How can I debug an Web (ExtJS) .Net application - asp.net

I have inherited an ExtJS project that uses ASP.NET Web Handlers (ashx files) to access a database.
I'm trying to debug the connection to the database which is in the C# portion of the code.
I've tried adding a break point just before the connection to my database is made, but I can't seem to get the application to stop there. They only briefly turn white during debug-execution. Hovering the mouse over the breakpoint when it's in that state shows:
The breakpoint will not currently be hit. No symbols have been loaded for this document.
I've been all over this question, with no better results
In the modules window, the Symbol Status of the DLL does indeed show Symbols Loaded.
The dll/pdb both seem to be copied over to C:\Users\myid\AppData\LocalTempTemporary ASP.Net Files\etc.
(this seems odd, because I would expect it to attach to the .dll in my work folder) Is there a way to tell the debugger to look there instead?
There of course is no exe since this is a web app.
I've:
tried cleaning the solution and rebuilding fresh including a fresh pull from the repository.
verified the build has the "Define Debug Constant" and "Define Trace Constant" are checked
deleted the contents of Temporary ASP.NET
checked the the project was set as Debug
checked that "Just My Code" was disabled in Debug / General
restarted the workstation completely
checked that the Solution has the right project starting (there's only one in it)
checked I'm building in debug (not release)
made small changes to the code to force a recompile
checked that "Automatically determine the type of code to debug " is selected in Attach to Process
run as administrator
checked Optimize Code is not turned on in the project properties
checked that "Use Managed Compatibility Mode" is turned off
There is no aspx involved so the CodeBehind/CodeFile issue is moot.
Beyond that, that answers are very much repetitive or I tried something at random and it worked.
What have I missed? Is there something basic that you are supposed to do with the project so it will let you debug the DLL that perhaps the original developer didn't do (no they aren't available to me)?

Problem resolved...
Ultimately there were two issues.
Originally, the DLL had been compiled as 32bit DLL which didn't play nice with the database (Oracle 64bit). Switching the platform target should have resolved the issue except, IE's cache of the web page hid the fact that I was now getting a classic "Could not load file or assembly xxx or one of its dependencies." error. [incidentally, I've now sett he cache to clear on exit]
This error was caused by IIS Express running in the 32 bit version instead of the 64 bit version. Which means the DLL never really run, and explains the "No symbols have been loaded for this document." warning.
That was then resolved by going to Tools -> Options -> Projects and Solutions -> Web Projects and turning on Make sure that Use the 64 bit version of IIS Express for web sites and projects.
Clean and rebuild, and everything works tickety-boo

Related

Developing .Net with Visual Studio 2015, after installing the Windows 10 update, aspx pages are blank

A forced Windows 10 update installed successfully. The update history shows "2017-07 Cumulative Update for Windows 10 Version 1703 for x64-based Systems (KB4025342)" among a total of 45 other updates installed on 7/29/2017.
After updating and attempting to launch my project in the debugger, which has always worked before:
I now get a blank page for every URL. I'm debugging in IIS Express on localhost. View Source yields an absolutely blank page also (this is definitely not the IIS file association problem that I've seen documented).
I did absolutely nothing else (to cause this) besides install Windows 10 (and I wouldn't have if MS didn't force me to). After this I did a clean/rebuild completely from scratch, I then removed the Bin folder, re-installed all the NuGet packages, still exactly the same result, F5 launches the web application in debug mode and launches the page as usual but it is completely blank. It does not execute any code, Page_Load is not called.
Visual Studio 2017 made no difference
I switched to IIS and got a 500.19 error with 0x80020021 error code which this page 500.19 error with IIS7.5 addresses, after unlocking the two subsections of system.web.server that were locked (why were they locked?)
it now returns 404.3 Not Found, with:
-- It is possible that a handler mapping is missing. By default, the static file handler processes all content. (well, not .aspx pages!)
-- The feature you are trying to use may not be installed. (somehow maybe this is true, but how?)
-- The appropriate MIME map is not enabled for the Web site or application.
(Warning: Do not create a MIME map for content that users should not download, such as .ASPX pages or .config files.) (right... there should not be a MIME map entry for .ASPX)
-- If ASP.NET is not installed. (how could this be?)
ASP.NET installation -- it is built in to Windows 10, I installed the .NET developer packs and tried 4.5.2, 4.6.1 and 4.7, No change.
In summary: nothing has helped. With IIS Express, or IIS, same problem. All .aspx urls return a completely blank page and no code in the code-behind .cs files gets executed. Fiddler says 503 (but 503 is not shown in the browser, either Edge or Chrome).
Latest unsuccessful effort: I went back to the previous build (rolled back the latest Windows update) by selecting "Go back to an earlier build" from "Update Settings/Windows Update/Update History" and I still have the problem. So, either I'm really stuck now, or I've opened up a lot of possibilities based on a wrong assumption that it was the update that caused the problem. Something is corrupt? Something changed in my project that I'm not aware of? Corrupt: I ran the system file scanner, sfc /scannow and it found no problems. Back to the drawing board...
Success!... OK, so the problem wasn't just Windows 10 Update directly breaking something which I wondered how that was possible, but it sure seemed like it.
I have now rebuilt my solution from scratch, creating a new web site project in VS and pouring the minimum number of files in first, basically Login and some utilities, enough to build and test and see that it worked. Then in about 3 doses I added everything else and it kept on working. I also reloaded all the Nuget packages, and switched from .NET 4.5.2 to .NET 4.6.1. (so I broke the rule of only 1 change). I did a full compare with Beyond Compare and the only differences are some obsolete page files that I just left out of the new one, and the binaries and the different build target (.NET 4.6.1).
Could the Windows update have broken/corrupted a binary? It force rebooted my system which I can't stand. Who knows... maybe, it was quite a coincidence. Oh well.

