在一个linq查询中使用了平均值聚合函数Average,结果报错 System.InvalidOperationException Sequence contains no elements (序列不包含任何元素) 也就是说,使用某些linq的函数时,如果值不存在是会报错的,比如:First() Single() FirstAsync() SingleAsync() Last() LastAsync() Max() Min() Average() 等,解决方案...
打开空白文档，菜单 文件-->选项 -->加载项，在弹出的窗口中最下面，点击 "转到..."；然后禁止所有加载项即可。
20产品问题付款单反审核报错Sequence contains no elements确认一下，就这一张有问题，还是所有的都这样，...
Finally, the difference betweenFirst()andTake(1)is thatFirst()returns the element itself, whileTake(1)returns a sequence of elements that contains exactly one element. .First()will throw an exception if there's no row to be returned, while.FirstOrDefault()will return the default value (NULL...
数据表只有一个自增列,如图代码执行插入。 在执行ExecuteCommand时异常: System.InvalidOperationException:“Sequence contains no elements” 在System.Linq.ThrowHelper.ThrowNoElementsException() 在System.Linq.Enumerable.First[TSource](IEnumerable`1 source) ...
使用EF 报错System.InvalidOperationException: Sequence contains no elements出现这个错误可能是entity.Sale_...
When trying to open the last opened iBase Database from iBase User or from Analyst's Notebook, this error message is displayed :"Sequence contains no elements"Details :System.InvalidOperationException: Sequence contains no elements. at System
When you start playing with LINQ queries over sequences of elements (e.g. getting min / max value for enumerable source) sooner or later you will come across this one -- the InvalidOperationException (“Sequence contains no elements”). ...
Today I got an exception saying "Sequence contains no elements " when using LINQ against Windows Azure tables. I did a quick search and found that it is due to that I used First<> instead of FirstOrDefault<> in my code. The below link explains the issue....
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 ...