我有一个类和通用接口，在尝试注入错误时会发生：
System.ArgumentException：'无法实例化实现类型
'Application.Process.ProcessIntegrationUseCase.GenericClass.HandlerManager 1[T]' for service type 'Application.Process.ProcessIntegrationUseCase.GenericClass.IHandlerManager 1 [T]'。”
namespace Application.Process.ProcessIntegrationUseCase.GenericClass
{
public abstract class HandlerManager<T>: IHandlerManager<T>
{
protected IHandlerManager<T> sucessor;
public void SetSucessor(IHandlerManager<T> sucessor)
{
this.sucessor = sucessor;
}
public abstract void ProcessRequest(T request);
}
}
接口IHandlerManager
namespace Application.Process.ProcessIntegrationUseCase.GenericClass
{
public interface IHandlerManager<T>
{
void SetSucessor(IHandlerManager<T> sucessor);
void ProcessRequest(T request);
}
}
脱脂注射
public void Register(IServiceCollection services)
{
// Injection History Use Cases Application
services.AddTransient(typeof(IHandlerManager<>),
typeof(HandlerManager<>));
}
调用注入HandlerManager的代码
using Domain.Meta;
using System;
using Microsoft.Extensions.Logging;
using Application.Process.ProcessIntegrationUseCase.GenericClass;
namespace Application.UseCases.Process.ProcessIntegrationUseCase.Habitacional
{
public sealed class ProcessHabitacionalUseCase : IProcessHabitacionalUseCase
{
private readonly StartProcessHandler<HistoryHabitacional> _startProcessHandler;
private readonly ILogger _iLogger;
public ProcessHabitacionalUseCase(ILogger iLogger,
StartProcessHandler<HistoryHabitacional> startProcessHandler)
{
_iLogger = iLogger;
_startProcessHandler = startProcessHandler;
}
public void Execute(HistoryHabitacional history)
{
if (history == null)
throw new ArgumentNullException();
try
{
_startProcessHandler.ProcessRequest(history);
}
catch (Exception ex)
{
throw ex;
}
}
}
}
覆盖HandlerManager中的方法的类
using System;
using System.Reflection;
using Microsoft.Extensions.Logging;
using Application.Repositories.History;
using Application.Repositories.I4Pro;
using Domain.Process.Enum;
namespace Application.Process.ProcessIntegrationUseCase.GenericClass
{
public class StartProcessHandler<T> : HandlerManager<T> where T: class
{
private readonly ILogger _iLogger;
private readonly IHistoryReadOnlyRepository _historyReadOnlyRepository;
private readonly II4ProReadOnlyRepository _i4ProReadOnlyRepository;
public StartProcessHandler(ILogger iLogger,
IHistoryReadOnlyRepository historyReadOnlyRepository,
II4ProReadOnlyRepository i4ProReadOnlyRepository)
{
_iLogger = iLogger;
_historyReadOnlyRepository = historyReadOnlyRepository;
_i4ProReadOnlyRepository = i4ProReadOnlyRepository;
}
public override void ProcessRequest(T history)
{
try
{
TypeIntegration typeIntegration = (TypeIntegration)history.GetType().GetProperty("TypeIntegration").GetValue(history);
_iLogger.LogInformation("Buscando execuções MetaIntegra");
var item = _historyReadOnlyRepository.GetLastHistory(typeIntegration);
_iLogger.LogInformation("Buscando execuções I4Pro");
var i4Process = _i4ProReadOnlyRepository.ListLastExecutions();
_iLogger.LogInformation("Executing Habitacional Integration_" + DateTime.Now.ToString());
if ((item != null && i4Process[0].Id_Processo_Log != item.LastIdI4Pro) || item == null)
{
history.GetType().GetProperty("LastIdI4Pro").SetValue(history,
item.LastIdI4Pro);
history.GetType().GetProperty("IdProcessoLog").SetValue(history,
i4Process[0].Id_Processo_Log);
if (base.sucessor != null)
sucessor.ProcessRequest(history);
}
}
catch (Exception ex)
{
_iLogger.LogError(ex.Message);
}
}
}
}
最佳答案
您不能使用这种通用类型。 AddTransient()期望可以将指定的第二种类型的实例分配给对第一种类型的引用。通用HandlerManager<>不可分配给IHandlerManager<>；您需要指定隐式类型，并以一致的方式进行操作。
另外，HandlerManager<T>是抽象的，您不能创建它的实例。