Introduction

All Xamarin developers, please welcome Net standard 2.0. This is the kind of class library we were waiting for all these years. The .Net standard 2.0 specification is now complete and it is included with Net core 2.0, Net framework 4.6.1 and up to latest versions. It can be used using Visual Studio versions 15.3 and up. Net Standard 2.0 obviously supports C# and also F# and Visual Basic.

More APIs

Net Standard 2.0 is for sharing code via various platforms. It is included with all the common APIs that all .Net implementations, it unified all .net frameworks to avoid any fragmentations in future. There are more than 32000 APIs in .Net Standard 2.0 most of them that are already available in .Net Framework APIs. Microsoft has made it easy to port existing code to .Net Standard 2.0. It is now easy to extend any .Net Standard to .Net core 2.0 or any versions that come in future.

NuGet Support

Most NuGet packages currently work well with .Net framework, but not all projects are compatible to move to .Net Standard 2.0, therefore a compatibility mode is added to support them.  Even after compatibility mode, only upt0 70% of packages are supported.

Frameworks and Libraries

Below is the table,list all the support frameworks and libraries. Click here for more details

.NET Standard
1.0 1.1 1.2 1.3 1.4 1.5 1.6 2.0
.NET Core 1.0 1.0 1.0 1.0 1.0 1.0 1.0 2.0
.NET Framework 4.5 4.5 4.5.1 4.6 4.6.1 4.6.1 4.6.2 4.6.1 vNext 4.6.1
Mono 4.6 4.6 4.6 4.6 4.6 4.6 4.6 5.4
Xamarin.iOS 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.14
Xamarin.Mac 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.8
Xamarin.Android 7.0 7.0 7.0 7.0 7.0 7.0 7.0 8.0
Universal Windows Platform 10.0 10.0 10.0 10.0 10.0 10.0.16299 10.0.16299 10.0.16299
Windows 8.0 8.0 8.1
Windows Phone 8.1 8.1 8.1
Windows Phone Silverlight 8.0

Sample to convert PCL or Shared to .Net Standard 2.0

  1. Create a default PCL or Shared based Xamarin Forms applications and name it appropreately and wait for solution to loadScreen Shot 2017-12-09 at 09.18.05
  2. Add .Net Standard class library by selecting .Net Standard 2.0Screen Shot 2017-12-09 at 09.24.38Screen Shot 2017-12-09 at 09.25.41Now project should look something like belowScreen Shot 2017-12-09 at 09.26.38.png
  3. Now remove PCL or Shared based project (VERY Important only after moving all the required project files to Netstandard20Test library) and compileScreen Shot 2017-12-09 at 09.28.38.png
  4. now rename the NetStandard20Test to NetStandardTest (Same as deleted library), make sure to rename DefaultNameSpace and Assembly to NetStandarTestScreen Shot 2017-12-09 at 09.30.07Screen Shot 2017-12-09 at 09.30.14Screen Shot 2017-12-09 at 09.30.24Screen Shot 2017-12-09 at 09.30.44Screen Shot 2017-12-09 at 09.34.23.png
  5. Now build the project and see if build is successfully.
  6. Your build should fail with errors as shown below, it is because of the deleted project, now we have to reference back the newly created .Net Standard 2.0 to both Android and iOSScreen Shot 2017-12-09 at 09.35.53.png
  7. Now edit references on each platform project to add newly created project as shown below onceScreen Shot 2017-12-09 at 09.37.58Screen Shot 2017-12-09 at 09.38.05
  8. references are applied correctly, you should get below errorsScreen Shot 2017-12-09 at 09.52.14
  9. Now add Xamarin.Forms NuGet package for all projectsScreen Shot 2017-12-09 at 09.54.04.png
  10. Now build the project and you should see any errorsScreen Shot 2017-12-09 at 10.58.06
  11. Microsoft has also released a compatibility NuGet package that makes sure’s all the existing packages are compatible to .Net Standard 2.0
  12. Add NuGet package, Mirosoft.NETCore.Portable.Compatibility to .Net Standard 2.0 project.Screen Shot 2017-12-09 at 11.03.01

Hope this blog is useful to you.

 

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