MediatR 12.0 Released

This is a pretty big release, with a number of breaking changes.

• Release Notes
• Migration Guide

Breaking changes include:

• Depending directly on IServiceProvider to resolve services
• Making "void" request handlers return Task instead of Unit
• IRequest does not inherit IRequest<Unit> instead IBaseRequest
• Consolidating the MediatR.Extensions.Microsoft.DependencyInjection package into the main MediatR package
• Rolling back stricter generic constraints in various behavior interfaces
• Various behavior registrations now inside of the IServiceCollection extension
• Overloads of AddMediatR consolidated into single configuration object

The migration guide includes instructions for upgrading. In addition, this release adds some new functionality, including:

• Targeting netstandard2.0 instead of netstandard2.1
• Adding custom notification publisher strategies (for parallel vs. sequential execution, for example).

Enjoy! Or not? Either way, it's out.