根据我的上一篇文章,我已经成功实现了批处理...直到某个点。除了注册路由特定的处理程序外,我还有两个委托处理程序:
- 验证用户
- 记录日志
批处理程序通过委派处理程序对用户进行身份验证并记录请求。当messagehandlerinvoker开始发送子/嵌套请求时,会抛出以下异常。
System.ArgumentException was unhandled by user code
HResult=-2147024809
Message=The 'DelegatingHandler' list is invalid because the property 'InnerHandler' of 'AuthenticationMessageHandler' is not null.
Parameter name: handlers
Source=System.Net.Http.Formatting
ParamName=handlers
StackTrace:
at System.Net.Http.HttpClientFactory.CreatePipeline(HttpMessageHandler innerHandler, IEnumerable`1 handlers)
at System.Web.Http.HttpServer.Initialize()
at System.Web.Http.HttpServer.<EnsureInitialized>b__3()
at System.Threading.LazyInitializer.EnsureInitializedCore[T](T& target, Boolean& initialized, Object& syncLock, Func`1 valueFactory)
at System.Threading.LazyInitializer.EnsureInitialized[T](T& target, Boolean& initialized, Object& syncLock, Func`1 valueFactory)
at System.Web.Http.HttpServer.EnsureInitialized()
at System.Web.Http.HttpServer.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
at System.Net.Http.HttpMessageInvoker.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
at RoutingRequest.Service.Startup.BatchMessageHandler.<>c__DisplayClassd.<PrcoessRequest>b__b(Task`1 m) in C:\CEI\Clients\Footlocker.com\FL - Vendor Routing Portal\source\RoutingRequest.Service\Startup\BatchMessageHandler.cs:line 45
at System.Threading.Tasks.ContinuationResultTaskFromResultTask`2.InnerInvoke()
at System.Threading.Tasks.Task.Execute()
InnerException:
我是否遗漏了某个配置选项,或者需要绕过委托处理程序?
编辑 这是我的身份验证处理程序。
public class AuthenticationMessageHandler
: DelegatingHandler
{
protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
{
SetCurrentUser(request);
return base.SendAsync(request, cancellationToken);
}
private void SetCurrentUser(HttpRequestMessage request)
{
var values = new List<string>().AsEnumerable();
if (request.Headers.TryGetValues("routingrequest-username", out values) == false) return;
var username = values.First();
var user = Membership.GetUser(username, true);
if (user == null)
{
var message = string.Format("membership information for '{0}' could not be found.", username);
throw new HttpRequestException(message);
}
var roles = Roles.GetRolesForUser(username);
Thread.CurrentPrincipal = new GenericPrincipal(new GenericIdentity(user.UserName), roles);
}
}
根据Kiran的回答,子类化的httpserver解决了一个问题,但引入了另一个问题。我的角色提供程序出现了空引用异常。现在正在调查这个问题。