Get current HttpHandlers for WebApplication

1. gets list of Keys.cs

var eventHandlerList = (EventHandlerList)HttpContextFactory.Context.ApplicationInstance.prop("Events");
var eventList = new List<Object>();
var next = eventHandlerList.field("head");

while (next != null)
{
       	eventList.add(next.field("key"));
	next = next.field("next");
}
return eventList; // there are 12 of these, and they are all objects

//using System.ComponentModel;

2.getting the value of IsContainerInitalizationAllowed.cs

var application      = HttpContextFactory.Context.ApplicationInstance;

var isContainerInitalizationAllowed = application.type().BaseType
                                                        .BaseType
                                                        .properties().where(prop=>prop.Name =="IsContainerInitalizationAllowed").first();
return PublicDI.reflection.getProperty(isContainerInitalizationAllowed, application);

// the value was false (in IIS)

3. getting the values of AsyncAppEventHandlersTable.cs

var application      = HttpContextFactory.Context.ApplicationInstance;

var asyncEventsProp = application.type().BaseType.BaseType.properties().where(prop=>prop.Name == "AsyncEvents").first();
var asyncEvents = PublicDI.reflection.getProperty(asyncEventsProp, application);
return asyncEvents.typeFullName();

// type returned is System.Web.HttpApplication+AsyncAppEventHandlersTable

4. getting AsyncEvents HashTable.cs

var application      = HttpContextFactory.Context.ApplicationInstance;

var asyncEventsProp = application.type().BaseType.BaseType.properties().where(prop=>prop.Name == "AsyncEvents").first();
var asyncEvents = PublicDI.reflection.getProperty(asyncEventsProp, application);
var hashTable = (Hashtable)asyncEvents.field("_table");
return hashTable;

5. getting the EventBeginRequest from Handler from the HttpApplication Events.cs

var application      = HttpContextFactory.Context.ApplicationInstance;

var eventHandlerList = (EventHandlerList)application.prop("Events");


var requestHandler = typeof(HttpApplication).fieldValue("EventBeginRequest");

//option 1: directly
//return eventHandlerList[requestHandler];

//option 2: using reflection
return eventHandlerList.invoke("Find",requestHandler)
                       .field("handler").typeFullName();

//using System.Web;

6. get method implementation and invocation list for the EventBeginRequest.cs

var application      = HttpContextFactory.Context.ApplicationInstance;

var eventHandlerList = (EventHandlerList)application.prop("Events");
var requestHandler   = typeof(HttpApplication).fieldValue("EventBeginRequest");
var eventHandler     = eventHandlerList[requestHandler];

return eventHandler.invoke("GetMethodImpl");   // signature of EventBeginRequest delegates

return eventHandler.GetInvocationList();       // current implementations

return eventHandler.Method;                    // also gets the MethodInfo object (the signature)
return eventHandler.Target;                    // gets the Target objet (for example the global.asax object)
return eventHandler.invoke("GetTarget");       // also gets the target (using reflection)

7. find all Event objects .cs

var application      = HttpContextFactory.Context.ApplicationInstance;

var eventHandlerList = (EventHandlerList)application.prop("Events");

// this returns a list of all fields
return typeof(HttpApplication).fields().select(field => field.Name ).asString() ;  

//this only gets the fields that start with Event:

return typeof(HttpApplication).fields().where(field=>field.Name.starts("Event"))
                                       .select(field => field.Name )
                                       .asString() ;
                                       
//this gets the objects of those event fields:

var eventsFields    = typeof(HttpApplication).fields().where(field=>field.Name.starts("Event"))
                                       .select(field => typeof(HttpApplication).fieldValue(field.Name))
                                       .asString() ;
return eventsFields;

//Better version where the events's objects are mapped by name:
var eventsFields = new Dictionary<String,Object>();
foreach(var field in typeof(HttpApplication).fields().where(field=>field.Name.starts("Event")))
	eventsFields.Add(field.Name, typeof(HttpApplication).fieldValue(field.Name));
	
return eventsFields;

//Mapping the current EventHandlerList.ListEntry  
var eventsFields = new Dictionary<String,Object>();
foreach(var field in typeof(HttpApplication).fields().where(field=>field.Name.starts("Event")))
{
	var eventObject  = typeof(HttpApplication).fieldValue(field.Name);
	var listEntry = eventHandlerList.invoke("Find",eventObject); // returns EventHandlerList.ListEntry 
//        if (listEntry != null)
		eventsFields.Add(field.Name, listEntry);
}	
return eventsFields;

/* without the commented out null check, the above example returned 
{"EventDisposed":null,"EventErrorRecorded":{},"EventRequestCompleted":null,"EventPreSendRequestHeaders":null,
 "EventPreSendRequestContent":null,"EventBeginRequest":{},"EventAuthenticateRequest":{},"EventDefaultAuthentication":null,
 "EventPostAuthenticateRequest":{},"EventAuthorizeRequest":{},"EventPostAuthorizeRequest":null,"EventResolveRequestCache":{},
 "EventPostResolveRequestCache":{},"EventMapRequestHandler":null,"EventPostMapRequestHandler":null,
 "EventAcquireRequestState":{},"EventPostAcquireRequestState":{},"EventPreRequestHandlerExecute":null,
 "EventPostRequestHandlerExecute":null,"EventReleaseRequestState":{},"EventPostReleaseRequestState":null,
 "EventUpdateRequestCache":{},"EventPostUpdateRequestCache":null,"EventLogRequest":null,"EventPostLogRequest":null,
 "EventEndRequest":{}}
 
 and this with the listEntry null check (i.e. only the current 12 that are being executed will be shown)
 
