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  • Best way to reverse a string in C# 2.0

    - by Guy
    I've just had to write a string reverse function in C# 2.0 (i.e. LINQ not available) and came up with this: public string Reverse(string text) { char[] cArray = text.ToCharArray(); string reverse = String.Empty; for (int i = cArray.Length - 1; i > -1; i--) { reverse += cArray[i]; } return reverse; } Personally I'm not crazy about the function and am convinced that there's a better way to do it. Is there?

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  • Where should I set the DataContext - code behind or xaml?

    - by dovholuk
    (honestly I searched and read all the 'related questions' that seemed relevant - i do hope i didn't "miss" this question from elsewhere but here goes...) There are two different ways (at least) to set the DataContext. One can use XAML or one can use the code behind. What is the 'best practice' and why? I tend to favor setting it in XAML because it allows a designer to define collections on their own but I need 'ammunition' on why it's a best practice or why I'm crazy and the code behind is the bomb...

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  • How do include paths work in Visual Studio?

    - by Paperflyer
    Visual Studio drives me crazy and I am suspecting I am doing something wrong. This is what I do: I installed Visual Studio (Pro '08) a long time ago, I installed the Windows SDK (Win 7 x64), someone emails me a project, it fails to build. Invariably, it can not find windows.h. While it is easy enough to include C:\Program Files\Microsoft SDKs\Windows\v7.0\Include in the project settings of every single project, I feel that this may not be the proper way to do it. Is there a way to somehow make Visual Studio globally aware of these files? I also tried to include the above directory in the path variable but that didn't change anything. Also, it will randomly find windows.h but not winresrc.h in the same directory.

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  • Is it possible to do an Ajax request for an ICS file?

    - by Kyle
    I am trying to do an Ajax request for an ICS file. Yeah, I know it sounds crazy, but I found the perfect library to parse the iCal data. Any ideas why the data comes up blank when I do this? $.ajax({ success:function(data){ alert(data); }, url:"http://wsidecar.apple.com/cgi-bin/nph-reg3rdpty2.pl/product=15714&cat=98&platform=osx&method=sa/Swiss32Holidays.ics" }); It makes the request fine, but the data still comes up blank.

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  • Django: Inject errors into already validated form?

    - by Parand
    After my form.Form validates the user input values I pass them to a separate (external) process for further processing. This external process can potentially find further errors in the values. Is there a way to inject these errors into the already validated form so they can be displayed via the usual form error display methods? Or, are there better alternative approaches? One suggestions was to include the external processing in the form validation. I'm not crazy about this since the external process does a lot more than just validate.

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  • FireFox Toolbar Open Window in new Tab

    - by Mark
    Hi all, I have a Toolbarbutton <toolbarbutton context="TabMenue" id="esbTb_rss_reader" label="News" type="menu"> with a Context menue which comes up when the button is right clickt <menupopup id="TabMenue" > <menuitem label="New Tab" oncommand="esbTb_loadURLNewTab()"/> </menupopup> so this function should open the new window in a new tab function esbTb_loadURLNewTab() { window.open(ClickUrl,'name'); } I don't get it working that the new Window is showing up in a new tab it always opens a new firefox window. I tried also like described in this article to set the browser.link.open_newwindow and browser.link.open_newwindow.restriction preferences but that doesn't bringt anything. And I tried it with all Target attributes which came in my mind. So I'm grateful for any hints, tips what ever this is driving me crazy...

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  • How to access the service instance from host object in WCF?

    - by user1048677
    I am trying to incarnate some sort of ad hoc WCF service. I already managed to launch it and make it call its own web methods as some other guy's methods. The issue that I am facing is instance management. I have set [ServiceBehavior(InstanceContextMode = InstanceContextMode.Single)] so it now has a global instance with the same properties for all clients. But besides that I need it to call other services of its kind while listening to incoming requests from clients (similar crazy services). While debugging I noticed that the ServiceHost's constructor calls the constructor of the service class. So, I assumed it has access to the global instance of this class and I need to find a way to call methods of this instance. Please don't ask what I have been smoking, I just have to make it ad hoc.

