System.IO

This assembly no longer contains any code. It is provided only to permit type unification for libraries built against previous versions of .NET.

Source

• All types previously part of this assembly (Stream, BinaryReader, MemoryStream, StreamReader, TextWriter, etc.) are now part of System.Private.CoreLib, exposed via System.Runtime.

• Most of the tests for types previously in this library are still in the tests subdirectory.

Contribution Bar

• We consider changes that add value to the tests.

Deployment

The System.IO assembly is part of the shared framework, and ships with every new release of .NET.