The High Performance Types You Ignored for Years in .NET

Hello, everybody, I'm Nick, and in this video, I will show you a type that we had in C# and .NET since .NET Framework 2 that can offer similar benefits to the Span type. I will explain what it is, how it works and why it might still be relevant if you're stuck in an old .NET version.

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#csharp #dotnet

[gctypo]

Good to know. I'm stuck with a Framework 4.0 codebase (yes, that's a ".0") and having something that can serve the place of Span<T> is really nice.

[JakobStrasser]

Thanks, stuck in framework 4.8 so this will help!

[AndyNeko]

Thank you so much! I'm reading & coding with book C# 10 in a Nutshell, and this Span thing comes in Chap. 23. I'll get there soon!

[k_pavel]

We have three names:
Nick
Rick
**some pause**
Richard

[IronTeddyBear]

Thank you @Nick, I still work on projects in .NET 4.x and I didn't even know this ArraySegment even existed before.

[reikooters]

Bought your course to support you. Always learn something interesting from your videos. Best person on Youtube for C# stuff. Thank you!

[saymehname]

Thanks for this I wasn’t aware of either. I’m a noob but you’ve taught me a lot

[peceed]

"Fun" fact: in Java every String is a Span over internal shared char array. This way substring was blazing fast, but it led to many memory leaks because GC was unable to free unused parts of that char array.

[Fnalspace]

Didn´t knew ArraySegment and StringSegment, but as we already switched to .NET 7, we already use span for all other cases.
But what about you a case where you need to remove some items in a internally stored collection and you have a method "bool RemoveItems(params IItem items);". It would not make sense to pass down a ReadOnlySpan<IItem> as argument instead isnt´t it?

[IllidanS]

ArraySegment is really nice when the byref-like nature of Span is something you cannot work around, like in an "out" parameter, a class field, generics etc. The proper counterpart to Span would be Memory there, but ArraySegment just sounds nicer.

[Pouya..]

Nick, please make a video about finding bottlenecks in high-load applications and how we should approach them when it is in production. How we should find out why our app running slow on high-load

[yobofunk]

It would be interesting to run the benchmark on struct and class. Wouldn't decrease the benefit as class are supposed to be passed by ref?

[garcipat]

Can you use spans only for sequencial items? That if you enumeratithhe there you cannot to AsSpan afterwards?

[carmineos]

Instead of AsSpan().Slice(...), calling AsSpan overload which takes a range parameter should be even faster

[dejowe]

Nice video. :)
I am curious about your Benchmarks.cs file. Is it accessible from somewhere?

[modernkennnern]

Spans will become a lot better when collection expressions arrive in C# 12.

Span<int> ints = [1, 2, 3]; // will be stack-allocated

[PatrickHoodDaniel]

Excellent content. I am always going to your videos to get great C# information, which is my preferred language. However, I have been wanting to get into ML with C#, but python seems to be dominant in this field. How do you feel about this subject. I don't particularly want to learn python, but I may have to. I just love C# so much, it is a shame I would need to switch.

[pawelwelsberg]

Can be very useful especially if you are following functional programming practices: your data is immutable.

[pavlindrom]

Wouldn't Take(3) without the ToArray be similarly performant? I thought you'd show that as a comparison too, and now I'm curious how it compares.

[Haapavuo]

Hello, this is Nick Spanchap. Today we talk about Spanlike structures.