如何比较Linq中的十进制DBNull？

Question

someDS.someDT.Where(x => x.Amount is not DBNull)
             .Sum(x => x.Amount);

根据链接How to compare DBNull value，上述代码应该没问题，还是有其他办法来处理上述情况？

Answer 1

如果您的Amount是可空的decimal，那么您可以将null可空decimal类型的值视为

someDS.someDT.Where(x => x.Amount.HasValue == true)
             .Sum(x => x.Amount);

Answer 2

  someDS.someDT.Where(x => x.Amount != DBNull.Value)
         .Sum(x => x.Amount);