Problem with built assembly not matching source when debugging under IIS 7.5

I have a problem debugging a web forms application that is configured to use IIS for debugging, under Windows 7 and Visual Studio 2010. An example has just occurred, where I make a change to the code behind for a web form, save, and apparently rebuild before starting the app using F5.
The app starts, and I get an error message trying to do something in the app. I tell the debugger to break when an exception is thrown and try my task again, only to be told
The source file is different from when the module was built.
where the module is C:\Windows\Microsoft.NET\Framework64\v2.0.50727\Temporary ASP.NET Files\root\9d7b45ca\11a98b19\assembly\dl3\5e6cf0b2\636409d4_dfeecb01\PerfixEMS_Admin.DLL
The physical folder for my test web site is set to the web application project's source folder, so I have always assumed that IIS will look in the bin folder for required assemblies, and these will be rebuilt as expected. Why is this not happening?
Cleaning the solution usually works for me.
Update
Given the high number (320) of projects I understand why Clean and Build won't work for you. You should however try it at least once to see if fixes things.
If it does fix your problem but doesn't last you'll need to do one of two things.
Clean just the one file
Delete the offending temp file. You probably won't be able to do this because with VS running since it may have a lock on the DLL. You may also have to stop IIS. You can use Process Explorer to look for the processes that have a lock.
Use a custom solution
Its unlikely that you're going to be modifing all 320 projects at the same time. Create a custom solution for just the projects you're working on. You'll still be able to step through any project you have the DLL and PDB for if you need to.
Which to do
Using a custom solution has its problems since you can no longer use project reference for projects not in your solution. This impacts your team's source control. You'll also have to make sure the DLL's and PDB's from outside your solution are in a stable location and you'll need a way to detect when thoes other projects have changes that you care about.
These problems can be overcome with a careful check-in process for Project changes and scripts that copy files and working with team members to figure out how to communicate changes.
On the other hand closing VS for every change or running Clean and build isn't really tennable either.
it may be a workaround, but I just need to see if it will work or not, then we may investigate more in the original case. but for now, try this:
1- publish this website to a different folder
2- open the newly published version from your preferred browser (ex: http://localhost/APP_NAME).
3- from VS, open "Debug" menu, choose "Attach to process..."
4- select the IIS worker process "w3wp.exe" and click "Attach".
(if you can't find it, make sure that the checkbox "show processes in all sessions" is checked)
5- start debugging your source code normally and let me know what happened, thanks.

Why Arent Breakpoints Working In Web Application Project

My company gave me a web application project and I went to debug it and set some breakpoints and they dont fire. I am using Response.Write all over the place to debug. Anyone know what maybe going on?
I am running the application off my localhost I was pushing F5, but since the breakpoints dont hit by making changes and adding Response.Write statements and clicking save then refreshing my browser I get the changes for whatever reason.
Hovering over the breakpoint it says "The breakpoint will not currently be hit the source code differs from the original version"
Another tidbit is I created a new web application project and created a breakpoint and it works, its only specific to this application it seems like, but dont know what it could be?
Hovering over the breakpoint it says "The breakpoint will not currently be hit the source code differs from the original version"
Try this:
Close Visual Studio and make sure any instances of ASP.NET development server are closed as well
Delete everything from "C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files" (where v4.0.30319 is the version of your .NET Framework)
Definitely need more info, but I would check that your are building with debugging symbols to cover the dumb stuff.
Okay, after reading the comments posted on your question I was making the following assumptions.
You are running using the built in VS development server
You are compiling in debug mode
You've set debugging true in your web.config
I've seen this problem before and for me it's been resolved by restarting Visual Studio.
Assuming that you are running on IIS on the same machine that you have visual studio installed:
Have you attached to the application pool process
Is you code the same as what is deploy? (Is the latest version deployed)
Are you logged in as administrator?
Are you running visual studio as administrator?
Just to make sure, you are running in debug mode?
I ran into this problem a while ago as well, instead of using response.write, you could try outputting the data to a label control's text value instead to see the values of your code.
It's a bit of a sloppy work around, but I couldn't figure out why that one particular project I was working on didn't let me debug it.
This problem is, for me, mostly caused by a mismatch of the loaded dll files (symbols) by webserver, and those that the project are pointing to when you try to breakpoint. It's different files. I have located different causes. One could be a simple hang-up by webdev instans (force shutdown. But also that there occur some kind of mismatch if you got different compilation methods between project within same solution as the web project.
This desc may not be your exact problem, but perhaps it will lead you into right direction. I find this often being a dirty unlogic error that just are irritating (but also completely fixable without data loss or reconfiguring, when u understand the trick).
I had the same problem, and it turned out only Internet Explorer works with debugging and breakpoints. To avoid having IE as my default browser, I changed the launch settings in the .Web project to run IE with the path as command line parameters.

