1.查看当前版本

dotnet --version

C:\Users\18749>dotnet --version
7.0.306

2.查看所有版本信息

dotnet --info

C:\Users\18749>dotnet --info
.NET SDK:
 Version:   7.0.306
 Commit:    f500069cb7

运行时环境:
 OS Name:     Windows
 OS Version:  10.0.22621
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\7.0.306\

Host:
  Version:      7.0.9
  Architecture: x64
  Commit:       8e9a17b221

.NET SDKs installed:
  6.0.412 [C:\Program Files\dotnet\sdk]
  7.0.306 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.All 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.20 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 7.0.9 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.20 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 7.0.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 6.0.20 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 7.0.9 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

Other architectures found:
  x86   [C:\Program Files (x86)\dotnet]
    registered at [HKLM\SOFTWARE\dotnet\Setup\InstalledVersions\x86\InstallLocation]

Environment variables:
  Not set

global.json file:
  Not found

Learn more:
  https://aka.ms/dotnet/info

Download .NET:
  https://aka.ms/dotnet/download

我们看到安装了两个版本，因此可以切换

.NET SDKs installed:
6.0.412 [C:\Program Files\dotnet\sdk]
7.0.306 [C:\Program Files\dotnet\sdk]

3.版本切换

dotnet new globaljson --sdk-version 版本号 --force

C:\Users\18749>dotnet new globaljson --sdk-version 6.0.412 --force
已成功创建模板“global.json file”。


C:\Users\18749>dotnet --version
6.0.412

现在就切换好了！