Hi, I have project in MAC using VS code in NET 8 in MAC. I move it to .NET 9. Can you please give the steps what to do ? Thanks in advance,

Such a question is well beyond what can comfortably fit in a Q&A forum. Have you looked at any of the existing documentation that walks you through this process? If so then please follow those directions or clarify what part of the directions you're struggling with so you can get specific help. Here's some links if you don't have any. MAUI Upgrade from NET 8 to NET 9 MAUI Upgrade (older) NET 9 on macOS Youtube Reddit help

Move from .NET 8 to NET 9 in MAC

Accepted answer

Michael Taylor 56,781 Reputation points

2025-01-22T15:17:29.28+00:00
Such a question is well beyond what can comfortably fit in a Q&A forum. Have you looked at any of the existing documentation that walks you through this process? If so then please follow those directions or clarify what part of the directions you're struggling with so you can get specific help.

Here's some links if you don't have any.

MAUI Upgrade from NET 8 to NET 9

MAUI Upgrade (older)

NET 9 on macOS

Youtube

Reddit help
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1 person found this answer helpful.
Dani_S 4,051 Reputation points

2025-01-22T16:17:03.3566667+00:00

Hi Michel,

I gather the steps and have some questions:

1.Regading this step:"First install .NET 9 and the .NET MAUI workload"

Can I download mac os/arm 64 or x64 from standalone installer and run dotnet workload install maui command in mac ?

Change the Target Framework Monikers (TFMs) from 8 to 9

3.Remove the package reference for the Microsoft.Maui.Controls.Compatibility NuGet package , why ?

4.Update the package reference for the Microsoft.Extensions.Logging.Debug NuGet package to the latest .NET 9 release - do not have it in my cs project what to do ?

5.Update the $(SupportedOSPlatformVersion) build properties for these platforms to 15.0:

Delete the bin and obj

7.XAML compiler error codes have changed their prefix from XFC to XC, so update the $(WarningsAsErrors), $(WarningsNotAsErrors), and $(NoWarn) build properties in your app's project file, if used, to reference the new prefix. - where this location ?

Thanks in advance,

Michael Taylor 56,781 Reputation points

2025-01-22T16:38:45.2866667+00:00

The upgrade instructions say you can use the standalone installer. Install the SDK for the platform that your macOS supports. Note that if you want to use VS Code then I'd recommend that you instead follow the instructions for adding/updating your VSC extension to support MAUI rather than doing this manually yourself. I don't use a Mac so I cannot say what the extension does.

You only need to remove the Compatibility package if you're not using any of the controls that it provides. If you are using some then you may keep using the package.

This is a logging package. If you aren't using it then you don't need to upgrade anything. However it provides support for logging to the debugger so it seems like one you may be indirectly using. If you don't need it though then don't install it.

The properties mentioned are project properties. Open your project file. Then search for these properties. If you find them then look at what errors/warnings are being ignored. Any references to the older MAUI XFC codes should be changed to XC. You may not have any of these. For example

<PropertyGroup> <NoWarn>$(NoWarn);XFC1234;CS5678</NoWarn> </PropertyGroup>

changes to:

<PropertyGroup> <NoWarn>$(NoWarn);XC1234;CS5678</NoWarn> </PropertyGroup>

If you don't have any such entries then there is nothing to change here.

Dani_S 4,051 Reputation points

2025-01-22T16:44:10.9833333+00:00

Regarding 1 with your recommendation: do i need to update my VS code or only the extentions?How do i update the extension? Are these extensions support installing the sdk for my mac?

Michael Taylor 56,781 Reputation points

2025-01-22T17:06:49.73+00:00

VS Code auto-updates as needed. If you go to your Extensions and there is an update it should show it to you and offer to update. In general you should always keep your extensions updated.

Dani_S 4,051 Reputation points

2025-01-22T17:09:19.8+00:00

And what about the sdk,how i install it?

Michael Taylor 56,781 Reputation points

2025-01-22T20:05:00.33+00:00

The standalone installer link that you provided, and that is in the docs, goes directly to the page where the installer for the SDK and runtime are at. Click the SDK installer for your platform to install it.

Bruce (SqlWork.com) 70,686 Reputation points

2025-01-22T20:31:43.27+00:00

After upgrading the sdk to .net 9, you need to update Maui workload. The workload installs the build chain tools

Dani_S 4,051 Reputation points

2025-01-22T20:41:32.1366667+00:00

After install SDK + update Maui workload, do i need to update net Maui extension ?

