c# - What is the rationale behind the (probably undocumented) cases of .NET suppressing exceptions? -


i trying grasp the .net criterion where, when .net exceptions suppressed, swallowed or passed unnoticed in order detect/suspect/prevent/be on alert such incidents.

the msdn online article "timer class" on .net framework 4.5 states:

in .net framework version 2.0 , earlier, timer component catches , suppresses exceptions thrown event handlers elapsed event. behavior subject change in future releases of .net framework

hmmm, .net 4.5 future release in relation .net 2.0?
though rhetorical question , not care specific case mentioned in docs.

what care , want understand is:
criterion, principles , rationale according .net exceptions being suppressed?

update (in response eugen rieck's answer:

so question is: thread should subject exception thrown on timer tick?

citing msdn article "exception handling (task parallel library)" :

if not wait on task propagates exception, or access exception property, exception escalated according .net exception policy when task garbage-collected.

(funny ".net exception policy" not find anywhere ...)

well, interested in wpf app, which, understand, sta , has 1 main parent thread.
wish crashes if exception unhandled.

update2 (in response matt smith' comment):

yes, know. citing <throwunobservedtaskexceptions> element:

if exception associated task has not been observed, there no wait operation, parent not attached, , taskexception property not read task exception considered unobserved.

in .net framework 4, default, if task has unobserved exception garbage collected, finalizer throws exception , terminates process. termination of process determined timing of garbage collection , finalization.

to make easier developers write asynchronous code based on tasks, .net framework 4.5 changes default behavior unobserved exceptions. unobserved exceptions still cause unobservedtaskexception event raised, default, process not terminate. instead, exception ignored after event raised, regardless of whether event handler observes exception.

in .net framework 4.5, can use element in application configuration file enable .net framework 4 behavior of throwing exception.

i skipped go further on avoid bloafing of question , getting reference explanation stephen toub's "task exception handling in .net 4.5"

the question after (really wanted start question) make sure me :

here's link policy (it changed in .net 2.0) , has remained same since then: http://msdn.microsoft.com/en-us/library/ms228965.aspx


Comments

Post a Comment

Popular posts from this blog

SPSS keyboard combination alters encoding -

my question not have programming practical issue on spss. accident keyword combination cannot remember because did not intend press changed encoding in spss , text in data in different language english shown small boxes. nevertheless, when kind of analysis performed different language text shown in output. does know reason? tried change encoding did not produce result. first, @ edit > options , see whether setting unicode or locale. might fix it. if have text in multiple languages, want unicode. otherwise, may have specific locale set wrong. can change set locale, need know locale want use.
Read more

Add new record to the table by click on the button in Microsoft Access -

in ms access form want implement separate button, adds new record table. in order added button , attached button event: private sub btnaddrec_click() refresh codecontextobject on error resume next docmd.gotorecord , , acnewrec if err.number <> 0 btnaddrec.enabled = false end if end end sub everything ok when open window , click btnaddrec button, problem when first of perform navigation through existed records , after click on button. got runtime error: 2105: «you can't go specified record. may @ end of recordset» . how solve issue, need have ability add new record on click on specific button, no matter, have walked or not walked through records before. thanks. i created simple form field call description (and autonumber) , created button code follows click event. filled number of records , navigated through them, clicked addnewrec button. form navigated new record without issues. able click addnewrec button directly after ...
Read more

CSS3 Transition to highlight new elements created in JQuery -

i want use css3 color transition apply highlight-fading color effect (yellow transparent) new elements appended markup using jquery. css #content div { background-color:transparent; -moz-transition:background-color 2s; -webkit-transition:background-color 2s; -o-transition:background-color 2s; transition:background-color 2s; } #content div.new { background-color:yellow; } html <div id="content"></div> <a id="add-element" href="#">add new element</a> js $('#add-element').click(function() { var newelement = $('<div class="new">new element</div>'); $('#content').append(newelement); newelement.removeclass('new'); }); when click link, new element created. class "new" (background color yellow) , it's appended html markup. should able remove "new" class trigger background color transition transparent (or whate...
Read more