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David Fowler Profile picture
@davidfowl
Aug 3, 2021 • 4 tweets • 2 min read • Read on X
Here's an interesting .NET-ism. Async methods capture the execution context on entry and restore them on exit. What does the following print? #dotnet #csharp Image
It prints, Before: 0, After: 10. The async local value bled out of the method call because it was synchronous method that directly returned the task.
This on the other hand will not let the async local value bleed out of the method. Image
This is roughly what it translates to: Image

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More from @davidfowl

David Fowler Profile picture
Apr 28
A customer mentioned trying to use default interface implementations to do "mixin" style programming in C# and it totally nerd sniped me. 🤔

#dotnet #csharp Image
Here's the sample: Image
The intent is to try to avoid reflection and use C# language features to drive composition where possible.

PS: I don't know if this is a good idea or not, but it's fun 😅.
Read 4 tweets
David Fowler Profile picture
Jul 11, 2023
Here's some code that is on the hot path on your application and you want to optimize it. This is what a typical C# developer would write (actually copilot wrote this). It's pretty clear, but suboptimal. How could you go about improving it? #dotnet #csharp
There are lots of allocations here:
1. The string[] splitting up query string parts by &
2. Each key value pair string[] splitting each part by =
3. The List<string> of new results
4. The final string
One more assumption you can make: The instanceId will only occur once or 0 times in the input querystring.
Read 22 tweets
David Fowler Profile picture
Dec 31, 2022
Discrete events masquerading as a workflow should be expressed as such. Consider the following event-based model: #dotnet
The game has 3 events:
- GameStarted
- GameEnded
- OnQuestion

The order of execution should be obvious from the naming...
The application doesn't control the event loop, the event loop will trigger the events at the appropriate time. Storing state across events means understanding the order in which they fire, the thread safety of such events and more (do they fire concurrently? can you block?)
Read 6 tweets
David Fowler Profile picture
Dec 31, 2022
Currently designing how this trivia game will work on multiple servers. I have 3 architectures in mind (Twitter can help me pick one, but I have a preferred one). Both clients are part of the same game. Games are ephemeral and last a maximum of 2 minutes.
Architecture 1 - Using Redis as the game state storage and SignalR backplane.
Architecture 2 - Use Orleans grains as the SignalR backplane and state storage for a game.
Read 9 tweets
David Fowler Profile picture
Dec 17, 2022
It's Friday so time for spicy opinions. Every single sample ASP.NET Core project I see uses CQRS and the mediator pattern or CLEAN architecture. I'm over the over engineering 🙃. #dotnet
I lean very heavily towards YAGNI and readable code with minimal abstractions until needed. I appreciate that every situation is different, but like anything it's hard to appreciate the benefits when the "scale" problem isn't evident.
Blindly applying patterns bugs me ALOT. I don't subscribe to the dogma, I don't write code that way...
Read 9 tweets
David Fowler Profile picture
Dec 11, 2022
Another cool tye feature is networking support between containers and processes on the host. This nginx configuration is referring the process running on the machine by host name "sample" but that application isn't running in a container.
It manages all of the tricky ways to communicate between containers and local machine using (host.docker.internal) etc. This lets you run and debug your processes normally and run what needs to run as containers in your inner loop.
It creates an environment that looks like this behind the scenes.
Read 4 tweets

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