To Start with create a new Xamarin forms app that uses a Portable Class Library
Since UWP will nor support .net Standard Libraries for a few months I would press cancel if you get the dialog asking what version of UWP you want to support.
Right click on the solution and select add new project. Add a class library (.net standard)
Now drag the files App.Xaml and MainPage.Xaml from the PCL to the new class library. You can also delete the file Class1.cs in the standard library we created.
Open the properties for the Standard class library and change the default namespace to be the same as the portable class libraries
Time to add a NuGet package to the standard class library. Microsoft.NetCore.Portability.Compatibility. This will help prevent some build errors
Remove the portable class library from the solution. Right click on the solution and select mange NuGet packages for the solution. Select Updates and find Xamarin Forms. Select the latest pre release and make sure the standard library is checked. The latest prerelease supports standard libraries
Right click on the standard class library and select edit csproj. Remove the following lines from the file.
Save the file and add a reference in the android and ios project to the new standard library
Now you can run it
Here is what it looks like in the android emulator
In the next post in this series we will call a web service and save the json we get back to a file on the device.