Question

我希望得到一些关于如何为某些特定合同和实现注册装饰器的反馈。这就是我所拥有的

像这样的标记查询界面

public interface IQueryBase
{

}

像这样的查询处理程序合同

   public interface IQueryHandlerNew<TQuery, TResult>
  where TQuery : IQueryBase
{
    TResult Handle(TQuery request);
    Task<TResult> HandleAsync(TQuery request);
}

像这样的实际查询

public sealed class FindCitiesByCountryIdQuery : IQueryBase
{
    public int PageNumber { get; set; }
    public int CountryId { get; set; }
    public int PageSize { get; set; }
}


public class CityReadModel
{
    public int CityId { get; set; }
    public string CityName { get; set; }
}

最后查询处理程序就像这样

   public class FindCitiesByCountryIdQueryHandler : IQueryHandlerNew<FindCitiesByCountryIdQuery, CityReadModel[]>
{
    public CityReadModel[] Handle(FindCitiesByCountryIdQuery request)
    {
        throw new NotImplementedException();
    }

    public Task<CityReadModel[]> HandleAsync(FindCitiesByCountryIdQuery request)
    {
        throw new NotImplementedException();
    }
}

这是queryhandlers的loggingdecorator

 public class QueryHandlerLogginDecorator2<TQuery, TResult> : IQueryHandlerNew<TQuery, TResult> where TQuery : IQueryBase
{
    private readonly IQueryHandlerNew<TQuery, TResult> _decoratee;
    private readonly ICustomLogger _logger;

    public QueryHandlerLogginDecorator2(IQueryHandlerNew<TQuery, TResult> decoratee, ICustomLogger logger)
    {
        _decoratee = decoratee;
        _logger = logger;
    }

    public TResult Handle(TQuery request)
    {
        try
        {
            //Log request information here 
            return _decoratee.Handle(request);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, string.Format(LogConstants.ErrorLogFormat, DateTime.UtcNow, GetType(), ex.Message));
            throw;
        }
    }

    public Task<TResult> HandleAsync(TQuery request)
    {
        try
        {
            //Log request information here 
            return _decoratee.HandleAsync(request);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, string.Format(LogConstants.ErrorLogFormat, DateTime.UtcNow, GetType(), ex.Message));
            throw;
        }
    }
}

当我尝试使用像这样的简单注入器寄存器装饰器注册此设置时

container.RegisterDecorator(typeof(IQueryHandlerNew<>), typeof(QueryHandlerLogginDecorator2<>), Lifestyle.Transient);

它失败并说“使用IQueryHandlerNew需要2个类型参数”

我使用类似的设置来注册具有1个类型参数的装饰器（例如对于存储库）并且它注册得很好。

不确定我在这里做错了什么。 simpleinjector和使用多于1个类型参数注册装饰器是否存在已知限制？

非常感谢任何反馈

提前致谢

简单注射器 - 使用开放式泛型注册装饰器

0 个答案: