A project with an Output type of Class Library cannot be started directly

一朋友发过来一个asp.net项目的代码,尝试在VS2017中运行,无法启动,提示: A project with an Output type of Class Library cannot be started directly 网上查到了解决办法: 在解决方案浏览器中,选中web项目,右击,选中“Set as StartUp Project", 然后VS顶部出现IIS选项,点击它,运行成功:
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