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• Quickly retrieve the subset of properties used in a huge collection in C#

  - by ccornet

  I have a huge Collection (which I can cast as an enumerable using OfType<()) of objects. Each of these objects has a Category property, which is drawn from a list somewhere else in the application. This Collection can reach sizes of hundreds of items, but it is possible that only, say, 6/30 of the possible Categories are actually used. What is the fastest method to find these 6 Categories? The size of the huge Collection discourages me from just iterating across the entire thing and returning all unique values, so is there a faster method of accomplishing this? Ideally I'd collect the categories into a List.

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• How to implement a lazy loaded Silverlight data grid without using paging

  - by Marc Wittke

  Using the Business Application template from the brand new released RIA Services, you can see lots of examples using the data grid on top of a DomainDataSource in combination with a DataPager. The properties PageSize and LoadSize can be used to adjust the amount of data to be displayed in one page and the data that is prefetched in the background. Now I'd like to have a data grid with a scrollbar and no pager. The underlying DomainDataSource should load only the data that is diplayed in the grid. It should trigger another load, when the user scrolls down to items that are not yet in the data context. Is there any sample implementation how to do this?

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• importing CELERY* environment variables in django settings.py causes celeryd not to start

  - by Taras

  I just spent 2 hours trying to figure out why django celery stopped working. Celery would being to start, but would stop short of printing out the configuration items, implying that it wasn't starting correct. The log would only contain The celery.decorators module along with the magic keyword arguments, are deprecated, and will be removed in version 3.0. Please use the celery.task module instead of celery.decorators, and the task.request should be used instead of the magic keyword arguments: from celery.task import task See http://bit.ly/celery22major for more information. """)) It turns out that some celery env variables that I was importing to try and fix a different problem were causing celery not to start correctly: from celery.tests.config import CELERY_QUEUES, CELERY_DEFAULT_QUEUE, CELERY_DEFAULT_ROUTING_KEY Even though I wasn't using them anywhere. Does anyone know what was happening?

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• Using *.html extension in dynamic UR's for SEO

  - by lostaman

  Hi all My situation is. I have a project planned to be built on ASP.NET MVC 2. And one of the major requirements is SEO optimization. A customer wants to use static-like URLs that end up with .html extension for this project that make URLs more SEO friendly. E.g. "mysite.com/about.html " or "mysite.com/items/getitem/5.html" etc. I wonder is there any benefit from SEO perspective to use .html extension in dynamic URLs? Are Google and other search engines rank work better with such URLs?

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• Use a push button to add a section in an InfoPath form?

  - by Alex

  I'm working on an InfoPath form that's going to be run with InfoPath Forms Services on a SharePoint server. For a number of reasons -- mostly so that the customer can update the form without involving an administrator -- this can't be a form containing .NET code. The form has a repeating group, and we have users who are a bit confused as to how to add and delete items from the repeating section. I've looked all over the Internets, but haven't been able to find a way to do this without adding a code project to the form. Is there any way to write a rule or do something else to make a button that adds an item to a repeating section?

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• DDD: Trying to code sorting and filtering as it pertains to Poco, Repository, DTO, and DAO using C#?

  - by Dr. Zim

  I get a list of items from my Repository. Now I need to sort and filter them, which I believe would be done in the Repository for efficiency. I think there would be two ways of doing this in a DDD way: Send a filter and a sort object full of conditions to the Repository (What is this called)? Repository result would produce an object with .filter and .sort methods? (This wouldn't be a POJO/POCO because it contains more than one object?). So is the answer 1, 2, or other? Could you explain why? I am leaning toward #1 because the Repository would be able to only send the data I want (or will #2 be able to delay accessing data like a LazyList?) A code example (or website link) would be very helpful. Example: Product product = repo.GetProducts(mySortObject, myFilterObject); // List of Poco product.AddFilter("price", "lessThan", "3.99"); product.AddSort("price", "descending");

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• Flex 4.6 Mobile - Scrolling to the last added item in a dataGrid with variableRowHeight

  - by user1305331

  I'm trying to set the scroll vertical position of a spark dataGrid to show the items as I add them to the grid. I know you can set the scroll position like this: dataGrid.scroller.viewport.verticalScrollPosition = itemPosition*rowHeight; The problem is that the dataGrid have variableRowHeight, as each row word wraps their name labels, and I don't know how to get each row height. I though of getting the itemRenderer associated with every item as I add it to the grid, and keep the total row height value in a variable, but don't know how to achieve that. Is there any way to set the scroll position of a dataGrid with variableRowHeight to show the last added item?

