type or namespace name could not be found c#

c#中5种访问修饰符中剩下的3中访问修饰符主要是正对着"继承"这个语言

【c#入门详解6】-操作符 - 知乎

命名空间(namespace):c#中用于为功能分类的对象,相当于我们用硬盘

c#代码内存查看工具

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