We have an application that uses the Windows Presentation Framework.
One of our users gets a crash on load. The user sent the problem signature to me, and when I looked it up I realised the error was not in our code but rather in the presentationframework.dll.
I used ildasm.exe to find out what method was failing and it was this one:
.method /*06000880*/ public hidebysig newslot abstract virtual
instance void AddPlace(class MS.Internal.AppModel.IShellItem/*020000A9*/ psi,
valuetype [WindowsBase/*23000006*/]MS.Internal.Interop.FDAP/*010000AF*/ fdcp) cil managed
{
}
It throws a NotImplementedException.
The user has the same version of the presentationframework.dll as I have, v4.0.30319 but I have never stumbled upon this error, nor have I heard of any other user that has encountered this. The exact version in the problem signature is 4.0.30319.36366.
Unfortunately I have no direct access to the users computer, so I cannot investigate further. Does anyone know what might have caused this, or can anyone point me in some direction? I feel kind of lost.
Related
I am currently stuck with the following problem and running desperately out of ideas, any clues are welcome!
We are using a custom built framework that loads what we call "pages" on demand for the UI, each of these "pages" is a self contained Silverlight XAML that is loaded on demand via:
XamlReader.Load(somePageXamlFile)
It may happen that a part inside this xaml is outdated, so a try / catch block ensures that a XAMLParseException is caught and the respective error handled.
Our current error handling is heavily based on the message of the exception, e.g. we expect a message like this:
"The type 'someType' could not be found. [Line: x Position: y]"
-> we parse the message string and replace the essential xaml parts with custom logic to make it valid again and display info for administrators.
The problem:
Some test machines throw the same exception, but with a different message!
Errormessage there:
"Error 2502 An error has occured."
This breaks our "safety net" logic for this case and currently we can not figure out any reason for this.
Solutions or proposals are very welcome,
thanks in advance!
-Steve
After long and hard search we came down to the following: The clients and the development machines seem to have different versions of the Microsoft agcore.dll (development machines have 2 different version in different paths). As this is the core of the exception we suppose this is the reason for the different error message - we were unable to fix this issue however (we cannot be sure what dll our clients get during SL5 download...) therefore we decided to rewrite the whole code segment to not make use of the exception message text at all. Lesson learned.
Thanks for the feedback. -Steve
We are using Episerver and ImageVault and it has worked fine for a long time. Until recently when showing albums to public users stopped working for no apparent reason.
No code changes in our project or change to the surrounding server environment.
An exception is thrown when the IVFileList control databinds. The exception that is thrown is "the trust relationship between the primary domain and the trusted domain failed".
I have debugged the code and come to the conclusion that the reason for the exception is actually because episerver tries to find a user called "Anonymous" with the WindowsMemberShipProvider. I have included a simplified stack trace below (excluded several calls for readability). I starts of with the DataBind call which leads to a call to episervers multiplexprovider to find the user "Anonymous" this in turn leads to a call to the method TranslateToSids that throws the exception.
System.Security.Principal.NTAccount.TranslateToSids(...)
EPiServer.Security.MultiplexingMembershipProvider.FindMembershipUser("Anonymous")
ImageStoreNET.Developer.WebControls.IVFileListData.DataBind()
I found a workaround for this problem by creating an local account in the webserver and named it "Anonymous". And now it all works again! The TranslateToSids method no longer throws the exception and the album pictures are visible.
Does anyone have a theory why this account suddenly is needed? We never had one before as we can recall. Although the workaround works, it feels like a ugly solution to create a local account. It should be a more correct way of solving this. Any suggestions?
We have built a website based on the design of the Kigg project on CodePlex:
http://kigg.codeplex.com/releases/view/28200
Basically, the code uses the repository pattern, with a repository implementation based on Linq-To-Sql. Full source code can be found at the link above.
The site has been running for some time now and just about a year ago we started to get errors like:
There is already an open DataReader associated with this Command which must be closed first.
ExecuteNonQuery requires an open and available Connection. The connection's current state is closed.
These are the closest error examples I can find based on my memory. These errors started to occur when the site traffic started to pick up. After banging my head against the wall, I figured out assumed that the problem is inherit within Linq-To-Sql and how we are using the same connection to call multiple commands in a single web request.
Evenually, I discovered MARS (Multiple Active Result Sets) and added that to the data context's connection string and like magic, all of my errors went away.
Now, fast forward about 1 year and the site traffic has increased tremendously. Every week or so, I will get an error in SQL Server that reads:
A severe error occurred on the current command. The results, if any, should be discarded
Immediately after this error, I receive hundreds to thousands of InvalidCastException errors in the error logs. Basically, this error shows up for each and every call to the Linq-To-Sql data context. Only after I restart the web server do these errors clear up.
