andras - Page 2 - Developer IT

Silverlight Cream for March 28, 2010 -- #823

- by Dave Campbell

In this Issue: Michael Washington, Andy Beaulieu, Bill Reiss, jocelyn, Shawn Wildermuth, Cameron Albert, Shawn Oster, Alex Yakhnin, ondrejsv, Giorgetti Alessandro, Jeff Handley, SilverLaw, deepm, and Kyle McClellan. Shoutouts: If I've listed this before, it's worth another... Introduction to Prototyping with SketchFlow (twelve video series) and on the same page is Creating a Beehive Game with Behaviors in Blend 3 (ten video series) Shawn Oster announced his Slides + Code + Video from ‘An Introduction to Developing Applications for Microsoft Silverlight’ from MIX10 Tim Heuer announced earlier this week: Silverlight Client for Facebook updated for Silverlight 4 RC Nikhil Kothari announced the availability of his MIX10 Talk - Slides and Code András Velvárt backed up his great MIX09 effort with MIX10.Zoomery.com... everything in one DZ effort... thanks András! Andy Beaulieu posted his material for his Code Camp 13 in Waltham: Windows Phone: Silverlight for Casual Games From SilverlightCream.com: Silverlight MVVM - The Revolution Has Begun Michael Washington did an awesome tutorial on MVVM and Silverlight creating a simple Silverlight File Manager. The post has a link to the tutorial at CodeProject... great tutorial. Windows Phone 7 + Silverlight Performance Andy Beaulieu has a post up we should all bookmark... getting a handle on the graphics performance of our app on WP7. Great examples, and external links. Space Rocks game step 6: Keyboard handling Bill Reiss has a post up about keyboard input for the WP7 game he's building ... this is Episode 6 ... you're working along with him, right? Panoramic Navigation on Windows Phone 7 with No Code! jocelyn at InnovativeSingapore (I found this by way of Shawn's post), has a Panoramic Navigation template out there for WP7 for all of us to grab... great post about it too. My First WP7 Application Shawn Wildermuth has been playing with WP7 development and has his XBOX Game library app up on the emulator... all with source of course Silverlight and Windows Phone 7 Game Cameron Albert built a web-based game called 'Shape Attack' and also did it for WP7 to compare the performance... check it out for yourself, but hey, it's game source for the phone... cool :) Changing the Onscreen Keyboard layout in Silverlight for Windows Phone using InputScope Shawn Oster has a cool post on changing the keyboard on WP7 to go along with what you're expecting the user to type... how cool is that?? Deep Zoom on WP7 Check out the quick work Alex Yakhnin made of putting DeepZoom on WP7... all source included. How to: Create a sketchy Siverlight GroupBox in Blend/SketchFlow ondrejsv has the xaml up to take Tim Greenfield's GroupBox control and insert it into SketchFlow. Silverlight / Castle Windsor – implementing a simple logging framework Giorgetti Alessandro posted about CastleWindsor for Silverlight, and a logging system inherited from LevelFilteredLogger in the absence of Log4Net. DomainDataSource in a ViewModel Jeff Handley responds to a common forum post about using DomainDataSource in a ViewModel. Read his comments on AutoLoad and ElementName Bindins. Digital Jugendstil TextEffect (Art Nouveau) - Silverlight 3 SilverLaw has a cool TagCloud demo and a UserControl he calls Art Nouveau up at the Expression Gallery... not for a business app, I don't think :) Configuring your DomainService for a Windows Phone 7 application deepm discusses RIA Services for WP7 and how to enable a WP7 app to communicate with a DomainService. Writing a Custom Filter or Parameter for DomainDataSource Kyle McClellan by way of Jeff Handley's blog, is discussing how to leverage the custom parameter types you defined in the previous version of RIA Services. Stay in the 'Light! Twitter SilverlightNews | Twitter WynApse | WynApse.com | Tagged Posts | SilverlightCream Join me @ SilverlightCream | Phoenix Silverlight User Group Technorati Tags: Silverlight Silverlight 3 Silverlight 4 Windows Phone MIX10

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Silverlight Cream for January 13, 2011 -- #1026

