原文:System.Data.SqlTypes.SqlNullValueException: 'Data is Null. This method or property cannot be called on Null values.'

If you are trying to read some nullable data from the database, but your type is not nullable you can get this error. IfMyIntis nullable in the database and you have this entity: public class MyEntit ...

2021-08-20 15:20 0 99 推荐指数:

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Value cannot be null. Parameter name: source

下图主要想说.net抛错后的优先级, 错误1是根本原因,排第一位; 错误2里的方法包含了错误1,排第二位; 错误3就是整个Action了。 类似这样的错误,按照这样的顺序来解决bug,相信很受 ...

Tue Mar 11 23:19:00 CST 2014 0 2875
 
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