recycle | 易学教程

A process serving application pool 'App pool' suffered a fatal communication error with the Windows Process Activation Service

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问题 I have asp.net web forms application. I deployed program to IIS server and program is working well but all of users' InProc session often die at same time. I know that appliaction pool often is recycle. I instaled DebugDiagx64 program and add log this application pool. Result is that Some exception details were omitted due to the following reasons The maximum number of stacks (MAX_CLR_EXCEPTION_STACKS_PER_EXCEPTION_TYPE = 10) for this CLR exception type have been collected: 'NOT_FOUND' The

data.table efficient recycling V2

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问题 This is a follow-up to this question : data.table efficient recycling The difference here is that the number of future years for each line is not necessarily the same .. I frequently use recycling in data.table, for exemple when I need to make projections future years. I repeat my original data fro each future year. This can lead to something like that : library(data.table) dt <- data.table(1:500000, 500000:1, rpois(500000, 240)) dt2 <- dt[, c(.SD, .(year = 1:V3)), by = 1:nrow(dt) ] But I

Old items visible a while, in listview or gridview, when recycling

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问题 This is not a big issue, but it looks strange. In a list or gridview I load images with a delay (e.g. loaded from remote place). I'm recycling the items, using convertView. When I scroll down fast, I see the old images repeated, until the correct images are fetched and replace them. Is there a way to change this? I tried, for example, at the very start of getView() (after initializing convertView, if necessary), to set the imageView visibility to GONE . And set to VISIBLE after the image has

Recycle Freed Objects

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问题 suppose I need to allocate and delete object on heap frequently (of arbitrary size), is there any performance benefit if instead of deleting those objects, I will return it back to some "pool" to be reused later? would it give benefit by reduce heap allocation/deallocation?, or it will be slower compared to memory allocator performance, since the "pool" need to manage a dynamic collection of pointers. my use case: suppose I create a queue container based on linked list, and each node of that

Android - Listview/Gridview item selection with scrolling

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问题 I am new to android and I have just started programming a simple app to try different things out. I was programming a ListView (and, in the same way a GridView) but there is something I got wrong. Each item is a couple of an image and a text field. | img | __text__ | I want to be able to choose any number of list items, keeping them enlightened for all the selection process, before passing the selected items to the next activity. If I want to de-select one of them, I simply have to re-click

How to stop ListView recycling?

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问题 I'm an Android beginner and I can't figure out why this is happening. Activity Screenshot: Everything works fine except when I scroll down (hence why I think it has to do with recycling)... So when I scroll back up and attempt to undo the vote (red arrow) on the first post, it thinks the post is voted down! Alternatively, it may also think the down-vote ImageButton drawable is empty - see code). If I don't scroll, it works perfectly. getView code: public View getView(int position, View

How to make RecyclerView do recycling inside NestedScrollView?

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问题 I tried to put several views, including RecyclerView , into a NestedScrollView . I used setNestedScrollingEnabled(false) and it looked nice for small data sets but started to be laggy for bigger ones. After spending some time on logging the onCreateViewHolder() method I understood that the recycler view creates them all at once as the old ListView . I tried to find reasons of such behavior in RecyclerView docs, but I found it in ScrollView description: You should never use a ScrollView with a

Does Windows 7 recycle process id (PID) numbers?

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问题 I have this little test proggy that tracks PID's as they are created and shut down. I am investigating a problem that my proggy has found and would like to ask you about this in order to have a better idea on what's going on. When a windows process is started, it gets a PID but when the process is shut down, does the PID become retired (like a star basketballer's jersey number) or is it possible for a new, entirely unrelated, process to be created under that released PID? Thanks 回答1: Yes,

Android - Listview/Gridview item selection with scrolling

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I am new to android and I have just started programming a simple app to try different things out. I was programming a ListView (and, in the same way a GridView) but there is something I got wrong. Each item is a couple of an image and a text field. | img | __text__ | I want to be able to choose any number of list items, keeping them enlightened for all the selection process, before passing the selected items to the next activity. If I want to de-select one of them, I simply have to re-click on the item to have the selection disappear. For this purpose I use a custom selector so that when the

ListView Virtualization value repeating in Recycling Mode

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I have a strange problem with virtualization enabled ListView control. I created a very small pilot app to reproduce the issue. When I type-in something for a few textboxes in the listview and then scrolling down, after a few pages the typed-in values are repeating in the untouched textboxes below. Here is the XAML of the window: <Window x:Class="WpfApplication3.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525"> <Grid Name="mainGrid"> <ListView ItemsSource="{Binding