Marek Fišera's Avatar

Marek Fišera

@mara.neptuo.com

Engineer @microsoft.com working on .NET on WebAssembly & Blazor Also github.com/maraf & twitter.com/marekfisera

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17.10.2023
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Latest posts by Marek Fišera @mara.neptuo.com

The p in webp stands for “why isn’t this a PNG”

24.04.2024 00:25 👍 10 🔁 5 💬 0 📌 0
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My latest side project, this takes an MSBuild binlog file and transforms it into a Perfetto trace
msbuild-binlog-perfview.pages.dev

18.01.2026 22:05 👍 24 🔁 9 💬 2 📌 0
GitHub - baronfel/mcp-binlog-tool: A Model Context Protocol server binary that exposes information inside an MSBuild Binary Log to LLMs to aid build analysis. A Model Context Protocol server binary that exposes information inside an MSBuild Binary Log to LLMs to aid build analysis. - baronfel/mcp-binlog-tool

MCP server of the day: mcp-binlog-tool. Rather than manually generate and inspect msbuild binary logs, why not have GitHub Copilot just build and analyze it? Those binlogs contain a *LOT* more information than what you see in the terminal output: github.com/baronfel/mcp...

02.03.2026 15:14 👍 3 🔁 3 💬 0 📌 0

Support for multiple files in file-based apps, via the new `#:include` directive. The item type is derived from the file extension in the path/glob you provide & is extensible via MSBuild, so *.cs -> Compile, *.json -> Content, etc. Coming in .NET SDK 10.0.300

25.02.2026 21:20 👍 13 🔁 3 💬 4 📌 0

Firefox is joining the shape() game 🤩

It's a good time for some blobs: css-generators.com/blob/

Or maybe a nice wavy divider: css-generators.com/wavy-divider/

And stay tuned for another generator and more shapes next week! 🤫

26.02.2026 11:23 👍 42 🔁 8 💬 0 📌 0
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"FindRazorSourceFile" v.1.1.1 has been released!🎉
Customize the hotkey for Inspection Mode via project-level config! Set your own key combo, hover any element, and jump straight to the .razor source. No more hardcoded Ctrl+Shift+F! github.com/jsakamoto/Fi... #blazor

19.02.2026 03:46 👍 6 🔁 1 💬 0 📌 0

Out now: The Microsoft Fluent UI #Blazor library v5 RC1!
This is the next major version. Lots of breaking changes but also lots of enhancements, beter APIs, better docs and an MCP server to help you use the library to it's fullest!

17.02.2026 18:30 👍 6 🔁 1 💬 2 📌 0
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GitHub - jsakamoto/Toolbelt.Blazor.WebAssembly.ExtensibleDevServer.UserSecretsExtension: An extension that enables the use of User Secrets in a Blazor WebAssembly Standalone project hosted using the T... An extension that enables the use of User Secrets in a Blazor WebAssembly Standalone project hosted using the Toolbelt.Blazor.WebAssembly.ExtensibleDevServer. - jsakamoto/Toolbelt.Blazor.WebAssembl...

Ever committed your API key to appsettings.json by mistake? 😅
Blazor Wasm User Secrets Extension solves this! Now you can override app settings locally using .NET User Secrets. No more polluting shared files. Perfect for dev team workflows! ⚡️
github.com/jsakamoto/To...
#blazor

14.02.2026 01:22 👍 2 🔁 2 💬 0 📌 0

Let me know when you know more

11.02.2026 21:34 👍 1 🔁 0 💬 0 📌 0

I would love to know more

10.02.2026 21:03 👍 1 🔁 0 💬 1 📌 0

Awesome, thank you

06.02.2026 21:38 👍 1 🔁 0 💬 0 📌 0

Any specific optimizations on the interop layer?

06.02.2026 20:05 👍 0 🔁 0 💬 1 📌 0

I would love to hear more details

05.02.2026 18:49 👍 0 🔁 0 💬 1 📌 0
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💡 We're exploring a new idea for PowerToys Command Palette: a configurable dock where you can pin your favorite commands and extensions for quick access.

For examples and proof-of-concept code, check out the issue - we'd love your feedback 👇
github.com/microsoft/Po...

29.01.2026 17:58 👍 6 🔁 4 💬 0 📌 3
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Introducing OpenSilver 3.3: Blazor Components Now Run Directly Inside XAML Applications – OpenSilver Blazor components now work inside XAML, no bridges or wrappers, and your architecture stays the same. One codebase, every platform. Modernize WPF apps incrementally. OpenSilver 3.3 is free and…

Introducing OpenSilver 3.3 - Blazor Components Now Run Directly Inside XAML Applications

opensilver.net/announcement...

#opensilver #xaml #blazor #dotnet #appdev #silverlight #csharp #wpf

27.01.2026 16:00 👍 3 🔁 4 💬 0 📌 1
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.NET AI Community Standup - Using the GitHub Copilot CLI and SDK for .NET dev YouTube video by dotnet

Stop what you are doing and watch this right now #Blazor #AI #Copiliot - www.youtube.com/live/aKUZCxT...

29.01.2026 03:19 👍 7 🔁 2 💬 1 📌 0
Image showing a DataGrid with nested, hierarchical rows

Image showing a DataGrid with nested, hierarchical rows

Coming soon to the Fluent UI #Blazor library... Hierarchical data. Finally, nesting rows will be possible!

