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我是实体框架的新手。我用实体模型创建了项目。当我尝试将项目添加到表中时,它会给出错误“违反多重约束”任何想法?

来自表 MAPPER 的 ID 是 MAPS 表中的 FK。

在后面的代码中:

private Mapper mMapper;
    if (mMapper.Id == 0)
                        db.Mappers.Add(mMapper);
                        db.SaveChanges();

 public partial class Mapper
    {
        public Mapper()
        {
            this.Maps = new HashSet<Map>();
        }

        public int Id { get; set; }
        public string Name { get; set; }
        public string RecordDelimiter { get; set; }
        public string ValueDelimiter { get; set; }
        public Nullable<int> ColumnDescriptionRow { get; set; }
        public Nullable<int> FirstRowOfData { get; set; }
        public Nullable<bool> IgnoreThisRecord { get; set; }
        public Nullable<bool> ExplodePartQuantity { get; set; }
        public Nullable<bool> IgnoreImportingErrors { get; set; }
        public Nullable<int> AngleMappingLeadingEdgeId { get; set; }
        public Nullable<int> AngleMappingTrailingEdgeId { get; set; }
        public string ValueWrapper { get; set; }
        public string ValueWrapperDelimiter { get; set; }

        public virtual AngleMapping AngleMapping { get; set; }
        public virtual AngleMapping AngleMapping1 { get; set; }
        public virtual ICollection<Map> Maps { get; set; }
    }

在此处输入图像描述

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