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  • Getting number of days between [NSDate date] and string @"2010-11-12"

    - by grobald
    Hello i have a question. in short: i need a function which receives [NSDate date] and string @"2010-11-12" and returns the amount of days between those two dates. more explanation: I need to store a date from a server in the format @"2010-11-12" in my NSUserdefaults. The meaning of this date is the expireDate of a feature in an iPhone App. Everytime i press on a button for this feature i need to check if the difference in days between the current time-[NSDate date] and @"2010-11-12" is greater than 0. That means tahat the feature is disabled. its making me crazy mabey its to dead simple.

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  • 2 table SQL Query weird results

    - by javArc
    Ok this is driving me nuts, I need to write an SQL query that will grab product information from 2 tables. The first table 'products' contains the productId, productname, quantityperunit and unitprice. Now I can search by productname and categoryname individually, but when I try to combine the 2 I get crazy results, Here's the query: "SELECT DISTINCT productId, productname, quantityperunit, unitprice FROM products pr, categories ca WHERE pr.categoryID = ca.categoryID AND ProductName LIKE '%" + searchTerm + "%' OR CategoryName LIKE '%" + searchTerm + "%' excuse the java style in there, here it is formatted better: SELECT DISTINCT productId, productname, quantityperunit, unitprice FROM products pr, categories ca WHERE pr.categoryID = ca.categoryID AND ProductName LIKE 'Tofu' OR CategoryName LIKE 'Tofu' any help would be appreciated.

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  • Software buttons in the android 4.2 emulator not showing up (tablet)

    - by The_Unknown
    I'm getting crazy right now. I just installed the latest android adt bundle from http://developer.android.com/sdk/index.html. It's version v21.0.0. Now I wanted to test my tablet app (designed for 10.1" xlarge mdpi) in the emulator, but I cannot get any software buttons for home/back/... Here's my device configuration. This config is afterwards assigned to the avd. http://i.stack.imgur.com/Q7xvP.png Hardware-buttons don't work as well (you cannot set hardware buttons in a tablet-like emulator). The target api is level 15 (android 4.0.3). I searched stackoverflow, but didn't find any help concerning the latest version of android. Since time's running away a little, any quick help would be great! Thanks in advance. Bye The_Unknown

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  • What Is Causing The Humming Sound On My Website?

    - by Draven Vestatt
    I've noticed this on a handful of websites on the web. Sometimes there will be a low humming sound, that doesn't increase or decrease with volume. I've searched the web, and I can't find anything addressing it. My website that I've working on(still under construction): http://nottheactualaddress.com Do you hear a low humming sound? The audio is low even if you turn up your volume. If so, what do you think is causing it? It's driving me crazy...

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  • How do I setup Eclipse to stop on the line an exception occured?

    - by Chris Persichetti
    Hi, How can I setup Eclipse to stop at the point an exception occurred. I have an Eclipse breakpoint setup to break on an exception. In the code example below, the problem I'm having is Eclipse tries to open the Integer source code. Is there any way to just have debugger break at the point shown in my code example? If I move down the stack trace, I will get to this line, it'd be nice if there's a way to do this without the "Source not found" window coming up. This can be done in Visual Studio, so it's driving me crazy not being able to find a way to do this in Eclipse. package com.test; public class QuickTest { public static void main(String[] args) { try { test(); } catch(NumberFormatException e) { System.out.println(e.getMessage()); } } private static void test() { String str = "notAnumber"; Integer.parseInt(str);//<----I want debugger to stop here } }

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  • ActiveRecord validates... custom field name.

