c# - Switch between dotnet core SDK versions

Question

I recently installed VS 2017 RC and then automatically my dotnet version pointed to 1.0.0-preview4-004233. Due to that whenever I create a new project using command dotnet new -t Console I cannot see project.json though I see .csproj file.

When I check dotnet versions available on my machine at - C:Program Filesdotnetsdk I see multiple versions available.

Is there any way to switch dotnet core back to an earlier version - 1.0.0-preview2-003133 from 1.0.0-preview4-004233 without uninstalling.

Answer 1

You can do this with a global.json file in the root of your project:

• Verify the list of SDKs on your machine:

dotnet --list-sdks

You'll see a list like this.

2.1.100 [C:Program Filesdotnetsdk]
2.1.101 [C:Program Filesdotnetsdk]
2.1.103 [C:Program Filesdotnetsdk]
2.1.104 [C:Program Filesdotnetsdk]
[...lines omitted...]
2.1.601 [C:Program Filesdotnetsdk]
2.2.101 [C:Program Filesdotnetsdk]
3.0.100-preview3-010431 [C:Program Filesdotnetsdk]

• Create a folder to be the root of your project, where you are going to run dotnet new.
• In that folder, run this command: dotnet new globaljson

The result will look something like this:

{
  "sdk": {
    "version": "3.0.100-preview3-010431"
  }
}

• In version, replace the 3.0.100-preview3-010431 with the version you prefer from the --list-sdks list. For example:

{
  "sdk": {
    "version": "2.2.101"
  }
}

• Run dotnet --version to verify. You should see:

2.2.101

• Run the appropriate dotnet new commands to create your project.