Support C# 10 in XamariniOS@2 task

Required Information

Type: Feature

Enter Task Name: XamariniOS

Environment

• Server - Azure Pipelines

• Agent - Hosted

Issue Description

The XamariniOS task uses the Mono version of MSBuild, which doesn’t support C#10. The Hosted build agents in Azure Pipelines have Visual Studio 2022 for Mac installed. It is possible to use Mono to run the VS2022 version of MSBuild, which does support C#10. However, it doesn’t seem like it’s possible to configure the XamariniOS task to do this.

I have tried the following:

• specify the following as an input parameter to the task:

    buildToolLocation: '/Library/Frameworks/Mono.framework/Versions/Current/Commands/mono "/Applications/Visual Studio.app/Contents/MonoBundle/MSBuild/Current/bin/MSBuild.dll"'

This resulted in the error

Not found build tool: /Library/Frameworks/Mono.framework/Versions/Current/Commands/mono "/Applications/Visual Studio.app/Contents/MonoBundle/MSBuild/Current/bin/MSBuild.dll"

• The workaround described here: https://medium.com/@tarmopr/how-to-fix-ci-build-with-azure-hosted-agent-for-xamarin-ios-project-that-uses-c-10-cc050ba7d459 .

Desired functionality: Have some way of choosing the version of MSBuild included in Visual Studio Mac.

[vmapetr]

@benlings Thanks for reporting! We are working on more prioritized issues now but will get back to this one soon

[wesleyscaldwell]

Yeah I bit the bullet and upgraded the project to Maui, which in some places was easier than expected. But I ran into several little bugs that made the upgrade extremely time consuming.

I found that once you have the upgrade completed successfully and all your plugins and extensions upgraded correctly it works, but trying to diagnose what wasn’t working took a lot longer than expected. The error messages were pretty misleading, I spent a lot of time trying to resolve symptoms and not the actual root issues.

I also had inconsistent issues with shell between platforms.