For more information about dotnet new templates see here.

Run from a command line:

dotnet new install Avalonia.Templates

The templates should now be available in dotnet new list:

Template Name                        Short Name                 Language  Tags
-----------------------------------  -------------------------  --------  -----------------------------------------
Avalonia .NET Core App               avalonia.app               [C#],F#   Desktop/Xaml/Avalonia/Windows/Linux/macOS
Avalonia .NET Core MVVM App          avalonia.mvvm              [C#],F#   Desktop/Xaml/Avalonia/Windows/Linux/macOS
Avalonia Cross Platform Application  avalonia.xplat             [C#],F#   Desktop/Xaml/Avalonia/Web/Mobile
Avalonia Resource Dictionary         avalonia.resource                    Desktop/Xaml/Avalonia/Windows/Linux/macOS
Avalonia Styles                      avalonia.styles                      Desktop/Xaml/Avalonia/Windows/Linux/macOS
Avalonia TemplatedControl            avalonia.templatedcontrol  [C#]      Desktop/Xaml/Avalonia/Windows/Linux/macOS
Avalonia UserControl                 avalonia.usercontrol       [C#],F#   Desktop/Xaml/Avalonia/Windows/Linux/macOS
Avalonia Window                      avalonia.window            [C#],F#   Desktop/Xaml/Avalonia/Windows/Linux/macOS

Note:

By default dotnet CLI would create a C# template,if you want to create F# template you will need to add -lang F# to the end of the command.

To create a new barebones application called MyApp in its own subdirectory, run:

dotnet new avalonia.app -o MyApp

Available parameters:

-A, --AvaloniaVersion

Description: The target version of Avalonia NuGet packages.

Options: 0.10.18, 11.0.0-preview4

By default: 0.10.18

MVVM is the recommended pattern for creating Avalonia applications. The MVVM application template uses ReactiveUI to ease building applications with complex interactions.

To create a new MVVM application called MyApp in its own subdirectory, run:

dotnet new avalonia.mvvm -o MyApp

Available parameters:

-A, --AvaloniaVersion

Description: The target version of Avalonia NuGet packages.

Options: 0.10.18, 11.0.0-preview4

By default: 0.10.18

-M, --MVVMToolkit

Description: MVVM toolkit to use in the template.

Options: ReactiveUI, CommunityToolkit

By default: ReactiveUI

To create a new Cross-Platform application in its own subdirectory, run:

dotnet new avalonia.xplat 

Note: This type of template allows you to create an application that will work on Desktop, Browser (preview) and Mobile (iOS & Android) (preview).

To create a new Window called MyNewWindow, in the namespace MyApp run:

dotnet new avalonia.window -na MyApp -n MyNewWindow

To create a new UserControl called MyNewView, in the namespace MyApp run:

dotnet new avalonia.usercontrol -na MyApp -n MyNewView

To create a new Styles list called MyStyles, run:

dotnet new avalonia.styles -n MyStyles

To create a new ResourceDictionary called MyResources, run:

dotnet new avalonia.resource -n MyResources