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Start writing a Blazor app in seconds
As of today, if you want to start writing a Blazor app in just few seconds, you can follow the official get started guide which requires mainly 3 points:
- Install the latest .NET Core SDK release
Install the latest(Not necessary anymore with SDK 3.1.300 or later)
Blazortemplate by running
dotnet new -i Microsoft.AspNetCore.Blazor.Templates::3.0.0-*
- Create a new
Blazor WebAssemblyproject by running:
dotnet new blazorwasm -o MyBlazorWebAssemblyProject,
- and finally
That’s all, you get a running
Blazor WebAssembly web app that you can start developping/debugging.
If you want to publish it, just run
dotnet publish -c release and copy the content of the
publish/dist folder to your favourite static files hosting platform, and you are done!
And if like me, you don’t like when too much magic is done for you, keep reading the following sections :)
Smallest publishable static Blazor project
To create the smallest client side
Blazor app possible, we will need first a
.csproj file at it is a C# project. Inside we will be able to reference the
Blazor specific tooling, as well as mandatory dependencies (3 exactly:
Then like any classic
ASP.NET core project, you will need a
Program.cs file which will be calling the
Startup.cs file. The latest will be in charge of referencing you root
Then for the real
Blazor stuff, you will need your root
Blazor component file, usually named
App.razor by convention, and also your default page usually called
Index.razor, placed inside a
To glue all of that stuff, you will also need to create an
index.html file inside the
wwwroot folder. In this file, you will find a reference to the
blazor.webassembly.js framework which will be in charge of loading the
mono webassembly runtime, as well as your project assemblies which need to be defined inside a
blazor.boot.json file (You can have a look at the schema described in What is Blazor).
You can find below a small recap list of the mentionned files:
- A C# project
- A entry
Startup.csfile following the startup pattern,
App.razorroot Blazor component,
Index.razorpage inside of a
Pagesfolder (by convention),
- And finally an
index.htmlfile inside of the
wwwrootfolder, which will be the starting point.
You can have a look at the content of all these files on my Github commit #ADD smallest publishable static Blazor project, but at this level, they are pretty much empty.
Now you should have a deployable project, for which you can run
dotnet publish -c release and browse into the folder
./bin/release/netstandard2.0/publish/MyBlazorWebAssemblyProject/dist to find all the static files you need to run your Blazor app (We will see in future articles how to host)
We still get to download 5.1MB to display our
Blazor app, mainly due to the size of the
mono.wasm and the
mscorlib.dll files which weight 1.8MB and 1.3MB respectively.
But like most SPA app, since these files are static files, they should ideally be downloaded only once, keeping the reload of the web page to only a few KB fortunately :)
Well, I hope this article helped you to get a better understanding of what is really needed to get a simple
Blazor app without any magic!
In the next article, I plan on writing about hosting this small
Blazor app (in a Docker container for instance :))
Feel free to reach me out on Twitter @vivienfabing or anywhere else, and may the code be with you!