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• C# huge size 2-dim arrays

  - by 4eburek

  I need to declare square matrices in C# WinForms with more than 20000 items in a row. I read about 2GB .Net object size limit in 32bit and also the same case in 64bit OS. So as I understood the single answer - is using unsafe code or separate library built withing C++ compiler. The problem for me is worth because ushort[20000,20000] is smaller then 2GB but actually I cannot allocate even 700MB of memory. My limit is 650MB and I don't understand why - I have 32bit WinXP with 3GB of memory. I tried to use Marshal.AllocHGlobal(700<<20) but it throws OutOfMemoryException, GC.GetTotalMemory returns 4.5MB before trying to allocate memory. I found only that many people say use unsafe code but I cannot find example of how to declare 2-dim array in heap (any stack can't keep so huge amount of data) and how to work with it using pointers. Is it pure C++ code inside of unsafe{} brackets? Could you please provide a small example of working with matrices using pointers in unsafe code.

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• How set opacity on QGraphicsItem

  - by La Chamelle

  Hello, i have a inherited from QGraphicsScene and QGraphicsItem to create my own classes. I use Qt 4.6. I want to set a specific opacity on each items of my scene. I use setOpacity : setOpacity method, but its not the result i hope. I want to have for example one item opaque and an other transparent (to see the desktop, or the other application). But if i dont set the opacity of the QGraphicsView to 0.5, i have not the transparancy. And if the QGraphicsView is set to 0.5, the item is not real opaque. What should i do ? Thanks you.

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• getElementsByTagName problem in chrome and safari

  - by Ilian Iliev

  I`m parsing a Google Maps RSS with javascript and using the following code to get the point coordinates: point_coords = items.getElementsByTagName('georss:point') Unfortunately it works in FF but not in safari and chrome (still not tested in Opera and IE) The XML looks like: <item> <guid isPermaLink="false">guidNo</guid> <pubDate>Mon, 23 Mar 2009 20:16:41 +0000</pubDate> <title>title text</title> <description><![CDATA[text]]></description> <author>UniCreditBulbank</author> <georss:point> 42.732342 23.296659 </georss:point> </item>

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• Moving ordered elements and adding arbitrary text in Deliverance

  - by Jon Hadley

  Using the following XPath derived rule, I am able to select a list of events from a Plone site (similar to Plone Community events) and display them in my Deliverance themed site: <replace content="//*[@id='parent-fieldname-title' or @class='explain' or @id='parent-fieldname-location' or @id='parent-fieldname-text']" theme="#center-content-to-replace-one" /> However, two separate, but related, problems now rear their heads. I can't work out how to: Re-order elements within the replaced theme, such as moving images originally held within #parent-fieldname-text to before #parent-fieldname-title Put arbitrary text before elements. Such as 'Page Title:' before #parent-fieldname-title I could do both if I was just dealing with one record, as place holders(1) or text before place holders(2) could be specified in the template - but I can't see a away for that template behaviour to repeat across multiple items in one page. (if that is indeed the solution) Is this a job for pyQuery?

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• Refresh a control on the master page after postback

  - by Andreas

  Hi all! What i am trying to do here is to show a couple of validation messages in form of a bulletlist, so i have a Div on my master page containing a asp:bulletlist. Like this: <div> <asp:BulletedList ID="blstValidationErrorMessage" runat="server" BulletStyle="Disc"> </asp:BulletedList> </div> When i then click the Save button from any of my pages (inside the main contentPlaceHolder) i create a list of messages and give this list as datasouce like this: blstValidationErrorMessage.DataSource = validationMessageCollection; blstValidationErrorMessage.DataBind(); The save button is located inside an updatepanel: asp:UpdatePanel runat="server" ID="UpdatePanel" ChildrenAsTriggers="true" UpdateMode="Conditional" Nothing happens, i can see that the datasource of the bulletlist contains X items, the problems must arise because the Save button is inside an update panel and the elements outside this updatepanel (master page controls for example) is not refreshed. So my question is, how do i make the bulletlist refresh after the postback? Thanks in advance.