- by Dave Campbell

In this Issue: András Velvárt, Tony Champion, Joost van Schaik, Jesse Liberty, Shawn Wildermuth, John Papa, Michael Crump, Sacha Barber, Alex Knight, Peter Kuhn, Senthil Kumar, Mike Hole, and WindowsPhoneGeek. Above the Fold: Silverlight: "Create Custom Speech Bubbles in Silverlight." Michael Crump WP7: "Architecting WP7 - Part 9 of 10: Threading" Shawn Wildermuth Expression Blend: "PathListBox: Text on the path" Alex Knight From SilverlightCream.com: Behaviors for accessing the Windows Phone 7 MarketPlace and getting feedback András Velvárt shares almost insider information about how to get some user interaction with your WP7 app in the form of feedback ... he has 4 behaviors taken straight from his very cool SufCube app that he's sharing. Reloading a Collection in the PivotViewer Tony Champion keeps working with the PivotViewer ... this time discussing the fact that you can't Reload or Refresh the current collection from the server ... at least not initially, but he did find one :) Tombstoning MVVMLight ViewModels with SilverlightSerializer on Windows Phone 7 Joost van Schaik takes a shot at helping us all with Tombstoning a WP7 app... he's using Mike Talbot's SilverlightSerializer and created extension methods for it for tombstoning that he's willing to share with us. Windows Phone From Scratch #17: MVVM Light Toolkit Soup To Nuts Part 2 Jesse Liberty is up to Part 17 in his WP7 series, and this is the 2nd post on MVVMLight and WP7, and is digging into behaviors. Architecting WP7 - Part 9 of 10: Threading Shawn Wildermuth is up to part 9 of 10 in his series on Architecting WP7 apps. This episode finds Shawn discussing Threading ... know how to use and choose between BackgroundWorker and ThreadPool? ... Shawn will explain. Silverlight TV 57: Performance Tuning Your Apps In the latest Silverlight TV, John Papa chats with Mike Cook about tuning your Silverlight app to get the performance up there where your users will be happy. Create Custom Speech Bubbles in Silverlight. Michael Crump's already gotten a lot of airplay out of this, but it's so cool.. comic-style callout shapes without using the dlls that you normally would... in other words, paths, and very cool hand-drawn looks on some too... very cool, Michael! Showcasing Cinch MVVM framework / PRISM 4 interoperability Sacha Barber has a post up on CodeProject that demonstratest using Cinch and Prism4 together... handily using MEF since Cinch relies on MEFedMVVM... this is a heck of a post... lots of code, lots of explanations. PathListBox: Text on the path Alex Knight keeps making this PathListBox series better ... this time he is putting text on the path... moving text... too cool, Alex! Windows Phone 7: Pinch Gesture Sample Peter Kuhn digs into the WP7 toolkit and examines GestureListener, pinch events, and clipping... examples and code supplied. How to change the StartPage of the Windows Phone 7 Application in Visual Studio 2010 ? Senthil Kumar discusses how to change the StartPage of your WP7 app, or get the program running if you happen to move or rename MainPage.xaml WP7 Text Boxes – OnEnter (my 1st Behaviour) Mike Hole has a post up about the issue with the keyboard appearing in front of the textbox, and maybe using the enter key to drop it... and he's developed a behavior for that process. WP7 ContextMenu in depth | Part1: key concepts and API WindowsPhoneGeek has some good articles that I haven't posted, but I'll catch up. This one is a nice tutorial on the WP7 Context menu... good explanation, diagrams, and code. Stay in the 'Light! Twitter SilverlightNews | Twitter WynApse | WynApse.com | Tagged Posts | SilverlightCream Join me @ SilverlightCream | Phoenix Silverlight User Group Technorati Tags: Silverlight Silverlight 3 Silverlight 4 Windows Phone MIX10

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"Folyamatosan elérheto, üzletileg kritikus adatbázisok" eloadások letölthetok

- by Fekete Zoltán

Ferbruár 26-án az IQSYS és az Oracle közösen üzleti reggelit rendezett. "Folyamatosan elérheto, üzletileg kritikus adatbázisok" címmel. A téma bevezeto eloadását Kovács András tartotta. Cseke Attila a Magyar Telekom rendszerei kapcsán a "Nagyméretu, üzletileg kritikus adatbázisok üzemeltetési kihívásai"-ról beszélt. A rendezvényen eloadást tartott Mosolygó Ferenc kollégám, aki az Oracle maximális rendelkezésre állású referencia architektúráját ismertette. Jómagam az "Ideális nagy teljesítményu hibaturo környezet Oracle adatbázisok számára: Database Machine, Exadata" címmel tartottam eloadást. A rendezvény eloadásai letölthetok innen: "Folyamatosan elérheto, üzletileg kritikus adatbázisok".

