实体框架6：多对多关系问题[关闭]

Question

我正在努力处理子表的多对多关系。 EF6

表1：

Id int
Name string

表2：

Id int
ParentId int fk
ChildId int fk

Table2 中有两个指向 Table1 的链接 - ChildId 和 ParentId，它们是 Table1 中的 Id 的外键。 Entity Framework在调用时会正确更新ParentId，但是将ChildId更新为Table1 Id的ParentId？

public partial class GeographicPolygon : IPublishingEntity
{       
    public GeographicPolygon()
    {            
        this.GeographicPolygonLinkParents = new HashSet<GeographicPolygonLink>();
        this.GeographicPolygonLinkChildren = new HashSet<GeographicPolygonLink>();
    }

    public int Id { get; set; }
    public System.Guid InternalId { get; set; }        
    public string Name { get; set; }        
        
    [InverseProperty("GeographicPolygonParent")] 
    public virtual ICollection<GeographicPolygonLink> GeographicPolygonLinkParents { get; set; }
    
    [InverseProperty("GeographicPolygonChild")] 
    public virtual ICollection<GeographicPolygonLink> GeographicPolygonLinkChildren { get; set; }
}

public partial class GeographicPolygonLink : IEntity
{        
    public int Id { get; set; }                
    public int ParentId { get; set; }
    public int ChildId { get; set; }        

    [ForeignKey("ChildId")] 
    public virtual GeographicPolygon GeographicPolygonChild { get; set; }

    [ForeignKey("ParentId")] 
    public virtual GeographicPolygon GeographicPolygonParent { get; set; }
}

传入的数据。

{
  "Id": 3,
  "Name": "New GeoPoly 2",    
  "GeographicPolygonLinkChildren": [
    {
      "ParentId": 3,
      "ChildId": 10,
    },
    {
      "ParentId": 3,
      "ChildId": 11,
    }
  ]
}

更新的调用是：

var internalId = Guid.Parse(document.InternalId);
var existing = await context.Set<TTarget>().FirstOrDefaultAsync(x => x.InternalId == internalId);
if (existing == null)
{
    existing = new TTarget {CreatedDate = DateTime.Now};
    context.Set<TTarget>().Add(existing);
}

mapper.Map(document, existing);

await context.SaveChangesAsync();

我在更新之前查看“现有”，并且 Id 都是正确的。 ChildId 的 10 和 11。

在 SaveChangeAsync 之后数据库有：

ID   ParentId  ChildId
320  3         3
321  3         3

即使有注释，我也无法正确更新 ChildId。

在我的模型构建器中，我有：

builder.EntitySet<GeographicPolygonModel>("GeographicPolygon");
builder.EntitySet<GeographicPolygonLinkModel>("GeographicPolygonLink");

我的 edmx 有：

<EntityType Name="GeographicPolygon">
  <Key>
    <PropertyRef Name="Id" />
  </Key>
  <Property Name="Id" Type="Int32" Nullable="false" />          
  <Property Name="Name" Type="String" Nullable="false" />                    
  <NavigationProperty Name="GeographicPolygonLinkParents" Relationship="DataContext.fkGeographicPolygonLinkParentId_GeographicPolygon" FromRole="GeographicPolygon" ToRole="GeographicPolygonLink" />
  <NavigationProperty Name="GeographicPolygonLinkChildren" Relationship="DataContext.fkGeographicPolygonLinkChildId_GeographicPolygon" FromRole="GeographicPolygon" ToRole="GeographicPolygonLink" />
</EntityType>

我看了又看，但我尝试过的都没有奏效？

有什么想法吗？

Answer 1

尝试添加导航属性

public partial class GeographicPolygonLink : IEntity
{        
    public int Id { get; set; }                
    public int ParentId { get; set; }
    public int ChildId { get; set; }        

    
    [ForeignKey(nameof(ChildId))]
   [InverseProperty(nameof(GeographicPolygon.GeographicPolygonLinkChildren))]
    public virtual GeographicPolygon GeographicPolygonChild { get; set; }

    [ForeignKey(nameof(ParentId))]
    [InverseProperty(nameof(GeographicPolygon.GeographicPolygonLinkParents))]
    public virtual GeographicPolygon GeographicPolygonParent { get; set; }
}


public partial class GeographicPolygon : IPublishingEntity
{       
   ...... 
        
   
  [InverseProperty(nameof(GeographicPolygonLink.GeographicPolygonParent))]
    public virtual ICollection<GeographicPolygonLink> GeographicPolygonLinkParents { get; set; }
    
    [InverseProperty(nameof(GeographicPolygonLink.GeographicPolygonChild))] 
    public virtual ICollection<GeographicPolygonLink> GeographicPolygonLinkChildren { get; set; }
}