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• C# Converter difficulties

  - by Petr

  Hi, I am trying to fill object[] with List<string> but I cannot figure out how to use ConvertAll. MSDN did not help me. At first I tried to create an instance of Converter but it looks like it expects delegate? Converter<string, object> conv = new Converter<string, object>(??); //why delegate? this.comboBox1.Items.AddRange(Form1.AnimalType.ConvertAll<object>(conv)); Thanks :)

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• iPhone addition to already localized nibs

  - by user168610

  I've submitted an app to the store that has been localised into a number of languages. Now it's time to update a few things, so I've added a few new components to a xib or two and modify them as IBOutlets from my code. All works great in English, but when I change to a different language it appears that my nib additions haven't been propagated through the localised nibs that already existed. (I get an unrecognised selector on a UILabel I've added). What is the correct workflow for adding new items to an already localised nib? Should a modification to the top level .xib carry through to all localised versions? Or should I unlocalize, add new components and then localise all over again? Many thanks, Bryn

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• Will news ticker using overflow:hidden cause Google to see site as spam?

  - by molipix

  In the hope of tempting Googlebot with fresh content, I've implemented a homepage news ticker which displays the 20 most recent headlines on our site. The implementation I have chosen is a <ul> with each headline being a <li> Initially all the <li> elements have no style but Javascript kicks in on page load and gives all but one of them a display="style:none" attribute. Javascript then displays each of the other 19 headlines in a loop. So far so good. However, in order to prevent a visually unplesant page load where the 20 items display and then immediately collapse, I am using overflow:hidden on the <ul> element. Anyone got a view on what Googlebot is likely to make of this? Does the fact that I'm using overflow:hidden make the content look like spam?

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• Algorithm - combine multiple lists, resulting in unique list and retaining order

  - by hitch

  I want to combine multiple lists of items into a single list, retaining the overall order requirements. i.e.: 1: A C E 2: D E 3: B A D result: B A C D E above, starting with list 1, we have ACE, we then know that D must come before E, and from list 3, we know that B must come before A, and D must come after B and A. If there are conflicting orderings, the first ordering should be used. i.e. 1: A C E 2: B D E 3: F D result: A C B D E F 3 conflicts with 2, therefore requirements for 2 will be used. If ordering requirements mean an item must come before or after another, it doesn't matter if it comes immediately before or after, or at the start or end of the list, as long as overall ordering is maintained. This is being developed using VB.Net, so a LINQy solution (or any .Net solution) would be nice - otherwise pointers for an approach would be good.

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• SimpleXML adding html into Hash tree

  - by Miriam Raphael Roberts

  Question: I have an xml file that I am pulling from the web and parsing. One of the items in the xml is a 'content' value that has HTML. I am using SimpleXML/XMLin to parse the file like so: $xml= eval { $data-XMLin($xmldata, forcearray = 1, suppressempty= +'') }; When I use Dumper to dump the hash, I dsicovered that SimpleXML is parsing the HTML into the hash tree. 'content' => { 'div' => [ { 'xmlns' => 'http://www.w3.org/1999/xhtml', 'p' => [ { 'a' => [ { 'href' => 'http://miamiherald.typepad.com/.a/6a00d83451b26169e20133ec6f4491970b-pi', 'style' => 'FLOAT: left', 'img' => [ etc..... This is not what I want. I want to just grab content inside of this entry. How do I do this?

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• Pass CSS property dynamically from panelgrid

  - by Bernad Ali

  I have a hidden property which is fetched from ebean. how do i pass that color code property to css function? <h:panelGrid id="testpanel" columns="#{message.no_of_columns}" rows="#{message.no_of_rows}" styleClass="dynamicGrid"> <c:forEach items="#{bLDashBoardAction.listBondLoc}" var="item"> <h:panelGroup> <h:outputText value="#{item.rackTagCode}" /> <h:hiddenInput value="#{item.colorEBean.colorCode};" /> </h:panelGroup> </c:forEach> </h:panelGrid> this is my css property,background need to be assigned from panelgrid colorcode .dynamicGrid td { width: 50px; height: 50px; border: 4px solid gray; background: }

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• browser back acts on nested iframe before the page itself - is there a way to avoid it??

