如何检查是否已安装 .NET
本文介绍如何检查计算机上安装的 .NET 运行时和 SDK 的版本。 如果拥有集成开发环境（如 Visual Studio），则可能已安装 .NET。
安装 SDK 便会安装相应的运行时。
如果本文中的任何命令失败，则未安装运行时或 SDK。 有关详细信息，请参阅 Windows、macOS 或 Linux 的安装文章。
检查 SDK 版本
可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
将获得类似于下面的输出。
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
可使用以下命令查看当前安装的 .NET 运行时版本。
dotnet --list-runtimes
将获得类似于下面的输出。
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
可以安装 .NET，但不能将其添加到操作系统或用户配置文件的 PATH 变量。 在这种情况下，前面几节中的命令可能不起作用。 作为替代方法，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中。 大多数时候，安装 .NET 时使用的安装程序或脚本会让你选择安装到另一个文件夹。 如果选择安装到其他文件夹，请调整文件夹路径的开头。
dotnet executable
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 executable
/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 executable
/usr/local/share/dotnet/dotnet.NET SDK
/usr/local/share/dotnet/sdk/{version}/.NET Runtime
/usr/local/share/dotnet/shared/{runtime-type}/{version}/
详细信息
可通过命令 dotnet --info 查看 SDK 版本和运行时版本。 你还将获得其他环境相关信息，如操作系统版本和运行时标识符 (RID)。
