实体框架数据库First Lookup表插入行

Question

我必须要表FundAllocation＆amp;分配

FundAllocation
    - FundAllocationId (Primary Key, Identity)
    - AllocationRefId

Allocation
    - AllocationId (Primary Key, Identity)
    - Allocation

相应的DbSets是：

public DbSet<FundAllocation> FundAllocation { get; set; }
public DbSet<Allocation> Allocation { get; set; }

以下是实体：

public class FundAllocation
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int FundAllocationId { get; set; }
    public int AllocationRefId { get; set; }
    [ForeignKey("AllocationRefId")]
    public virtual Allocation Allocation { get; set; }
}

public class Allocation
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int AllocationId { get; set; }
    [Column("Allocation")]
    public string AllocationTitle { get; set; }
}

分配表是一个查找表。 FundAllocation可以从查找表中进行分配，或者根本没有分配。但是，当我向DbSet添加新的FundAllocation（其中FundAllocation.AllocationRefIf等于现有的AllocationId）时，它会向Allocation表添加新的Allocation。如何防止将新分配添加到数据库表中？

Answer 1

我绝对不认为这是正确的方法，但下面的代码行对我有用：

dbContext.Entry<Allocation>(newFundAllocation.Allocation).State = EntityState.Unchanged;