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Re: How to load 100,000 list view items without application freeze? Paw Jershauge31-Jan-11 9:00 Paw Jershauge 31-Jan-11 9:00  Thats Easy. just use the listview in virtual mode m8 I have some listviews with over a million entries, and my app dont freeze at all. Just remember to use cached items that also ups the preformance Heres the guideline from MSDN http://msdn.microsoft.com/en-us/library/system.windows.forms.listview.virtualmode.aspx[^] Happy codeing With great code, comes great complexity, so keep it simple stupid... Re: How to load 100,000 list view items without application freeze? Richard MacCutchan31-Jan-11 9:15 Richard MacCutchan 31-Jan-11 9:15  Which is exactly the answer I gave! I must get a clever new signature for 2011. Re: How to load 100,000 list view items without application freeze? Paw Jershauge31-Jan-11 12:18 Paw Jershauge 31-Jan-11 12:18  Didnt see m8, sry With great code, comes great complexity, so keep it simple stupid... Re: How to load 100,000 list view items without application freeze? Chesnokov Yuriy1-Feb-11 1:14 Chesnokov Yuriy 1-Feb-11 1:14  can you help with dynamic queue for logs? http://www.codeproject.com/Messages/3754435/Re-How-to-load-100-000-list-view-items-without-app.aspx[^] Чесноков Re: How to load 100,000 list view items without application freeze? Richard MacCutchan1-Feb-11 3:17 Richard MacCutchan 1-Feb-11 3:17  Sorry, but this is not something I have ever used. I would suggest you open a new question so others will see it. I must get a clever new signature for 2011. Re: How to load 100,000 list view items without application freeze? Chesnokov Yuriy31-Jan-11 10:00 Chesnokov Yuriy 31-Jan-11 10:00  you've the right answer while others complaining they can not handle 1000 lines without a bottle of Jack's http://www.codeproject.com/Messages/3753678/Re-How-to-load-100-000-list-view-items-without-app.aspx[^] millions of entries, I could not ever dream of that I hope virtual view is not so hard of coding... Чесноков Re: How to load 100,000 list view items without application freeze? Paw Jershauge31-Jan-11 12:17 Paw Jershauge 31-Jan-11 12:17  Virtual mode is very easy to use and code... just look at the guidline i gave you from microsoft, it shows you the way. But u need to know that virtual mode has its limits, with what it can do, compared to normal mode. With great code, comes great complexity, so keep it simple stupid... Re: How to load 100,000 list view items without application freeze? Chesnokov Yuriy1-Feb-11 1:10 Chesnokov Yuriy 1-Feb-11 1:10  Great, thanks, virtual mode is of value to handle large lists especially with large icons. I will use it from now for those purpouses. However I presume I will not be able to use virtual view for log event because the list with those events is not static. There are many threads which use global logger class to report events. They are stored in a queue and once queue limit exceeds some constant 100,000 previous one is dequeued. Log event addition is safe with lock. It is possible that in virtual list view between RetrieveVirtualItem() calls threads may report dozens of new events, queue will move and it will end up of showing the same or odd events several times. Чесноков Re: How to load 100,000 list view items without application freeze? Paw Jershauge1-Feb-11 8:32 Paw Jershauge 1-Feb-11 8:32  Yes and No, Virtual mode is definitely for log events, Its the fastest way of getting data out on the GUI. Just force the listview to reload the single Item when it changes But that might takes some Native calls With great code, comes great complexity, so keep it simple stupid... Re: How to load 100,000 list view items without application freeze? Paw Jershauge1-Feb-11 8:38 Paw Jershauge 1-Feb-11 8:38  Ohh and by the way its your background collection that has to change, and when it does, just reset the Virtual item count on the listview, then it will reload, all visible items (from index, to index) from the background collection. With great code, comes great complexity, so keep it simple stupid... Re: How to load 100,000 list view items without application freeze? Not Active31-Jan-11 12:18 Not Active 31-Jan-11 12:18  No you missed the point. No one was telling you they couldn't handle it, or that the controls could not support it. They have been telling you it is not a good design. And using the argument that Microsoft does it is not valid. The Event Viewer and such controls are written specifically for