Migrating from Xamarin.Forms to .NET MAUI

In this document you will learn that:

• you do NOT need to rewrite your Xamarin.Forms application
• you WILL need to make a few code changes
• you CAN use "single project" features without merging all your projects into one
• you SHOULD wait to migrate production applications

The Migration Vision

When we release migration guides later in 2021, we expect your steps will look something like this:

1. Run .NET Upgrade Assistant for .NET MAUI to migrate your csproj to SDK Style, and perform well-known code migration (namespaces, name changes)
2. Update dependencies to .NET 6 and .NET MAUI compatible versions
3. Register any compatibility services or renderers
4. Build and fix any issues
5. Run the converted app and verify

Porting Samples Today

As we validate our progress, we are porting Xamarin.Forms sample code and projects by hand. Below is a typical process.

Samples are almost always pure Xamarin.Forms code and have little or no custom renderers, so a new project is easiest to start with.

Let's migrate Button Demos

> dotnet new maui -n ButtonDemos

This creates a blank, multi-targeted project.

> cd ButtonDemos
> dotnet restore

If you are unable to restore, check the Getting Started guide and make sure you have the required NuGet sources.

Now copy the code files (except App.xaml) into your project.

Open the folder in your favorite code editor, and do a Find and Replace for the namespaces.

• using Xamarin.Forms » using Microsoft.Maui and using Microsoft.Maui.Controls
• using Xamarin.Forms.Xaml » using Microsoft.Maui.Controls.Xaml
• xmlns="http://xamarin.com/schemas/2014/forms" » xmlns="http://schemas.microsoft.com/dotnet/2021/maui"

Disable the compatibility renderers in Startup.cs by passing false to UseFormsCompatibility. This ensures we will be using the .NET MAUI Button.

Make sure you have an emulator, simulator, or device up and running. Follow the instructions in Getting Started to run for a specific platform. Let's run on Android:

> dotnet build -t:Run -f net6.0-android

Look for runtime errors. Some errors will be due to incomplete handler availability (see the Status Report).

Please report any issues you discover.