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Silverlight Cream for May 24, 2010 -- #868

- by Dave Campbell

In this Issue: Victor Gaudioso, Weidong Shen, SilverLaw, Alnur Ismail, Damon Payne, and Karl Erickson. Shoutout: Tim Greenfield posted his slides and materials (not the padlock yet) from Portland Code Camp: Rx for Silverlight at Portland CodeCamp András Velvárt posted his material from his User Group talk: 20 Silverlight 4 demos in one zip file From SilverlightCream.com: New Silverilght Video Tutotial: How to Build Your Very Own Tutorial Cam Do you like the video Victor Gaudioso has of himself in his tutorials? well... in this one, he explains how to go about doing just that for yourself! A Sample Silverlight 4 Application Using MEF, MVVM, and WCF RIA Services - Part 1 Weidong Shen has part 1 of a new series up on Code Project about Siverlight, MVVM, MEF, and WCF RIA Services. Silver Spot Light - Silverlight 4 SilverLaw posted a control to the Expression Gallery and I have to agree with his comment "You' ll love to switch it on and off & on and off & on and off ... ;-)" A Distributable (.exe) Silverlight OOB Application Alnur Ismail has a step-by-step post up on building an OOB app deployable in an exe file. You'll need a file from a post by Tim, but there's a link in the post. DataContract based Binary Serialization for Silverlight Damon Payne serves up on a promise to post about a subject he's been discussing: DataContract based Binary Serialization for Silverlight... and he's writing about the process he followed, plus all the code is available. Creating a Custom Out-of-Browser Window in Silverlight 4 Karl Erickson at the Silverlight SDK blog discusses OOB visualization effects... what you can and can't do, and what limitations you're up against. Stay in the 'Light! Twitter SilverlightNews | Twitter WynApse | WynApse.com | Tagged Posts | SilverlightCream Join me @ SilverlightCream | Phoenix Silverlight User Group Technorati Tags: Silverlight Silverlight 3 Silverlight 4 Windows Phone MIX10

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Silverlight Cream for February 05, 2011 -- #1041

- by Dave Campbell

In this Issue: Peter Kuhn, Mike Ormond(-2-, -3-), WindowsPhoneGeek, Daniel N. Egan, Phil Middlemiss(-2-), Max Paulousky, Michael Washington. Above the Fold: Silverlight: "Designing for Browser-Zoom: Part 2" Phil Middlemiss WP7: "Talking about Converters in WP7 | Coding4fun toolkit converters in depth" WindowsPhoneGeek Lightswitch: "LightSwitch: Can We Handle The Truth?" Michael Washington Shoutouts: András Velvárt has a video up of some awesome changes he has planned for SurfCube, check it out: SurfCube V2 - 3D Web Browser for Windows Phone 7, now with tabs! From SilverlightCream.com: Silverlight for keyboard junkies Peter Kuhn has a post up talking about the issues surrounding trying to use the tab key to navigate between controls... and follows it up with a behavior that resolves it. Windows Phone 7 Content On Demand Mike Ormond has a batch of WP7 Videos up... this first is "Windows Phone 7: A Different Kind of Phone" with Andrej Radinger. Windows Phone 7 Content on Demand Pt 2 Mike Ormond's 2nd WP7 video is "Understanding the Windows Phone 7 Development Tools and Getting Started" with Maarten Struys Windows Phone 7 Content on Demand Pt 3 Mike Ormond's 3rd WP7 Content on Demand is "Games Programming on Windows Phone 7 with Silverlight and XNA" with Rob Miles Talking about Converters in WP7 | Coding4fun toolkit converters in depth WindowsPhoneGeek is discussing value converters in his latest post... value converters for WP7... and the ones in the Coding4Fun toolkit to be exact... everything you wanted to know about them but didn't know to ask :) WP7 Developer Tools–Jan Update Daniel N. Egan has information up about the new WP7 Developer Tools release. Designing for Browser-Zoom: Part 1 Phil Middlemiss has both parts of a series on Browser Zoom up... this first part covers the zoom and different pieces involved. Designing for Browser-Zoom: Part 2 Phil Middlemiss's part 2 shows us some design considerations and visual states, including an attached behavior you can use in Blend to respond to the zoom event. Windows Phone Copy-Paste: How It Looks and Works Max Paulousky has the first post I've seen on WP7 Copy/Paste up... of course it's still in the emulator, but hey... that's better than nothing, right? LightSwitch: Can We Handle The Truth? Have you been playing with Lightswitch? Well... Michael Washington has, and it's got his interest up far enough that he's waving the flags trying to attract everyone else over there as well... see if you agree. Stay in the 'Light! Twitter SilverlightNews | Twitter WynApse | WynApse.com | Tagged Posts | SilverlightCream Join me @ SilverlightCream | Phoenix Silverlight User Group Technorati Tags: Silverlight Silverlight 3 Silverlight 4 Windows Phone MIX10

