不可能只有一个具有关系的集合.您需要两个-一个与票证等于TicketFrom的关系，第二个与票证等于TicketTo的关系.

It's not possible to have just one collection with relations. You need two - one with relations the ticket equals TicketFrom and second with relations the ticket equals TicketTo.

类似这样的东西:

型号:

public class Ticket
{ 
    public int Id { get; set; }
    public string Title { get; set; }

    public virtual ICollection<Relation> RelatedTo { get; set; }
    public virtual ICollection<Relation> RelatedFrom { get; set; }
}

public class Relation
{
    public int FromId { get; set; }
    public int ToId { get; set; }

    public virtual Ticket TicketFrom { get; set; }
    public virtual Ticket TicketTo { get; set; }
}

配置:

modelBuilder.Entity<Relation>()
    .HasKey(e => new { e.FromId, e.ToId });

modelBuilder.Entity<Relation>()
    .HasOne(e => e.TicketFrom)
    .WithMany(e => e.RelatedTo)
    .HasForeignKey(e => e.FromId);

modelBuilder.Entity<Relation>()
    .HasOne(e => e.TicketTo)
    .WithMany(e => e.RelatedFrom)
    .HasForeignKey(e => e.ToId);

请注意，使用父级的解决方案并不等效，因为它会创建one-to-many关联，而如果我理解正确，那么您正在寻找many-to-many.

Note that a solution using Parent is not equivalent, because it would create one-to-many association, while if I understand correctly you are seeking for many-to-many.