Oh, and I am now allowed to tag this with #MVPBuzz 😁

22.01.2026 21:42 👍 3 🔁 1 💬 1 📌 0
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GitHub - fast-actions/setup-dotnet: High-performance GitHub Action for .NET SDK and Runtime installation with parallel downloads, caching, and intelligent version resolution High-performance GitHub Action for .NET SDK and Runtime installation with parallel downloads, caching, and intelligent version resolution - fast-actions/setup-dotnet

Tired of slow .NET setup in GitHub Actions?
I built a fast, performant alternative to actions/setup-dotnet with parallel downloads, caching & smart version resolving.

github.com/fast-actions...

We‘re using this Action @scalar.com and reduced the execution time from 24s to 2s!

19.01.2026 15:34 👍 3 🔁 2 💬 0 📌 0
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Ready for the first cool demo of the year?

A mini Mario world with keyboard control. Yes, you can move Mario and also jump! 👀

Demo: codepen.io/t_afif/full/... via @codepen.io

✔️ 100% CSS Magic
✔️ Minimal HTML
❌ 0% JavaScript

A Chrome-only experimentation using modern CSS.

02.01.2026 13:39 👍 126 🔁 24 💬 5 📌 10
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Tech is in an interesting place where some of the most accomplished engineers in the industry now say their job is now just telling AI to write all the code, debug it and fix the bugs.

Some of this is marketing hype from people who are selling AI tools (Boris works on Claude Code) but it rings true

27.12.2025 17:44 👍 110 🔁 22 💬 26 📌 4
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Another winter break coding side quest...

I created a CLI tool called "burrow" for managing local secrets, inspired by `dotnet user-secrets`. But, it’s a standalone executable and it uses SQLite instead of JSON as the backing store.

Check it out at safia.rocks/burrow/ 🐰

27.12.2025 17:09 👍 96 🔁 9 💬 8 📌 2

🚀 This week I improved MTP (Microsoft.Testing.Platform) to support WASM, browser, WASI 🌐 and made progress on Android 🤖📱 & iOS 🍎📱.

Modern apps deserve modern testing, MTP makes it simple, fast, and future-ready!

#dotnet #testing #MTP

19.12.2025 13:00 👍 2 🔁 2 💬 0 📌 0
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Ignite UI Releases 50+ Powerful Open-Source Components We are empowering the open-source community by offering a set of 50+ open-source components across Angular, React, Blazor, and Web Components. Explore all.

Infragistics just made 50+ Ignite UI components available for free and open-source! Support for Angular, React, Web Components, and Blazor: www.infragistics.com/blogs/open-s...
#blazor #dotnet #IgniteUI

17.12.2025 00:58 👍 4 🔁 1 💬 0 📌 0
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File-based apps - .NET Learn how to create, build, and run C# applications from a single file without a project file.

New reference article detailing lots of info about running C# file-based apps via `dotnet run` now available! Makes for great input to a coding agent when working on file-based apps.

learn.microsoft.com/dotnet/core/...

19.12.2025 20:02 👍 23 🔁 11 💬 1 📌 1
Fluent UI Blazor Documentation & Demo site Microsoft Fluent UI Blazor library. For use with ASP.NET Core Blazor applications

Out now: The Microsoft Fluent UI #Blazor library v4.13.2! Maintenance release with .NET 10 support, Templates fixes, and about a dozen other PRs
Details at fluentui-blazor.net/WhatsNew. Packages are on NuGet. Now back to getting a v5 RC out of the door...

27.11.2025 19:00 👍 5 🔁 3 💬 0 📌 0
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Talk .NET with .NET Team: December Edition, Mon, Dec 8, 2025, 5:30 PM | Meetup We’re wrapping up the year with a supercharged **December edition** of **Talk .NET with .NET Team meetup series**! 🚀🎄 Get ready for an evening full of performance insight

Let me invite you to our last #dotnet Meetup this year.

We have 3 great talks prepared for you, and of course food.

📍 Microsoft Office (Delta Building, Vyskočilova 1561/4a, Prague 4)
📅 Monday, December 8, 2025
🕗 5.30pm - 9.00pm

English, Free entry

www.meetup.com/microsoft-ev...

28.11.2025 16:17 👍 3 🔁 2 💬 0 📌 0
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🚀 After validating on the .NET 10 SDK, the first stable release of "Find Razor Source File" is live!
github.com/jsakamoto/Fi... #blazor
Streamline your Blazor development: jump straight from any clicked element in your browser to the exact `.razor` file in Visual Studio or VS Code!

26.11.2025 07:00 👍 1 🔁 1 💬 0 📌 0
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GitHub - DamianEdwards/RazorTemplates: Experiment creating templating extensions for Razor Copmonents Experiment creating templating extensions for Razor Copmonents - DamianEdwards/RazorTemplates

Got nerd-sniped on a saturday morning github.com/DamianEdward...

22.11.2025 22:52 👍 15 🔁 1 💬 3 📌 0
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Announcing Oqtane 10.0.0 for .NET 10! This is a major release including Passkey support, improvements to the Oqtane Application Template, etc... 77 pull requests by 6 contributors. www.oqtane.org/blog/!/132/a... #blazor #oqtane

17.11.2025 14:05 👍 5 🔁 1 💬 0 📌 0

One thing I started noticing recently is that competent engineers give up their credibility due to AI.

Twice already highly competent engineers I respect sent a PR that turned out to have very subtle issues. These issues would not be possible if a human understood it.

15.11.2025 00:40 👍 535 🔁 90 💬 22 📌 5