在Windows 8/10中，默认安装.NET Framework 4.5 。由于 .NET 4.5 是 4.0 的就地升级，您可以自动运行适用于.NET Framework 4.5或 4.0 的任何应用程序。这很好，但是如果您需要运行需要旧版本.NET Framework的程序怎么办？您可以运行的最低版本是多少？

在Windows 8/10中，.NET 3.5、3.0 和 2.5 随操作系统一起提供，您只需启用它即可。这非常好，因为您不必从Microsoft网站下载 .NET 3.5。在这篇文章中，我将向您展示如何在Windows 8/10.NET Framework。

在Windows 8中，首先转到“开始”屏幕^{(Start Screen)}并开始输入“Turn Windows...”，然后单击Charms栏中的“设置” 。^(Settings)您应该会看到一个名为Turn Windows Features On or Off的选项。

在Windows 10中，只需单击开始^(Start)并依次键入 windows features^{(turn windows features)}并按 Enter。

桌面上会弹出一个对话框，第一个选项是.NET Framework 3.5（包括 .NET 2.0 和 3.0）^{(.NET Framework 3.5 (includes .NET 2.0 and 3.0))}。只需^(Just)继续并选中该框，即可安装这些功能，而无需从Internet下载任何内容。

唯一不随Windows 8/10Framework^{(.NET Framework)}版本是.NET Framework 1.1。如果你想安装它，你必须从这里下载它：

https://www.microsoft.com/en-us/download/details.aspx?id=26

.NET Framework 1.1确实安装在Windows 8/10上，因此您可以运行为该版本的框架编写的应用程序。安装它时可能会收到兼容性警告，但仅此而已。否则，它应该可以安装并正常工作。

另外，请注意，Windows 8/10 是智能的，如果您要安装需要.NET Framework 3.5的应用程序，它会弹出一个消息框询问您是否要安装该功能，这与我们在上面手动执行的操作相同.

对于那些想要在Windows Server 2012上安装^{(Windows Server 2012)}.NET Framework的 IT 人员，您可以这样做。

1. 转到服务器管理器，单击管理^(Manage)，然后单击添加角色和功能^{(Add Roles and Features)}。然后单击下一步。

2. 您将看到选择安装类型^{(Select installation type)}屏幕，并且您要选择基于角色或基于功能的安装^{(Role-based or feature-based installation)}，然后单击下一步。

3. 现在在选择目标服务器^{(Select destination server)}屏幕上，选择您的目标服务器并单击下一步^(Next)。

4. 您将看到选择服务器角色^{(Select server roles )}屏幕，您必须再次单击下一步^(Next)。

5. 最后，在Select features 屏幕上，您可以选中^(Select).NET Framework 3.5 Features复选框。

哇！这是一个漫长的过程，但这就是您在Windows Server 2012上执行此操作的方式。另外需要注意的是，如果您将 Windows 7 或Windows Server 2008 R2 升级到 Windows 8/10 或Windows Server 2012，.NET Framework 3.5会自动启用。就是这样。享受！

Install .NET Framework 3.5, 3.0, 2.0 on Windows 8/10

Wіth Windows 8/10, .NET Framework 4.5 comes installed by default. Since .NET 4.5 iѕ an in-place upgrade of 4.0, you can automatically run any applications that are gearеd towards .NET Framework 4.5 or 4.0. That’s fine, but what if you need to run programs that require older versions of .NET Framework? What’s the lowest version you cаn run?

In Windows 8/10, .NET 3.5, 3.0 and 2.5 come with the OS, you just have to enable it. This is really nice because you don’t have to go and download .NET 3.5 from the Microsoft website. In this post, I’ll show you how to enable the older versions of the .NET Framework in Windows 8/10.

In Windows 8, first go to the Start Screen and start typing “Turn Windows…” and click on Settings in the Charms bar. You should see an option called Turn Windows Features On or Off.

In Windows 10, just click on Start and type in turn windows features and press Enter.

A dialog box will pop up on the desktop and the first option will be .NET Framework 3.5 (includes .NET 2.0 and 3.0). Just go ahead and check that box and that will install those features without needing to download anything from the Internet.

The only version of .NET Framework that does not come with Windows 8/10 is .NET Framework 1.1. If you want to install that, you’ll have to download it from here:

https://www.microsoft.com/en-us/download/details.aspx?id=26

.NET Framework 1.1 does install on Windows 8/10, so you can run applications written for that version of the framework. You might get a compatibility warning when you install it, but that’s about it. Otherwise, it should install and work fine.

Also, note that Windows 8/10 is smart and if you go to install an application that needs .NET Framework 3.5, it will pop up a message box asking if you want to install that feature, which is the same thing we did manually above.

For those IT folks who want to install .NET Framework on Windows Server 2012, here’s how you do it.

1. Go to Server Manager, click Manage and then click on Add Roles and Features. Then click Next.

2. You’ll see the Select installation type screen and you want to select Role-based or feature-based installation and click Next.

3. Now on the Select destination server screen, choose your target server and click Next.

4. You’ll see the Select server roles screen and you have to click Next again.

5. Finally, on the Select features screen, you can check the box for .NET Framework 3.5 Features.

Whew! That’s a long process, but that’s how you do it on Windows Server 2012. Another thing to note is that if you upgrade Windows 7 or Windows Server 2008 R2 to Windows 8/10 or Windows Server 2012, .NET Framework 3.5 is enabled automatically. That’s about it. Enjoy!

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