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It is possible for a column that is nominally of the domain type to read as null despite there being such a constraint. For example, this can happen in an outer-join query, if the domain column is on ...

A guide on the different developer practices, language features, libraries, and patterns that you can use to prevent NullPointerExceptions.

For backward compatibility, more than one positional argument can be given. In that case, the string representation of the tuple of positional arguments becomes the message reported to the client.

看到这里，其实答案也就写在脸上了，c# 中的属性，本质上是使用get、set方法，包了一层私有字段。私有字段会叫一个特殊名字<xxxx>k__BackingField，低级别的c#语法是允许命名加特殊字符的，就是防止重名，因为你不能取这样的名称 ...