Xamarin forms to MAUI migration issues

Question

Xamarin forms to MAUI migration issues

Sakshi Poojary 95

I have tried to migrate my Xamarin Forms app to MAUI using .NET 7 using the upgrade assistant extension in visual studio. First I migrated the solution, then android and finally the iOS projects. (Is this workflow correct?)

After that I have deleted the bin and obj folders, clean the project and done Rebuild.

But I am getting below errors when rebuilding the project.

Severity Code Description Project File Line Suppression State Error NU1012 Platform version is not present for one or more target frameworks, even though they have specified a platform: net7.0-android MyProject.Android E:\My Projects\Xamarin.Net7\MyProject-app\MyProject\MyProject.Android\MyProject.Android.csproj 1

Severity Code Description Project File Line Suppression State Error NETSDK1139 The target platform identifier android was not recognized. MyProject C:\Program Files\dotnet\sdk\7.0.400\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.TargetFrameworkInference.targets 113

Severity Code Description Project File Line Suppression State Error NETSDK1139 The target platform identifier ios was not recognized. MyProject C:\Program Files\dotnet\sdk\7.0.400\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.TargetFrameworkInference.targets 113

I found a similar thread here for the first issue and found a similar thread here for the 2nd and 3rd issues. But I didn't get a clear picture of what fix need to do?

I also tried the migration with .NET 8 and getting same above errors. My project is already available on stores. So if we create a new MAUI project and move all the files into it, is it approve by the stores?

Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 50,126 Reputation points Microsoft External Staff

2023-08-17T03:04:43.17+00:00
Have you tried the latest version of the migration tool and migration tutorial released by dotnet?

Please refer to the following documentations:

Announcing a new version of the .NET Upgrade Assistant with support for .NET MAUI and Azure Functions!

Bootstrap your migrated app.

Sakshi Poojary 95

@Yonglun Liu (Shanghai Wicresoft Co,.Ltd.)

I have updated the upgrade assistant to the latest and upgraded the project with that. At that time also I am getting the same errors and one new error like below:

Severity	Code	Description	Project	File	Line	Suppression State
Error	NU1201	Project MyProject is not compatible with net7.0 (.NETCoreApp,Version=v7.0). Project MyProject supports:
  - net7.0-android (.NETCoreApp,Version=v7.0)
  - net7.0-ios (.NETCoreApp,Version=v7.0)
  - net7.0-windows10.0.19041 (.NETCoreApp,Version=v7.0)	MyProject.iOS	E:\My Projects\Xamarin\Latest Upgrade Assitent\MyProject-app\CallerBee\MyProject.iOS\MyProject.iOS.csproj	1

First I migrated the solution, then android and finally the iOS projects. Is this workflow correct?

Sakshi Poojary 95 Reputation points

2023-08-17T13:55:24.51+00:00

@Yonglun Liu (Shanghai Wicresoft Co,.Ltd.)

I found a new change in the upgradation steps.

After updating the upgrade assistant to latest, I right click on the solution and tapped Upgrade. Then a new screen appear like below:

I chose the first option(Upgrade project to a newer .NET version) and chose in place project upgrade. Then choose .NET7 and started migration. Same steps I did for Android upgradation.

But for iOS after choosing the in place project upgrade, no framework are listing on next page. So I choose Upgrade project features from first screen and Convert project to SDK style. After that the .NET lists are showing and completed the upgradation.

So my doubt is before upgrading Do I need to Convert project to SDK style?

I feel some of the issues are happening due to some kind of cache. Do I need to clear any kind of folders like bin and obj? Other than bin and obj, do I need to delete any other cache folders for the proper working of the application?
Marco Goertz [MSFT] 0 Reputation points Microsoft Employee

2023-08-18T16:05:35.83+00:00

@Sakshi Poojary The Upgrade Assistant does convert your Xamarin projects to SDK-style automatically when upgrading to .NET MAUI. Running the Upgrade Assistant again on a converted project isn't a scenario we have been focusing on. so the results may not be useful.
I would suggest you send a mail to maui-upgrades@microsoft.com about this problem for a faster communication channel. It would be helpful to see the contents of the converted project files, your VS version, as well as the output of dotnet --info and dotnet workload list when run from a command prompt in your solution directory.

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Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 50,126 Reputation points Microsoft External Staff

2023-08-17T03:04:43.17+00:00

Have you tried the latest version of the migration tool and migration tutorial released by dotnet?

Please refer to the following documentations:

Announcing a new version of the .NET Upgrade Assistant with support for .NET MAUI and Azure Functions!

Bootstrap your migrated app.
Sakshi Poojary 95 Reputation points

2023-08-17T10:51:06.9533333+00:00

@Yonglun Liu (Shanghai Wicresoft Co,.Ltd.)

I have updated the upgrade assistant to the latest and upgraded the project with that. At that time also I am getting the same errors and one new error like below:

Severity Code Description Project File Line Suppression State Error NU1201 Project MyProject is not compatible with net7.0 (.NETCoreApp,Version=v7.0). Project MyProject supports: - net7.0-android (.NETCoreApp,Version=v7.0) - net7.0-ios (.NETCoreApp,Version=v7.0) - net7.0-windows10.0.19041 (.NETCoreApp,Version=v7.0) MyProject.iOS E:\My Projects\Xamarin\Latest Upgrade Assitent\MyProject-app\CallerBee\MyProject.iOS\MyProject.iOS.csproj 1

First I migrated the solution, then android and finally the iOS projects. Is this workflow correct?
Sakshi Poojary 95 Reputation points

2023-08-17T13:55:24.51+00:00

@Yonglun Liu (Shanghai Wicresoft Co,.Ltd.)

I found a new change in the upgradation steps.

After updating the upgrade assistant to latest, I right click on the solution and tapped Upgrade. Then a new screen appear like below:

I chose the first option(Upgrade project to a newer .NET version) and chose in place project upgrade. Then choose .NET7 and started migration. Same steps I did for Android upgradation.

But for iOS after choosing the in place project upgrade, no framework are listing on next page. So I choose Upgrade project features from first screen and Convert project to SDK style. After that the .NET lists are showing and completed the upgradation.

So my doubt is before upgrading Do I need to Convert project to SDK style?

I feel some of the issues are happening due to some kind of cache. Do I need to clear any kind of folders like bin and obj? Other than bin and obj, do I need to delete any other cache folders for the proper working of the application?
Marco Goertz [MSFT] 0 Reputation points Microsoft Employee

2023-08-18T16:05:35.83+00:00

@Sakshi Poojary The Upgrade Assistant does convert your Xamarin projects to SDK-style automatically when upgrading to .NET MAUI. Running the Upgrade Assistant again on a converted project isn't a scenario we have been focusing on. so the results may not be useful.
I would suggest you send a mail to maui-upgrades@microsoft.com about this problem for a faster communication channel. It would be helpful to see the contents of the converted project files, your VS version, as well as the output of dotnet --info and dotnet workload list when run from a command prompt in your solution directory.

Answer 1

Hello,

After testing, xamarin.ios projects that cannot find the target framework after upgrading using the latest upgrade assistant will have the problem of not finding the target framework.

So my doubt is before upgrading Do I need to Convert project to SDK style? I feel some of the issues are happening due to some kind of cache. Do I need to clear any kind of folders like bin and obj? Other than bin and obj, do I need to delete any other cache folders for the proper working of the application?

You need to change the SDK style, and the issue is not caused by cache. Upgrade Assistant does not complete all the migration work, you need to refer to the following documents to complete the manual migration.

Run .NET Upgrade Assistant for .NET MAUI to migrate your csproj to SDK Style, and perform well-known code migration (namespaces, name changes)

Manually upgrade a Xamarin.Forms app to .NET MAUI.

Alternatively, you can refer to the following wiki to migrate the code in Xamairn to a newly created MAUI project.

Migrating from Xamarin.Forms to .NET MAUI.

Best Regards,

Alec Liu.

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Sakshi Poojary 95 Reputation points

2023-08-18T05:43:37.7466667+00:00

@Yonglun Liu (Shanghai Wicresoft Co,.Ltd.)

I am getting same errors when I try with .NET6, .NET7 and .NET8. Before working on my real project I work on a demo project. I upgraded that demo Xamarin Forms project to MAUI and it was successful. But now when I open the same demo project, it is showing the same errors that I am facing on the real project. So that's why I believe there should be some kind of cache issue.

I have uploaded my demo project here.

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Xamarin forms to MAUI migration issues

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