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Hey HN, I'm evaluating the use of C#/.NET as a programming language. In light of Mono being merged into .NET, I was downloading the SDK and was quite surprised

Hey HN, I'm evaluating the use of C#/.NET as a programming language. In light of Mono being merged into .NET, I was downloading the SDK and was quite surprised that it contains DLLs that are explicitly licensed under a commercial license and, in fact, seems to require the purchase of a Visual Studio Professional license. I have no problem paying for licenses, but this one seems to require a) a monthly subscription and b) is advertised on Microsoft's own site as free/open source. Any help from all you internet lawyers out there? Thank you.

layer8 3y ago
Maybe it’s multi-licensed? You can freely choose which one you use if more than one license exists for a given product.
- janosdebugs 3y ago
  It doesn't seem like it, the language seems to be pretty explicit. To me it reads like the Windows .NET SDK builds including proprietary DLLs and they didn't quite sort out their licensing.
andyjohnson0 3y ago
> In light of Mono being merged into .NET I appreciate that this is tangential to your question about licencing, but I wasn't aware of this merge and a cursory search isn't very revealing. Any pointers? I thought the situation was that Microsoft's .NET implementation now natively targets Windows, Linux, and Mac. And Mono still exists in parallel to this. What am I missing?
- janjones 3y ago
  Mono is developed by Xamarin which was acquired by Microsoft: https://blogs.microsoft.com/blog/2016/02/24/microsoft-to-acquire-xamarin-and-empower-more-developers-to-build-apps-on-any-device/ https://blogs.microsoft.com/blog/2016/02/24/microsoft-to-acq...
  - andyjohnson0 3y ago
    Yes, I know. And I appreciate that Xamarin Forms probably contributed to Maui, which is part of .NET. But I was specifically asking about Mono.
- Merad 3y ago
  You are correct. Mono is still an alternative runtime for .Net. It hasn't been merged into .Net and I'm not aware of any plans to do so.
  - lewispollard 3y ago
    The mono code is part of the runtime since .NET 6
- janosdebugs 3y ago
  You seem to be correct, I have read contradictory information. At the same time, if all of Microsoft's might is standing behind .NET, can mono be a full alternative? Edit: at the very least, Godot (game engine) has moved from Mono to .NET.
- MarkSweep 3y ago
  Just as Microsoft forked .NET Framework to make CoreCLR, they forked Mono. Both live in the http://github.com/dotnet/runtime http://github.com/dotnet/runtime repository. Both share most of the same C# code base for their runtime libraries. Mono is used for Blazor (WASM), iOS, and Android. This merging was announced as part of .NET 5 but I recall that it was not complete till .NET 6. https://devblogs.microsoft.com/dotnet/introducing-net-5/ https://devblogs.microsoft.com/dotnet/introducing-net-5/
pjc50 3y ago
This is clearly wrong since they're not chasing people for licenses, and the licensing of the whole thing is "free to use". It might be closed source, I'd have to check a DIY build from github to see whether it is included in that. It's not a mono "merge" but a mono replacement; the whole ".NET core" ecosystem is a new(ish) multi-platform runtime and compiler. Possibly file a ticket on their github to clarify this?
- tailspin2019 3y ago
  > Possibly file a ticket on their github to clarify this? At the time of writing the link on this submission is a ticket which they seem to have opened. And based on the link in that ticket to this… https://github.com/dotnet/core/blob/main/license-information-windows.md https://github.com/dotnet/core/blob/main/license-information... … I don’t think what they’re saying is clearly wrong. I can see why they’re seeking some clarification.
- janosdebugs 3y ago
  The link on this post leads to that ticket. That's where the GitHub issue form lead me.
deleted 3y ago
[deleted]
andyjohnson0 3y ago
Rather than in a comment, your question should go in the submission's textbox. As comments get addedand move up and down, it's now no longer clear that your comment original [1] represents what you're asking the hive mind. [1] https://news.ycombinator.com/item?id=35985833 https://news.ycombinator.com/item?id=35985833
- janosdebugs 3y ago
  Thank you, I entered both a link and a text, that seems to have messed things up.
60654 3y ago
In short: .NET multiplatform itself is open source as I'm sure you've seen here: https://learn.microsoft.com/en-us/dotnet/core/introduction https://learn.microsoft.com/en-us/dotnet/core/introduction A few specific DLLs like Visual C++ redistributables are not open source, but they are separately licensed for redistribution. VS Pro is not needed. Hope this helps!
- tailspin2019 3y ago
  I think part of the confusion is coming specifically from this bit of the license information file which OP linked to: > The following binaries are licensed with the Visual Studio 2019 License (not as a "trial") I can’t work out what this means, other than that you must have a VS 2019 licence (and not a trial licence)? Is that the wrong interpretation of that wording?

