how do I populate a field M/R field (custitem_mr_field) from the error that was thrown in the try and catch statement? Do I have to use submitFields or setValue?
try{
//Insert code here
} catch (e) {
log.error(JSON.stringify(e));
throw e.message;
}
The issue I have seen with this is that when I try to access the "e" inside the catch, it has always been undefined for some reason (at lease inside of a suitelet) so I would always end up with an exception that e is undefined instead of being able to strigify or access e.message. I don't know if anyone else has seen that issue or not.
You can use both, it depends on the situation. If the record that you want to update the error on is already loaded (you loaded it for some other reason OR you are in a User Event / Client Script in EDIT) so you should use setValue otherwise use submitFields.
Related
I have to add a control inside a changeCompany() in an existing class.
I suppose the code below is OK, but I have a doubt : Does the "return" order imply that a return to the original company is done ?
Or is there to add a statement, unknown by me, something like revertToPreviousCompany()?
try
{
changeCompany(companyId)
{
// the method will produce a message and return false if an error
if (!this.doSomeChecks()) {
return;
}
// much more code below
Yes that is OK as in some situations you wouldn't even be able to revert it if not done by the runtime itself.
Imagine a callstack in which you have try - catch around some code your are calling and you expect there may be thrown an error but if the code which calls your code already established a transaction your handler is not called and therefore you wouldn't have a chance to undo the changeCompany
My Flex app uses local SharedObjects. There have been incidents of the Flash cookie getting corrupt, for example, due to a plugin crash. In this case SharedObjects.getLocal will throw an exception (#2006).
My client wants the app to recover gracefully: if the cookie is corrupt, I should replace it with an empty one.
The problem is, if SharedObject.getLocal doesn't return an instance of SharedObject, I've nothing to call clear() on.
How can I delete or replace such a cookie?
Many thanks!
EDIT:
There isn't much code to show - I access the local cookie, and I can easily catch the exception. But how can I create a fresh shared object at the same location once I caught the exception?
try {
localStorage = SharedObject.getLocal("heywoodsApp");
} catch (err:Error) {
// what do I do here?
}
The error is easily reproduced by damaging the binary content of a Flash cookie with an editor.
I'm not really sure why you'd be getting a range error - esp if you report that can find it. My only guess for something like this is there is a possibility of crossing boundries with respect to the cross-domain policy. Assuming IT has control over where the server is hosted, if the sub-domain ever changed or even access type (from standard to https) this can cause issues especially if the application is ongoing (having been through several releases). I would find it rather hard to believe that you are trying to retrieve a named SO that has already been named by another application - essentially a name collision. In this regard many of us still uses the reverse-dns style naming convention even on these things.
If you can catch the error it should be relatively trivial to recover from: - just declare the variable outside the scope of the try so it's accessible to catch as well. [edit]: Since it's a static method, you may need to create a postfix to essentially start over with a new identifier.
var mySO:SharedObject;
....
catch(e:Error)
{
mySO = SharedObject.getLocal('my.reversedns.so_name_temp_name');
//might want to dispatch an error event or rethrow a specific exception
//to alert the user their "preferences" were reset.
}
You need to be testing for the length of SharedObject and recreate if it's 0. Also, always use flush to write to the object. Here's a function we use to count the number of times our software is launched:
private function usageNumber():void {
usage = SharedObject.getLocal("usage");
if (usage.size > 0) {
var usageStr:String = usage.data.usage;
var usageNum:Number = parseInt(usageStr);
usageNum = usageNum + 1;
usageStr = usageNum.toString();
usage.data.usage = usageStr;
usage.flush();
countService.send();
} else {
usage.data.usage = "1";
usage.flush();
countService.send();
}
}
It's important to note that if the object isn't available it will automatically be recreated. That's the confusing part about SharedObjects.
All we're doing is declaring the variable globally:
public var usage:SharedObject;
And then calling it in the init() function:
usage = SharedObject.getLocal("usage");
If it's not present, then it gets created.
I have a asp.net website.
In this website I have made many function, these function are called inside another function. I want to write all the data that was passed to the function along with the value to a log file.
let us suppose an example
public void MyFunction(int a, int b)
{
try
{
int result=a/b;
}
catch
{
Some Code Here so that I can catch the exception and write into my log file like
/**Function Name: MyFunction**/
/**Parameter a=9;**/
/**b=0;**/
}
}
I have searched for postsharp but it doesnt work with website.
use a try/catch block
i.e.
try {
// call a method
} catch(Exception e) {
// an error occurred, details are in the local variable e
}
Assuming you are using a function/method that is part of the .NET library then you can check the documentation which will list all of the possible exceptions. E.g. See "Exceptions": http://msdn.microsoft.com/en-us/library/b9skfh7s.aspx
You can then use try/catch to catch any exceptions that may be thrown.
