Important We strongly discourage the use of portable class libraries in new application development, because they target only a very specific subset of .NET implementations. If you're building a reusable library to share code between .NET Framework and other .NET implementations, the recommended replacement is a .NET Standard 2.0 library. Otherwise, use .NET 5 or later. For more information, see .
![Cross-Platform Development with the Portable Class Library](https://cdn-ak-scissors.b.st-hatena.com/image/square/d6e4cb632c7025e9f5e05fd314fbf6dcd6144e8d/height=288;version=1;width=512/https%3A%2F%2Flearn.microsoft.com%2Fen-us%2Fmedia%2Fopen-graph-image.png)