c# - How do I update multiple controls on a single form in a multithreaded .NET application? -


i have form has 6 instances of usercontrol spread across 3 tabpages. each usercontrol contains checkedlistbox can contain relatively large number of items (200k+). retrieving , setting data done calling updaterecords in below code:

private void updaterecords() {     list<records> orecords = serverdataaccess.getrecords(m_sconnectionstring);      thread loadrecords1 = new thread(() => usercontrol1.records = orecords);     loadrecords1.start();      thread loadrecords2 = new thread(() => usercontrol2.records = orecords);     loadrecords2.start();      thread loadrecords3 = new thread(() => usercontrol3.records = orecords);     loadrecords3.start(); }  public list<record> records {     set     {         //make deep copy of records changes records in 1 usercontrol not affect others         addrecordstocheckedlistbox(value.asparallel().select(orecord => orecord.clone()).orderby(orecord => orecord.name).toarray());     } }  delegate void addrecordstocheckedlistboxdelegate(record[] records); private void addrecordstocheckedlistbox(record[] records) {     if (invokerequired)     {         invoke(new addrecordstocheckedlistboxdelegate(addrecordstocheckedlistbox), new object[] { records });     }     else     {         clbrecords.suspendlayout();         clbrecords.items.addrange(records);         clbrecords.resumelayout();     } }

while creating copies of arrays, cpu usage spikes 100%, expected, once threads point start updating controls data arrays, cpu usage pegged @ 50% (dual core system) due needing invoke call, creating bottleneck.

currently, loading data takes approximately 3 minutes, , benchmarking indicated @ minimum, 2:00-2:30 of time spent executing clbrecords.items.addrange(records); in addrecordstocheckedlistbox. each usercontrol functionally isolated each other, changes 1 have no impact of others, do, however, need remain on same form.

is there way load array of records each of these controls takes advantage of having multiple cores available reduce bottleneck?

updating controls on ui thread, use 1 core.

and apart that, achieve efficiency in program should not try parallellism, reducing data. e.g. not fill complete records, id, name. should sufficient ui.

probably need paging, because 200k items in checkedlistbox not user friendly.


Comments

Post a Comment

Popular posts from this blog

javascript - Jquery show_hide, what to add in order to make the page scroll to the bottom of the hidden field once button is clicked -

i have button on website when clicked, reveals map. button can seen when page first loads up, when clicked, section holding map slides open , goes out of screen since page loads @ top (normal). want page scroll down bottom of div select when button pushed, if map out of screen. if page scrolled down, , clicks show map button, don't want page jump bottom of map. i tried figure out myself, no luck. seasoned jquery coders able give me guidance? many thanks! map = mapdiv.gmap3("get"); infobox = new infobox({ pixeloffset: new google.maps.size(-220, -310), closeboxurl: '', enableeventpropagation: true }); mapdiv.delegate('.infobox .close','click',function () { infobox.close(); }); jquery(".slidingdiv").hide(); jquery(".show_hide").show(); jquery('.show_hide').click(function(){ lastcenter=map.getcenter(); jquery(".slidingdiv&quo
Read more

javascript - Highcharts multi-color line -

Image
i looking create highchart multi-colored line. if goes down under value, become red, , when comes on value, become green . here picture example: or maybe highcharts have other charts models differentiate high or low level color? you can achieve coloring using lineargradient coloring: color: { lineargradient: { x1: 0, x2: 0, y1: 0, y2: 1 }, stops: [ [0, 'red'], [0.25, 'yellow'], [0.50, 'green'], [0.75, 'yellow'], [1, 'red'] ] } here 0 in stops relates minimum value of series , 1 maximum value, , in between percentages between values. if find percentages according values prior creating chart use correct stops values make relate specific values in data (at least approximately). see this jsfiddle example .
Read more

javascript - Enter key does not work in search box -

tried search guys sorry. input in search box doesnt work (or search) when hit enter when user clicks search button. doing wrong? here code. thanks. <script type="text/javascript"> $(document).ready(function() { $("#submit").click(function() { var url = "http://asla.org/awardssearch.html"; url += "?s=" + $('#googlecse').val(); window.location = url; }); $('#googlecse').keydown(function(event) { if (event.keycode == '13') { $("#submit").click(); } else { //do nothing :) } }); }); </script> <form class="navbar-form navbar-right" role="search"> <div class="search"> <input id="googlecse" type="text" onblur="if(this.value=='')this.value=this.defaultvalue;" onfocus="if(this.value==this.defaultvalue)t
Read more