Regarding Twitter’s “new login from unknown device” alerts…

One nice thing that’s come about from the increased scrutiny that online security has been receiving is that it’s gone from being considered paranoid to becoming completely expected to be notified regarding incidents such as new logins, password changes, failed 2FA attempts, and other security-related activity. But any time a metric gets noticed, it also gets gamified and either decreases in value or ceases to be relevant altogether – a principal first documented by British economist Charles Goodhart and now known as Goodhart’s Law and demonstrated in this wonderful Sketch Plantations depiction:

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AsyncLock 3.0 for .NET 5.0 Released

An updated version of AsyncLock has just been released on GitHub and Nuget with improved support for reentrancy detection.

AsyncLock is a async/await-native anonymous lock for .NET and .NET Core that allows safely using async/await while holding a lock, for example:

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Multi-touch gestures with native touchpad drivers on Linux

Perhaps one of the biggest difficulties in setting up a Linux system for desktop/home use is the fragmentation of the ecosystem, with many different options claiming to get you from point a to somewhere in the vicinity of point b, each with their subtle differences (and at least a few “gotchas” along the way). An easy example: in 2020, you’d think there would be an easy answer to getting a trackpad/touchpad up and running with support for multi-touch gestures at least on par with the experience on Windows and macOS – after all, it’s been 12 years since Apple made multi-touch popular with 2008 MacBook Air.

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Scripting in rust with self-interpreting source code

I have a soft spot in my heart for rust and a passionate distrust (that has slowly turned into hatred) for interpreted, loosely typed languages, but it’s hard to deny the convenience of being able to bang out a bash script you can literally just write and run without having to deal with the edit-compile-run loop, let alone create a new project, worry about whether or not you’re going to check it into version control, and everything else that somehow tends to go hand-in-hand with modern strongly typed languages.

A nifty but scarcely known rust feature is that the language parser will ignore a shebang at the start of the source code file, meaning you can install an interpreter that will compile and run your rust code when you execute the .rs file – without losing the ability to compile it normally. cargo-script is one such interpreter, meaning you can cargo install cargo-script then execute your source code (after making it executable, :! chmod +x %) with something like this:

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SecureStore: the open secrets container format

It’s been a while since we first released our SecureStore.NET library for C# and ASP.NET developers back in 2017, as a solution for developers looking for an uncomplicated way of safely and securely storing secrets without needing to build and maintain an entire infrastructure catering to that end. Originally built way back in 2015 to support secrets storage in legacy ASP.NET applications, SecureStore.NET has been since updated for ASP.NET Core and UWP desktop application development, and now we’re proud to announce the release of SecureStore 1.0 with multi-platform and cross-framework support, with an updated schema making a few more features possible and official implementations in C#/.NET and Rust.

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Adding a Razor Pages ModelBindingProvider in ASP.NET Core

Microsoft’s official documentation on adding custom model binding providers to convert between (typically) a string and a custom type for complex model binding in ASP.NET Core as of .NET Core 3.1 goes something like this:

  • Create an IModelBinder for your class and use [ModelBinder(BinderType = typeof(MyModelEntityBinder)] to decorate each and every binding site, e.g.
    public async Task<IActionResult> OnPost([ModelBinder(BinderType = typeof(MyModelEntityBinder)]) MyModel model), which provides the runtime with the type information it needs to instantiate the model binding provider and convert the input to a model.
  • Optionally create an IModelBinderProvider class and register it with the ASP.NET Core host to provide the type information ahead-of-time (once and for all), so that you can instead use the barebones and much shorter decoration at each model binding site instead:
    public async Task<IActionResult> OnPost([ModelBinder] MyModel model)

The latter is significantly easier on the eyes and far less error prone… but where does the type registration take place? Per the linked documentation, the recommendation is the following in Startup.cs:

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A persistent cache for ASP.NET Core

One of the nicest things about ASP.NET Core is the availability of certain singleton models that greatly simplify some very common developer needs. Given that (depending on who you ask) one of the two hardest problems in computing is caching1, it’s extremely helpful that ASP.NET Core ships with several models for caching data, chief of which are IMemoryCache and IDistributedCache, added to an ASP.NET Core application via dependency injection and then available to both the framework and the application itself. Although these two expose almost identical APIs, they differ rather significantly in semantics.2

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  1. Although that *probably* refers more to cache coherence rather than simply key-value persistence, to be perfectly frank. 

  2. It is extremely refreshing to see Microsoft adopting the Haskell/Rust approach of using types to express/convey intention and semantics rather than merely shape. 

Compare streams quickly and efficiently in C# and .NET

Have you ever needed to compare the contents of two files (or other streams), and it mattered how quickly you got it done? To be frank, it doesn’t normally come up in the list of things you may need on a daily code-crunching basis, but that rather depends on what kind of programs you tend to write. In our world, let’s just say it’s not an uncommon task.

At a first blush, it would seem to be no harder than comparing two arrays. A pointer reading from each file, compare bytes as you come across them, and bail when things differ. And it would be that easy if you were to use memory-mapped files and let the OS map a file on disk to a range in memory, but that has some drawbacks that may not always be OK depending on what you’re trying to do with the files (or streams) in question. It also requires having a physical path on the filesystem that you can pass in to the kernel, and it unduly burdens the kernel with some not insignificant workloads that aren’t (in practice) subject to the same scheduling and fairness guarantees that user code would be, and they can tend to slow down older machines significantly1.

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  1. Especially under Windows 

Easy Window Switcher 1.2.2

Just a quick heads-up: Easy Window Switcher 1.2.2 has just been released and it brings correct hotkey support for the following keyboard layouts:

  • Swedish
  • German Swiss (QWERTZ)
  • International Spanish

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.NET Standard and new .NET Framework Logo and Banner

For yesterday’s NeoSmart.Collections release announcement, we had need of an updated logo for Microsoft’s .NET, and were unable to find something corresponding to .NET Standard.

For those of us that were around when C# was first introduced, this is probably the logo that most represents the .NET Framework:1

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  1. I tried extremely hard to find this in a higher resolution or even just losslessly resized, but to no avail. Give me a holler if you have something better we can preserve!