I read a post on the Micosoft Support site that descrived my problem (minus the InvalidCastException errors) and stating the solution is that if I'm going to use MARS that I should also use Asncronous Processing=True. I tried this, but it did not solve my problem either.
Not really sure where to go from here. Hopefully someone here has seen and solved this problem before.
I have the same issue. Once the errors start, I have to restart the IIS Application Pool to fix.
I have not been able to reproduce the bug in dev despite trying many different scenarios involving multi-threading, leaving connections open, etc etc.
One possible lead I do have is that amongst the errors in the server Event Log is an OutOfMemoryException for the Application Pool. Perhaps this is the underlying cause of the spurious SQL Datareader errors (a memory leak elsewhere). Although again I haven't been able to reproduce this in dev.
Obviously if you are using a 64 bit OS then this is probably not the cause in your case.
So after much refactoring and re-architecting, we figured out that problem all along is MARS (Multiple Active Result Sets) itself. Not sure why or what happens exactly but MARS somehow gets result sets mixed up and doesn't recover until the web app is restarted.
We removed MARS and the errors stopped.
If I remember correctly, we added MARS to solve the problem where a connection/command was already closed using LinqToSql and we tried to access an object graph that hadn't been loaded. Without MARS, we'd get an error. But when we added MARS, it seemed to not care about it. This is really a great example of us not really understanding what the heck we were doing and we learned some valuable (and expensive) lessons from this.
Hope this helps others who have experienced this.
Thanks to all how have contributed their comments and answers.
I understand you figured out the solution..
Following is not a direct solution to the problem; but it is good for others to take a look at
What does "A severe error occurred on the current command. The results, if any, should be discarded." SQL Azure error mean?
http://social.msdn.microsoft.com/Forums/en-US/bbe589f8-e0eb-402e-b374-dbc74a089afc/severe-error-in-current-command-during-datareaderread
I'm working on a Silverlight app that has an UnhandledException handler in the App class, which shows a message box containing the exception message. This is often fine for custom exceptions. However, it's not so good for built-in exceptions (e.g. NullReferenceException), because users don't have the developer runtime installed and therefore get a rather ugly "Debugging resource strings are unavailable" message.
My first thought (which I quickly dismissed) was to check the exception message for "debugging resource strings". I imagine if someone's running the app in, say, French, they'd get something like "les chaînes de ressources de débogage", so that wouldn't work.
Perhaps there's a way for a Silverlight app to detect whether it's running in the end-user runtime vs. the developer runtime? I've looked in the Application and Environment and Deployment classes, and haven't found anything.
I suppose this wouldn't be an issue if the application always threw custom exceptions anytime some sort of message needed to be shown to the user. Then I could easily hide the non-custom ones with a friendlier generic message. Is that the best/only option?
Just from an application design point of view, what user will know what to do with any kind of techy error message? "The value 'null' was found where an instance of an object was required." huh??
A simple "Something bad happened, if it continues, please contact support" should suffice. Just ensure that you log whatever bad happened somewhere, so that when you get the phone call/email, you can retrieve the issue in whatever techy details you require to solve the problem.
I'm getting the following error now when I build my Silverlight Business Application:
The code generator
'Microsoft.ServiceModel.DomainServices.Tools.CSharpCodeDomClientCodeGenerator'
encountered a fatal exception and
could not generate code for project
'C:\Software\ProjectPartCenterAdmin\Alpha\Latest
Version\ProjectPartCenterAdmin\ProjectPartCenterAdmin.csproj':
Exception has been thrown by the
target of an invocation.
I DID ABSOLUTELY NOTHING TO MY CODE since it last worked! All I did was a clean rebuild of the application. Is there a way to get the details on what the exception was? I am dead in the water until i can figure this out.
Oh, and by the way, I hate code generation! I've had endless problems with RIA Services and I'm trying my best to do things "the right way"; that is, no hacks.
Edit:
I've also been getting a similar warning:
The following exception occurred
creating the MEF composition
container:
Unable to load one or more
of the requested types. Retrieve the
LoaderExceptions property for more
information.
The default code
generator will be used.
I've been getting this for some time now, and have ignored it because the application seems to be working fine.
Also, when I remove my CustomValidation attributes the exception goes away. But the warnings do not.
First, you need to check if there were custom validation errors in the project. I had the same issue but when I realized that I had two validation result methods with the same name! and change it, the built was successfull.