Install .NET on Arch Linux

Upgrade the system:

sudo pacman -Syu

Install dependencies:

sudo pacman -Sy \
    glibc \
    gcc \
    krb5 \
    icu \
    openssl \
    libc++ \
    zlib

Download the installation script:

wget https://dot.net/v1/dotnet-install.sh -O dotnet-install.sh

Grant execute permission to the script:

chmod +x ./dotnet-install.sh

Run the script to install the latest version:

./dotnet-install.sh --version latest

Install the .NET Runtime:

./dotnet-install.sh --version latest --runtime aspnetcore

You can install a specific major version:

./dotnet-install.sh --channel 9.0

Set DOTNET_ROOT environment variable:

export DOTNET_ROOT=$HOME/.dotnet

Update the PATH environment variable:

export PATH=$PATH:$DOTNET_ROOT:$DOTNET_ROOT/tools

When running export, the changes will only be reflected for the current session. If you want the environment variables to always be loaded, you can use the bashrc file:

nano ~/.bashrc

The two exports must be added to the end of the file, then saved and exited. If you want to apply the changes immediately:

source ~/.bashrc

Check the installed version:

dotnet --version

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Install the GTK library (for GUI applications):

sudo pacman -S gtk3

Create a graphical ‘Hello, World!’ program

Create a new project:

dotnet new console -n HelloWorld
cd HelloWorld

Add the GtkSharp package to the project:

dotnet add package GtkSharp

Edit Program.cs with your favorite text editor:

using Gtk;

class Program
{
    public static void Main()
    {
        // Init GTK
        Application.Init();

        // Create main window
        Window window = new Window("HelloWorld");
        window.Resize(250, 150);

        // Create label
        Label label = new Label("Hello, World!");

        // Add label to window 
        window.Add(label);

        // Show components
        window.ShowAll();

        // Connect close event
        window.DeleteEvent += (o, e) => { Application.Quit(); };

        // Run application
        Application.Run();
    }
}

Compile and run the application:

dotnet build
dotnet run

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You can create a self-contained bundle of the application (for .NET 9.0 and Linux x64):

dotnet publish -c Release -r linux-x64 --self-contained
cd bin/Release/net9.0/linux-x64/publish
chmod +x HelloWorld
./HelloWorld

You can also use Visual Studio Code with the C# Dev Kit:

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