Message in Chinese (Simplified) (中文(简体))
成员“<var>Member</var>”的 DeleteOnNull 规范无效。对于映射到不可为 null 的外键列的单一实例关联成员,DeleteOnNull 只能为 true。
Unlocalized message
Invalid DeleteOnNull specification for member '<var>Member</var>'. DeleteOnNull can only be true for singleton association members mapped to non-nullable foreign key columns.
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