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Silverlight Firestarter thoughts, and thanks to one and all!

- by Dave Campbell

A few metrics that of course got out of hand, but some may find interesting: 1/2 My share of the MVP of the Year award in February of 2009 with Laurent Bugnion 2 Number of degrees I hold: B.S., M.S. Electrical Engineering 3 Number of years in the U.S. Army 3.5 Number of years SilverlighCream has been posted 4 Number of times awarded MVP 6 Number of professional positions I've worked: Antenna Rigger, Boilermaker, Musician, Electronic Technician, Hardware Engineer, Software Engineer 16 Number of companies I've worked for during my career as an Engineer 19 Age at which I turned my first line of code 28 Age at which I hit the workforce as an Engineer 33 Number of years working as an Engineer 43 Number of years writing code 62 Number of years since instantiation 116 Number of tags to search SilverlightCream with 645 Number of blogs I view to find articles (at this moment) 664 Number of articles tagged wp7dev at SilverlightCream right now 700 Number of Twitter followers for WynApse 981 Number of individual bloggers in the SilverlightCream database 1002 Number of SilverlightCream blogposts 1100 Number of people live in Redmond for the Firestarter (I think) 1428 Number of total blogposts at GeeksWithBlogs (not counting this one) 4200 Number of Feedburner subscribers (approximately) 6500 Number of Twitter followers for SilverlightNews (approximately) 7087 Number of posts tagged and aggregated at SilverlightCream right now 13000 Number of people registered to watch the Firestarter online (I think) The overwhelming feeling I have returning from the Silverlight Firestarter: Priceless There is absolutely no way that I could personally thank everyone that over the last few years has held their hand out and offered me a step up to get to the point that Scott Guthrie called me out in his keynote. So I'm just going to hit the highlights here... Scott Guthrie Thanks for not only being the level you are at Microsoft, but for being so approachable, easy to talk to, willing to help everyone, and above all knowledgable. My first level manager at my last position asked if Visual Studio was a graphics program... and you step up to a laptop at a conference and type "File->New Program" ... 'nuff said... oh yeah, thanks for the shoutout! John Papa Thanks for being a good friend, ramroding the Firestarter, being a great guy to be around, and for the poster... holy crap is that cool. Tim Heuer Thanks for all you did as a great DE in Phoenix, and for helping out so many of us, of course being a great guy, and for the poster as well... I think you and John shared that task. In no order at all my buddy Michael Washington, Laurent Bugnion (the other half of the first Silverlight MVP of the Year) Tim Sneath, Mike Harsh, Chad Campbell and Bryant Likes (from back in the day), Adam Kinney, Jesse Liberty, Jeff Paries, Pete Brown, András Velvárt, David Kelly, Michael Palermo, Scott Cate, Erik Mork, and on and on... don't feel bad if your name didn't appear, I have simply too many supporters to name. Silverlight Firestarter Indeed All the people mentioned here, and all the MVPs knew Silverlight was NOT dead, but because of a very unfortunate circumstance, the popular media opinion became that. Consequently the Firestarter exploded from a laid-back event to a global conference. People worked their ass off getting bits ready and presentations using those bits. All to stem the flow of misinformation. All involved please accept my personal thanks for an absolutely awesome job. I had the priviledge of watching the 'prep' on Wednesday afternoon, and was blown away the first time I saw the 3D demo... and have been blown away every time I've seen it since. Not to mention all the other goodness in Silverlight 5. Yes I hit 1000 on my blog, but more importantly, all of you are blogging and using Silverlight, and Microsoft hit one completely out of the park... no... they knocked it out of the neighborhood with the Firestarter. It was amazing to be there for it, and it will be awesome to use the new bits as we get them. Keep reading, there's tons more to come with Silverlight and SilverlightCream following along behind. As usual, this old hacker is humbled to be allowed to play with all the cool kids... Thanks one and all for everything, and Stay in the 'Light

