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Windows Server 2012 R2安装.net3.5

开始菜单 -> 服务器管理器
![](https://img2020.cnblogs.com/blog/1208477/202007/1208477-20200710201722828-1531379011.png)

管理 -> 添加角色和功能
![](https://img2020.cnblogs.com/blog/1208477/202007/1208477-20200710201907832-1128209201.png)

选择安装类型,默认选择(基于角色或基于功能的安装)

![](https://img2020.cnblogs.com/blog/1208477/202007/1208477-20200710202049662-51320526.png)

服务器选择,选择当前服务器
![](https://img2020.cnblogs.com/blog/1208477/202007/1208477-20200710202134642-592152056.png)

选择服务器角色,把Web服务器(IIS)下用的着的功能全部勾选上就可以了。
![](https://img2020.cnblogs.com/blog/1208477/202007/1208477-20200710202801112-1133668545.png)

功能选择,这里将.net Framework 3.5功能勾选上
![](https://img2020.cnblogs.com/blog/1208477/202007/1208477-20200710202858769-1859866514.png)

确认选择的服务后,点击安装即可
![](https://img2020.cnblogs.com/blog/1208477/202007/1208477-20200710203017079-55848425.png)

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