ef core 报错："Nullable object must have a value"
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悬赏园豆：30
[已解决问题]
解决于 2019-03-24 14:58
运行一个 asp.net core 2.2 项目时 ef core 报错：
System.InvalidOperationException: Nullable object must have a value.
at lambda_method(Closure , QueryContext , TransparentIdentifier`2 )
at Microsoft.EntityFrameworkCore.Query.ExpressionVisitors.Internal.ProjectionShaper.TypedProjectionShaper`3.Shape(QueryContext queryContext, ValueBuffer& valueBuffer)
at Microsoft.EntityFrameworkCore.Query.Internal.AsyncQueryingEnumerable`1.AsyncEnumerator.MoveNext(CancellationToken cancellationToken)
at Microsoft.EntityFrameworkCore.Query.Internal.AsyncLinqOperatorProvider.ExceptionInterceptor`1.EnumeratorExceptionInterceptor.MoveNext(CancellationToken cancellationToken)
at System.Linq.AsyncEnumerable.Aggregate_[TSource,TAccumulate,TResult](IAsyncEnumerable`1 source, TAccumulate seed, Func`3 accumulator, Func`2 resultSelector, CancellationToken cancellationToken) in D:\a\1\s\Ix.NET\Source\System.Interactive.Async\Aggregate.cs:line 120请问如何解决？
最佳答案
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有个实体属性定义为 int 类型，但数据库查询结果中出现了 NULL 值，将类型改为 int? 解决了
其他回答(1)
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感谢提示@dudu