WebService Debug Synchronization (why do my breakpoints give the message "The source code is different from the original version"?)

I'm fairly new to web service development, and I am really confused about how ASP.Net Development Server synchronizes with code during debug mode. When I make changes to my service, I cannot figure out how to propigate those changes so that my client can "see" them (I've been able to synchronize through a stumbling series of publishing the service, viewing the service in browser, etc... but I have a feeling there's a more reliable system than my random ritual).
Here are the symptoms I'm seeing: After I've made a change to the code behind my service (Service1.svc.cs), started the application through the debugger and attached the debugger to the WebDev.WebServer.exe process as well, my latest changes are not executed, and my breakpoints are not hit (they have the message that
"The source code is different from the original version."
What really baffles me, though, is that when the ASP.Net Development Server notification pops up in my system tray, its physical path points to my project folder, so I don't understand how it could be looking at anything but my current code files.
I do not like to play with knives but the only thing that worked for me involves editing the .csproj file itself. So, unload the project file, edit it by cutting and pasting the three asp.net files so that they are together in the ItemGroup. However, sometimes it is necessary to go further as explained here: http://carnotaurus.tumblr.com/post/4130422114/visual-studio-debugging-issue-with-files-of-the-same - Also, I give a list of other proposed solutions that did not work for me. I hope it helps.

