一、在.Net Core中使用Ef的聚合函数报错: 类似函数: 1,使用FirstOrDefault() 来代替 First() 2、使用SingleOrDefault 来代替 Single 3、使用 ElementAtOrDefault 来代替 .ElementAt 4、如果是在Average, Sum等中报错 错误如下: Sequence contains no elements 二、在.Net Core的 内存列表 Linq 聚合函数解决方案 v...
一、在.Net Core中使用Ef的聚合函数报错: 类似函数: 1,使用FirstOrDefault() 来代替 First() 2、使用SingleOrDefault 来代替 Single 3、使用 ElementAtOrDefault 来代替 .ElementAt 4、如果是在Average, Sum等中报错 错误如下: Sequence contains no elements 二、在.Net Core的 内存列表 Linq 聚合函数解决方案 v...
出现这个错误可能是entity.Sale_ReturnGoodsNote的值为null，建议检查一下EF的相关设置。
EF Core Sequence contains no elements 2020-04-03 10:57 −... 天马3798 1 5963 EF core mysql 2019-12-05 20:20 −导入 Pomelo.EntityFrameworkCore.MySql public class BloggingContext : DbContext { public DbSet<Blog> Blogs { get; set; } publ... ...
Executed DbCommand (16ms) [Parameters=[], CommandType='Text', CommandTimeout='30'] SELECT MAX([s].[Id]) FROM [Sys_User] AS [s] WHERE [s].[Id] < 0 Unhandled exception. System.InvalidOperationException: Sequence contains no elements. ...
Both: using var db = new CarrierMoblieDb(); db.PrimaryTransportMedia.Any(x => x.Selected); and even this: db.PrimaryTransportMedia.Where(x => x.Selected).ToQueryString(); are throwing "System.InvalidOperationException: 'Sequence contains...
[Id]<0Unhandled exception.System.InvalidOperationException:Sequence contains noelements.atlambda_method7(Closure,QueryContext,DbDataReader,ResultContext,SingleQueryResultCoordinator)at Microsoft.EntityFrameworkCore.Query.Internal.SingleQueryingEnumerable`1.Enumerator.MoveNext()inMicrosoft.EntityFrameworkCore....
ShardingCore 一款efcore下高性能、轻量级针对分表分库读写分离的解决方案,具有零依赖、零学习成本、零业务代码入侵。 既然是基于EFcore的零业务代码入侵,那肯定要对Efcore进行扩展替换,我们直接从入口找找 在ShardingCoreExtension中,我们新增了shardingcode的服务,这里做了大量的依赖注入,其中UseDefaultSharding是对EFCORE...
I've just applied this, it has certainly fixed the “Sequence contains no elements bug” which we were experiencing in beta 1. I am interested to know, having previously been on the June 2011 CTP, should I expect to see performance increases with EF 5 compared with the aforementioned CTP?
I've just applied this, it has certainly fixed the “Sequence contains no elements bug” which we were experiencing in beta 1. I am interested to know, having previously been on the June 2011 CTP, should I expect to see performance increases with EF 5 compared with the aforementioned CTP?