    - by Dmitriy Likhten
    I would like to fix up some error messages my site generates. Here is the problem: class Brand < ActiveRecord::Base validates_presence_of :foo ... end My goal is to make a message "Ticket description is required" instead of "Foo is required" or may not be blank, or whatever. The reason this is so important is because lets say previously the field was ticket_summary. That was great and the server was coded to use that, but now due to crazy-insane business analysts it has been determined that ticket_summary is a poor name, and should be ticket_description. Now I don't necessarily want to have my db be driven by the user requirements for field names, especially since they can change frequently without functionality changes. Is there a mechanism for providing this already?

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  • How can I represent URL (possibly including query string) as a filename in Java without obscuring the original URL?

    - by jerluc
    Is there any real way to represent a URL (which more than likely will also have a query string) as a filename in Java without obscuring the original URL completely? My first approach was to simply escape invalid characters with arbitrary replacements (for example, replacing "/" with "_", etc). The problem is, as in the example of replacing with underscores is that a URL such as "app/my_app" would become "app_my_app" thus obscuring the original URL completely. I have also attempted to encode all the special characters, however again, seeing crazy %3e %20 etc is really not clear. Thank you for any suggestions.

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  • Zend_Form setMultiFile()

    - by Cristian
    Hello everyone, i got a question related to the setMultiFile method of zend_form. I already got a form like this: $foto->setLabel('Foto:'); $foto->addValidator('IsImage', true); $foto->addValidator('Count', true, 12); $foto->addValidator('Extension', true, 'gif,png,jpg'); $foto->setDestination(PUBLIC_PATH.'/upload/img/'); $foto->addFilter('Rename', array( 'target' => PUBLIC_PATH.'/upload/img/', 'overwrite' => true )); $foto->addDecorators(array( array('Description',array('tag'=>'','escape'=>false)) )); And it's everything working...but now i need to iterate each element to set a description and decorators...any suggestions ? Thanks to everyone that will reply to this, i'm drivin crazy with that..

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  • Django development server serving css but not js

    - by Wisco crew
    I am developing a django (1.4) app on my local machine. I am running the built-in development server with python manage.py runserver. In base.html I have: <link href="{{ STATIC_URL }}bootstrap.css" rel="stylesheet" type="text/css" /> <script src="{{ STATIC_URL }}boostrap-dropdown.js" type="text/javascript"></script> boostrap.css loads just fine when I load a page, but bootstrap-dropdown.js is 404'd. They are sitting right next to each other in my static directory. Relevant parts of settings.py: STATIC_URL = '/static/' STATICFILES_DIRS = ( '/home/username/projects/projectname/static',) Debug is set to True. I have tried it both with and without the staticfiles_urlpatterns trick. Django can find one file in the directory but not the other? I think I'm going crazy.

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  • Call java program on server through web request

    - by Rossella
    I need to develop an application where a Java client calls a Java application located on the server with certain parameters, the Java application on the server computes data and sends the data back to the client. Everything needs to go through port 80 on which I have a IIS webserver listening. I cannot open any other port on the server. Is there any way I can do this? The server can write files in a directory that the client can read but I am not sure how to handle the synchronization and I don't know how to call a script on the server from the client through port 80. Every suggestion would be highly appreciated Thanks a lot in advance, this problem is making me crazy

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  • What's the safest way to remove data from mysql? (PHP/Mysql)

    - by ggfan
    I want to allow users as well as me(the admin) to delete data in mysql. I used to have remove.php that would get $_GETs from whatever that needed to be deleted such as... remove.php?action=post&posting_id=2. But I learned that anyone can simply abuse it and delete all my data. So what's the safest way for users and me to delete information without getting all crazy and hard? I am only a beginner :) I'm not sure if I can use POSTs because there is no forms and the data isn't changing. Is sessions good? Or would there be too many with postings, user information, comments, etc. Ex: James wants to delete one of his postings(it is posting_id=5). So he clicks the remove link and that takes him to remove.php?action=post&posting_id=5.

