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Chapter 3. Migrating to .NET Core 2.1
This chapter provides migration information for .NET Core 2.1.
3.1. Migrating from previous versions of .NET Core
Microsoft provides instructions for migrating from most previous versions of .NET Core. When migrating, the following ASP.NET Core 2.0 property should no longer be specified. It should remain the default value for .NET Core 2.1. Make sure to remove this property from the project file and command line, if it is being specified there.
<PublishWithAspNetCoreTargetManifest>false</PublishWithAspNetCoreTargetManifest>
See the following Microsoft articles to migrate from previous versions of .NET Core.
If migrating from .NET Core 1.x to 2.0, see the first few related sections in Migrate from ASP.NET Core 1.x to 2.0. These sections provide guidance that is appropriate for a .NET Core 1.x to 2.0 migration path.
3.2. Migrating from .NET Framework to .NET Core 2.1
Review the following information to migrate from the .NET Framework.
3.2.1. Migration considerations
Several technologies and APIs present in the .NET Framework are not available in .NET Core. If your application or library requires these APIs, consider finding alternatives or continue using the .NET Framework. .NET Core does not support the following technologies and APIs.
- Desktop applications, for example, Windows Forms and Windows Presentation Foundation (WPF)
- Windows Communication Foundation (WCF) servers (WCF clients are supported)
- .NET remoting
Additionally, a number of .NET APIs can only be used in Microsoft Windows environments. The following list shows a few examples of these Windows-specific APIs.
- Microsoft.Win32.Registry
- System.AppDomains
- System.Drawing
- System.Security.Principal.Windows
Consider using the .NET Portability Analyzer to identify API gaps and potential replacements. For example, enter the following command to find out how much of the API used by your .NET Framework 4.6 application is supported by .NET Core 2.1.
dotnet /path/to/ApiPort.dll analyze -f . -r html --target '.NET Framework,Version=4.6' --target '.NET Core,Version=2.1'
$ dotnet /path/to/ApiPort.dll analyze -f . -r html --target '.NET Framework,Version=4.6' --target '.NET Core,Version=2.1'Several APIs that are not supported in the out-of-the-box version of .NET Core may be available from the Microsoft.Windows.Compatibility nuget package. Be careful when using this nuget package. Some of the APIs provided (such as Microsoft.Win32.Registry) only work on Windows, making your application incompatible with Red Hat Enterprise Linux.
3.2.2. .NET Framework migration articles
Refer to the following Microsoft articles when migrating from .NET Framework.
- For general guidelines, see Porting to .NET Core from .NET Framework.
- For porting libraries, see Porting to .NET Core - Libraries.
- For migrating to ASP.NET Core, see Migrating to ASP.NET Core.
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