key Specifies an attribute or element value as a key (unique, non-nullable, and always present) within the containing element in an instance document
基于1个网页-相关网页
Other features include class invariants, non-nullable reference types, and enhanced static analysis capabilities.
其他的特性还包括类不变量、非空引用类型和加强的静态分析功能。
In the lower right part of the section, set all key columns of the output link to non-nullable by selecting no in the nullable column.
在本部分的右下侧，通过选择空列上的no可将所有输出链接的关键列都设置为非空。
If the return type is non-nullable, the default CLR value for the type is returned.
如果返回类型可以为非空型，则返回类型的默认clr值。
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