MSDN详细介绍了如何从注册表中检查它:

To find .NET Framework versions by viewing the registry (.NET Framework 1-4) On the Start menu, choose Run. In the Open box, enter regedit.exe.You must have administrative credentials to run regedit.exe. In the Registry Editor, open the following subkey: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP The installed versions are listed under the NDP subkey. The version number is stored in the Version entry. For the .NET Framework 4 the Version entry is under the Client or Full subkey (under NDP), or under both subkeys. To find .NET Framework versions by viewing the registry (.NET Framework 4.5 and later) On the Start menu, choose Run. In the Open box, enter regedit.exe. You must have administrative credentials to run regedit.exe. In the Registry Editor, open the following subkey: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full Note that the path to the Full subkey includes the subkey Net Framework rather than .NET Framework Check for a DWORD value named Release. The existence of the Release DWORD indicates that the .NET Framework 4.5 or newer has been installed on that computer.

注意:上面快照中被剪切的最后一行在所有其他操作系统版本上为:461310。我尽我最大的努力避免在截屏时信息被剪切，但表格太大了。

在CMD下执行以下命令:

dotnet——list-sdks

它将显示所有已安装的。net版本，如上图所示。你也可以运行下面的命令来查看正在使用的。net版本:

dotnet——版本

微软的powershell:

Get-ChildItem "hklm:SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full\" | Get-ItemPropertyValue -Name Release | % { $_ -ge 394802 }

请参阅此链接的表格，以获取用于搜索特定版本的DWORD值:

https://learn.microsoft.com/en-us/dotnet/framework/migration-guide/how-to-determine-which-versions-are-installed#ps_a

适用于运行Windows 10 1607并寻找。net 4.7的用户。 忽略以上所有。

不在注册表中，c:\ windows \微软NET文件夹或“已安装程序”列表或同一列表的WMIC显示。

查找“已安装的更新”KB3186568。

如果打开命令提示符并键入以下两个命令，将列出当前机器上安装的所有框架版本(每个版本都存储在该目录中的单独目录中)。

cd %systemroot%\Microsoft.NET\Framework

dir /A:D

我的天，找到安装的。net框架的版本有这么多麻烦?

Windows >搜索> Visual Studio Installer >为已安装的VS版本，点击更多>修改>单个组件，并在那里看到它: