LINQ to Entities 不支持指定的类型成员“Date".只有初始值设定项、实体成员和实体导航属性 [英] The specified type member 'Date' is not supported in LINQ to Entities. Only initializers, entity members, and entity navigation properties
问题描述
在实体框架中使用此代码时,我收到以下错误.我需要获取特定日期的所有行,DateTimeStart
是这种格式的 DataType 类型 2013-01-30 12:00:00.000
Using this code in Entity Framework I receive the following error. I need to get all the rows for a specific date, DateTimeStart
is of type DataType in this format 2013-01-30 12:00:00.000
代码:
var eventsCustom = eventCustomRepository.FindAllEventsCustomByUniqueStudentReference(userDevice.UniqueStudentReference)
.Where(x => x.DateTimeStart.Date == currentDateTime.Date);
<小时>
错误:
base {System.SystemException} = {"指定的类型成员 'Date' 是LINQ to Entities 不支持.只有初始值设定项、实体成员、并且支持实体导航属性."}
base {System.SystemException} = {"The specified type member 'Date' is not supported in LINQ to Entities. Only initializers, entity members, and entity navigation properties are supported."}
有什么解决办法吗?
推荐答案
DateTime.Date
无法转换为 SQL.使用 EntityFunctions.TruncateTime 方法获取日期部分.
DateTime.Date
cannot be converted to SQL. Use EntityFunctions.TruncateTime method to get date part.
var eventsCustom = eventCustomRepository
.FindAllEventsCustomByUniqueStudentReference(userDevice.UniqueStudentReference)
.Where(x => EntityFunctions.TruncateTime(x.DateTimeStart) == currentDate.Date);
更新:正如@shankbond 在评论中提到的,在实体框架 6 EntityFunctions
已过时,您应该使用 DbFunctions
类,随实体框架一起提供.
UPDATE: As @shankbond mentioned in comments, in Entity Framework 6 EntityFunctions
is obsolete, and you should use DbFunctions
class, which is shipped with Entity Framework.
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