Win8 ( Server2012 ) 本地安装 .NET Framework 3.5
有时间有些程序需要.NET Framework 3.5，但是因为微软的下载服务器在国外，所以有时间如果要从网络上下载的话要很久很久，那么我们就只需要让系统本地安装就好了(此方法需要安装光盘或者镜像)
打开管理员的命令提示符(Win + X -> A)，然后输入以下命令即可，记得将红字换为你的路径哦
Dism /online /enable-feature /featurename:NetFx3 /All /Source:X:\sources\sxs /LimitAccess
稍候片刻，出现以下提示即安装成功：
Deployment Image Servicing and Management tool
Version: 6.2.8250.0
Image Version: 6.2.8250.0
Enabling feature(s)
[==========================100.0%==========================]
The operation completed successfully.
Version: 6.2.8250.0
Image Version: 6.2.8250.0
Enabling feature(s)
[==========================100.0%==========================]
The operation completed successfully.
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