https://github.com/jbogard/mediatr

Simple, unambitious mediator implementation in .NET
https://github.com/jbogard/mediatr

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Simple, unambitious mediator implementation in .NET

• Host: GitHub
• URL: https://github.com/jbogard/mediatr
• Owner: jbogard
• License: apache-2.0
• Created: 2014-03-03T15:01:22.000Z (over 10 years ago)
• Default Branch: master
• Last Pushed: 2024-09-11T18:39:03.000Z (2 months ago)
• Last Synced: 2024-10-15T13:05:39.383Z (29 days ago)
• Topics: hacktoberfest
• Language: C#
• Homepage:
• Size: 5.7 MB
• Stars: 11,080
• Watchers: 291
• Forks: 1,173
• Open Issues: 13
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
MediatR

=======

![CI](https://github.com/jbogard/MediatR/workflows/CI/badge.svg)

[![NuGet](https://img.shields.io/nuget/dt/mediatr.svg)](https://www.nuget.org/packages/mediatr) 

[![NuGet](https://img.shields.io/nuget/vpre/mediatr.svg)](https://www.nuget.org/packages/mediatr)

[![MyGet (dev)](https://img.shields.io/myget/mediatr-ci/v/MediatR.svg)](https://myget.org/gallery/mediatr-ci)

Simple mediator implementation in .NET

In-process messaging with no dependencies.

Supports request/response, commands, queries, notifications and events, synchronous and async with intelligent dispatching via C# generic variance.

Examples in the [wiki](https://github.com/jbogard/MediatR/wiki).

### Installing MediatR

You should install [MediatR with NuGet](https://www.nuget.org/packages/MediatR):

    Install-Package MediatR

    

Or via the .NET Core command line interface:

    dotnet add package MediatR

Either commands, from Package Manager Console or .NET Core CLI, will download and install MediatR and all required dependencies.

### Using Contracts-Only Package

To reference only the contracts for MediatR, which includes:

- `IRequest` (including generic variants)

- `INotification`

- `IStreamRequest`

Add a package reference to [MediatR.Contracts](https://www.nuget.org/packages/MediatR.Contracts)

This package is useful in scenarios where your MediatR contracts are in a separate assembly/project from handlers. Example scenarios include:

- API contracts

- GRPC contracts

- Blazor

### Registering with `IServiceCollection`

MediatR supports `Microsoft.Extensions.DependencyInjection.Abstractions` directly. To register various MediatR services and handlers:

```

services.AddMediatR(cfg => cfg.RegisterServicesFromAssemblyContaining());

```

or with an assembly:

```

services.AddMediatR(cfg => cfg.RegisterServicesFromAssembly(typeof(Startup).Assembly));

```

This registers:

- `IMediator` as transient

- `ISender` as transient

- `IPublisher` as transient

- `IRequestHandler<,>` concrete implementations as transient

- `IRequestHandler<>` concrete implementations as transient

- `INotificationHandler<>` concrete implementations as transient

- `IStreamRequestHandler<>` concrete implementations as transient

- `IRequestExceptionHandler<,,>` concrete implementations as transient

- `IRequestExceptionAction<,>)` concrete implementations as transient

This also registers open generic implementations for:

- `INotificationHandler<>`

- `IRequestExceptionHandler<,,>`

- `IRequestExceptionAction<,>`

To register behaviors, stream behaviors, pre/post processors:

```csharp

services.AddMediatR(cfg => {

    cfg.RegisterServicesFromAssembly(typeof(Startup).Assembly);

    cfg.AddBehavior();

    cfg.AddStreamBehavior();

    cfg.AddRequestPreProcessor();

    cfg.AddRequestPostProcessor();

    cfg.AddOpenBehavior(typeof(GenericBehavior<,>));

    });

```

With additional methods for open generics and overloads for explicit service types.