nosratifarhad / Mediator

Separating commands and queries in User Mediator In .Net 6

Mediator

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 Mediator.SourceGenerator 

NuGet\Install-Package Mediator.Abstractions 

You only need to set two fields of its options, time to add MediatorServices on project in Startup.cs file

Set "Namespace" and Set "ServiceLifetime"

services.AddMediator(options =>
{
    options.Namespace = "WebApplicationMediator";
    options.ServiceLifetime = ServiceLifetime.Transient;
});

the Final level for use "Mediator" :

• Go To Application Folder (Layer) And Create Command Or Query and Use down Code in Application Layer .
• You Should Use "ICommand" for Command
• Use "IQuery" for Query Requests , like this :

Sample Command And CommandHandler

// Use ICommand In Command Model
public class CreateProductCommand : ICommand
{
    public string ProductName { get; set; }
}
#region Handle
// Use ICommandHandler In Command Handler

public async ValueTask<Unit> Handle(CreateProductCommand request, CancellationToken cancellationToken)
{
   var createProduct = GenereateCreateProductDtoFromaCommand(request);

   await _productRepository.CreateProduct(createProduct,cancellationToken).ConfigureAwait(false);

   return Unit.Value;
}
#endregion

#region Private

private Product GenereateCreateProductFromaCommand(CreateProductCommand command)
   => new Product(command.ProductName);

#endregion Private

Sample Query And QueryHandler

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

#region Handle
// Use IQueryHandler In Query Handler

public async ValueTask<IEnumerable<ProductVM>> Handle(GetProductQuery request, CancellationToken cancellationToken)
{
   var products = await _productService.GetProduct(cancellationToken).ConfigureAwait(false);

   var productVMs = CreateProductVM(products);

   return productVMs;
}

#endregion

#region Private

private IEnumerable<ProductVM> CreateProductVM(IEnumerable<Product> products)
{
  ICollection<ProductVM> productVMs = new List<ProductVM>();

  foreach (var product in products)
      productVMs.Add(new ProductVM()
      {
          Id = product.Id,
          Name = product.Name,
      });

  return productVMs;
}

#endregion Private