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  • IQueryable and lazy loading

    - by Nelson
    I'm having a hard time determining the best way to handle this... With Entity Framework (and L2S), LINQ queries return IQueryable. I have read various opinions on whether the DAL/BLL should return IQueryable, IEnumerable or IList. Assuming we go with IList, then the query is run immediately and that control is not passed on to the next layer. This makes it easier to unit test, etc. You lose the ability to refine the query at higher levels, but you could simply create another method that allows you to refine the query and still return IList. And there are many more pros/cons. So far so good. Now comes Entity Framework and lazy loading. I am using POCO objects with proxies in .NET 4/VS 2010. In the presentation layer I do: foreach (Order order in bll.GetOrders()) { foreach (OrderLine orderLine in order.OrderLines) { // Do something } } In this case, GetOrders() returns IList so it executes immediately before returning to the PL. But in the next foreach, you have lazy loading which executes multiple SQL queries as it gets all the OrderLines. So basically, the PL is running SQL queries "on demand" in the wrong layer. Is there any sensible way to avoid this? I could turn lazy loading off, but then what's the point of having this "feature" that everyone was complaining EF1 didn't have? And I'll admit it is very useful in many scenarios. So I see several options: Somehow remove all associations in the entities and add methods to return them. This goes against the default EF behavior/code generation and makes it harder to do some composite (multiple entity) LINQ queries. It seems like a step backwards. I vote no. If we have lazy loading anyway which makes it hard to unit test, then go all the way and return IQueryable. You'll have more control farther up the layers. I still don't think this is a good option because IQueryable ties you to L2S, L2E, or your own full implementation of IQueryable. Lazy loading may run queries "on demand", but doesn't tie you to any specific interface. I vote no. Turn off lazy loading. You'll have to handle your associations manually. This could be with eager loading's .Include(). I vote yes in some specific cases. Keep IList and lazy loading. I vote yes in many cases, only due to the troubles with the others. Any other options or suggestions? I haven't found an option that really convinces me.

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  • Open source, programmable online video player available?

    - by JB
    I got this great idea that I'm thinking about implementing, but before I go into the deep end I wanted to get a clue about what options I have. I'm looking for an open source, programmable video player. Must: Play video files from a user's computer not a server Connect to a server to retrieve/send info (not limited to file xfer) Prefer: Web-based player Easily programmable (because i'm no pro at programming <; Any names of open-source programs or players that you guys think I could use? Any help is really appreciated

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  • KVO on the "windows" value of UIApplication?

    - by Ariel Malka
    The following is not working: [[UIApplication sharedApplication] addObserver:self forKeyPath:@"windows" options:(NSKeyValueObservingOptionNew|NSKeyValueObservingOptionOld) context:NULL]; Together with that, on the Observer side: - (void) observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context { NSLog(@"never reached!"); } Any clues? N.B. My uber-goal is to get a notification when a (system-generated) UIAlertView is shown.

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  • one page has 9 urls. I am looking for 301 auto redirect syntax for multiple urls.