 {"EventErrorRecorded":{},"EventBeginRequest":{},"EventAuthenticateRequest":{},"EventPostAuthenticateRequest":{},
 "EventAuthorizeRequest":{},"EventResolveRequestCache":{},
 "EventPostResolveRequestCache":{},"EventAcquireRequestState":{},
 "EventPostAcquireRequestState":{},"EventReleaseRequestState":{},
 "EventUpdateRequestCache":{},"EventEndRequest":{}}
 */
 
 // here is the list current events and who they are mapped to:
 
 var eventsFields = new Dictionary<String,Object>();
foreach(var field in typeof(HttpApplication).fields().where(field=>field.Name.starts("Event")))
{
	var eventObject  = typeof(HttpApplication).fieldValue(field.Name);
	var listEntry = eventHandlerList.invoke("Find",eventObject); // returns EventHandlerList.ListEntry 
        if (listEntry != null)
        {
        	var handler = listEntry.field("handler");
                var target  = handler.prop("Target");
                var method  = handler.prop("Method");
		eventsFields.Add(field.Name, "{0} - {1}".format(target,method));
	}
}	
return eventsFields;

// and finally here is a better version that uses the Invocation list to get all methods invoked (not just the first one like in the example above)

var application      = HttpContextFactory.Context.ApplicationInstance;

var eventHandlerList = (EventHandlerList)application.prop("Events");

var eventsFields = new Dictionary<String,Object>();
foreach(var field in typeof(HttpApplication).fields().where(field=>field.Name.starts("Event")))
{
	var eventObject  = typeof(HttpApplication).fieldValue(field.Name);
	var listEntry = eventHandlerList.invoke("Find",eventObject); // returns EventHandlerList.ListEntry 
        if (listEntry != null)
        {
        	var handler        = listEntry.field("handler");                
                var invocationList = (Delegate[])handler.invoke("GetInvocationList");
                var eventMapping   = "";
                for(int i =0 ; i < invocationList.size() ; i++)
                	eventMapping += "[{0} - {1} : {2}] ".format(i, invocationList[i].Method, invocationList[i].Target);
                        
		eventsFields.Add(field.Name, eventMapping);
	}
}	
return eventsFields;

// which produces this output:
/*
{"EventErrorRecorded":"		  [0 - Void Application_Error(System.Object, System.EventArgs) 			  : ASP.global_asax] ",
 "EventBeginRequest":"		  [0 - Void Application_BeginRequest(System.Object, System.EventArgs) 		  : ASP.global_asax] ",
 "EventAuthenticateRequest":"	  [0 - Void OnEnter(System.Object, System.EventArgs) 				  : System.Web.Security.WindowsAuthenticationModule] 
                             	  [1 - Void AuthenticateRequestHandler(System.Object, System.EventArgs) 	  : System.Web.Handlers.ScriptModule] 
                             	  [2 - Void Application_AuthenticateRequest(System.Object, System.EventArgs) 	  : ASP.global_asax] ",
 "EventPostAuthenticateRequest":" [0 - Void OnEnter(System.Object, System.EventArgs) 				  : System.Web.Security.DefaultAuthenticationModule] ",
 "EventAuthorizeRequest":"	  [0 - Void OnEnter(System.Object, System.EventArgs) 				  : System.Web.Security.UrlAuthorizationModule] 
                         	  [1 - Void OnEnter(System.Object, System.EventArgs) 				  : System.Web.Security.FileAuthorizationModule] ",
 "EventResolveRequestCache":"	  [0 - Void OnEnter(System.Object, System.EventArgs) 				  : System.Web.Caching.OutputCacheModule] ",
 "EventPostResolveRequestCache":" [0 - Void OnApplicationPostResolveRequestCache(System.Object, System.EventArgs) : System.Web.Routing.UrlRoutingModule] ",
 "EventAcquireRequestState":"	  [0 - Void OnEnter(System.Object, System.EventArgs) 				  : System.Web.Profile.ProfileModule] 
                            	  [1 - Void Application_AcquireRequestState(System.Object, System.EventArgs) 	  : ASP.global_asax] ",
 "EventPostAcquireRequestState":" [0 - Void OnPostAcquireRequestState(System.Object, System.EventArgs) 		  : System.Web.Handlers.ScriptModule] ",
 "EventReleaseRequestState":"	  [0 - Void OnReleaseState(System.Object, System.EventArgs) 			  : System.Web.SessionState.SessionStateModule] ",
 "EventUpdateRequestCache":"	  [0 - Void OnLeave(System.Object, System.EventArgs) 				  : System.Web.Caching.OutputCacheModule] ",
 "EventEndRequest":"		  [0 - Void OnEndRequest(System.Object, System.EventArgs) 			  : System.Web.SessionState.SessionStateModule] 
                             	  [1 - Void OnLeave(System.Object, System.EventArgs) 				  : System.Web.Profile.ProfileModule] 
                             	  [2 - Void EndRequestHandler(System.Object, System.EventArgs) 			  : System.Web.Handlers.ScriptModule] "}
*/