Search Results

Search found 6690 results on 268 pages for 'worst practices'.

Page 213/268 | < Previous Page | 209 210 211 212 213 214 215 216 217 218 219 220  | Next Page >

• What is the difference in WCF when using KnownType and ServiceKnownType?

  - by Paul Speranza

  I have a service that returns an array of animal but the list can contain cats, dogs, etc, which all extend animal. I know I need to use either the KnownType or ServiceKnownType attribute, and on the entity class or the service class, respectively. What is the difference between the 2 attributes? I prefer the ServiceKnownType because it is applied on the service, exactly where it is needed and called for, as opposed to KnownType which is applied on my entity. To me applying it on the entity class means knowing too far ahead how my entity class is being used. For now I have it on my entity and it works like a charm, but I am looking for guidance here as to best practices and usefullness. Thanks, Paul Speranza

  Read the article

• IM (Instant Messaging) increase or decrease developer's productivity?

  - by GRGodoi

  In my team I have some developers that always have two or three IM windows open. The majority of these windows are not related with the project where they are nor with asking or offering programming help. I also use IM and, off course, some of my "talks" are not related with the job. But I feel that when I am using IM my productivity drops. I mean, there is more "mental" work to change the scope between the task I am doing and the conversation every time a new message arrive. Do you face the same situation? Is there some good practices to avoid this (excluding, off course, stopping using IM)?

  Read the article

• What are the reasons to use dos batch programs in Windows?

  - by DVK

  Question What would be a good (ideally, technical) reason to ever program some non-trivial task in dos batch language on a modern Windows system as opposed to downloading either PowerShell, or ActiveState Perl? To be more specific, I make the following two assumptions for the duration of this question: anyone technical enough to be able to write a medium-complexity batch script is technical enough to install either of the scripting interpreters. Neither of those two present enough of a learning curve for basic batch replacement tasks that said curve would outweigh the pain of doing any remotely-non-trivial task in batch. Notes "You need a batch program for autoexec.bat" is not a valid reason. Your autoexec.bat may consist of simply calling non-batch script. If you disagree with either of my 2 assumptions above, that's fine, and I may be wrong. But my question is specifically "assuming those 2 assumptions are correct, what would be the reason to still stick with batch?" If it makes it easier to suspend disbelief (in case you disagree with me), add in a 3rd assumption that the question is limited to people who already posess at least some modicum of PowerShell or Perl experience. To re-iterate - this is not meant to be a subjective question about how easy it is to learn PSh or ASPerl compared to doing advanced batch coding. That is a separate question that is too subjective to be bothered with in this post. Background: I used to do some fairly complicated batch programming back in the elder days, and remember batch as one of the worst possble programming languages I had encountered. The idea for this question came after seeing a bunch of batch questions on SO, and trying to grok the answer of one of them out of sheer curiosity and giving up in pain after a minute, exclaiming mentally "why would anyone go through this pain instead of doing that in 1 line of Perl?" :) My own plausible answer I assume there may be an an likely DOS-compatible system, which has DOS interpreter but has no compatible PowerShell or Perl... I'm not aware of one but not completely impossible.

  Read the article

• IoC container configuration

  - by nivlam

  How should the configuration for an IoC container be organized? I know that registering by code should be placed at the highest level in an application, but what if an application had hundreds of dependencies that need to be registered? Same with XML configurations. I know that you can split up the XML configurations into multiple files, but that would seem like it would become a maintenance hassle if someone had to dig through multiple XML files. Are there any best practices for organizing the registration of dependencies? From all the videos and tutorials that I've seen, the code used in the demo were simple enough to place in a single location. I have yet to come across a sample application that utilizes a large number of dependencies.

