关于System.InvalidOperationException:“Nullable object must have a value.异常
关于System.InvalidOperationException:“Nullable object must have a value.异常 这个问题是在今天早上遇到了，纠结了很久，反复检查了数据库的设计以及EF中的实体模型是否准确，最后终于找出了解决方案。 首先出现这个问题的原因在于你所要获取的那个对象的某个可以为null的字段被赋值为null。 如上图的People实体中的Id这个字段是可
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相关文章
- 1. java.sql.SQLException: Field 'id' doesn't have a default value异常
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- 5. KEIL编译报错 error: #268:expression must have a constant value
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