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Ivan Kochurkin
@KvanTTT
Yes, I've already found it, but thank you! :thumbsup:
Jason Bock
@JasonBock
Is there any way to run a project with benchmark tests where LangVersion is set to preview? I want to test some stuff I'm writing for .NET 5.0 and I need to use C# 9 features, but when I have preview in play, I get:
error MSB4086: A numeric comparison was attempted on "$(LangVersion)" that evaluates to "preview" instead of a number, in condition "'$(LangVersion)' == '' Or '$(LangVersion)' < '7.3'".
Jason Bock
@JasonBock
Nevermind....I set it to 9.0 and apparently that worked :)
sanjaysoni5657
@sanjaysoni5657
Can we use dependency injection setup same as we do in dotnet core project for Benchmark Test?
Daniel Hughes
@trampster
I've run into an issue trying to create benchmarks for a .NET 5 c# source generator. It appears that it doesn't accept the LangVersion being set to Preview, but this is currently required for c# source generators
It doesn't work if set to 9.0 like what worked for @JasonBock
Clinton Ingram
@saucecontrol
What does it do if you set it to 9.0? That's the correct solution
Daniel Hughes
@trampster
If I set it to 9.0 it doesn't compile because the Source Generator doesn't generate any source
Clinton Ingram
@saucecontrol
the roslyn build in the 5.0 RC1 SDK definitely recognizes langversion 9.0. are you compiling with an older VS version instead?
Daniel Hughes
@trampster
No I'm on linux
I'm running 5.0.100-rc.1.20452.10
I'm using vscode and running from the commandline
Daniel Hughes
@trampster
The Source Generator announcement says that it requires Preview: https://devblogs.microsoft.com/dotnet/introducing-c-source-generators/
Why do I need to use the Preview LangVersion to consume a Source Generator?
Although Source Generators are not technically a C# language feature, they are in preview. Rather than introduce a new setting just for Source Generators, we decided it would be easier to just use the existing switch that enables preview language features for the C# compiler.
Given that Preview features are things that could benefit most from benchmarking, it seems an odd choice to not support them.
Daniel Hughes
@trampster
Roslyn doesn't have any problems recognizing langversion 9.0, its just that langversion 9.0 doesn't seem to include Source Generators yet.
Clinton Ingram
@saucecontrol
That's very strange... At the time that announcement was made, Roslyn didn't recognize 9.0, only preview. I believe SDK preview 7 was the first to recognize 9.0, so I would have expected all 9.0 roslyn features to fall under that flag at that point
Daniel Hughes
@trampster
I've asked about it on the roslyn gitter, my guess is that Source Generators wasn't deemed ready in time for c# 9.0 so stayed in preview.
The .net 5 RC1 announcement didn't mention Source Generators, which I thought was strange at the time but could be that it has been delayed.
Clinton Ingram
@saucecontrol
ohhhhhh
you can probably set up an inproc benchmark then https://benchmarkdotnet.org/articles/samples/IntroInProcess.html
Martz
@Martz2804_twitter

hi all, I have a question regarding benchmarkdotnet setup, read the docs but I can't seem to find the solution for it. Maybe this isn't the right tool or I (plan to) use it wrong.

Say you have a library you want to perf test with FunctionA() which calls into a lot of code internal to the lib. You want to benchmark the perf of FunctionA() accross multiple versions of the library. Is there a way to automate this "version switching" with benchmarkdotnet? I can't seem to find it

Clinton Ingram
@saucecontrol
You can do it if the library is in a nuget package: https://benchmarkdotnet.org/articles/samples/IntroNuGet.html
TeBeCo
@tebeco
i think theres a sample about nuget and newtonsoft doing this exactly
oO faster
Clinton Ingram
@saucecontrol
lol
TeBeCo
@tebeco
^^
Martz
@Martz2804_twitter
I don't know how I missed this... thank you folks, for the quick answer :) seems to be what I'm after!
TeBeCo
@tebeco
perfect ;)