Michael Taylor 56,781 Reputation points

2025-01-22T20:45:43.0333333+00:00

Yes, update the extension if you haven't already.

Dani_S 4,051 Reputation points

2025-01-22T21:17:34.8266667+00:00

How do i know if my MAC is arm64 or x64?to download the SDK.

Michael Taylor 56,781 Reputation points

2025-01-22T21:25:10.72+00:00

Go to the About This Mac screen and it will tell you which processor you have. Intel-based Macs are x64 while ARM-based Macs are ARM64. If your Mac is newer than 2021 then it is probably ARM64.

Bruce (SqlWork.com) 70,686 Reputation points

2025-01-22T23:34:21.5966667+00:00

the M1/M2/M3/M4 (apple chip) Macs are arm64.

Dani_S 4,051 Reputation points

2025-01-23T12:01:55.83+00:00

i downloaded the sdk above and and run dotnet workload install maui command in mac succesfuly.

After delete bin + obj and clean and rebuild i got this error:

This version of Microsoft.MacCatalyst requires the MacCatalyst 18.2 SDK (shipped with Xcode 16.2). Either upgrade Xcode to get the required header files or set the managed linker behaviour to Link Framework SDKs Only in your project's iOS Build Options > Linker Behavior (to try to avoid the new APIs).

/Users/sasasoftware/.nuget/packages/microsoft.net.illink.tasks/9.0.1/build/Microsoft.NET.ILLink.targets(96,5): error NETSDK1144: Optimizing assemblies for size failed. [/Users/sasasoftware/Desktop/8b82398c-4c31-4ec5-b53f-2b4a2e5c5ba3_archive-net8/MauiApp1/MauiApp1.csproj::TargetFramework=net9.0-maccatalyst]

can you please help?

Dani_S 4,051 Reputation points

2025-01-23T12:29:57.51+00:00

i try to open xcode , but no option to update.

Dani_S 4,051 Reputation points

2025-01-23T12:40:22.3833333+00:00

i try throgh app store also no update option?

Dani_S 4,051 Reputation points

2025-01-23T13:01:55.79+00:00

i tried to remove xcode and install it from scratch but same version 15.4 but need 16.2

how is done ?

Your quick answer will be appreciated .

Michael Taylor 56,781 Reputation points

2025-01-23T15:11:07.8766667+00:00

I don't use a Mac so I cannot answer what to do with XCode. But if I go to their home page there is a link to download it. Perhaps you should do that.

Dani_S 4,051 Reputation points

2025-01-23T15:29:06.9+00:00

No is not. We downlod It through app store.

Dani_S 4,051 Reputation points

2025-01-23T15:40:31.68+00:00

.....

Michael Taylor 56,781 Reputation points

2025-01-23T15:43:15+00:00

A quick search indicates that XCode 16 requires at least MacOS Sonoma 14.5 or higher. Do you have that?

You may need to post in the XCode support channel for getting XCode. We're really focused on just the MS stuff on this forum.

Dani_S 4,051 Reputation points

2025-01-23T19:33:47.0666667+00:00

I have macos sonoma 14.4.1.

Dani_S 4,051 Reputation points

2025-01-23T19:34:38.4366667+00:00

What i need to do?

Michael Taylor 56,781 Reputation points

2025-01-23T19:41:46.9533333+00:00

If your Mac doesn't support XCode 16.1 or higher then you aren't going to be able to use the .NET for iOS tools for NET 9. They are documented as requiring that toolset. There is nothing else that can be done here.

You might consider reaching out to the XCode community to see if there are alternatives for your version but as far as we can help you with here there is nothing else we can do. Your machine doesn't seem to be able to run the necessary Apple tools needed to develop against NET 9.

Given that NET 9 is an STS then you might consider just staying on NET 8, an LTS, for now. There is no reason to upgrade unless you really need features found only in NET 9.

Bruce (SqlWork.com) 70,686 Reputation points

2025-01-23T21:21:22.1366667+00:00

you need to update the O/S

to update to latest Sonoma (14.7.2) from earlier

settings->general->software update

to update to latest macOS (Sequoia - if available for your hardware) go to the App Store and pick "macOS Sequoia".

List of hardware that supports Sequoia:

https://support.apple.com/en-us/120282

Dani_S 4,051 Reputation points

2025-01-24T05:01:20.1033333+00:00

When updsting my sonoma all my poject and vs code will remain ?

Dani_S 4,051 Reputation points

2025-01-28T10:19:30.77+00:00

The problem solved after uninstalling vs code and installing again. it update its pacakes.

We can close the ticket.
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