Take a look at ELMAH.
It is quite is to install and configure.
You will be up and running in no time.
If you want to log also info about passed in parameters I would just rethrow an exception which contains all this info.
Elmah will record it for you
** EDIT **
Here you have a tutorial on how to get up and running.
I recommend that you use nuget, here is a nice step through:
elmah-using-nuget-what-they-are-and-why-you-should-use-them-part-1/
Could anyone tell me why a problem in the noun model would not be caught by this try catch?
I have tried this on two different controller methods now, and both times, even if the linq2sql doesn't allow the data to be saved, the code never jumps into the catch block.
I've watched the noun object in the middle of the trace, and the isvalid property is false, but the modelstate isvalid is true. Either way, the code never jumps into the catch block.
I'm pulling my hair out about this. I feel like it will be something really silly.
The code all works similar to nerd dinner.
NounRepository nounRepository = new NounRepository();
Noun noun = new Noun();
try
{
UpdateModel(noun);
nounRepository.Add(noun);
nounRepository.save();
}
catch (Exception ex)
{
ModelState.AddRuleViolations(noun.GetRuleViolations());
return View(noun);
}
return View(noun);
Update
I have just added this code, and now the rules are coming back to the front end fine, so it just seems that the try catch isn't catching!
UpdateModel(noun);
if (!noun.IsValid)
{
var errors = noun.GetRuleViolations();
ModelState.AddRuleViolations(noun.GetRuleViolations());
return View(noun);
}
nounRepository.Add(noun);
nounRepository.save();
I'd rather not have to add code in this manner though, as it seems like an unnecessary duplication.
You faced logical change in mvc - validation here do not throw exceptions. Indeed, you need to check it using if statement.
I doubt that exception is happening - you need to catch linq2sql exception anyway, code is correct. Also there is high a chance that inside 'save' or 'add' you have another catch - this is quite common mistake
Programming Rule #1: catch ain't broken (AKA: SELECT ain't broken).
If you're really in doubt, open up the Debug menu, choose "Exceptions", then tick the box for "Common Language Runtime Exceptions" under "Thrown." This will cause the debugger to break on all first-chance exceptions. If the debugger doesn't break during your update, then the exception is never getting thrown in the first place.
Don't forget to untick when you're done, as the behaviour gets pretty annoying under normal usage.
P.S. Never catch System.Exception. Catch the specific type(s) of exception(s) that you know might actually be thrown.
Are you doing something in another thread? That is often a cause exceptions not being caught.
I am seeing strange behaviour with the flash.media.Sound class in Flex 3.
var sound:Sound = new Sound();
try{
sound.load(new URLRequest("directory/file.mp3"))
} catch(e:IOError){
...
}
However this isn't helping. I'm getting a stream error, and it actually sees to be in the Sound constructor.
Error #2044: Unhandled IOErrorEvent:.
text=Error #2032: Stream Error. at... ]
I saw one example in the Flex docs where they add an event listener for IOErrorEvent, SURELY I don't have to do this, and can simply use try-catch? Can I set a null event listener?
IOError = target file cannot be found (or for some other reason cannot be read). Check your file's path.
Edit: I just realized this may not be your problem, you're just trying to catch the IO error? If so, you can do this:
var sound:Sound = new Sound();
sound.addEventListener(IOErrorEvent.IO_ERROR, ioErrorHandler);
sound.load(new URLRequest("directory/file.mp3"));
function ioErrorHandler(event:IOErrorEvent):void {
trace("IO error occurred");
}
You will need to add a listener since the URLRequest is not instantaneous. It will be very fast if you're loading from disk, but you will still need the Event-listener.
There's a good example of how to set this up (Complete with IOErrorEvent handling) in the livedocs.
try...catch only applies for errors that are thrown when that function is called. Any kind of method that involves loading stuff from the network, disk, etc will be asynchronous, that is it doesn't execute right when you call it, but instead it happens sometime shortly after you call it. In that case you DO need the addEventListener in order to catch any errors or events or to know when it's finished loading.