    - by Ali Demirtas
    Hi This is the third time I am asking this question. I am only looking for the syntax of how to solve this problem. I am using prestashop as the cart for my website. I have a problem; the website used to be in dynamic urls. I enabled friendly url writing. The problem is that one page has more than one url. You can access a same page from the dynamic url and static url. In fact a single page has 9 different urls. This obviously creates problems for seo as search engines penalize my website for this. Here are examples of a page with more than 2 urls (http://www.turkishfootballstore.com/lang-nl/product.php?id_product=515) (http://www.turkishfootballstore.com/fenerbahce/515-fenerbahce-thuisshirt-20092010.html) (http://www.turkishfootballstore.com/lang-nl/fenerbahce/515-fenerbahce-thuisshirt-20092010.html) you can see even the static url's have 2 one with language defined and the other without. out fo the three urls above the correct one is the one at the bottom. What can I do to solve this problem? I have no knowledge of programming. Here is the htaccess for the website. Any sample code or help is really appreciated. There is 550 pages and every page is published in 17 different languages I want to use a 301 auto redirect. What is the simplest way to do it? Please only reply if you have the coding for a auto 301 redirect! URL rewriting module activation RewriteEngine on URL rewriting rules RewriteRule ^([a-z0-9]+)-([a-z0-9]+)(-[_a-zA-Z0-9-]*)/([_a-zA-Z0-9-]*).jpg$ /img/p/$1-$2$3.jpg [L,E] RewriteRule ^([0-9]+)-([0-9]+)/([_a-zA-Z0-9-]*).jpg$ /img/p/$1-$2.jpg [L,E] RewriteRule ^([0-9]+)(-[_a-zA-Z0-9-]*)/([_a-zA-Z0-9-]).jpg$ /img/c/$1$2.jpg [L,E] RewriteRule ^lang-([a-z]{2})/([a-zA-Z0-9-])/([0-9]+)-([a-zA-Z0-9-]).html(.)$ /product.php?id_product=$3&isolang=$1$5 [L,E] RewriteRule ^lang-([a-z]{2})/([0-9]+)-([a-zA-Z0-9-]).html(.)$ /product.php?id_product=$2&isolang=$1$4 [L,E] RewriteRule ^lang-([a-z]{2})/([0-9]+)-([a-zA-Z0-9-])(.)$ /category.php?id_category=$2&isolang=$1 [QSA,L,E] RewriteRule ^([a-zA-Z0-9-])/([0-9]+)-([a-zA-Z0-9-]).html(.*)$ /product.php?id_product=$2$4 [L,E] RewriteRule ^([0-9]+)-([a-zA-Z0-9-]).html(.)$ /product.php?id_product=$1$3 [L,E] RewriteRule ^([0-9]+)-([a-zA-Z0-9-])(.)$ /category.php?id_category=$1 [QSA,L,E] RewriteRule ^content/([0-9]+)-([a-zA-Z0-9-])(.)$ /cms.php?id_cms=$1 [QSA,L,E] RewriteRule ^([0-9]+)__([a-zA-Z0-9-])(.)$ /supplier.php?id_supplier=$1$3 [QSA,L,E] RewriteRule ^([0-9]+)_([a-zA-Z0-9-])(.)$ /manufacturer.php?id_manufacturer=$1$3 [QSA,L,E] RewriteRule ^lang-([a-z]{2})/(.*)$ /$2?isolang=$1 [QSA,L,E] Catch 404 errors ErrorDocument 404 /404.php Options +FollowSymLinks RewriteEngine on RewriteCond %{HTTP_HOST} ^.com [NC] RewriteRule ^(.)$ http://www.*.com/$1 [L,R=301] Options +FollowSymLinks RewriteEngine on index.php to / RewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /.index.php\ HTTP/ RewriteRule ^(.)index.php$ /$1 [R=301,L] Header set Cache-Control: "no-store, no-cache, must-revalidate, pre-check=0, post-check=0, max-age=0"

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  • Instance variables vs. class variables in Python

    - by deamon
    I have Python classes, of which I need only one instance at runtime, so it would be sufficient to have the attributes only once per class and not per instance. If there would be more than one instance (what won't happen), all instance should have the same configuration. I wonder which of the following options would be better or more "idiomatic" Python. Class variables: MyController(Controller): path = "something/" childs = [AController, BController] def action(request): pass Instance ariables: MyController(Controller): def __init__(self): self.path = "something/" self.childs = [AController, BController] def action(self, request): pass

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  • Emulate disk IO speeds in Android SDK

    - by Ben L.
    I don't have a physical Android device to work with, so all I can use is the emulator. I'm wondering if there's something I could use to make the IO speeds more realistic - How do I slow down disk access to the speed it would be on a physical device? Also, this may be unrelated, but when I change the speed and latency options in Eclipse ADT DDMS view, I don't notice any change in internet speed on the emulator. Is this a bug?

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  • Receiving Error: SELF_SIGNED_CERT_IN_CHAIN when running phonegap command

    - by Jeff Schwartz
    I execute the following command: phonegap create hello com.example.hello HelloWorld and receive the following: [phonegap] missing library com.example.hello/www/3.4.0 [phonegap] downloading https://github.com/phonegap/phonegap-app-hello-world/archive/3.4.0.tar.gz... [phonegap] the options /Users/schwartzj/Documents/developer/phonegap/hello com.example.hello HelloWorld [Error: SELF_SIGNED_CERT_IN_CHAIN] [error] SELF_SIGNED_CERT_IN_CHAIN Has anyone out there encountered this problem? I received the same error when first attempting to install phone gap, but I was able to resolve it then.

