[英]Why do I get this error when I try to open an MDF database via path/filename in Entity Framework?
[英]Entity Framework : when I filter by exact datetime, I get an error
我正在使用实体框架,我想从数据库中过滤一些数据。 当我尝试这样做时:
编辑:我想按日期字段进行实时搜索。
如果我写了 10 输出必须:
生日包含 10 的所有行。 例如:
2020年12月10日,二○二○年十月一十日,二〇二〇年十月一十二日,12.12.2010
我试过
1) var sm = _db.SomeModel.Include(d => d.OtherModel).AsQueryable();
sm.Where(x => x.birthday.toString("dd.MM.yyyy").contains(birthday));
2) var sm = _db.SomeModel.Include(d => d.OtherModel).AsQueryable();
sm.Where(x => EF.Functions.Like(x.birthday.toString("dd.MM.yyyy"), $"%{birthday}%"));
我的型号:
public partial class Customer
{
public int Id {get; set;}
public int ContactInfoId {get; set;}
public string Lastname {get; set;}
public string Firstname {get; set;}
public DateTime? Birthday {get; set;}
public ContactInfo Contact {get; set;}
}
public partial class ContactInfo
{
public int Id {get; set;}
public int TypeId {get; set;}
public string Email {get; set;}
public EmailType Type {get; set;}
}
public partial class EmailType
{
public int Id {get; set;}
public string value {get; set;}
}
和我的控制器
var cust = _db.Customer.Include(e => e.ContactInfo).ThenInclude(e => e.EmailType).OrderBy(e => e.Lastname).AsQueryable();
cust = cust.Where(d => !d.Birthday.HasValue || (Convert.ToDateTime(d.Birthday).ToString("dd.MM.yyyy").Contains(birthday.toString)));
我收到一个 SQL 错误。
如何按确切的日期时间格式过滤?
错误是
.Where(c => !(c.Outer.Outer.Outer.Birthday.HasValue) || Convert.ToDateTime((objet)c.Outer.Outer.Outer.Birthday).ToString("dd.MM.yyyy").Contains() couldnt be translated
如果我正确理解您的数据模型,您应该使用以下内容:
DateTime birthdayForSearch = DateTime.ParseExact(birthday, "dd.MM.yyyy", CultureInfo.InvariantCulture).Date;
_db.SomeModel.Where(x => x.birthday.Date == birthdayForSearch)
试试这个代码:
var sm = _db.SomeModel.ToList()
.Where(x => Convert.ToDateTime(x.birthday).ToString("dd.MM.yyyy").Contains(birthday));
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