带有 EF Core 的 LINQ 返回重复的结果

Question

我正在使用带有 LINQ 的 Entity Framework Core 来执行一些连接，但它没有按预期发生，如果选择两个对象，它会返回重复，如果我只选择一个人，则电话列表为空。我有我的对象：

public class Person{
        private string _Name;
        private string _CompanyTradeName;

        [Key, Column("pID")]
        public uint PersonID { get; set; }

        [Column("pUUID")]
        public Guid PersonUUID { get; set; }

        [Column("pType")]
        public string Type { get; set; }

        [Column("pCrptName")]
        public string Name { 
            get { return Encryption.DecryptString(_Name); } 
            set { _Name = value; } 
        }

        [Column("pCrptCompanyTradeName")]
        public string CompanyTradeName { 
            get { return (_CompanyTradeName != null) ? Encryption.DecryptString(_CompanyTradeName) : null; }
            set { _CompanyTradeName = value; } 
        }

        [Column("pProfilePicture")]
        public string ProfilePicture { get; set; }

        [Column("pStatus")]
        public bool Status { get; set; }

        public virtual ICollection<PersonAddress> PersonAddresses { get; set; }

        public virtual ICollection<PersonDoc> PersonDocs { get; set; }

        public virtual ICollection<PersonPhone> PersonPhones { get; set; }
}

我的 PersonPhone 类：

    public class PersonPhone {
        private string _PhoneNumber;

        [Key, Column("ppID")]
        public uint PersonPhoneID { get; set; }

        [Column("ppUUID")]
        public Guid PersonPhoneUUID { get; set; }

        [Column("pID")]
        public uint PersonID { get; set; }

        public PhoneType PhoneTypes { get; set; }

        [Column("ptID")]
        public uint PhoneTypeID { get; set; }

        [Column("ppCrptPhoneNumber")]
        public string PhoneNumber { get { return Encryption.DecryptString(_PhoneNumber); } set { _PhoneNumber = value; } }
    }

我正在尝试返回 PersonPhone 与 Person 的连接，但它返回 null：

var query = from p in _context.Person
            join pp in _context.PersonPhone on p.PersonID equals pp.PersonID
            select p;

            return Ok(await query.FirstOrDefaultAsync());

有人可以帮我解决这个问题吗？

Answer 1

你可以试试

var personId=...
var person= await  _context.Person
             .Where(p=>p.PersonID=personId
             .Include(p=> p.PersonPhones)
             .FirstOrDefaultAsync());
return Ok(person);

或者如果你只想要手机

var personId=...
var phones = await  _context.PersonPhones
             .Where(p=>p.PersonID=personId
             .Include(p=> p.Person)
             .ToListAsync());
return Ok(phones);

但在这种情况下，您将不得不修复类

public class PersonPhone {
        private string _PhoneNumber;

        [Key, Column("ppID")]
        public uint PersonPhoneID { get; set; }


        [Column("ppUUID")]
        public Guid PersonPhoneUUID { get; set; }

        [Column("pID")]
        public uint PersonID { get; set; }

        public virtual Person Person {get; set;}

     .....
    }