c# - 在 Entity Framework 核心中获取无效的列名称'EmploymentTypeEntityEmploymentTypeID

Question

我收到以下错误。

消息:Microsoft.EntityFrameworkCore.DbUpdateException:更新条目时出错。有关详细信息，请参阅内部异常。 ----> System.Data.SqlClient.SqlException:列名“EmploymentTypeEntityEmploymentTypeID”无效。

很奇怪，因为它结合了我的实体类名称和实体属性名称。

下面是我的代码。

SystemTest.cs

   using (var transaction = _referenceDataDbContext.Database.BeginTransaction())
            {
                _referenceDataDbContext.EmploymentType.AddRangeAsync(

                    new EmploymentTypeEntity
                    {
                        EmploymentTypeID = 1,
                        EmploymentType = "EmploymentType",
                        CategoryTypeID = 27,

                        SiteAddress = null,
                        CreatedBy = "UnitTest",
                        CreatedOn = DateTime.Now,
                        ModifiedBy = "UnitTest",
                        ModifiedOn = DateTime.Now,
                        RowVersion = new RowVersion(1),
                        EmploymentTypeGroups = new[]
                        {
                        new EmploymentTypeGroupEntity
                        {
                            EmploymentTypeGroupID = 11, GroupName = "Child Care", IsActive = true
                        }
                        }
                    }

                    }
                );

                _referenceDataDbContext.Database.ExecuteSqlCommand("SET IDENTITY_INSERT [ref].[EmploymentType] ON");

                _referenceDataDbContext.SaveChanges();
            }

EmploymentTypeGroup.cs

  public class EmploymentTypeGroupEntity
    {
        [Key]
        public int? EmploymentTypeGroupID { get; set; }
        public string GroupName { get; set; }
        public bool? IsActive { get; set; }
        public DateTime? CreatedOn { get; set; }
        public string CreatedBy { get; set; }
        public DateTime? ModifiedOn { get; set; }
        public string ModifiedBy { get; set; }

        [Timestamp]
        [ConcurrencyCheck]
        public byte[] RowVersion { get; set; }

    }

EmploymentType.cs

public class EmploymentTypeEntity
    {
        [Key]
        public int? EmploymentTypeID { get; set; }
        public string EmploymentType { get; set; }
        public int? CategoryTypeID { get; set; }

        public bool? SiteAddress { get; set; }
        public IEnumerable<EmploymentTypeGroupEntity> EmploymentTypeGroups { get; set; }
        public DateTime? CreatedOn { get; set; }
        public string CreatedBy { get; set; }
        public DateTime? ModifiedOn { get; set; }
        public string ModifiedBy { get; set; }

        [Timestamp]
        [ConcurrencyCheck]
        public byte[] RowVersion { get; set; }
    }

DataDbContext.cs

public class ReferenceDataDbContext : DbContext
    {
        public ReferenceDataDbContext(DbContextOptions<ReferenceDataDbContext> options)
            : base(options)
        {
        }

        public ReferenceDataDbContext()
        {

        }


        public virtual DbSet<EmploymentTypeEntity> EmploymentType { get; set; }
        public virtual DbSet<EmploymentTypeGroupEntity> EmploymentTypeGroup { get; set; }

        protected override void OnModelCreating(ModelBuilder builder)
        {
            builder.Entity<StateEntity>().ToTable("State", "ref");
            builder.Entity<EmploymentTypeGroupEntity>().ToTable("EmploymentTypeGroup", "ref");
            builder.Entity<EmploymentTypeEntity>().ToTable("EmploymentType","ref").HasMany(a => a.EmploymentTypeGroups);

            // Configure database attributes
        }
    }

Answer 1

您正在创建 EmploymentTypeGroupEntity 之间的关系和 EmploymentTypeEntity .但是您没有告诉 Entity Framework 这种关系是什么。 EF 已经猜到您想要对 EmploymentTypeEntity 的引用在你的EmploymentTypeGroupEntity表并为此创建了一个字段。这显然不是您想要的。

你需要告诉EF这个关系是什么。如果是一对多关系，其中一个 EmploymentTypeEntity可以有很多 EmploymentTypeGroupEntity的，这似乎是因为您定义了:

public IEnumerable<EmploymentTypeGroupEntity> EmploymentTypeGroups { get; set; }

您还需要在 EmploymentTypeGroupEntity 中创建外键类(class)。所以添加到这个类:

public int EmploymentTypeEntityID { get; set; }

[ForeignKey(nameof(EmploymentTypeEntityID))]
public EmploymentTypeEntity EmploymentTypeEntity  { get; set; }

在你的EmploymentTypeEntity类更改集合类型:

public ICollection<EmploymentTypeGroupEntity> EmploymentTypeGroups { get; set; }

添加一个构造函数来分配一个new List<EmploymentTypeGroupEntity>()至 EmploymentTypeGroups .

更改测试中的数组分配以添加到集合中并将外键添加到组创建中。