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  • Dynamic pages and controls with Asp .NET

    - by Abhilash
    Hi, We are starting with the design of an ASP .NET Web UI using WCSF as the UI FW. We are evaluating some FW which will allow us to build dynamic pages, dynamic as in, deciding at runtime what user controls will be displayed and in what order. Also possibly, the pages and order in which they will be displayed. We are looking at Page Flow Application Block, but there's limited documentation around it, we were interested in knowing what other options could be considered. Thanks for your help guys...

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  • Visual studio 2010: cannot connect for any online resource

    - by KentZhou
    Visual studio 2010 Premium installed on Widnows 7: when try to connect for online gallery or online template, give me error like: Cannot search for online exensions because an error occured while trying to contact the server and ask me enable access to extensions on the vistual studio gallery .... It did enabled in Extension Manager Tools/Options page. Internet connection was fine. Can't know why. On another computer: Windows 7, VS2010 utilmate trail version: this was fine.

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  • onselect in one combo it changes data dynamically in other combo?

    - by ajay
    Hello sir I am new to the jsp and ajax world. my problem is If i select one combo option then it should change the other combo options dynamically without submit button press. for example if i select the country then it should shows their states in other combo. I am using servlet & JSP and MS-ACCESS as backend. please reply as soon as possible. THANKING YOU....

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  • Where is the IMAP support in the .NET Framework?

    - by strakastroukas
    One year ago Mitchel Sellers had a related question... I would like to access the Google IMAP for sending and receiving email messages within my custom application. The point is that i would not like to use any third party controls. Newer versions of the .Net Framework support IMAP? What options do i have?

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  • Localization and JQuery/JavaScript

    - by vikp
    Hi, I'm working on different language packs for my web app. Some of the output is generated by the JavaScript/JQuery and I can't use .aspx.resx resource files within the JavaScript. What options do I have in order to localize output produced by the client? Thanky you

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  • How to debug hanging main thread in Delphi application

    - by Harriv
    Hi, I've written application in Delphi 2007, which some times hangs (not even every week, application is running 24/7). It looks like main thread gets stuck. What are the options to pinpoint the cause for this problem? Application is written in Delphi 2007, it uses RemObjects, DBExpress with Firebird, OPC communication using COM.

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  • Generic IBindingListView Implementations

    - by Brad Leach
    Can anyone suggest a good implementation of a generic collection class that implements the IBindingListView & IBindingList interfaces and provides Filtering and Searching capabilities? I see my current options as: Using a class that someone else has written and tested Inheriting from BindingList, and implementing the IBindingListView interfaces Write a custom collection from scratch, implementing IBindingListView and IBindingList. Obviously, the first option is my preferred choice. Thanking you.

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  • Turn off Mac , Finder App Problem !

    - by Taimur Hamza
    Hi everyone, Whenever i try to turn off my mac. This finder toolbar apears on top. And it doesnt remove even i try to Force Quit this application using Command+Options+Escape. Can anybody please suggest me wats wrong with it ? http://rapidshare.com/files/394092080/Picture_1.png Taimur

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  • Visual ASP.NET MVC Designer

    - by Nissan Fan
    Is there an add-in for the VSIDE that allows you to visually construct ASP.NET MVC solutions? Back in my struts days there were a number of options that made hooking together Views/Models/Controllers easy and interactive.

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  • #ifdef with gfortran 77

    - by ccook
    I am using gfortran to compile FORTRAN 77 and would like to have DEBUG build options by using the preprocessor directive #ifdef. However, when I use them I get compile time warnings "Illegal preprocessor directive". Is it possible to have this functionality without deviating from the standard toolchain?

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  • Web browser control: Detecting changes in form content

    - by Khou
    A form contains many elements, such as labels, Textbox, radio options box etc How do you detect the user has changed a textbox input value, or has choosen a radio option within the content of a web browser control? (not the winform itself). Do you handle a winform event for when the mouse clicked or keyboard keys pressed? or is there a better way to detect changes in the web browser content?

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  • Using GData and the Google Analytics on Android

    - by Luke Lowrey
    I am wondering what my options are for using GData and specifically the analytics api on android to build a small widget. After searching around for a while I couldnt come up with any libraries with decent examples. Are there any dedicated libraries with some decent examples / doco to do this sort of thing? I would like to target 1.6 but if the are 2.0 only I guess that is fine too.

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  • Content Negotiation on Tomcat

    - by stan
    I'm trying to get my Tomcat to use pretty URLs, similar to Apache's MultiViews option. I tried using AJP to proxy Tomcat to Apache, but the .htaccess file is still ignored. What are my options for Tomcat?

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