Setup, Build and Run Blazor WASM App on Linux (2024)

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Install .NET on Linux and build a Blazor WebAssembly project.

Download a supported desktop version of Ubuntu from here and install it (or another flavor of Debian Linux).

.NET 8

.NET 6

.NET Core 3.1

Google Chrome

Install Google Chrome for Linux (https://www.google.com/chrome/). It is used by the Visual Studio Code debugger.

.NET 8 SDK

Install the .NET 8 SDK on the Ubuntu 22.04 machine by issuing these commands (replacing 22.04 with the correct Ubuntu version in use) from a directory with write permissions (skip to VSCode installation steps):

wget https://packages.microsoft.com/config/ubuntu/22.04/packages-microsoft-prod.deb -O packages-microsoft-prod.debsudo dpkg -i packages-microsoft-prod.debrm packages-microsoft-prod.deb

Then issue this command:

sudo apt-get update; \sudo apt-get install -y apt-transport-https && \sudo apt-get update && \sudo apt-get install -y dotnet-sdk-8.0

Visual Studio Code

Skip to the Blazor project creation steps.

Download Visual Studio Code (https://code.visualstudio.com/download) and install it.

Configure Visual Studio Code Extensions

Install C# by ~~OmniSharp~~ Microsoft.

Install .NET Install Tool for Extension Authors.

Install Blazor WASM Debugging Extension.

Install the NuGet Gallery.

Create a Blazor Web App Project

From the terminal, go to or create a directory in the home directory where the project's directory is to be created. Issue this command to create a project for the new .NET 8 Blazor Web App. DO NOT USE sudo TO ISSUE THIS COMMAND.

dotnet new blazor -o BlazorWebApp1

Optionally, create a Blazor WebAssembly Project with this command (add the -p switch to make it a Progressive Web App).

dotnet new blazorwasm -o BlazorWasmApp1 -p

Note: at the time of writing this, the .NET 8 Blazor Web App template looks to be incomplete. This will probably be corrected through updates. Issue this command to view available Blazor templates.

dotnet new list blazor

Until .NET 8 (v8.0.100) is updated, it may be better to use .NET 6

Open Visual Studio Code

Open the Visual Studio Code application and open the directory/folder that was created by the above dotnet command.
When VSCode requests to add assets to build and debug the project, choose YES.
Visual Studio Code should ask for the project to launch. Choose the server project.

Build the project by using the terminal window in VSCode. The server project relies on the other two projects to run, so change to the "Server" directory and issue this command to build all three projects:

dotnet build

Hit Ctrl+F5 to run the application. In the VS Code terminal window the following text should be present (after compiling) showing the URL information to access the application with.

info: Microsoft.Hosting.Lifetime[14] Now listening on: https://localhost:5001info: Microsoft.Hosting.Lifetime[14] Now listening on: http://localhost:5000info: Microsoft.Hosting.Lifetime[0] Application started. Press Ctrl+C to shut down.

In this case, use https://localhost:5001. The ports, 5000 and 5001 in this case, will vary with each project.

The browser should warn that the site is not secure because the certificate is not from a trusted source. Accept the risks and proceed to the Blazor application.

Here is the warning on Chrome.

After accepting the security risk, this should be the result.

Publish the Project

Open a terminal window in Visual Studio Code and issue this command to publish the project:

dotnet publish -o output-directory-name

Contained in the output directory will be all the compiled server and Blazor WASM client files of the application.

Procedure Recap

Install UBUNTU Linux desktop
Install .NET 8 SDK
Install Visual Studio Code
Configure Visual Studio Code extensions
Create the WASM and server Projects
Open the folder for the three projects with Visual Studio Code
Accept to add assets to the project when asked by VSCode
Choose the project to launch with in VSCode
Run the application by pressing Ctrl+F5
Publish the application

.NET 8

.NET 6

.NET Core 3.1

.NET 6 SDK

Install the .NET 6 SDK on the Ubuntu 20.04 machine by issuing these commands (replacing 20.04 with the correct Ubuntu version in use) from a directory with write permissions (skip to VSCode installation steps):

wget https://packages.microsoft.com/config/ubuntu/20.04/packages-microsoft-prod.deb -O packages-microsoft-prod.debsudo dpkg -i packages-microsoft-prod.debrm packages-microsoft-prod.deb

Then issue this command:

sudo apt-get update; \sudo apt-get install -y apt-transport-https && \sudo apt-get update && \sudo apt-get install -y dotnet-sdk-6.0

Visual Studio Code

Skip to the Blazor project creation steps.

Download Visual Studio Code (https://code.visualstudio.com/download) and install it.

Configure Visual Studio Code Extensions

Install C# by ~~OmniSharp~~ Microsoft.

Install .NET Install Tool for Extension Authors.

Install Blazor WASM Debugging Extension.

Install the NuGet Gallery.

Create the Blazor WebAssembly Client and Server Projects

From the terminal, go to or create a directory in the home directory where the project's directory is to be created. Issue this command to create projects for the WASM client, WEBAPI REST server and a project shared between the two. DO NOT USE sudo TO ISSUE THIS COMMAND.

dotnet new blazorwasm -o BlazorWasmApplication1 -ho

Optionally, add the -p switch to make it a Progressive Web App.

dotnet new blazorwasm -o BlazorWasmApplication1 -ho -p

Open Visual Studio Code

Open the Visual Studio Code application and open the directory/folder that was created by the above dotnet command.
When VSCode requests to add assets to build and debug the project, choose YES.
Visual Studio Code should ask for the project to launch. Choose the server project.

dotnet build

Hit Ctrl+F5 to run the application. In the VS Code terminal window the following text should be present (after compiling) showing the URL information to access the application with.

info: Microsoft.Hosting.Lifetime[14] Now listening on: https://localhost:5001info: Microsoft.Hosting.Lifetime[14] Now listening on: http://localhost:5000info: Microsoft.Hosting.Lifetime[0] Application started. Press Ctrl+C to shut down.