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php function to make slug (url string)

- by andufo

function gen_slug($str){ # special accents $a = array('À','Á','Â','Ã','Ä','Å','Æ','Ç','È','É','Ê','Ë','Ì','Í','Î','Ï','Ð','Ñ','Ò','Ó','Ô','Õ','Ö','Ø','Ù','Ú','Û','Ü','Ý','ß','à','á','â','ã','ä','å','æ','ç','è','é','ê','ë','ì','í','î','ï','ñ','ò','ó','ô','õ','ö','ø','ù','ú','û','ü','ý','ÿ','A','a','A','a','A','a','C','c','C','c','C','c','C','c','D','d','Ð','d','E','e','E','e','E','e','E','e','E','e','G','g','G','g','G','g','G','g','H','h','H','h','I','i','I','i','I','i','I','i','I','i','?','?','J','j','K','k','L','l','L','l','L','l','?','?','L','l','N','n','N','n','N','n','?','O','o','O','o','O','o','Œ','œ','R','r','R','r','R','r','S','s','S','s','S','s','Š','š','T','t','T','t','T','t','U','u','U','u','U','u','U','u','U','u','U','u','W','w','Y','y','Ÿ','Z','z','Z','z','Ž','ž','?','ƒ','O','o','U','u','A','a','I','i','O','o','U','u','U','u','U','u','U','u','U','u','?','?','?','?','?','?'); $b = array('A','A','A','A','A','A','AE','C','E','E','E','E','I','I','I','I','D','N','O','O','O','O','O','O','U','U','U','U','Y','s','a','a','a','a','a','a','ae','c','e','e','e','e','i','i','i','i','n','o','o','o','o','o','o','u','u','u','u','y','y','A','a','A','a','A','a','C','c','C','c','C','c','C','c','D','d','D','d','E','e','E','e','E','e','E','e','E','e','G','g','G','g','G','g','G','g','H','h','H','h','I','i','I','i','I','i','I','i','I','i','IJ','ij','J','j','K','k','L','l','L','l','L','l','L','l','l','l','N','n','N','n','N','n','n','O','o','O','o','O','o','OE','oe','R','r','R','r','R','r','S','s','S','s','S','s','S','s','T','t','T','t','T','t','U','u','U','u','U','u','U','u','U','u','U','u','W','w','Y','y','Y','Z','z','Z','z','Z','z','s','f','O','o','U','u','A','a','I','i','O','o','U','u','U','u','U','u','U','u','U','u','A','a','AE','ae','O','o'); return strtolower(preg_replace(array('/[^a-zA-Z0-9 -]/','/[ -]+/','/^-|-$/'),array('','-',''),str_replace($a,$b,$str))); } Works great, but i've found some cases in which it fails: echo gen_slug('andrés'); returns andras instead of andres why? any ideas on the preg_replace parameters?

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Silverlight Cream Monday WP7 App Review # 1