  - by kfiroo

  hi, i have a page with dynamic data loaded by some ajax and lots of javascript. the page contains a list from which the user can choose and each selected value loads new data to the page. one of these data items is a url provided to an iframe. i use jQuery BBQ: Back Button & Query Library to simulate the browser-back behavior. all works well besides the fact that when i click the back button for the first time the iframe goes back to its previous location and then i need to click back again to make the page go back. is there a way to disable the iframe's back behavior?

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• How do I hide data/field in a List in J2ME

  - by pi

  Hi, I am working on a J2ME app which has dynamically generated Lists. Items on this list may be consequently selected, and the selection processed within the commandAction block. Is there a way to have the IDs of variables populating the List (from a remote database) included in the List item definition as in: this.append("A", null); this.append("B", null); or: String[] arrayOfValues = {"A", "B"}; new List("Menu", List.IMPLICIT, arrayOfValues, null); such that when an item is selected, perhaps A, I can also have its database ID for perhaps further processing. Is it possible to hide a field/data? Thanks.

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• Why does C# not implement GetHashCode for Collections?

  - by Peterdk

  I am porting something from Java to C#. In Java the hashcode of a ArrayList depends on the items in it. In C# I always get the same hashcode from a List... Why is this? For some of my objects the hashcode needs to be different because the objects in their list property make the objects non-equal. I would expect that a hashcode is always unique for the object's state and only equals another hashcode when the object is equal. Am I wrong?

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• Facebook Graph - does the user "like" my page?

  - by Ican Zilb

  I am trying to upgrade my iPhone app to use the new facebook graph api. One thing I cannot find is how to find out if the current user connected from my app to facebook is a fan of my facebook page - (i.e. in the new paradigm - whether the user likes my page) In the Rest Api there was a function isFan, but not in the Graph. I can get all items the user likes and search whether one of them is my page, but certainly there must be an easier way instead of going trough thousands of records each time I must check whether he is a fan, right? If someone already figured it out how to do that from their new docs, I'll really appreciate if you share it with me.

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• Process for linking static ObjC libraries in XCode

  - by madmik3

  I'm trying to link to a static library and I keep getting linker errors. I've found a few sites that post examples but I have not been able to see what I am doing wrong. First I create a project that will link to my lib add existing files find my .xcodeproj file select "Copy items into destination groups folder"... Select my host project as Add To Targets. Then I add a direct dependency to my host app expand targets double click MyHost.app click + under direct dependencies select my lib Then I set build flags double click MyHost application icon in Groups and Files. click the build tab then I set the OtherLinerFlag to -ObjC then I set Header Search Paths to my header file location for my static library. I pass the compile stage but any classes in my static lib cause linker error: literal-pointer@_OBJC@_cls_refs@SomeClass in MyHost.o thanks!

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• jQuery: Preventing list scroll?

  - by Legend

  I have this scenario: Using an ajax query I fetch some data items and push them into a ul element as an li element. I use $("ulele").append(new_li_item). I wrote my own custom scroll for this ul element using the following whenever an event is detected: $("ulele").animate({scrollTop: '+=' + 200}, 'slow'); The problem is when I fire that event and the list scrolls due to the animate function above, I want to keep it stable for at least a few seconds. When it scrolls down, elements are still being pushed so the list keeps scrolling no matter what. Is there a way I can pause this from happening without really stopping the activity of pushing elements into the ul list?

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• basic question with a dtd

  - by voodoomsr

  i need an element with the characteristics <!ELEMENT section ((comment*)|definition|(comment*))> but that is ambiguous, i get the next message in visual studio Multiple definition of element 'comment' causes the content model to become ambiguous. A content model must be formed such that during validation of an element information item sequence, the particle contained directly, indirectly or implicitly therein with which to attempt to validate each item in the sequence in turn can be uniquely determined without examining the content or attributes of that item, and without any information about the items in the remainder of the sequence. So how can i write correctly that? the correct structure is one definition surrounded by possibles comments elements.

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