C# 文件夹是否存在与新建

https://www.cnblogs.com/ljs-13/p/12424971.html
https://www.bbsmax.com/A/gVdnObpXzW/
https://blog.csdn.net/u014090257/article/details/102240995

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来源： https://www.cnblogs.com/Jane-share/p/16427563.html