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  • Best Practice for loading non-existent data

    - by Aizotu
    I'm trying to build a table in MS SQL 2008, loaded with roughly 50,000 rows of data. Right now I'm doing something like: Create Table MyCustomData ( ColumnKey Int Null, Column1 NVarChar(100) Null, Column2 NVarChar(100) Null Primary Key Clustered ( ColumnKey ASC ) WITH ( PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON ) ) CREATE INDEX IDX_COLUMN1 ON MyCustomData([COLUMN1]) CREATE INDEX IDX_COLUMN2 ON MyCustomData([COLUMN2]) DECLARE @MyCount Int SET @MyCount = 0 WHILE @MyCount < 50000 BEGIN INSERT INTO MyCustomData (ColumnKey, Column1, Column2) Select @MyCount + 1, 'Custom Data 1', 'Custom Data 2' Set @MyCount = @MyCount + 1 END My problem is that this is crazy slow. I thought at one point I could create a Select Statement to build my custom data and use that as the datasource for my Insert Into statement. i.e. something like INSERT INTO MyCustomData (ColumnKey, Column1, Column2) From (Select Top 50000 Row_Count(), 'Custom Data 1', 'Custom Data 2') I know this doesn't work, but its the only thing I can show that seems to provide an example of what I'm after. Any suggestions would be greatly appriciated.

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  • ActionScript - One Button Limit (Exclusive Touch) For Mobile Devices?

    - by TheDarkIn1978
    two years ago, when i was developing an application for the iPhone, i used the following built-in system method on all of my buttons: [button setExclusiveTouch:YES]; essentially, if you had many buttons on screen, this method insured that the application wouldn't be permitted do crazy things when several button events firing at the same time. problematic: ButtonA and ButtonB are available. each button has a mouse up event which fire a specific reorganization/layout of the UI. if both button's events are fired at the same time, their events will likely conflict, causing a strange new layout, perhaps a runtime error. solution: application buttons cancel any current pending mouse up events when said button enters mouse down. private function mouseDownEventHandler(evt:MouseEvent):void { //if other buttons are currently in a mouse down state ready to fire //a mouse up event, cancel them all here. } of course it's simple to manually handle this if there are only a few buttons on stage, but managing buttons becomes more and more complicated / bug-prone if there are several / many buttons available. is there a convenience method available in AIR specifically for this functionality?

