Install project template

Jump into the folder which same location with sln file. use the following command to install

dotnet new --install ./

Uninstall project template

You can run anywhere with the following command

dotnet new --uninstall

After the command executed, console should display all the template that you have been installed. And also display uninstall command that you can use.

Install project template by nupkg file

Generator nupke file

follow the instruction from https://github.com/dotnet/templating/wiki/Runnable-Project-Templates

That says

The whole contents of the project folder, together with the .template.config\template.json file, needs to be placed into a folder named content.

Besides the content folder there needs to be a .nuspec file created. A packageTypes\packageType element with the value Template should be present in that file.
Both the content folder and the .nuspec file should reside in the same file system location.

so, we create a new .nuspec first. After created, it would be look like this

<?xml version="1.0" encoding="utf-8"?>
<package >
  <metadata>
    <id>pako.template.webapi</id>
    <version>1.0.0</version>
    <authors>victor</authors>
    <owners>victor</owners>
    <requireLicenseAcceptance>false</requireLicenseAcceptance>
    <license type="expression">MIT</license>
    <description>some description here</description>
    <releaseNotes>init release.</releaseNotes>
    <copyright>Copyright 2022</copyright>
    <tags>template</tags>
    <packageTypes>
      <packageType name="template" />
    </packageTypes>
  </metadata>
</package>

Tips: you can run the following command to generator a default .nuspec file

nuget spec

Put the packageTypes tag in .nuspec is very important. That means the package is a project type package.

Finally, we can generator nupakg file by excute the following command

nuget pack

install project template by nupkg file

dotnet new --install PATH_OF_NUPKG

uninstall command

dotnet new --uninstall