vb.net - How does the ProgressBar.PerformStep() function work? -


i'm quite confused progress bar in vb.net, here code

private sub form1_load(byval sender system.object, byval e system.eventargs) handles mybase.load     progressbar_my.minimum = 0     progressbar_my.maximum = 10     progressbar_my.step = 1 end sub  private sub button1_click(byval sender system.object, byval e system.eventargs) handles button1.click      progressbar_my.performstep()     threading.thread.sleep(5000)     if 1 = 1         progressbar_my.performstep()         progressbar_my.performstep()     end if      'threading.thread.sleep(2000)  end sub

for above code, expected after click button1, progress bar increase progress status 1, pause 5 sec, increase progress status 2 @ once.

however, after ran above code, saw after click button1, progress bar increase 3 continually after 5 sec.

can tell me why behaves , how should program code can increase 1, pause 5 sec , increase 2?

thanks in advance!

i think seeing (or not seeing) fact progress bar takes finite amount of time advance each step.

when call threading.thread.sleep on ui thread stops progress bar being redrawn until after sleep

what should update progress bar on background worker instead, think see effect desire.

add backgroundworker form

change button click code start worker:

private sub frmso_load(sender object, e eventargs) handles mybase.load     progressbar_my.minimum = 0     progressbar_my.maximum = 10     progressbar_my.step = 1 end sub  private sub button1_click(byval sender system.object, byval e system.eventargs) handles button1.click     backgroundworker1.runworkerasync end sub

then perform update in dowork event:

'define delegate handle updates ui thread private delegate sub performstepcallback()  private sub backgroundworker1_dowork(sender object, e system.componentmodel.doworkeventargs) handles backgroundworker1.dowork     dim cb performstepcallback = addressof progressbar_my.performstep     me.begininvoke(cb)     threading.thread.sleep(5000)     me.begininvoke(cb)     me.begininvoke(cb) end sub

Comments

Post a Comment

Popular posts from this blog

Android layout hidden on keyboard show -

i have strange problem layout. when tap on edittext , keyboard shown edittext stay on bottom , when tap on to hide keyboard , keyboard hides , edittext go should when want input text. when tap again, keyboard shown , edittext goes down behind keyboard... <relativelayout android:layout_width="match_parent" android:layout_height="match_parent" > <scrollview android:layout_width="match_parent" android:layout_height="fill_parent" android:above="@+id/rl_commands"> <textview android:layout_width="match_parent" android:layout_height="wrap_content"/> </scrollview> <relativelayout android:layout_width="match_parent android:layout_height="24dp" android:id="@+id/rl_commands" android:alignparentbottom="true">
Read more

google app engine - 403 Forbidden POST - Flask WTForms -

i have flask application running on google app engine. trying submit form built using wtform , keep getting following error. 403 forbidden: don't have permission access requested resource. either read-protected or not readable server. location.html (part of code) <form method=post action="/home/location"> .... <button type="submit" class="btn btn-primary" value="submit"> directions </button> </form> main.py @app.route('/home/location', methods=['post', 'get']) def location(): form = cfcdirections.direction(request.form) print(request.method) if request.method == 'post' , form.validate(): print("after if") directions = cfcdirections() street_no = directions.no street = directions.street suburb = directions.suburb postcode = directions.postcode
Read more

c - Why would PK11_GenerateRandom() return an error -8023? -

i looking through internet trying find source of pk11_generaterandom() function see why function fail. have program uses function when moved new flavor of linux, fails after forking ( fork() ) since not believe there problem nss, suspect doing incorrectly disregarded in older versions of linux new 1 there issue. the openssl package same on 'good' , 'bad' server: openssl 0.9.8e-fips-rhel5 01 jul nss rpm differs though. 'good' has nss-3.12.2.0-2.el5 and bas has version nss-3.15.3-4.el5_10 the 'good' server uses quite obsolete linux: linux 2.6.18-128.el5 #1 smp wed jan 21 08:45:05 est 2009 x86_64 x86_64 x86_64 gnu/linux enterprise linux enterprise linux server release 5.3 (carthage) red hat enterprise linux server release 5.3 (tikanga) the 'bad' server newer: linux bad 2.6.18-371.4.1.el5 #1 smp wed jan 29 11:05:49 pst 2014 x86_64 x86_64 x86_64 gnu/linux oracle linux server release 5.10 red hat enterprise linux server release
Read more