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: 使用空...
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。
string unexpected = expectedCapturedKeyCodes.Where(key => key == keyCode).First(); } 空集合时,从First()处 Throw the exceptoins. 修改: First() => FirstOrDefault(),然后对返回String做null判断。
汗,弄错了,引发异常的是前面一行代码,即下面第1行代码
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.InvalidOperationException: Sequence contains no elements>...
{"Sequence contains no elements"} at System.Linq.ThrowHelper.ThrowNoElementsException() at System.Linq.Enumerable.First[TSource](IEnumerable`1 source) at SqlSugar.SqlServerInsertBuilder.ToSqlString() at SqlSugar.InsertableProvider`1._ExecuteCommand() at SqlSugar.InsertableProvider`1.ExecuteCommand()收...
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) ...
dotnet : Unhandled exception. System.InvalidOperationException: Sequence contains no elements At line:1 char:1 + dotnet stryker + ~~~ + CategoryInfo : NotSpecified: (Unhandled excep...ins no elements:String) [], RemoteException + FullyQualifiedErrorId : NativeCommandError at System.Linq.ThrowHelpe...
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.https...
请问是什么软件导入EXCEL出现的提示,这句话的意思是序列中不包含任何元素。应该是软件提取EXCEL表内容时没有找到内容所以提示的。解决方法是观看说明文件得知正确使用方法在重新导入。