C# LINQ to实体无法识别方法';System.DateTime转换器TimeFromUTC(System.DateTime,System.TimeZoneInfo)和#x27;方法
我有一个从数据库中提取的错误集合。时间存储为UTC,但我想将其转换为CST:C# LINQ to实体无法识别方法';System.DateTime转换器TimeFromUTC(System.DateTime,System.TimeZoneInfo)和#x27;方法,c#,linq,datetime,exception-handling,linq-to-entities,C#,Linq,Datetime,Exception Handling,Linq To Entities,我有一个从数据库中提取的错误集合。时间存储为UTC,但我想将其转换为CST: var errors = _errorsRepository.Errors. Select(e => new ErrorViewModel { ErrorId = e.ErrorId, Application = e.Application, Host = e.Host, Type = e.Type, Source =
var errors = _errorsRepository.Errors.
Select(e => new ErrorViewModel
{
ErrorId = e.ErrorId,
Application = e.Application,
Host = e.Host,
Type = e.Type,
Source = e.Source,
Message = e.Message,
User = e.User,
StatusCode = e.StatusCode,
TimeUtc = TimeZoneInfo.ConvertTimeFromUtc(
e.TimeUtc, TimeZoneInfo.FindSystemTimeZoneById("Central Standard Time")),
Sequence = e.Sequence,
AllXml = e.AllXml
});
但我得到了一个错误:
LINQ to实体无法识别方法“System.DateTime ConvertTimeFromUtc(System.DateTime,System.TimeZoneInfo)”方法,并且无法将此方法转换为存储表达式
有人知道我能做些什么来解决这个问题吗?LINQ to Entities将尝试将您的LINQ查询转换为SQL查询。由于您编写的部分内容无法转换为SQL,因此会出现此错误 您可以先使用ToList()将查询转换为内存中的对象,然后使用LINQ to Objects来获得所需的结果:
var errors = _errorsRepository.Errors.ToList().
Select(e => new ErrorViewModel
{
ErrorId = e.ErrorId,
Application = e.Application,
Host = e.Host,
Type = e.Type,
Source = e.Source,
Message = e.Message,
User = e.User,
StatusCode = e.StatusCode,
TimeUtc = TimeZoneInfo.ConvertTimeFromUtc(
e.TimeUtc, TimeZoneInfo.FindSystemTimeZoneById("Central Standard Time")),
Sequence = e.Sequence,
AllXml = e.AllXml
});
请注意,这将首先将_errorsrespository中的所有错误存储到内存中。在这种情况下,看起来这对你来说并不重要,因为你无论如何都会得到它们