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Previous csproj had <AndroidEnableMultiDex>. It looks like in 4.5 that's changed to <AndroidEnableMultipleDex>. This migration is not performed automatically meaning the user has to go in and check the multidex option after upgrading.
Microsoft Visual Studio Professional 2017
Version 15.2 (26430.4) Release
Microsoft .NET Framework
Installed Version: Professional
Visual Basic 2017 00369-60000-00001-AA771
Microsoft Visual Basic 2017
Visual C# 2017 00369-60000-00001-AA771
Microsoft Visual C# 2017
Visual C++ 2017 00369-60000-00001-AA771
Microsoft Visual C++ 2017
Visual F# 4.1 00369-60000-00001-AA771
Microsoft Visual F# 4.1
Application Insights Tools for Visual Studio Package 8.6.00404.2
Application Insights Tools for Visual Studio
ASP.NET and Web Tools 2017 15.0.30503.0
ASP.NET and Web Tools 2017
Common Azure Tools 1.9
Provides common services for use by Azure Mobile Services and Microsoft Azure Tools.
JetBrains ReSharper Ultimate 2017.1.2 Build 108.0.20170428.75743
JetBrains ReSharper Ultimate package for Microsoft Visual Studio. For more information about ReSharper Ultimate, visit http://www.jetbrains.com/resharper. Copyright © 2017 JetBrains, Inc.
Merq 1.1.17-rc (cba4571)
Command Bus, Event Stream and Async Manager for Visual Studio extensions.
Microsoft Visual Studio VC Package 1.0
Microsoft Visual Studio VC Package
Mono Debugging for Visual Studio Mono.Debugging.VisualStudio
Support for debugging Mono processes with Visual Studio.
NuGet Package Manager 4.2.0
NuGet Package Manager in Visual Studio. For more information about NuGet, visit http://docs.nuget.org/.
TypeScript tools for Visual Studio
Visual Studio tools for CMake 1.0
Visual Studio tools for CMake
Visual Studio Tools for Universal Windows Apps 15.0.26430.01
The Visual Studio Tools for Universal Windows apps allow you to build a single universal app experience that can reach every device running Windows 10: phone, tablet, PC, and more. It includes the Microsoft Windows 10 Software Development Kit.
Xamarin 18.104.22.1683 (c871575)
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.
Xamarin.Android SDK 22.214.171.124 (448f54f)
Xamarin.Android Reference Assemblies and MSBuild support.
Xamarin.iOS and Xamarin.Mac SDK 10.10.0.30 (30b6e87)
Xamarin.iOS and Xamarin.Mac Reference Assemblies and MSBuild support.
Actually it looks like the Xamarin in VS 15.2 is setting <AndroidEnableMultipleDex> when you set the checkbox in the project settings but is only looking at <AndroidEnableMuliDex> when deciding whether to multidex or not.
Fixed. This will likely make it in our next release. Thanks for the report!
*** Bug 56204 has been marked as a duplicate of this bug. ***
When will the fix be available? Currently, I'm stuck as my multidex projects throw a bunch of errors because of missing code parts.
*** Bug 56219 has been marked as a duplicate of this bug. ***
@Ruben It will be available in the next update. As a temporary workaround, you can manually add <AndroidEnableMultiDex>true</AndroidEnableMultiDex> (or false) manually wherever <AndroidEnableMultipleDex>true</AndroidEnableMultipleDex> (or false) appears in the csproj file for your Android application. That should fix any issues you may heve
*** Bug 56391 has been marked as a duplicate of this bug. ***
Have verified the bug in 126.96.36.1995 & issues is seems to be fixed.
Environment: Xamarin 188.8.131.525 (70f1268)
Xamarin.Android 184.108.40.206 (bc24645)
Xamarin.iOS 10.10.0.35 (4cffddf)
Have validated below scenario's:
1. Created Android proj & have checked Enable multidex option displayed.
2. Check / Uncheck Mutli-Dex box & have Verified that the csproj file is modified with expected values.
3. Have added the AndroidEnableMultipleDex flag in .csproj file & have validated that nothing gets changed with adding that flag.
4. Have crosscheck with deleting the AndroidEnableMultiDex flag from the file & adding AndroidEnableMultipleDex in that file, Mutli-Dex box checkbox displayed as unchecked.