MediatR

More details about the architecture .

• 1 - Application Folder is Application Layer
  • In This Layer , Have Command And Queries And Handlers .
• 2 - Service Folder is Service Layer
  • For Data Persistence And Use ORM (Entity FrameWork).

first You need to install the following packages :

NuGet\Install-Package MediatR.Extensions.Microsoft.DependencyInjection 

You must pass the "Assembly" when adding the MediatR service to project , like this

//services.AddMediatR(Assembly.GetExecutingAssembly());
services.AddMediatR(typeof(Program).Assembly);

And the Final level for use "MediatR" :

• Go To Application Folder (Layer) And Create Command Or Query and Use down Code in Application Layer .
• You should use "IRequest" for command and query requests , like this :

Sample Command And CommandHandler

// Use IRequest In Command Model
public class CreateProductCommand : IRequest
{
  public string ProductTitle { get; set; }

  public string ProductName { get; set; }
}
    
// Use IRequestHandler In Command Handler
public class CreateProductCommandHandler : IRequestHandler<CreateProductCommand>
{
   public async Task<Unit> Handle(CreateProductCommand request, CancellationToken cancellationToken)
   {
      var createProductDto = GenereateCreateProductDtoFromaCommand(request);

      await _productService.CreateProduct(createProductDto).ConfigureAwait(false);

      return Unit.Value;
   }
}

Sample Query And QueryHandler

// Use IRequest In Query Model 
public class GetProductQuery : IRequest<IEnumerable<ProductVM>>
{
  public int ProductId { get; set; }
}

// Use IRequest In Query Handler
public class GetProductQueryHandler : IRequestHandler<GetProductQuery, IEnumerable<ProductVM>>
{
     public async Task<IEnumerable<ProductVM>> Handle(GetProductQuery request, CancellationToken cancellationToken)
     {
         var productVMList = await _productService.GetProduct().ConfigureAwait(false);

         return productVMList;
     }
}