Tag: Dependency Injection

Posted on

How to mock IConfiguration

var configuration = new Mock<IConfiguration>();
 
var configurationSection = new Mock<IConfigurationSection>();
configurationSection.Setup(a => a.Value).Returns("testvalue");
 
configuration.Setup(a => a.GetSection("TestValueKey")).Returns(configurationSection.Object);

Source

Posted on

Dependency Injection With Multiple Implementations Of The Same Interface

public void ConfigureServices(IServiceCollection services)
{
  services.AddTransient<AddOperationRepository>();
  services.AddTransient<SubtractOperationRepository>();
  services.AddTransient<MultiplyOperationRepository>();
  services.AddTransient<DivideOperationRepository>();
  services.AddTransient<Func<MathOperationType, IMathOperationRepository>>(serviceProvider => key =>
  {
    switch (key)
    {
      case MathOperationType.Add:
        return serviceProvider.GetService<AddOperationRepository>();
      case MathOperationType.Subtract:
        return serviceProvider.GetService<SubtractOperationRepository>();
      case MathOperationType.Multiply:
        return serviceProvider.GetService<MultiplyOperationRepository>();
      case MathOperationType.Divide:
        return serviceProvider.GetService<DivideOperationRepository>();
      default:
        throw new KeyNotFoundException();
    }
  });
  . . .
}

...
public class ValuesController : ControllerBase  
{  
  private Func<MathOperationType, IMathOperationRepository> _mathRepositoryDelegate;  
  public ValuesController(Func<MathOperationType, IMathOperationRepository> mathRepositoryDelegate)  
  {  
    _mathRepositoryDelegate = mathRepositoryDelegate;  
  }  
  [HttpPost]  
  public ActionResult<OperationResult> Post([FromBody] OperationRequest opRequest)  
  {  
    IMathOperationRepository mathRepository = _mathRepositoryDelegate(opRequest.OperationType);  
    OperationResult opResult = mathRepository.PerformOperation(opRequest);  
    return new ObjectResult(opResult);  
  }  
}

Source:
https://www.c-sharpcorner.com/article/dependency-injection-with-multiple-implementations-of-the-same-interface/