layer8 3y ago

Maybe it’s multi-licensed? You can freely choose which one you use if more than one license exists for a given product.

janosdebugs 3y ago
It doesn't seem like it, the language seems to be pretty explicit. To me it reads like the Windows .NET SDK builds including proprietary DLLs and they didn't quite sort out their licensing.

andyjohnson0 3y ago

> In light of Mono being merged into .NET I appreciate that this is tangential to your question about licencing, but I wasn't aware of this merge and a cursory search isn't very revealing. Any pointers? I thought the situation was that Microsoft's .NET implementation now natively targets Windows, Linux, and Mac. And Mono still exists in parallel to this. What am I missing?

janjones 3y ago
Mono is developed by Xamarin which was acquired by Microsoft: https://blogs.microsoft.com/blog/2016/02/24/microsoft-to-acquire-xamarin-and-empower-more-developers-to-build-apps-on-any-device/ https://blogs.microsoft.com/blog/2016/02/24/microsoft-to-acq...
- andyjohnson0 3y ago
  Yes, I know. And I appreciate that Xamarin Forms probably contributed to Maui, which is part of .NET. But I was specifically asking about Mono.
Merad 3y ago
You are correct. Mono is still an alternative runtime for .Net. It hasn't been merged into .Net and I'm not aware of any plans to do so.
- lewispollard 3y ago
  The mono code is part of the runtime since .NET 6
janosdebugs 3y ago
You seem to be correct, I have read contradictory information. At the same time, if all of Microsoft's might is standing behind .NET, can mono be a full alternative? Edit: at the very least, Godot (game engine) has moved from Mono to .NET.
MarkSweep 3y ago
Just as Microsoft forked .NET Framework to make CoreCLR, they forked Mono. Both live in the http://github.com/dotnet/runtime http://github.com/dotnet/runtime repository. Both share most of the same C# code base for their runtime libraries. Mono is used for Blazor (WASM), iOS, and Android. This merging was announced as part of .NET 5 but I recall that it was not complete till .NET 6. https://devblogs.microsoft.com/dotnet/introducing-net-5/ https://devblogs.microsoft.com/dotnet/introducing-net-5/

pjc50 3y ago

This is clearly wrong since they're not chasing people for licenses, and the licensing of the whole thing is "free to use". It might be closed source, I'd have to check a DIY build from github to see whether it is included in that. It's not a mono "merge" but a mono replacement; the whole ".NET core" ecosystem is a new(ish) multi-platform runtime and compiler. Possibly file a ticket on their github to clarify this?

tailspin2019 3y ago
> Possibly file a ticket on their github to clarify this? At the time of writing the link on this submission is a ticket which they seem to have opened. And based on the link in that ticket to this… https://github.com/dotnet/core/blob/main/license-information-windows.md https://github.com/dotnet/core/blob/main/license-information... … I don’t think what they’re saying is clearly wrong. I can see why they’re seeking some clarification.
janosdebugs 3y ago
The link on this post leads to that ticket. That's where the GitHub issue form lead me.

deleted 3y ago

[deleted]

andyjohnson0 3y ago

Rather than in a comment, your question should go in the submission's textbox. As comments get addedand move up and down, it's now no longer clear that your comment original [1] represents what you're asking the hive mind. [1] https://news.ycombinator.com/item?id=35985833 https://news.ycombinator.com/item?id=35985833

janosdebugs 3y ago
Thank you, I entered both a link and a text, that seems to have messed things up.

60654 3y ago

In short: .NET multiplatform itself is open source as I'm sure you've seen here: https://learn.microsoft.com/en-us/dotnet/core/introduction https://learn.microsoft.com/en-us/dotnet/core/introduction A few specific DLLs like Visual C++ redistributables are not open source, but they are separately licensed for redistribution. VS Pro is not needed. Hope this helps!

tailspin2019 3y ago
I think part of the confusion is coming specifically from this bit of the license information file which OP linked to: > The following binaries are licensed with the Visual Studio 2019 License (not as a "trial") I can’t work out what this means, other than that you must have a VS 2019 licence (and not a trial licence)? Is that the wrong interpretation of that wording?