  Read the article

• Memory leak in xbap application

  - by Arvind

  Hi, We are using many custom controls by inheriting form the WPFcontrols as the base and customizing it for our need. However, the memory used by these controls are not released, even after pages using the controls are closed, until the whole application is closed. As these application has to work for a whole day performance decreases as more and more memory gets held up. When we profiled our page we found that the controls where not getting collected as there where some binding reference or some borders or brushes etc not getting cleared from that control. We tried to use the Unload event of the controls to remove the events and some references from the control. This reduced the leak to some extent but this was slowing down closing of the page also the unload event was getting triggered when the control was even collapsed. Is there any other ways to overcome the leak? Are there any best practices to prevent memory leaks? Thanks Arvind

  Read the article

• JSLint reports "Unexpected dangling" character in an underscore prefixed variable name

  - by Zhami

  I know that some people consider the presence of a leading underscore to imply that a variable is "private," that such privacy is a fiction, and assume this is why JSLint reports such names with an error message. I use Google Analytics on a Web site I am building. I make reference to GA's variables, such as "_gaq." I am trying to get my JS code to be 100% JSLint clean (I'm not religious about my coding style, and so will go with Mr. Crockford's counsel). That said, I can't do anything about Google's variables names... so, I guess I can't get 100% "clean." I post here in case I've misunderstood the message, and can do something to comply with JSLint practices.

  Read the article

• Sparse parameter selection using Genetic Algorithm

  - by bgbg

  Hello, I'm facing a parameter selection problem, which I would like to solve using Genetic Algorithm (GA). I'm supposed to select not more than 4 parameters out of 3000 possible ones. Using the binary chromosome representation seems like a natural choice. The evaluation function punishes too many "selected" attributes and if the number of attributes is acceptable, it then evaluates the selection. The problem is that in these sparse conditions the GA can hardly improve the population. Neither the average fitness cost, nor the fitness of the "worst" individual improves over the generations. All I see is slight (even tiny) improvement in the score of the best individual, which, I suppose, is a result of random sampling. Encoding the problem using indices of the parameters doesn't work either. This is most probably, due to the fact that the chromosomes are directional, while the selection problem isn't (i.e. chromosomes [1, 2, 3, 4]; [4, 3, 2, 1]; [3, 2, 4, 1] etc. are identical) What problem representation would you suggest? P.S If this matters, I use PyEvolve.

  Read the article

• Multiple threads or process with threads

  - by sergiobuj

  Hi, this is for an assignment so I'm not looking for code. I have to simulate a game where each player has turns and needs to 'pay attention' to what's going on. So far, i know I'll need two threads for each player, one that will sleep until the player's turn and the other paying attention. My question is: Should I work each player as a 'fork' and the threads on the fork, or just create some threads for the player and associate them somehow? It's the first time I've worked with concurrency, semaphores and threads so I'm not sure about the good practices and programming style. Thanks!

  Read the article

• Spring Security: how to implement Brute Force Detection (BFD)?

  - by Kdeveloper

  My web applications security is handled by Spring Security 3.02 but I can't find any out of the box support for Brute Force Detection. I would like to implement some application level BFD protection. For example by storing failed login attempt per user in the database (JPA). The attacked user accounts could then get a lockout period or a forced account re-activation by e-mail. What's the best way to implement this with Spring Security? Does any body have example code or best practices on this?

  Read the article

• Distinguishing between .NET exception types

  - by Swingline Rage

  For the love of all things holy, how do you distinguish between different "exception flavors" within the predefined .NET exception classes? For example, a piece of code might throw an XmlException under the following conditions: The root element of the document is NULL Invalid chars are in the document The document is too long All of these are thrown as XmlException objects and all of the internal "tell me more about this exception" fields (such as Exception.HResult, Exception.Data, etc.) are usually empty or null. That leaves Exception.Message as the only thing that allows you to distinguish among these exception types, and you can't really depend on it because, you guessed it, the Exception.Message string is glocabilized, and can change when the culture changes. At least that's my read on the documentation. Exception.HResult and Exception.Data are widely ignored across the .NET libraries. They are the red-headed stepchildren of the world's .NET error-handling code. And even assuming they weren't, the HRESULT type is still the worst, downright nastiest error code in the history of error codes. Why we are still looking at HRESULTs in 2010 is beyond me. I mean if you're doing Interop or P/Invoke that's one thing but... HRESULTs have no place in System.Exception. HRESULTs are a wart on the proboscis of System.Exception. But seriously, it means I have to set up a lot of detailed specific error-handling code in order to figure out the same information that should have been passed as part of the exception data. Exceptions are useless if they force you to work like this. What am I doing wrong?

