As usual, there are a boatload of new APIs coming in .NET 6. Most of these are driven by custom requests. Lets talk about some of them. #dotnet #aspnetcore
In .NET 6, there's a new low-level API to enable reading/writing of files without using a FileStream. It also supports scatter/gather IO (multiple buffers) and overlapping reads and writes at a given file offset. Image
There are a couple of new ways to access a process path and process id without allocating a new process object: Image
Generating random numbers from a CSPNG (Cryptographically Secure Pseudorandom Number Generator) is a little easier: Image
We finally added Parallel.ForEachAsync, a way to schedule asynchronous work that allows you to control the degree of parallelism: Image
We added a helper to make it easier to throw if a required section of configuration is missing: Image
There's a ton of new LINQ methods as well. It got lots of love in this release. Here's a new helper to chunk any IEnumerable<T> into batches: Image
Don't keep bit math in your head? Me neither, here are some new helpers for working with powers of 2: Image
There's now a much easier (and properly implemented) way to wait for task to complete asynchronously. The following code will yield the await if it hasn't completed in 10 seconds. The operation might still be running! This is for un-cancellable operations! Image
More LINQ! There are now MaxBy and MinBy methods: Image
We added an entirely new metrics API based on @opentelemetry in .NET 6. It supports dimensions, is *super* efficient and will have exporters for popular metric sinks (prometheus etc). ImageImage
OK that's it for now! Enjoy playing with .NET 6 previews and we love you feedback.
OK one more (I posted this a while back). Native support for Posix signal handling. We also emulate a couple of signals on windows. Image
Oh wait this is one coming in preview7 I should mention. You can all delete your helper methods that do this now 😅. Image
If you feel like using C APIs to allocate memory because you're a l33t hacker or you need to need to allocate native memory, the look no further. Don't forget to free! Image
Last but not least, a modern timer API (I think this is the 5th timer API in .NET now). It's fully async and isn't plagued by the types of gotchas the other timers are plagued with like object lifetime issues, no asynchronous callbacks etc. ImageImage

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More from @davidfowl

Jul 8
Here’s another “auth is hard in .NET” thread reddit.com/r/dotnet/comme… #dotnet #aspnetcore
To help the team contextualize why it is hard outside of the domain itself being hard, it would be great to see some code samples. Samples from other frameworks that are runnable. Most of these threads conflate everything under the auth banner and require 20 questions understand
the problem. It’s fine to rant but we want to make real improvements. After the rant please show the code. We need to understand the scenario, the exact scenario. Sharing code leaves less room for ambiguity.
Read 10 tweets
Jun 27
COVID will be “over” when people stop posting tests results on Twitter. It’s not “normal” or “endemic” yet socially. It feels pretty inevitable at this point, there’s still a guilt associated with having it (you could have spread it unknowingly).
It’ll be “like the flu” and “normalized” socially when people stop doing that. So, IMHO Covid isn’t “over” yet…
As an example of what this “new normal” feels like: Hanging out with people and then waiting for 3-5 days to pass to see if you have any symptoms. Knowing you have to travel in a week and trying to reduce the possibility of getting it by reducing too much human infraction before.
Read 5 tweets
Jun 27
This thread was good because it helped clarify my thinking. There are 2 phases (for simplicity) where ClaimsPrincipal shows up:
- The authentication flow
- The authorization flow

Claims are typically used to store authentication data. #dotnet #aspnetcore 🧵👇🏾
That data is then used to look up more user information (profile data) usually store in a database/cache. This profile data usually also contains permissions and authorization rules are then run over this user for different types of application "resources".
These resources typically include (but are not restricted to):
- The HTTP endpoint
- Some business object

The authorization process usually needs access to all user profile information including permissions to do authorization checks.
Read 11 tweets
Jun 26
The oral history of Dave Cutler is a real gem:
Part 1:
Part 2:
Windows NT is a marvel of an operating system and his work has been immensely impactful on the industry at large. I also love that he's an engineer through and through.
Some gems:
- Engineers should care *deeply* about the quality of the code they write (he hated when he had bugs assigned to him).
- Coding != Software engineering. They brought strong engineering culture to Microsoft from DEC.
- Go interview elsewhere to know your worth😉.
Watching these luminaries, I see a pattern of small teams of highly capable people building largely impactful software projects.
Read 4 tweets
Jun 15
New feature that came out with minimal APIs in .NET 7 preview 5 (devblogs.microsoft.com/dotnet/asp-net…), the ability to declare parameter list surrogates: #dotnet #aspnetcore
You can refactor long argument lists into structs as a "zero cost abstraction". The struct's members will be bound as if they were parameters declared on the method.
It's not all or nothing, you can also do this with a subset of the parameters:
Read 5 tweets
Jun 15
Let me take you on my @msftorleans journey. Let's say you wanted to define a class that let callers subscribe to an event C#. It could look like this: #dotnet
This implementation uses C# events, but let's be a little more verbose and define the contract for subscribing and unsubscribing callbacks:
Now we store a list of Action for subscribers, and we mutate this list when there's a new subscriber or if one is being removed. Calling DoThing will call each subscriber sequentially.

Now lets make this a little more object oriented and Java like (no shade my java people):
Read 7 tweets

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