发布：2023/12/7 15:29:11作者：大数据 来源：大数据 浏览次数：442
_dbcontext.Update(q);
_dbcontext.SaveChanges();
当保存数据时提示错误，原因是没有获取到主键id值
Database operation expected to affect 1 row(s) but actually affected 0 row(s). Data may have been modified or deleted since entities were loaded
asp.net 更新数据时报错：Database operation expected to affect 1 row(s) but actually affected 0 row(s). Data may have been modified or deleted since entities were loaded
原因：Check your object, does it pass Primary Key Null. This Exception is Generally due this reason only.
对象的主键为空，导致不能更新，检查你要更新的对象，查看主键是否为空，或0
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