  Read the article

• Excluding a script from the general UrlRewrite rules

  - by Steven

  Hi, I have following rewrite rules for a website: RewriteEngine On # Stop reading config files RewriteCond %{REQUEST_FILENAME} .*/web.config$ [NC,OR] RewriteCond %{REQUEST_FILENAME} .*/\.htaccess$ [NC] RewriteRule ^(.+)$ - [F] # Rewrite to url RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_FILENAME} !^(/bilder_losning/|/bilder/|/gfx/|/js/|/css/|/doc/).* RewriteRule ^(.+)$ index.cfm?smartLinkKey=%{REQUEST_URI} [L] Now I have to exclude a script including its eventually querystrings from the above rules, so that I can access and execute it on the normal way, at the moment the whole url is being ignored and forwarded to the index page. I need to have access to the script shoplink.cfm in the root which takes variables tduid and url (shoplink.cfm?tduid=1&url=) I have tried to resolve it using this: # maybe?: RewriteRule !(^/shoplink.cfm [QSA] but to be honest, I have not much of a clue of urlrewriting and have no idea what I am supposed to write. I just know that above will generate a nice 500 error. I have been looking around a lot on stackoverflow and other websites on the same subject, but all I see is people trying to exclude directories, not files. In the worst case I could add the script to a seperate directory and exclude the directory from the rewriterules, but rather not since the script should really remain in the root. Just also tried: RewriteRule ^/shoplink.cfm$ $0 [L] but that didn't do anything either. Anyone who can help me out on this subject? Thanks in advance. Steven Esser ColdFusion programmer

  Read the article

• Select all links from a Html table using XPath (and HtmlAgilityPack)

  - by Adam Asham

  What I am trying to achieve is to extract all links with a href attribute that starts with http://, https:// or /. These links lie within a table (tbody tr td etc) with a certain class. I thought I could specify just the the a element without the whole path to it but it does not seem to work. I get a NullReferenceException at the line that selects the links: var table = doc.DocumentNode.SelectSingleNode("//table[@class='containerTable']"); if (table != null) { foreach (HtmlNode item in table.SelectNodes("a[starts-with(@href, 'https://')]")) { //not working I don't know about any recommendations or best practices when it comes to XPath. Do I create overhead when I query the document two times?

  Read the article

• ASP.NET MVC 2 validation using DTOs instead of domain entities

  - by Kevin Pang

  I'm struggling to mesh two best practices together: Using DataAnnotations + ModelBinding for validation in ASP.NET MVC 2 Using DTOs instead of domain entities when passing data via the ViewModel If I want to pass over DTOs instead of domain entities, then leveraging DataAnnotations + ModelBinding for validation would require me to specify validation attributes on my DTO classes. This results in a lot of duplicated work since multiple DTOs may hold overlapping fields with the same validation restrictions. This means that any time I change a validation rule in my domain, I have to go find all DTOs that correspond with that value and update their validation attributes.

  Read the article

• WCF Service Layer in n-layered application: performance considerations

  - by Marconline

  Hi all. When I went to University, teachers used to say that in good structured application you have presentation layer, business layer and data layer. This is what I heard for more than 5 years. When I started working I discovered that this is true but sometimes is better to have more than just three layers. Two or three days ago I discovered this article by John Papa that explain how to use Entity Framework in layered application. According to that article you should have: UI Layer and Presentation Layer (Model View Pattern) Service Layer (WCF) Business Layer Data Access Layer Service Layer is, to me, one of the best ideas I've ever heard since I work. Your UI is then completely "diconnected" from Business and Data Layer. Now when I went deeper by looking into provided source code, I began to have some questions. Can you help me in answering them? Question #0: is this a good enterpise application template in your opinion? Question #1: where should I host the service layer? Should it be a Windows Service or what else? Question #2: in the source code provided the service layer expose just an endpoint with WSHttpBinding. This is the most interoperable binding but (I think) the worst in terms of performances (due to serialization and deserializations of objects). Do you agree? Question #3: if you agree with me at Question 2, which kind of binding would you use? Looking forward to hear from you. Have a nice weekend! Marco

  Read the article

• Server Security

  - by mahatmanich

  I want to run my own root server (directly accessible from the web without a hardware firewall) with debian lenny, apache2, php5, mysql, postfix MTA, sftp (based on ssh) and maybe dns server. What measures/software would you recomend, and why, to secure this server down and minimalize the attack vector? Webapplications aside ... This is what I have so far: iptables (for gen. packet filtering) fail2ban (brute force attack defense) ssh (chang default, port disable root access) modsecurity - is really clumsy and a pain (any alternative here?) ?Sudo why should I use it? what is the advantage to normal user handling thinking about greensql for mysql www.greensql.net is tripwire worth looking at? snort? What am I missing? What is hot and what is not? Best practices? I like "KISS" - Keep it simple secure, I know it would be nice! Thanks in advance ...

