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Workaround to use the Blazor templates with the .NET CLI
There is currently a little bug with the templating in the DotNet command line interface, so you may see the Blazor templates only once after installing them.

If you encounter the problem, a quick and very simple workaround is to run the command dotnet new --debug:reinit and reinstall the Blazor templates. After doing this, you will see the Blazor templates back in the list.
dotnet new --debug:reinit
dotnet new -i Microsoft.AspNetCore.Blazor.Templates::0.0.5-* --nuget-source https://dotnet.myget.org/F/blazor-dev/api/v3/index.json

dotnet new --list

March 06, 2018