Isapiruntime parsing in ASP. NET request processing mechanism

Today I saw the life cycle of Web requests, and after reading it some do not understand, is to use the Anti-compilation tool to view the internal implementation of the package inside the library.

Web.dll from inside the computer, use the Anti-compilation tool to open

After opening

 Public intProcessRequest (IntPtr ECB,intIwrtype) {INTPTR IntPtr=IntPtr.Zero; if(Iwrtype = =2) {intPtr=ECB; ECB=UNSAFENATIVEMETHODS.GETECB (INTPTR); }
       //Create the Isapiworkerrequest first, encapsulate the request packet, call the Createworkerrequest method to implement, Isapiworkerrequest isapiworkerrequest=NULL; intresult; Try            {                BOOLUseoop = Iwrtype = =1; Isapiworkerrequest=isapiworkerrequest.createworkerrequest (ECB, useoop);                Isapiworkerrequest.initialize (); stringapppathtranslated =isapiworkerrequest.getapppathtranslated (); stringAppdomainapppathinternal =httpruntime.appdomainapppathinternal; if(Appdomainapppathinternal = =NULL||Stringutil.equalsignorecase (apppathtranslated, appdomainapppathinternal)) {
                  //Call the Processrequestnodemand method and pass the encapsulated request message in                    Httpruntime.processrequestnodemand (isapiworkerrequest); Result=0; }                Else{Httpruntime.shutdownappdomain (applicationshutdownreason.physicalapplicationpathch Anged, SR. GetString ("hosting_phys_path_changed",New Object[] {appdomainapppathinternal, apppathtranslated                    })); Result=1; }            }            Catch(Exception ex) {Try{Webbaseevent.raiseruntimeerror (ex, This); }                Catch                {                }                if(Isapiworkerrequest = =NULL|| ! (ISAPIWORKERREQUEST.ECB = =IntPtr.Zero)) {Throw; }                if(IntPtr! =IntPtr.Zero) {unsafenativemethods.setdonewithsessioncalled (INTPTR); }                if(ex isThreadAbortException)                {Thread.resetabort (); } result=0; }            returnresult; }

Create different objects within createworkerrequest based on different versions of IIS

// System.Web.Hosting.ISAPIWorkerRequest

Internal Static BOOL useoop)

{isapiworkerrequest result; if(Useoop) {Etwtrace.traceenablecheck (etwtraceconfigtype.downlevel, IntPtr.Zero); if(Etwtrace.istraceenabled (5,1) {etwtrace.trace (etwtracetype.etw_type_appdomain_enter, ECB, Thread.getdomain (). FriendlyName,NULL,false); } result=NewIsapiworkerrequestoutofproc (ECB); } Else { intnum = unsafenativemethods.ecbgetversion (ECB) >> -; if(Num >=7) {Etwtrace.traceenablecheck (ETWTRACECONFIGTYPE.IIS7_ISAPI, ECB); } Else{Etwtrace.traceenablecheck (etwtraceconfigtype.downlevel, IntPtr.Zero); } if(Etwtrace.istraceenabled (5,1) {etwtrace.trace (etwtracetype.etw_type_appdomain_enter, ECB, Thread.getdomain (). FriendlyName,NULL,true); } if(Num >=7) {result=NewISAPIWorkerRequestInProcForIIS7 (ECB); } Else { if(num = =6) {result=NewISAPIWorkerRequestInProcForIIS6 (ECB); } Else{result=NewIsapiworkerrequestinproc (ECB); } } } returnresult;}

Enter Processrequestnodemand interior

//System.Web.HttpRuntimeInternal Static voidProcessrequestnodemand (HttpWorkerRequest wr) {Requestqueue Requestqueue=Httpruntime._theruntime._requestqueue; Url    Updateinitialcounters (); if(Requestqueue! =NULL) {WR=Requestqueue.getrequesttoexecute (WR); }    if(WR! =NULL) {Httpruntime.calculatewaittimeandupdateperfcounter (WR); Url Resetstarttime ();
       //Call the Processrequestnow method and pass the encapsulated request message into the    Httpruntime.processrequestnow (WR); }}