high performance situation in C++. You are not doing that are you? I know the language. I've read a book. - _Madmatt Re: How to load 100,000 list view items without application freeze? Member 16746131-Jan-11 23:47 Member 167461 31-Jan-11 23:47  this entire thread got way too much attention... do or do not, there is no try Re: How to load 100,000 list view items without application freeze? Chesnokov Yuriy1-Feb-11 1:12 Chesnokov Yuriy 1-Feb-11 1:12  because the topic is a challenge to display 100,000 in as little time as possible, and to find a user who may process them all Чесноков Re: How to load 100,000 list view items without application freeze? Umbaraumba31-Jan-11 23:52 Umbaraumba 31-Jan-11 23:52  The common way is to load items which are currently visible (plus some more for a buffer) and continue loading items on demand as user scrolls the list down. Re: How to load 100,000 list view items without application freeze? vsysolts31-Jan-11 23:54 vsysolts 31-Jan-11 23:54  Preload entries for viewable area and maybe a little around, then load entries only when they should be shown. Cannot specify more concrete, haven't programmed for windows for years. NEVER ever do progress bars for filling controls, this nerves a lot especially if you clicked the wrong control, always use lazy loading. Java AWT is particularly good designed for this approach Re: How to load 100,000 list view items without application freeze? reshi9991-Feb-11 0:32 reshi999 1-Feb-11 0:32  I use the telerik winforms suite for similar operations, because it can Telerik gridview Re: How to load 100,000 list view items without application freeze? franva1-Feb-11 0:55 franva 1-Feb-11 0:55  I met the similar problem. Once I wrote a program for retrieving images from a website and I want that users can be notified about the downloading process, so I added a status bar on main GUI, and let the downloading process works on the other thread(let's say B), when it is retrieving the images , the B has to report its status to GUI which is on main thread(let's say A). But B can not access the status bar which belongs to A. So there is a method call BeginInvoke(xxxx); With this method, it enables B to access resourses on A. So I think it should be the answer that you are looking for. Give me reply whatever it works or not cheers Re: How to load 100,000 list view items without application freeze? Chesnokov Yuriy1-Feb-11 1:03 Chesnokov Yuriy 1-Feb-11 1:03  You need to use background worker and report the progress with its ReportProgress() function. Чесноков Re: How to load 100,000 list view items without application freeze? Matthew Barnett1-Feb-11 1:17 Matthew Barnett 1-Feb-11 1:17  Is the code calling BeginUpdate and EndUpdate? It might make a difference, but it's still going to be slow... Re: How to load 100,000 list view items without application freeze? Chesnokov Yuriy1-Feb-11 1:24 Chesnokov Yuriy 1-Feb-11 1:24  No, I set the list view Visible to false during events addition. Otherwise the process is very slow. Чесноков Re: How to load 100,000 list view items without application freeze? loyal ginger1-Feb-11 2:36 loyal ginger 1-Feb-11 2:36  Thanks for this question. I have an application with the same problem. The answers by some smart folks here are very helpful in solving this problem. Re: How to load 100,000 list view items without application freeze? 237412-Feb-11 7:25 23741 2-Feb-11 7:25  You want a virtual listview .. How to save image in folder using c# in windows application Member 368638531-Jan-11 2:37 Member 3686385 31-Jan-11 2:37  How to save image in folder using c# in windows application Plz Reply to me Re: How to save image in folder using c# in windows application Praveen Raghuvanshi31-Jan-11 2:42 Praveen Raghuvanshi 31-Jan-11 2:42  I googled "save image in C#" and found the below link as the first one that should suffice your requirement. http://msdn.microsoft.com/en-us/library/9t4syfhh.aspx[^] You can use Image.Save on any event in the windows application. If you are looking for something specific, please elaborate. Praveen Raghuvanshi Software Developer Please Reply to me... Member 368638531-Jan-11 2:30 Member 3686385 31-Jan-11 2:30  I want to show an image on crystal report. the image is saved in database (sql) and the datatype of field is image. i saved the image by converting it (image) in binary form. Is there some way to show that image on crystal report . its an windows application. plz help me

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