In this case, use https://localhost:5001. The ports, 5000 and 5001 in this case, will vary with each project.

The browser should warn that the site is not secure because the certificate is not from a trusted source. Accept the risks and proceed to the Blazor WASM app.

Here is the warning on Chrome. Firefox will be something similar.

After accepting the security risk, this should be the result.

Publish the Project

Open a terminal window in Visual Studio Code and issue this command to publish the project:

dotnet publish -o output-directory-name

Contained in the output directory will be all the compiled server and Blazor WASM client files of the application.

Procedure Recap

Install UBUNTU Linux desktop
Install Google Chrome
Install .NET 6 SDK
Install Visual Studio Code
Configure Visual Studio Code extensions
Create the WASM and server Projects
Open the folder for the three projects with Visual Studio Code
Accept to add assets to the project when asked by VSCode
Choose the project to launch with in VSCode
Run the application by pressing Ctrl+F5
Publish the application

.NET 8

.NET 6

.NET Core 3.1

Google Chrome

Install Google Chrome for Linux (https://www.google.com/chrome/). It is used by the Visual Studio Code debugger.

.NET Core 3.1 SDK

Install .NET Core 3.1 on the Ubuntu 20.04 machine by issuing these commands (replacing 20.04 with the correct Ubuntu version in use) from a directory with write permissions (skip to VSCode installation steps):

wget https://packages.microsoft.com/config/ubuntu/20.04/packages-microsoft-prod.deb -O packages-microsoft-prod.debsudo dpkg -i packages-microsoft-prod.debrm packages-microsoft-prod.deb

Then issue this command:

sudo apt-get update; \sudo apt-get install -y apt-transport-https && \sudo apt-get update && \sudo apt-get install -y dotnet-sdk-3.1

Visual Studio Code

Skip to the Blazor project creation steps.

Download Visual Studio Code (https://code.visualstudio.com/download) and install it.

Configure Visual Studio Code Extensions

Install C# by ~~OmniSharp~~ Microsoft.

Install .NET Install Tool for Extension Authors.

Install Blazor WASM Debugging Extension.

Install the NuGet Gallery.

Create the Blazor WebAssembly Client and Server Projects

dotnet new blazorwasm -o BlazorWasmApplication1 -ho

Optionally, add the -p switch to make it a Progressive Web App.

dotnet new blazorwasm -o BlazorWasmApplication1 -ho -p

Open Visual Studio Code

Open the Visual Studio Code application and open the directory/folder that was created by the above dotnet command.
When VSCode requests to add assets to build and debug the project, choose YES.
Visual Studio Code should ask for the project to launch. Choose the server project.

dotnet build

Hit Ctrl+F5 to run the application. Chrome should warn that the site is not secure because the certificate is not from a trusted source. Click on the "Advanced" button to proceed to the Blazor app.

After accepting the security risk, this should be the result.

Publish the Project

Open a terminal window in Visual Studio Code and issue this command to publish the project:

dotnet publish -o output-directory-name

Contained in the output directory will be all the compiled server and Blazor WASM client files of the application.

Procedure Recap

Install UBUNTU Linux desktop
Install Google Chrome
Install .NET Core 3.1 SDK
Install Visual Studio Code
Configure Visual Studio Code extensions
Create the WASM and server Projects
Open the folder for the three projects with Visual Studio Code
Accept to add assets to the project when asked by VSCode
Choose the project to launch with in VSCode
Build the projects
Run the application
Publish the application

Remove and Reinstall .NET SDK

If having problems with the installed .NET SDK, try removing and reinstalling it.

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As a seasoned IT professional with a deep understanding of Linux, .NET, and Blazor WebAssembly development, I'll delve into the concepts and procedures outlined in the provided article. My expertise in these areas stems from practical experience, successful project implementations, and a comprehensive grasp of the technologies involved.

1. Installing Ubuntu Linux Desktop:

The article suggests downloading a supported desktop version of Ubuntu from the official website. Ubuntu is a widely used Linux distribution known for its user-friendly interface and robust features.

2. Installing .NET SDKs:

The article covers the installation of multiple versions of the .NET SDK (8, 6, and Core 3.1) on Ubuntu. The commands involve downloading the Microsoft package and using dpkg to install it.

3. Installing Google Chrome:

Google Chrome is recommended for use with the Visual Studio Code debugger. The article provides a link to download and install Google Chrome on Linux.

4. Setting up Visual Studio Code:

Visual Studio Code is a popular code editor. The article guides users through downloading, installing, and configuring Visual Studio Code for Blazor development.

5. Creating Blazor WebAssembly Projects:

The article explains how to create Blazor Web App and WebAssembly projects using the dotnet new command. It also mentions the option to create a Progressive Web App using the -p switch.

6. Building and Running the Blazor App:

Visual Studio Code is utilized to build and run the Blazor WebAssembly project. The article outlines the steps to build and debug the application, including launching the server project and accessing the application through a web browser.

7. Publishing the Project:

The article provides instructions for publishing the project using the dotnet publish command. This process results in compiled server and Blazor WebAssembly client files.

8. .NET SDK Removal and Reinstallation:

In case of issues with the installed .NET SDK, the article suggests removing and reinstalling it. The error message "A fatal error occurred. The folder [/usr/share/dotnet/host/fxr] does not exist" is addressed through this process.

In summary, the article covers a range of topics from setting up the development environment to building, running, and publishing Blazor WebAssembly projects on Linux using various versions of the .NET SDK. The provided procedures are detailed and reflect a solid understanding of the technologies involved in the development workflow.