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  • XNA Notes 006

    - by George Clingerman
    If you used to think the XNA community was small and inactive, hopefully these XNA Notes are opening your eyes. And I honestly feel like I’m still only catching the tail end of everything that’s going on. It’s a large and active community and you can be so mired down in one part of it you miss all sorts of cool stuff another part is doing. XNA is many things to a lot of people and that makes for a lot of really awesome things going on. So here’s what I saw going on this last week! Time Critical XNA New: XNA Team - Peer Review now closes for XNA 3.1 games http://blogs.msdn.com/b/xna/archive/2011/02/08/peer-review-pipeline-closed-for-new-xna-gs-3-1-games-or-updates-on-app-hub.aspx http://twitter.com/XNACommunity/statuses/34649816529256448 The XNA Team posts about a meet up with Microsoft for Creator’s going to be at GDC, March 3rd at the Lobby Bar http://on.fb.me/fZungJ XNA Team: @mklucher is busying playing the the bubblegum on WP7 made by a member of the XNA team (although reportedly made in Silverlight? Crazy! ;) ) http://twitter.com/mklucher/statuses/34645662737895426 http://bubblegum.me Shawn Hargreaves posts multiple posts (is this a sign that something new is coming from the XNA team? Usually when Shawn has time to post, something has just wrapped up…) Random Shuffle http://blogs.msdn.com/b/shawnhar/archive/2011/02/09/random-shuffle.aspx Doing the right thing: resume, rewind or skip ahead http://blogs.msdn.com/b/shawnhar/archive/2011/02/10/doing-the-right-thing-resume-rewind-or-skip-ahead.aspx XNA Developers: Andrew Russel was on .NET Rocks recently talking with Carl and Richard about developing games for Xbox, iPhone and Android http://www.dotnetrocks.com/default.aspx?ShowNum=635 Eric W. releases the Fishing Girl source code into the wild http://ericw.ca/blog/posts/fishing-girl-now-open-source/ http://forums.create.msdn.com/forums/p/74642/454512.aspx#454512 BinaryTweedDeej reminds that XNA community that Indie City wants you involved http://twitter.com/BinaryTweedDeej/statuses/34596114028044288 http://www.indiecity.com Mike McLaughlin (@mikebmcl) releases his first two XNA articles on the TechNet wiki http://social.technet.microsoft.com/wiki/contents/articles/xna-framework-overview.aspx http://social.technet.microsoft.com/wiki/contents/articles/content-pipeline-overview.aspx John Watte plays around with the Content Pipeline and Music Visualization exploring just what can be done. http://www.enchantedage.com/xna-content-pipeline-fft-song-analysis http://www.enchantedage.com/fft-in-xna-content-pipeline-for-beat-detection-for-the-win Simon Stevens writes up his talk on Vector Collision Physics http://www.simonpstevens.com/News/VectorCollisionPhysics @domipheus puts together an XNA Task Manager http://www.flickr.com/photos/domipheus/5405603197/ MadNinjaSkillz releases his fork of Nick's Easy Storage component on CodePlex http://twitter.com/MadNinjaSkillz/statuses/34739039068229634 http://ezstorage.codeplex.com @ActiveNick was interviewed by Rob Cameron and discusses Windows Phone 7, Bing Maps and XNA http://twitter.com/ActiveNick/statuses/35348548526546944 http://msdn.microsoft.com/en-us/cc537546 Radiangames (Luke Schneider) posts about converting his games from XNA to Unity http://radiangames.com/?p=592 UberMonkey (@ElementCy) posts about a new project in the works, CubeTest a Minecraft style terrain http://www.ubergamermonkey.com/personal-projects/new-project-in-the-works/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+Ubergamermonkey+%28UberGamerMonkey%29 Xbox LIVE Indie Games (XBLIG): VideoGamer Rob review Bonded Realities http://videogamerrob.wordpress.com/2011/02/05/xblig-review-bonded-realities/ XBLIG Round Up on Gamergeddon http://www.gamergeddon.com/2011/02/06/xbox-indie-game-round-up-february-6th/ Are gamers still rating Indie Games after the Xbox Dashboard update? http://www.gamemarx.com/news/2011/02/06/are-gamers-still-rating-indie-games-after-the-xbox-dashboard-update.aspx Joystiq - Xbox Live Indie Gems: Corrupted http://www.joystiq.com/2011/02/04/xbox-live-indie-gems-corrupted/ Raymond Matthews of DarkStarMatryx reviews (Almost) Total Mayhem and Aban Hawkins & the 1000 Spikes http://www.darkstarmatryx.com/?p=225 http://www.darkstarmatryx.com/?p=229 8 Bit Horse reviews Aban Hawkins & the 1000 spikes http://8bithorse.blogspot.com/2011/01/aban-hawkins-1000-spikes-xbl-indie.html 2010 wrap-up for FunInfused Games http://www.krissteele.net/blogdetails.aspx?id=245 NeoGaf roundup of January's XBLIGs http://www.neogaf.com/forum/showthread.php?t=420528 Armless Ocotopus interviews Michael Ventnor creator of Bonded Realities http://www.armlessoctopus.com/2011/02/07/interview-michael-ventnor-of-red-crest-studios/ @recharge_media posts about the new city music for Woodvale in Sin Rising http://rechargemedia.com/2011/02/08/new-city-theme-woodvale/ @DrMisty posts some footage of YoYoYo in action http://www.mstargames.co.uk/mistryblogmain/54-yoyoyoblogs/184-video-update.html Xona Games - Decimation X3 on Reviews on the Run http://video.citytv.com/video/detail/782443063001.000000/reviews-on-the-run--february-8-2011/g4/ @benkane gives an early peek at his action RPG coming to XBLIG http://www.youtube.com/watch?v=bDF_PrvtwU8 Rock, Paper Shotgun talks to Zeboyd games about bringing Cthulhu Saves the World to PC http://www.rockpapershotgun.com/2011/02/11/summoning-cthulhu-natter-with-zeboyd/ Xbox LIVE Indieverse interviews the creator of Bonded Realities http://xbl-indieverse.blogspot.com/2011/02/xbl-indieverse-interview-red-crest.html XNA Game Development: Dream-In-Code posts about an upcoming XNA Challenge/Coding contest http://www.dreamincode.net/forums/blog/1385/entry-3192-xna-challengecontest/ Sgt.Conker covers Fishing Girl and IndieFreaks Game Framework release http://www.sgtconker.com/2011/02/fishing-girl-did-not-sell-a-single-copy/ http://www.sgtconker.com/2011/02/indiefreaks-game-framework-v0-2-0-0/ @slyprid releases Transmute v0.40a with lots of new features and fixes http://twitter.com/slyprid/statuses/34125423067533312 http://twitter.com/slyprid/statuses/35326876243337216 http://forgottenstarstudios.com/ Jeff Brown writes an XNA 4.0 tutorial on Saving/Loading on the Xbox 360 http://www.robotfootgames.com/xna-tutorials/92-xna-tutorial-savingloading-on-xbox-360-40 XNA for Silverlight Developers: Part 3- Animation http://www.silverlightshow.net/items/XNA-for-Silverlight-developers-Part-3-Animation-transforms.aspx?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+xna-connection-twitter-specific-stream+%28XNA+Connection%27s+Twitter+specific+stream%29 The news from Nokia is definitely something XNA developers will want to keep their eye on http://blogs.forum.nokia.com/blog/nokia-developer-news/2011/02/11/letter-to-developers?sf1066337=1

