我的应用程序中有一个稍微修改过的
Mediatr处理命令处理版本.我已经实现了一个MediatorPipeline,允许我有前后处理器.
public class AsyncMediatorPipeline<TRequest, TResponse>
: IAsyncRequestHandler<TRequest, TResponse>
where TRequest : IAsyncRequest<TResponse>
{
private readonly IAsyncRequestHandler<TRequest, TResponse> inner;
private readonly IAsyncPreRequestHandler<TRequest>[] preRequestHandlers;
private readonly IAsyncPostRequestHandler<TRequest,TResponse>[] postRequestHandlers;
public AsyncMediatorPipeline(IAsyncRequestHandler<TRequest, TResponse> inner,
IAsyncPreRequestHandler<TRequest>[] preRequestHandlers,
IAsyncPostRequestHandler<TRequest, TResponse>[] postRequestHandlers)
{
this.inner = inner;
this.preRequestHandlers = preRequestHandlers;
this.postRequestHandlers = postRequestHandlers;
}
public async Task<TResponse> Handle(TRequest message)
{
foreach (var preRequestHandler in preRequestHandlers)
{
await preRequestHandler.Handle(message);
}
var result = await inner.Handle(message);
foreach (var postRequestHandler in postRequestHandlers)
{
await postRequestHandler.Handle(message, result);
}
return result;
}
}
我正在使用autofac注册我的预处理器,如下所示:
builder.RegisterAssemblyTypes(Assembly.GetExecutingAssembly())
.As(type => type.GetInterfaces()
.Where(type => type.IsClosedTypeOf(typeof(IAsyncPreRequestHandler<>))))
.InstancePerLifetimeScope();
在运行时我得到重复的前任.我必须过滤删除副本的集合.我不确定为什么会这样.如果我注释掉注册,我没有得到任何预处理器,这表明我没有在其他地方重复注册.
更新:以下是有关该类型似乎已注册两次的更多详细信息.各种类定义:
具体的处理程序
public class ClientEditorFormIdentifierValidationHandler
: IAsyncPreRequestHandler<AddOrEditClientCommand>{}
命令类
public class AddOrEditClientCommand
: IAsyncRequest<ICommandResult>{}
命令界面
public interface IAsyncRequest<out TResponse> { }
最佳答案 经过大量的故障排除后,我发现我实际上是在两次注册我的处理程序.我喜欢使用Autofac Modules将容器的配置分解为可管理的块.
在我的MVC5 Startup类中,我注册了我的模块,如下所示:
builder.RegisterAssemblyModules(Assembly.GetExecutingAssembly());
深入埋藏在“InfrastructureModule”类中的是:
builder.RegisterModule<MediatorModule>();
这当然是重新注册我的调解员处理程序…… DUH ..