你好 Yiyi Zhu,
全选后当然可以使用C#。当你安装VS Community 2015时候,选择默认安装选项及可默认安装C#,VB,WEB
和桌面应用程序开发功能。

如果选择自定义安装,下一步选择安装组件时,即使不选择任何组件也可以继续安装。安装完成后,VS依然支持C#的开发,结果如下图所示。

所以,在安装VS Community 2015
时,建议使用默认安装,如有特殊需要可再次运行安装程序添加不同的开发组件。
Best Regards,
Albert Zhang
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