摘要: 表A中有一列StorageByte(int, not null),求和 A.Where(a => a.JobId ==@jodid).Select(c=>c.StorageByte).Sum()
如果这个@jodid不存在,程序会报InvalidOperationException:The null value cannot be assigned to a member with type System.Int32 which is a non-nullable value type.
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posted @ 2010-04-21 10:08 VelvetMark 阅读(520) 评论(0)
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