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  • It’s nice to be important, but it’s more important to be nice

    - by BuckWoody
    I’ve been a little “preachy” lately, telling you that you should let people finish their sentences, and always check a problem out before you tell a user that their issue is “impossible”. Well, I’ll round that out with one more tip today. Keep in mind that all of these things are actions I’ve been guilty of, hopefully in the past. I’m kind of a “work in progress”. And yes, I know these tips are coming from someone who picks on people in presentations, but that is of course done in fun, and (hopefully) with the audience’s knowledge.   (No, this isn’t aimed at any one person or event in particular – I just see it happen a lot)   I’ve seen, unfortunately over and over, someone in authority react badly to someone who is incorrect, or at least perceived to be incorrect. This might manifest itself in a comment, post, question or whatever, but the point is that I’ve seen really intelligent people literally attack someone they view as getting something wrong. Don’t misunderstand me; if someone posts that you should always drop a production database in the middle of the day I think you should certainly speak up and mention that this might be a bad idea!  No, I’m talking about generalizations or even incorrect statements done in good faith. Let me explain with an example.   Suppose someone makes the statement: “If you don’t have enough space on your system, you can just use a DBCC command to shrink the database”. Let’s take two responses to this statement.   Response One: “That’s insane. Everyone knows that shrinking a database is a stupid idea, you’re just going to fragment your indexes all over the place.” Response Two: “That’s an interesting take – in my experience and from what I’ve read here (someurl.com) I think this might not be a universal best practice.”   Of course, both responses let the person making the statement and those reading it know that you don’t agree, and that it’s probably wrong. But the person you responded to and the general audience hearing you (or reading your response) might form two different opinions of you.   The first response says to me “this person really needs to be right, and takes arguments personally. They aren’t thinking of the other person at all, or the folks reading or hearing the exchange. They turned an incorrect technical statement into a personal attack. They haven’t left the other party any room to ‘save face’, and they have potentially turned what could be a positive learning experience for everyone into a negative. Also, they sound more than just a little arrogant.”   The second response says to me “this person has left room for everyone to save face, has presented evidence to the contrary and is thinking about moving the ball forward and getting it right rather than attacking someone for getting it wrong.” It’s the idea of questioning a statement rather than attacking a person.   Perhaps you have a different take. Maybe you think the “direct” approach is best – and maybe that’s worked for you. Something to consider is what you’ve really accomplished while using that first method. Sure, the info you provide is correct, and perhaps someone out there won’t shrink a database because of your response – but perhaps you’ve turned a lot more people off, and now they won’t listen to your other valuable information. You’ll be an expert, but another one of the nameless, arrogant jerks in technology. And I don’t think anyone likes to be thought of that way.   OK, I’ll get down off of the high-horse now. And I’ll keep the title of this entry (said to me by my grandmother when I was a little kid) in mind when I dismount. Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!

