Sql server 更新数据库efcore asp.net core时出错 名称空间LoopSquad.Core.Entities.Addresses { 公共课堂演讲 { public int AddressId{get；set；} 公共字符串非名称{get；set；} 公共字符串地址L1{get；set；} 公共字符串地址L2{get；set；} 公共字符串{get；set；} 公共字符串country{get；set；} 公共字符串邮政编码{get；set；} [外国钥匙（“客户”）] public int CustomerId{get；set；} 公共客户。客户客户{get；set；} 公共ICollection作业{get；set；} } } 命名空间LoopSquad.Core.Entities.Customers { 公共类客户 { [关键] public int CustomerId{get；set；} 公共字符串CompanyName{get；set；} [外键（“FKCustomerType”）] public int CustomerTypeId{get；set；} 公共CustomerType CustomerType{get；set；} 公共ICollection地址{get；set；} } } 命名空间LoopSquad.Core.Entities.Jobs { 公开课工作 { [关键] public int JobId{get；set；} [外国客户]] public int CustomerId{get；set；} 公共客户。客户客户{get；set；} [外键（“FKAddress”）] public int AddressId{get；set；} 公共地址。地址{get；set；} 公共日期时间BookedDateTime{get；set；} 公共日期时间CreatedDateTime{get；set；} [外键（“FKUser”）] public int UserId{get；set；} public Users.ApplicationUser ApplicationUser{get；set；} [外键（“FRoomLayout”）] public int RoomLayoutId{get；set；} 公共RoomLayout RoomLayout{get；set；} [外键（“FKJobType”）] public int JobTypeId{get；set；} public JobType JobType{get；set；} [外键（“FKLoopType”）] public int loopTypeId{get；set；} 公共LoopType LoopType{get；set；} [外键（“FKJobStatus”）] public int JobStatusId{get；set；} public JobStatus JobStatus{get；set；} } }

我重现了您的问题，这是因为您默认启用了级联删除，这将导致您的关系循环

例如，尝试在dbcontext中使用

OnDelete（DeleteBehavior.Restrict）

禁用它

namespace LoopSquad.Core.Entities.Addresses
{
    public class Address
    {
        public int AddressId { get; set; }
        public string NoName { get; set; }
        public string AddressL1 { get; set; }
        public string AddressL2 { get; set; }
        public string Town { get; set; }
        public string County { get; set; }
        public string Postcode { get; set; }
        [ForeignKey("Customer")]
        public int CustomerId { get; set; }
        public Customers.Customer Customer { get; set; }

        public ICollection<Jobs.Job> Jobs { get; set; }
    }
}


namespace LoopSquad.Core.Entities.Customers
{
    public class Customer
    {
        [Key]
        public int CustomerId { get; set; }
        public string CompanyName { get; set; }
        [ForeignKey("FKCustomerType")]
        public int CustomerTypeId { get; set; }
        public CustomerType CustomerType { get; set; }

        public ICollection<Addresses.Address> Addresses { get; set; }

    }

}

namespace LoopSquad.Core.Entities.Jobs
{
    public class Job
    {
        [Key]
        public int JobId { get; set; }

        [ForeignKey("FKCustomer")]
        public int CustomerId { get; set; }
        public Customers.Customer Customer { get; set; }

        [ForeignKey("FKAddress")]
        public int AddressId { get; set; }
        public Addresses.Address Address { get; set; }


        public DateTime BookedDateTime { get; set; }
        public DateTime CreatedDateTime { get; set; }

        [ForeignKey("FKUser")]
        public int UserId { get; set; }
        public Users.ApplicationUser ApplicationUser { get; set; }
        [ForeignKey("FRoomLayout")]
        public int RoomLayoutId { get; set; }
        public RoomLayout RoomLayout { get; set; }

        [ForeignKey("FKJobType")]
        public int JobTypeId { get; set; }
        public JobType JobType { get; set; }

        [ForeignKey("FKLoopType")]
        public int loopTypeId { get; set; }
        public LoopType LoopType { get; set; }

        [ForeignKey("FKJobStatus")]
        public int JobStatusId { get; set; }
        public JobStatus JobStatus { get; set; }
    }
}

公共类ApplicationDbContext:DbContext
{
公共应用程序上下文（DbContextOptions
请解释您获取的代码格式是什么错误？在表“Jobs”上生成外键约束“FK_Jobs_Customers_CustomerId”可能会导致循环或多个级联路径。请在删除时指定“NO ACTION”，或在更新时指定“NO ACTION”，或修改其他外键约束。无法创建约束或索引。请参阅上文s errors.PM>未能执行DbCommand（24ms）[Parameters=[]，CommandType='Text'，CommandTimeout='30']创建表[Jobs]（[JobId]int NOT NULL标识，[CustomerId]int NOT NULL，[AddressId]int NOT NULL，[BookedDateTime]datetime2 notnull，[CreatedDateTime]datetime2 notnull，[UserId]int NOT NULL，[applicationserid]nvarchar（450）NULL、[RoomLayoutId]int NOT NULL、[JobTypeId]int NOT NULL、[loopTypeId]int NOT NULL、，
public class ApplicationDbContext : DbContext
{
    public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
        : base(options)
    {
    }      

    public DbSet<Address> Addresses { get; set; }
    public DbSet<Customer> Customers { get; set; }
    public DbSet<Job> Jobs { get; set; }
    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);
        modelBuilder.Entity<Job>().HasOne(p => p.Customer)
                                  .WithMany()
                                  .HasForeignKey(p => p.CustomerId)
                                  .OnDelete(DeleteBehavior.Restrict);
    }
}