  Read the article

• Perl for a Python programmer

  - by fortran

  I know Python (and a bunch of other languages) and I think it might be nice to learn Perl, even if it seems that most of the people is doing it the other way around... My main concern is not about the language itself (I think that part is always easy), but about learning the Perlish (as contrasted with Pythonic) way of doing things; because I don't think it'll be worth the effort if I end up programming Python in Perl. So my questions are basically two: Are there many problems/application areas where it's actually more convenient to solve them in Perl rather than in Python? If the first question is positive, where can I found a good place to get started and learn best practices that is not oriented to beginners?

  Read the article

• django-rest-framework: api versioning

  - by w--

  so googling around it appears that the general consensus is that embedding version numbers in REST URIs is a bad practice and a bad idea. even on SO there are strong proponents supporting this. e.g. Best practices for API versioning? My question is about how to accomplish the proposed solution of using the accept header / content negotiation in the django-rest-framework to accomplish this. It looks like content negotiation in the framework, http://django-rest-framework.org/api-guide/content-negotiation.html is already configured to automatically return intended values based on accepted MIME types. If I start using the Accept header for custom types, I'll lose this benefit of the framework. Is there a better way to accomplish this in the framework?

  Read the article

• Optimizing performance of large ASP.NET applications

  - by NLV

  Hello, I'm building a asp.net web application with lots and lots of controls and huge volumes of data. My application is very slow and it is taking a large amount of time to load the data into the .net controls like grid, tree view etc. I also have some ajaxified pages and controls in my application. I want to reduce the page load time in each postbacks. What are the standards/best practices to be followed while developing large asp.net applications? Thank you. NLV

  Read the article

• Pseudorandom crashes in Flash Debugger - My bad, or Abode's?

  - by rinogo

  I'm working on a large-size dual AS3/Flex project (some parts are pure AS3, other parts are Flex), and I'm experiencing a lot of Flash Debugger crashes. These crashes aren't completely random - it seems like I can get them to occur with greater consistency when I perform certain actions in my app. However, at the same time, they aren't consistently repeatable - sometimes a set of actions causes my app to crash, and other times, the same steps execute fine without a crash. I have two questions (carefully worded to remove my personal bias :) ) Are these crashes due to my coding practices, or Adobe's Flash Debugger? When I deploy my app on a web site and access it via Flash Player, should I expect the same crashes to occur, or is Flash Player considerably more resilient than Flash Debugger? Thanks so much, all! :) -Rich

  Read the article

• Java+DOM: How do I convert a DOM tree without namespaces to a namespace-aware DOM tree?

  - by java.is.for.desktop

  Hello, everyone! I receive a Document (DOM tree) from a certain API (not in JDK). Sadly, this Document is not namespace-aware. As far as I know DOM, once generated, namespace-awareness can't be "added" afterwards. When converting this Document using a Transformer to a string, the XML is correct. Elements have xmlns:... attributes and name prefixes. But from the DOM point of view, there are no namespaces and no prefixes. I need to be able to convert this Document into a new Document which is namespace-aware. Yes, I could do this by just converting it to a string and back to DOM with namespaces enabled. But: nodes of the original tree have user-objects set. Converting to string and back would make a mapping of these user-objects to the new Document very complicated, if not impossible. So I really need a way to convert non-namespace DOM to namespace DOM. Are there any more-or-less straightforward solutions for this? Worst case (what I'm hoping to avoid) would be to manually iterate through old Document tree and create new namespace-aware Node for each old Node. Doing so, one had to manually "parse" namespace prefixes, watch out for xmlns-attributes, and maintain a mapping between prefixes and namespace-URIs. Lots of things to go wrong.

