parameters)
    {
        //Some logic 
    }
}

Using inheritence, List<EntityBasic> Entities could reference EntityAdvanced objects so you don't need anymore to declare:

[ForeignKey("ParentId")]
public virtual List<EntityAdvanced> Entities
{
    get { //Some complicated getter }
    set { //Some complicated setter }
}

You can get usefull information about implementing inheritence with Entity Framework here .

Happy coding!

Answer 2

我认为您可以使用Entity Framework 6的“表拆分”功能，在此处查看示例： https : //www.c-sharpcorner.com/UploadFile/ff2f08/table-splitting-in-entity-framework- 6-代码优先的方法/