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  • Replacing “if”s with your own number system

    - by Michael Williamson
    During our second code retreat at Red Gate, the restriction for one of the sessions was disallowing the use of if statements. That includes other constructs that have the same effect, such as switch statements or loops that will only be executed zero or one times. The idea is to encourage use of polymorphism instead, and see just how far it can be used to get rid of “if”s. The main place where people struggled to get rid of numbers from their implementation of Conway’s Game of Life was the piece of code that decides whether a cell is live or dead in the next generation. For instance, for a cell that’s currently live, the code might look something like this: if (numberOfNeighbours == 2 || numberOfNeighbours == 3) { return CellState.LIVE; } else { return CellState.DEAD; } The problem is that we need to change behaviour depending on the number of neighbours each cell has, but polymorphism only allows us to switch behaviour based on the type of a value. It follows that the solution is to make different numbers have different types: public interface IConwayNumber { IConwayNumber Increment(); CellState LiveCellNextGeneration(); } public class Zero : IConwayNumber { public IConwayNumber Increment() { return new One(); } public CellState LiveCellNextGeneration() { return CellState.DEAD; } } public class One : IConwayNumber { public IConwayNumber Increment() { return new Two(); } public CellState LiveCellNextGeneration() { return CellState.LIVE; } } public class Two : IConwayNumber { public IConwayNumber Increment() { return new ThreeOrMore(); } public CellState LiveCellNextGeneration() { return CellState.LIVE; } } public class ThreeOrMore : IConwayNumber { public IConwayNumber Increment() { return this; } public CellState LiveCellNextGeneration() { return CellState.DEAD; } } In the code that counts the number of neighbours, we use our new number system by starting with Zero and incrementing when we find a neighbour. To choose the next state of the cell, rather than inspecting the number of neighbours, we ask the number of neighbours for the next state directly: return numberOfNeighbours.LiveCellNextGeneration(); And now we have no “if”s! If C# had double-dispatch, or if we used the visitor pattern, we could move the logic for choosing the next cell out of the number classes, which might feel a bit more natural. I suspect that reimplementing the natural numbers is still going to feel about the same amount of crazy though.

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  • It’s nice to be important, but it’s more important to be nice