ASP.NET web application can't find an assembly

I deployed an ASP.NET web application last night and I when I woke up this morning it was very slow and would occasionally just throw a 'Service Unavailable' error.
I checked the Event Viewer and it was filled up with these errors:
An unhandled exception occurred and the process was terminated.
Exception: System.Runtime.Serialization.SerializationException
Message: Unable to find assembly 'MonoTorrent, Version=0.80.0.0, Culture=neutral, PublicKeyToken=null'
I'm puzzled as it was working perfectly when I deployed it (MonoTorrent is required to retrieve the number of seeders/leechers for a certain torrent off the tracker - this was working fine), but it's no longer working and whenever code that uses MonoTorrent gets involved, the worker process just crashes.
MonoTorrent.dll is in the /bin/ directory.
UPDATE 6/4/10: I compiled the MonoTorrent source code in with the rest of my web application, but it still crashes whenever it uses MonoTorrent. However, it now says that it is Unable to find assembly 'OpenPeer, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null. Here, OpenPeer is the name of the web application's assembly.
This can happen in these circumstances:
The ASP.NET app creates a background thread, which throws an uncaught exception. It looks like ASP.NET catches the exception and wants to log it to the Event Log. To do this, it sends this exception from the Web app's app domain to its own app domain (the default one of the w3wp process). This needs a serialization/deserialization of the exception.
If the exception is a custom one (i.e. defined by the Web app), it cannot be deserialized in the main app domain of ASP.NET because the assembly defining the exception is typically in the Web app's bin directory, not where w3wp.exe is (c:\windows\system32\inetsrv). This causes a serialization exception and w3wp crashes.
There are possible ways to fix the issue (in a - very subjective - order of preference):
Copy the missing DLL in c:\windows\system32\inetsrv
Install the missing DLL in the GAC
Remove the cause of the exception (harder to do than to say, as we say in French)
Catch all exceptions from the background thread yourself and do the logging yourself.
Notes:
If WCF is used and the uncaught exception is FaultException, WCF swallows it and there is no crash
If the uncaught exception is in the thread of the Web request, there is a yellow screen of death, not this serialization exception
It really seems like a bug in ASP.NET
The above is actually a summary of my investigations of this issue yesterday and are only a theory. I tested fixes 1 and 4, as well as using FaultException.
Here are some things you can try..
1.) Flush ASP.Net Temp directory. Restart IIS and recycle Application pool.
2.) Make sure your web-application is running in FULL-TRUST if it really needs FULL-TRUST.
3.) Take the Assembly, try to use it in other asp.net application and run the test application on a seperate server. This might help you diagnose the problem. Also try to run the test asp.net app on the same server but in seperate application pool.
4.) Make sure the IIS website of your application is running under the user account with necessary security priviliges. Try running the application under Administratotr as user.
EDIT-1
5.) Also check if the assembly version is the same as mentioned in web.config. If there's a version mismatch then you can do AssemblyBinding Redirection in web.config.
6.) Also try registaering the Assembly in GAC and see if it loads properly.
EDIT-2
7.) Try reconfigring ASP.NET support on the server or maybe framework runtime re-setup may help. This may not be a sure-shot solution but looking at the problem condition we may want to try various solutions.
8.) Make sure you're not missing any critical update of your windows server platform.
I try to give you some ideas - what I do if I was on your position.
First of all I take a long look of the MonoTorrent.dll before some days that you make your question, and I look it again today. I found and the function that load the dll. My first opinion is that something have to do with the permissions.
I hope that you have access to the server - right ?
My first steps is that:
Ensure that your monotorrent.dll actuall have the right permissions to the bin directory, for Read, and execute by your asp.net app. Some times the copy of one dll, did not get the directory permissions buts carriage out his own permissions. To check if your dll have different permissions from the rest, just right click and see Properties | Security, then go to bin directory and do the same, and compare the Security permissions. If they are different then apply again the Directory permissions and make sure that the dll inherited by the directory.
My second step
Download the ProcessMonitor from sysinternals
http://technet.microsoft.com/en-us/sysinternals/bb896645.aspx
Run ProcessMonitor and try to recreate the error, stop it and analyse to see where and why the dll gets the denied permissions to run.
With the ProcessMonitor you can even see if there is any dll that can not found !
I have check the MonoTorrent dlls and I do not found anything unusual. He have kerner32.dll calls, and use unsafe code to run, ok nothing so special about.
So if you do that 2 steps and give me some feedback, maybe I can go further. (if not solve by you and what you find)
I would advice to setup Regular maintanence probably once in a week at sunday night etc for following,
Delete all temporary files
Delete all ASP.NET IIS temporary files
Restart Server
Problem is, ASP.NET web apps cause lot of temp files to be left in the disk, because of dynamic compilation of regex, seriliazation assemblies etc, such temp stuff never gets deleted, and more and more junk starts getting collected in temp locations, ASP.NET goes slower and slower, and a point comes in where disk as well as memory defragmentation reaches very high point, things start to fail.
No body likes to restart server once a week, but I remember we had no choice, in ASP.NET 1.1 we had stable system after restarting every day, in ASP.NET 2.0 onwards, we are good to have restarting scheduled at once a week.
I have found this problem and I have do all of thing as I can, such as clear temp file, restart server, delete and add reference and I also rebuild the solution. However I can't solving this problem. Finally I move my entity class (almost of them need to serialize) to new folder that I have added to the project and then this problem solved.
This method is work for me.
Try clearing the ASP.NET temp files. It's solved some odd issues before for me.
Otherwise, Fusion-logging may shed some light.
UPDATE: #Charlie - I'm not sure what to make of those logs...it looks like the failed log is from a different AppDomain. Notice the AppBase is set to "file:///c:/windows/system32/inetsrv/" and AppName is w3wp.exe.
I'm pretty sure the Event Viewer should show Application Id: LM/W3SVC/#/ROOT if it was the default AppDomain, too. At this point, all I've got is random guesses.
I notice you're running x64...does MonoTorrent perhaps require x86?
Have you double checked that the directory is an IIS application, and is configured for the correct version of ASP.NET?
Is there some other application that uses MonoTorrent on this server? Maybe a WCF service or something? I'm not sure where the Serialization is happening....
Try hooking the AssemblyResolve event and loading it manually.
Can you repro on a development machine? If not, maybe it's a borked FX install. Uninstall and reinstall.
Does restarting, recycling or stopping/starting the AppPool fix the issue temporarily, or cause the issue to appear?
You may want to type out your screenshot text too so you'll get some Google love....
Is the server timezone different than your timezone? I've had this issue when deploying resource files, the compile time was in the future so they would fail to load.
My guess that you have plenty of open but not closed connections. I mean the connections are not returned to the pool. It looks okay, when you start the application, but after some time there are only several sockets available in the pool and it goes slow. Another thing - non-closed connection may keep DLL in memory, not allowing to release the handler. Try to debug object destruction.
I know it's simple but I had this problem once and itwas because I had a Web Application project which contains
References
Folder and I just copied my files into a
Bin
folder, in any .net web application in the Project Properties windows, a Reference Path tab is available which by default should nothing be include on it. check this option and also Build tab in Project Properties window which Output path be as the same as bin\

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