// System.Web.HttpRuntime Internal Static void Processrequestnow (HttpWorkerRequest wr) {    httpruntime._theruntime.processrequestinternal (WR);}

Go inside the ProcessRequestInternal method

//System.Web.HttpRuntimePrivate voidprocessrequestinternal (HttpWorkerRequest wr) {interlocked.increment (ref  This. _activerequestcount); if( This. _disposinghttpruntime) {        Try{wr. Sendstatus (503,"Server Too Busy"); Url Sendknownresponseheader ( A,"text/html; Charset=utf-8"); byte[] bytes = Encoding.ASCII.GetBytes (""); byte[] expr_45 =bytes; Url            Sendresponsefrommemory (expr_45, expr_45.length); Url Flushresponse (true); wr.        Endofrequest (); }        finally{interlocked.decrement (ref  This. _activerequestcount); }        return;    } HttpContext HttpContext; Try    {
   //Create a HttpContext object based on the request message and return if an error is created 404
HttpContext=NewHttpContext (WR,false); }    Catch    {        Try{wr. Sendstatus ( -,"Bad Request"); wr. Sendknownresponseheader ( A,"text/html; Charset=utf-8"); byte[] Bytes2 = Encoding.ASCII.GetBytes (""); byte[] Expr_a5 =Bytes2; wr. Sendresponsefrommemory (Expr_a5, Expr_a5.            Length); wr. Flushresponse (true); wr.            Endofrequest (); return; }        finally{interlocked.decrement (ref  This. _activerequestcount); }} WR. Setendofsendnotification ( This. _asyncendofsendcallback, HttpContext);    Hostingenvironment.incrementbusycount (); Try    {        Try        {
           //Set the first request to false  This.        Ensurefirstrequestinit (HttpContext); }        Catch        {            if(!httpContext.Request.IsDebuggingRequest) {Throw; }        }
        //Initialize Response httpContext.Response.InitResponseWriter ();
      //Create application instances based on HttpApplicationFactory IHttpHandler applicationinstance=Httpapplicationfactory.getapplicationinstance (HttpContext); if(ApplicationInstance = =NULL)        {            Throw NewHttpException (SR. GetString ("Unable_create_app_object")); }        if(Etwtrace.istraceenabled (5,1) {etwtrace.trace (Etwtracetype.etw_type_start_handler, Httpcontext.workerrequest, Applicationinst Ance. GetType (). FullName,"Start"); }        if(applicationinstance isIHttpAsyncHandler) {IHttpAsyncHandler Httpasynchandler=(IHttpAsyncHandler) applicationinstance; Httpcontext.asyncapphandler=Httpasynchandler; Httpasynchandler.beginprocessrequest (HttpContext, This. _handlercompletioncallback, HttpContext); }        Else{applicationinstance.processrequest (HttpContext);  This. Finishrequest (Httpcontext.workerrequest, HttpContext,NULL); }    }    Catch(Exception e) {httpContext.Response.InitResponseWriter ();  This.    Finishrequest (WR, HttpContext, E); }}

Enter Ensurefirstrequestinit

//System.Web.HttpRuntimePrivate voidEnsurefirstrequestinit (HttpContext context) {if( This. _beforefirstrequest) {        BOOLFlag =false; Try{Monitor.Enter ( This,refflag); if( This. _beforefirstrequest) {               //Set the first request to false                 This. _firstrequeststarttime =Datetime.utcnow;  This.                Firstrequestinit (context);  This. _beforefirstrequest =false; Context. Firstrequest=true; }        }        finally        {            if(flag) {Monitor.Exit ( This); }        }    }}

There are 26 methods in application, there are 19 request pipeline events from top to bottom

Isapiruntime parsing in ASP. NET request processing mechanism