base on Simple, unambitious mediator implementation in .NET MediatR =======  [](https://www.nuget.org/packages/mediatr) [](https://www.nuget.org/packages/mediatr) [](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<Startup>()); ``` 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<PingPongBehavior>(); cfg.AddStreamBehavior<PingPongStreamBehavior>(); cfg.AddRequestPreProcessor<PingPreProcessor>(); cfg.AddRequestPostProcessor<PingPongPostProcessor>(); cfg.AddOpenBehavior(typeof(GenericBehavior<,>)); }); ``` With additional methods for open generics and overloads for explicit service types. ", Assign "at most 3 tags" to the expected json: {"id":"4741","tags":[]} "only from the tags list I provide: [{"id":77,"name":"3d"},{"id":89,"name":"agent"},{"id":17,"name":"ai"},{"id":54,"name":"algorithm"},{"id":24,"name":"api"},{"id":44,"name":"authentication"},{"id":3,"name":"aws"},{"id":27,"name":"backend"},{"id":60,"name":"benchmark"},{"id":72,"name":"best-practices"},{"id":39,"name":"bitcoin"},{"id":37,"name":"blockchain"},{"id":1,"name":"blog"},{"id":45,"name":"bundler"},{"id":58,"name":"cache"},{"id":21,"name":"chat"},{"id":49,"name":"cicd"},{"id":4,"name":"cli"},{"id":64,"name":"cloud-native"},{"id":48,"name":"cms"},{"id":61,"name":"compiler"},{"id":68,"name":"containerization"},{"id":92,"name":"crm"},{"id":34,"name":"data"},{"id":47,"name":"database"},{"id":8,"name":"declarative-gui "},{"id":9,"name":"deploy-tool"},{"id":53,"name":"desktop-app"},{"id":6,"name":"dev-exp-lib"},{"id":59,"name":"dev-tool"},{"id":13,"name":"ecommerce"},{"id":26,"name":"editor"},{"id":66,"name":"emulator"},{"id":62,"name":"filesystem"},{"id":80,"name":"finance"},{"id":15,"name":"firmware"},{"id":73,"name":"for-fun"},{"id":2,"name":"framework"},{"id":11,"name":"frontend"},{"id":22,"name":"game"},{"id":81,"name":"game-engine "},{"id":23,"name":"graphql"},{"id":84,"name":"gui"},{"id":91,"name":"http"},{"id":5,"name":"http-client"},{"id":51,"name":"iac"},{"id":30,"name":"ide"},{"id":78,"name":"iot"},{"id":40,"name":"json"},{"id":83,"name":"julian"},{"id":38,"name":"k8s"},{"id":31,"name":"language"},{"id":10,"name":"learning-resource"},{"id":33,"name":"lib"},{"id":41,"name":"linter"},{"id":28,"name":"lms"},{"id":16,"name":"logging"},{"id":76,"name":"low-code"},{"id":90,"name":"message-queue"},{"id":42,"name":"mobile-app"},{"id":18,"name":"monitoring"},{"id":36,"name":"networking"},{"id":7,"name":"node-version"},{"id":55,"name":"nosql"},{"id":57,"name":"observability"},{"id":46,"name":"orm"},{"id":52,"name":"os"},{"id":14,"name":"parser"},{"id":74,"name":"react"},{"id":82,"name":"real-time"},{"id":56,"name":"robot"},{"id":65,"name":"runtime"},{"id":32,"name":"sdk"},{"id":71,"name":"search"},{"id":63,"name":"secrets"},{"id":25,"name":"security"},{"id":85,"name":"server"},{"id":86,"name":"serverless"},{"id":70,"name":"storage"},{"id":75,"name":"system-design"},{"id":79,"name":"terminal"},{"id":29,"name":"testing"},{"id":12,"name":"ui"},{"id":50,"name":"ux"},{"id":88,"name":"video"},{"id":20,"name":"web-app"},{"id":35,"name":"web-server"},{"id":43,"name":"webassembly"},{"id":69,"name":"workflow"},{"id":87,"name":"yaml"}]" returns me the "expected json"