  Read the article

• Supporting multiple screen sizes with Android using ImageButtons

  - by droidy

  I've read the Android documentation: http://developer.android.com/guide/practices/screens_support.html but still have some questions. I'm trying to design a music application which basically has images of the instrument (ImageButton) that play a sound when clicked. However, I'm confused about how to have the ImageButtons scale to fit all the different screen sizes and how to position them. Which layout is best used for needing to position ImageButtons in specific locations on the screen? (i.e. cymbals on a drum set) FrameLayout, RelativeLayout? If I only really care about medium and large screens, do I need to create different resources (images) for both as well as a different XML layout to position them? I'm trying to find the simplest way to do this without having to create a separate layout XML file for positioning/size and separate image resources for each screen. Any guidance is greatly appreciated. Thanks!

  Read the article

• Is there any better IDOMImplementation other than MSXML?

  - by Chau Chee Yang

  There are 3 IDOMImplementation available in Delphi: MSXML Xerces XML ADOM XML v4 MSXML is the default IDOMImplementation. My test is count the time need to load a 10MB xml file. I use a Delphi unit generated from a XSD using XML data binding to load the xml file. This unit has 3 common function: function Getmenubar(Doc: IXMLDocument): IXMLMenubarType; function Loadmenubar(const FileName: WideString): IXMLMenubarType; function Newmenubar: IXMLMenubarType; I learn from the web that some comment that MSXML's overhead is high that it doesn't perform if compare to other XML parser. However, my study shows that MSXML is the best among others. Xerces XML 2nd and ADOM XML v4 the worst: MSXML - 0.6410 seconds Xerces XML - 2.4220 seconds ADOM XML v4 - 67.50 seconds I also come across with OmniXML that claim to have much better performance compare to MSXML but I never success using it with the unit generated by XML data binding. Is there any other vendor that implement IDOMImplementation of Delphi that work much better than MSXML? I am using Delphi 2010 and Windows 7.

  Read the article

• Service broker with SqlNotificationRequest

  - by user171523

  I am in the process of evaluating a Service Broker with SQL noticiation for my project. My requirements is User places a order from System A and it will update Order Table. As soon as order is place i need to notify the System B. I have done a quick POC with Trigger , Service Broker and SQLNotificaiton ADO.NET. It is working as i expected. What i would like to know the group A) What are the best practices i need to follow for this? B) What are disadvantages with the above approach if any? C) Are there any disadvantes of using the Triggers? If so what are those for above approach? The order table will get order from System A like 1000 to 1500 every day. I also would like to know the performance of above approach.

  Read the article

• How to implement a Digg-like algorithm?

  - by Niklas

  Hi, How to implement a website with a recommendation system similar to stackoverflow/digg/reddit? I.e., users submit content and the website needs to calculate some sort of "hotness" according to how popular the item is. The flow is as follows: Users submit content Other users view and vote on the content (assume 90% of the users only views content and 10% actively votes up or down on content) New content is continuously submitted How do I implement an algorithm that calculates the "hotness" of a submitted item, preferably in real-time? Are there any best-practices or design patterns? I would assume that the algorithm takes the following into consideration: When an item was submitted When each vote was cast When the item was viewed E.g. an item that gets a constant trickle of votes would stay somewhat "hot" constantly while an item that receives a burst of votes when it is first submitted will jump to the top of the "hotness"-list but then fall down as the votes stop coming in. (I am using a MySQL+PHP but I am interested in general design patterns).

  Read the article

• Winforms - a strange problem a with simple binding

  - by Adi Barda

  Hi Guys, It's hard for me to clearly describe my problem but I'll try. I have a UserControl1 which contains UserControl2 which contains several WinForms controls (most of them DevExpress). I do simple binding to these controls to my datatable fields. So far everything works fine. When I move the focus to a record in the table (by navigating in a grid rows for example) the binding works great, the concurrenmcy manager moves the cursor and everything reflects right in the bounded controls. The problem starts when I add new user UserControl3 above UserControl2 and make UserControl2.Visible = false. Now UserControl3 is shown and UserControl2 exists but not shown. Now when I set UserControl2.Visible = true to show it again the simple binding stops working! I navigate in the grid but either the ConcurrencyManager stops working or the simple binding becomes disconnected. My question: Are there any known issues/ best practices with the binding & concurrency manager? Thanks a lot, Adi Barda

  Read the article

< Previous Page | 209 210 211 212 213 214 215 216 217 218 219 220  | Next Page >