本文介绍如何检查计算机上安装了哪些版本的 .NET 运行时和 SDK。 如果已安装集成开发环境（如 Visual Studio），则可能已安装 .NET。
安装 SDK 会安装相应的运行时。
如果本文中的任何命令失败，则说明没有安装运行时或 SDK。 有关详细信息，请参阅 适用于 Windows、 macOS 或 Linux 的安装文章。
检查 SDK 版本
您可以使用终端查看当前安装的 .NET SDK 版本。 打开终端并运行以下命令。
dotnet --list-sdks
你将获得类似于以下内容的输出。
3.1.424 [C:\program files\dotnet\sdk]
5.0.100 [C:\program files\dotnet\sdk]
6.0.402 [C:\program files\dotnet\sdk]
7.0.404 [C:\program files\dotnet\sdk]
8.0.100 [C:\program files\dotnet\sdk]
3.1.424 [/home/user/dotnet/sdk]
5.0.100 [/home/user/dotnet/sdk]
6.0.402 [/home/user/dotnet/sdk]
7.0.404 [/home/user/dotnet/sdk]
8.0.100 [/home/user/dotnet/sdk]
3.1.424 [/usr/local/share/dotnet/sdk]
5.0.100 [/usr/local/share/dotnet/sdk]
6.0.402 [/usr/local/share/dotnet/sdk]
7.0.404 [/usr/local/share/dotnet/sdk]
8.0.100 [/usr/local/share/dotnet/sdk]
检查运行时版本
可以使用以下命令查看当前安装了哪些版本的 .NET 运行时。
dotnet --list-runtimes
你将获得类似于以下内容的输出。
Microsoft.AspNetCore.App 3.1.30 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.10 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 7.0.5 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 8.0.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 3.1.30 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 5.0.17 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.10 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 7.0.5 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 8.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 3.1.30 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 6.0.10 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 7.0.5 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 8.0.0 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.AspNetCore.All 2.1.7 [/usr/lib/dotnet/shared/Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.1.13 [/usr/lib/dotnet/shared/Microsoft.AspNetCore.All]
Microsoft.AspNetCore.App 2.1.7 [/usr/lib/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.1.13 [/usr/lib/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 3.1.0 [/usr/lib/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 5.0.0 [/usr/lib/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.0 [/usr/lib/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 2.1.7 [/usr/lib/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 2.1.13 [/usr/lib/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 3.1.0 [/usr/lib/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 5.0.0 [/usr/lib/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.0 [/usr/lib/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 7.0.0 [/usr/lib/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 8.0.0 [/usr/lib/dotnet/shared/Microsoft.NETCore.App]
Microsoft.AspNetCore.All 2.1.7 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.1.13 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.All]
Microsoft.AspNetCore.App 2.1.7 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.1.13 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 3.1.0 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 5.0.0 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.0 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 2.1.7 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 2.1.13 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 3.1.0 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 5.0.0 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.0 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 7.0.0 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 8.0.0 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
检查安装文件夹
可能是 .NET 已安装，但未添加到操作系统或用户配置文件的 PATH 变量中。 在这种情况下，上一部分的命令可能无法正常工作。 或者，可以检查 .NET 安装文件夹是否存在。
从安装程序或脚本安装 .NET 时，会将其安装到标准文件夹。 很多时候，用于安装 .NET 的安装程序或脚本都提供了安装到其他文件夹的选项。 如果选择安装到其他文件夹，请调整文件夹路径的开头。
dotnet 可执行文件
C:\program files\dotnet\dotnet.exe.NET SDK
C：\program files\dotnet\sdk\{version}\.NET 运行时
C：\program files\dotnet\shared\{runtime-type}\{version}\
dotnet 可执行文件
/home/user/.dotnet/dotnet
/usr/lib/dotnet/dotnet
/usr/share/dotnet/dotnet\.NET SDK
/home/user/.dotnet/sdk/{version}/
/usr/lib/dotnet/sdk/{version}/
/usr/share/dotnet/sdk/{version}/\.NET 运行时
/home/user/.dotnet/shared/{runtime-type}/{version}/
/usr/lib/dotnet/shared/{runtime-type}/{version}/
/usr/share/dotnet/shared/{runtime-type}/{version}/\
dotnet 可执行文件
/usr/local/share/dotnet/dotnet.NET SDK
/usr/local/share/dotnet/sdk/{version}/.NET 运行时
/usr/local/share/dotnet/shared/{runtime-type}/{version}/
详细信息
可以使用命令 dotnet --info查看 SDK 版本和运行时版本。 你还将获取其他环境相关信息，例如作系统版本和运行时标识符（RID）。
