EF：导航属性不是类型上的声明属性 [英] EF: The navigation property is not a declared property on type

问题描述

我对这为什么不起作用一无所知，似乎上周才起作用，而且我对这些课程没有任何改变。有人可以让我知道为什么会出现错误：

I am very clueless as to why this isn't working, it seems to work just last week, and I am not seeing any changes to these classes. Can someone please let me know why I get the error:

导航属性 Node不是类型为$ b的声明的属性$ b'NWatchRelation'。请验证该模型尚未明确从
中排除，并且它是有效的导航属性。

"The navigation property 'Node' is not a declared property on type 'NWatchRelation'. Verify that it has not been explicitly excluded from the model and that it is a valid navigation property."

NWatchRelation实体

public class NWatchRelation : INWatchRelation
    {
        private NWatchRelation()
        {
        }

        public NWatchRelation(int nodeId, int relatedNodeId)
        {
            NodeId = nodeId;
            RelatedNodeId = relatedNodeId;
        }

        public NWatchRelation(NWatchNode node, NWatchNode relatedNode)
        {
            Node = node;
            RelatedNode = relatedNode;
        }

        public int Id { get; set; }

        /// <summary>
        /// Foreign Key for Node
        /// </summary>
        public int NodeId { get; set; }

        /// <summary>
        /// Node
        /// </summary>
        public NWatchNode Node { get; set; }

        /// <summary>
        /// Foreign Key for RelatedNode
        /// </summary>
        public int RelatedNodeId { get; set; }

        /// <summary>
        /// Related Node
        /// </summary>
        public NWatchNode RelatedNode { get; set; }

        /// <summary>
        /// Relationship Type
        /// </summary>
        public NWatch.NWatchRelationType RelationType { get; set; }

        INWatchNode INWatchRelation.Node
        {
            get
            {
                return Node;
            }
        }

        INWatchNode INWatchRelation.RelatedNode
        {
            get
            {
                return RelatedNode;
            }
        }
    }

配置

// NWatchRelation
            modelBuilder.Entity<NWatchRelation>().Map(m =>
            {
                m.ToTable("NWatchRelations");
            });
            modelBuilder.Entity<NWatchRelation>()
                .HasKey(t => t.Id)
                .Property(t => t.Id)
                .HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
            modelBuilder.Entity<NWatchRelation>().HasRequired(t => t.Node).
                WithMany().HasForeignKey(t => t.NodeId).WillCascadeOnDelete(false);
            modelBuilder.Entity<NWatchRelation>().HasRequired(t => t.RelatedNode).
                WithMany().HasForeignKey(t => t.RelatedNodeId).WillCascadeOnDelete(false);

推荐答案

我认为您必须指定外键属性，如果您将其视为导航属性

I think you have to specify the foreign key attribute if you consider it as navigation property

 [ForeignKey("Node"), Column(Order = 0)] 
 public int NodeId { get; set; }

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