Blazor WebAssembly Not Ready for .NET Core 3.0 Prime Time

The much-anticipated .NET Core 3.0 milestone release is shipping in five days, Sept. 23, but it won't include a stable Blazor WebAssembly.

Blazor is the red-hot project recently graduated from experimental stage that lets .NET-centric developers use C# for Web development, long an almost exclusive province of JavaScript. WebAssembly, an experimental project itself, is described by steward Mozilla as a low-level assembly-like language with a compact binary format that provides C# with a compilation target for Web projects.

Blazor WebAssembly is described by Microsoft thusly:

The principal hosting model for Blazor is running client-side in the browser on WebAssembly. The Blazor app, its dependencies, and the .NET runtime are downloaded to the browser. The app is executed directly on the browser UI thread. UI updates and event handling occur within the same process. The app's assets are deployed as static files to a web server or service capable of serving static content to clients.

Blazor Server, meanwhile is described like this:

With the Blazor Server hosting model, the app is executed on the server from within an ASP.NET Core app. UI updates, event handling, and JavaScript calls are handled over a SignalR connection.

So Blazor allows for client-side and server-side development, but the client Blazor WebAssembly side of things was more difficult to implement, Microsoft found, and it lagged behind the server-side development effort.

That lag continues, as Microsoft this week said Blazor WebAssembly won't be ready as a stable release in .NET Core 3.0 in announcing a surprise RC1 (Release Candidate) in order to synchronize the SDK across .NET Core and Visual Studio.

"There is also a Blazor WebAssembly preview update available with this release," Daniel Roth, principal program manager for ASP.NET, said in announcing ASP.NET Core and Blazor updates in .NET Core 3.0 RC1. "This update to Blazor WebAssembly still has a Preview 9 version, but carries an updated build number. This is not a release candidate for Blazor WebAssembly. Blazor WebAssembly isn't expected to ship as a stable release until some time after .NET Core 3.0 ships (details coming soon!)."

So stay tuned for those details. A follow-on .NET Core 3.1 release -- which will include late bug fixes and more, and, who knows, maybe a stable Blazor WebAssembly -- is scheduled for November.

About the Author

David Ramel is an editor and writer for Converge360.

comments powered by Disqus


  • Top 3 Blazor Extensions for Visual Studio Code

    Some developers prefer to create applications with Microsoft's open-source Blazor tooling from within the open-source, cross-platform Visual Studio Code editor. Here are the top tools in the VS Code Marketplace for those folk, as measured by the number of installations.

  • How to Invert a Machine Learning Matrix Using C#

    VSM Senior Technical Editor Dr. James McCaffrey, of Microsoft Research, explains why inverting a matrix -- one of the more common tasks in data science and machine learning -- is difficult and presents code that you can use as-is, or as a starting point for custom matrix inversion scenarios.

  • Microsoft Engineer: 'It's Time to Move OData to .NET 5'

    Microsoft engineer Sam Xu says "it’s time to move OData to .NET 5" and in a new blog post he shows how to do just that.

  • Microsoft Goes Virtual with Developer Education in Face of COVID-19

    Like many organizations that host developer educational events, Microsoft has gone virtual amid shelter-in-place directives and a surge in remote work stemming from the COVID-19 pandemic.

  • Microsoft Enhances Low-Code Power Apps

    Microsoft's nod to the low-code movement, Power Apps, has been enhanced with a bevy of new features, including mixed reality, canvas/model support in a new mobile app, UX improvements and more.

.NET Insight

Sign up for our newsletter.

Terms and Privacy Policy consent

I agree to this site's Privacy Policy.

Upcoming Events