    - by BuckWoody
    I’ve been a little “preachy” lately, telling you that you should let people finish their sentences, and always check a problem out before you tell a user that their issue is “impossible”. Well, I’ll round that out with one more tip today. Keep in mind that all of these things are actions I’ve been guilty of, hopefully in the past. I’m kind of a “work in progress”. And yes, I know these tips are coming from someone who picks on people in presentations, but that is of course done in fun, and (hopefully) with the audience’s knowledge.   (No, this isn’t aimed at any one person or event in particular – I just see it happen a lot)   I’ve seen, unfortunately over and over, someone in authority react badly to someone who is incorrect, or at least perceived to be incorrect. This might manifest itself in a comment, post, question or whatever, but the point is that I’ve seen really intelligent people literally attack someone they view as getting something wrong. Don’t misunderstand me; if someone posts that you should always drop a production database in the middle of the day I think you should certainly speak up and mention that this might be a bad idea!  No, I’m talking about generalizations or even incorrect statements done in good faith. Let me explain with an example.   Suppose someone makes the statement: “If you don’t have enough space on your system, you can just use a DBCC command to shrink the database”. Let’s take two responses to this statement.   Response One: “That’s insane. Everyone knows that shrinking a database is a stupid idea, you’re just going to fragment your indexes all over the place.” Response Two: “That’s an interesting take – in my experience and from what I’ve read here (someurl.com) I think this might not be a universal best practice.”   Of course, both responses let the person making the statement and those reading it know that you don’t agree, and that it’s probably wrong. But the person you responded to and the general audience hearing you (or reading your response) might form two different opinions of you.   The first response says to me “this person really needs to be right, and takes arguments personally. They aren’t thinking of the other person at all, or the folks reading or hearing the exchange. They turned an incorrect technical statement into a personal attack. They haven’t left the other party any room to ‘save face’, and they have potentially turned what could be a positive learning experience for everyone into a negative. Also, they sound more than just a little arrogant.”   The second response says to me “this person has left room for everyone to save face, has presented evidence to the contrary and is thinking about moving the ball forward and getting it right rather than attacking someone for getting it wrong.” It’s the idea of questioning a statement rather than attacking a person.   Perhaps you have a different take. Maybe you think the “direct” approach is best – and maybe that’s worked for you. Something to consider is what you’ve really accomplished while using that first method. Sure, the info you provide is correct, and perhaps someone out there won’t shrink a database because of your response – but perhaps you’ve turned a lot more people off, and now they won’t listen to your other valuable information. You’ll be an expert, but another one of the nameless, arrogant jerks in technology. And I don’t think anyone likes to be thought of that way.   OK, I’ll get down off of the high-horse now. And I’ll keep the title of this entry (said to me by my grandmother when I was a little kid) in mind when I dismount. Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!

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  • ASP.NET Web API - Screencast series Part 2: Getting Data

    - by Jon Galloway
    We're continuing a six part series on ASP.NET Web API that accompanies the getting started screencast series. This is an introductory screencast series that walks through from File / New Project to some more advanced scenarios like Custom Validation and Authorization. The screencast videos are all short (3-5 minutes) and the sample code for the series is both available for download and browsable online. I did the screencasts, but the samples were written by the ASP.NET Web API team. In Part 1 we looked at what ASP.NET Web API is, why you'd care, did the File / New Project thing, and did some basic HTTP testing using browser F12 developer tools. This second screencast starts to build out the Comments example - a JSON API that's accessed via jQuery. This sample uses a simple in-memory repository. At this early stage, the GET /api/values/ just returns an IEnumerable<Comment>. In part 4 we'll add on paging and filtering, and it gets more interesting.   The get by id (e.g. GET /api/values/5) case is a little more interesting. The method just returns a Comment if the Comment ID is valid, but if it's not found we throw an HttpResponseException with the correct HTTP status code (HTTP 404 Not Found). This is an important thing to get - HTTP defines common response status codes, so there's no need to implement any custom messaging here - we tell the requestor that the resource the requested wasn't there.  public Comment GetComment(int id) { Comment comment; if (!repository.TryGet(id, out comment)) throw new HttpResponseException(HttpStatusCode.NotFound); return comment; } This is great because it's standard, and any client should know how to handle it. There's no need to invent custom messaging here, and we can talk to any client that understands HTTP - not just jQuery, and not just browsers. But it's crazy easy to consume an HTTP API that returns JSON via jQuery. The example uses Knockout to bind the JSON values to HTML elements, but the thing to notice is that calling into this /api/coments is really simple, and the return from the $.get() method is just JSON data, which is really easy to work with in JavaScript (since JSON stands for JavaScript Object Notation and is the native serialization format in Javascript). $(function() { $("#getComments").click(function () { // We're using a Knockout model. This clears out the existing comments. viewModel.comments([]); $.get('/api/comments', function (data) { // Update the Knockout model (and thus the UI) with the comments received back // from the Web API call. viewModel.comments(data); }); }); }); That's it! Easy, huh? In Part 3, we'll start modifying data on the server using POST and DELETE.

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