- by Dave Campbell

I'm going to try something here... if it seems useful, I'll continue, if it doesn't, I'll stop... so give me feedback! There are *lots* of Apps in the WP7 Marketplace, and heaven help me, but the Marketplace sucks for finding stuff. I won't rehash what's already been said in the blogs, but I agree with one and all. I went out last Saturday to find 2 apps that I knew were released, and couldn't do so on my device. Even in the Zune app, it took quite a while to find them... ok, I'll back off a bit, because I just found out I can do 'Search' now if I know the name... I didn't think that was working before. So my thought is on Monday (like today), I will post a review of 5 apps/games I either use or have played with on my device. These are strictly my opinions, you understand, but hey... it's better than a poke in the eye with an iPhone! A few disclaimers: Feel free to write me about your app and tell me about it. While it would be very cool to receive a whole bunch of xap files to review, at this point, for technical reasons, I'm unable to side-load my device. Since I plan on only doing this one day a week, and only 5, I may never get caught up, so if you send me some info, be patient. Re: games ... remember I'm old... I'm from the era of Colossal Cave and Zork. Duke-Nukem 2D and Captain Comic were awesome. I don't own an XBOX or any other game system, so take game reviews from my perspective -- who knows, it may be refreshing :) I won't pay for an app or game just to try it. If you expect me to test-drive your app, it's going to have to have a Free Trial. In this Issue: Jingo! is the first app I bought, just to see what the experience was like. It's very much like a game we used to play in school in the Army in 1971 on paper we passed around. Sort of a cross between hangman and Mastermind, you try to figure out the hidden word in 5 tries. You get really good at 5-letter words after a while. I like this because you have to think, and you're not pressured by a clock Jingo! is by James Furdell and is $1.99 I reviewed René Schulte's Pictures Lab a while back, and have not changed my mind. This is an excellent app for playing with any photo on your device... one you've just taken, one you've synced from your PC, or one you've saved from email. I like this because you can get some cool effects for your photos, and it just works. Pictures Lab is by Schulte Software Development and is $1.99 Since I work as a consultant, and from home, I wanted something I could track my time with. I've test-driven all the contenders I could find so far on the phone, and so far I like ONTRACK! the best. If asked, I have some suggestions, but it's probably just the way I work or think. What I do like is I can tap a project to start/stop/restart a counter, and at the end of the day it shows me how much time I've been working. If there's a way to make an adjustment in case you forget to tap the counter, I don't know how to do it, and that's my biggest complaint. I like this because you can get a daily readout which you can also email as a spreadsheet. The daily results display is very good. ONTRACK! is by Qmino and is $2.99 Remember Item 4 above... I've been playing guitar for 48 years... obviously since before the invention of 'tuners', so I'm not as dependent upon these as some folks are. I've tried some in the past and have always felt I can do just as good by ear (I have perfect relative pitch). So, I gave this app by András Velvárt a dance just to see how it works, and it is surprisingly good. If you're used to one of the stage tuners this may take a little getting used to, but it does the job. The difference with this one is there is no real 'null' point inside which you can think your guitar is in tune. The soundwave stays visible on the device, and if it's moving to the right, your string is flat, if it's moving to the left, your string is sharp. Getting it exact might be tricky, but it is exact! If you need to rely on a tuner, this is a good choice in my opinion, exactly because of the sensitivity.. tune up with this and you're dead-on. Guitar Tuner is by Kinabalu Innovation Limited and is $0.99 Popper 2 is the WP7 version of a wildly popular game by Bill Reiss named Dr. Popper. You can get a trial, or you can now get a free lite version of the game. Popper 2 is a fast-paced bubble breaker game. I find it something fun to play when I just want to buzz out, but maybe the best review is that my daughter didn't want to give my phone back when I showed it to her, and always wants to grab my phone to play 'that game'. A fun distraction with great graphics and a great price Popper 2 is by Blue Rose Systems, LLC and is $1.29 Let me know what you think of the idea of doing reviews, or the layout/whatever, and Stay in the 'Light! Twitter SilverlightNews | Twitter WynApse | WynApse.com | Tagged Posts | SilverlightCream Join me @ SilverlightCream | Phoenix Silverlight User Group Technorati Tags: Silverlight Silverlight 3 Silverlight 4 Windows Phone MIX10

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Why might a System.String object not cache its hash code?

- by Dan Tao

A glance at the source code for string.GetHashCode using Reflector reveals the following (for mscorlib.dll version 4.0): public override unsafe int GetHashCode() { fixed (char* str = ((char*) this)) { char* chPtr = str; int num = 0x15051505; int num2 = num; int* numPtr = (int*) chPtr; for (int i = this.Length; i > 0; i -= 4) { num = (((num << 5) + num) + (num >> 0x1b)) ^ numPtr[0]; if (i <= 2) { break; } num2 = (((num2 << 5) + num2) + (num2 >> 0x1b)) ^ numPtr[1]; numPtr += 2; } return (num + (num2 * 0x5d588b65)); } } Now, I realize that the implementation of GetHashCode is not specified and is implementation-dependent, so the question "is GetHashCode implemented in the form of X or Y?" is not really answerable. I'm just curious about a few things: If Reflector has disassembled the DLL correctly and this is the implementation of GetHashCode (in my environment), am I correct in interpreting this code to indicate that a string object, based on this particular implementation, would not cache its hash code? Assuming the answer is yes, why would this be? It seems to me that the memory cost would be minimal (one more 32-bit integer, a drop in the pond compared to the size of the string itself) whereas the savings would be significant, especially in cases where, e.g., strings are used as keys in a hashtable-based collection like a Dictionary<string, [...]>. And since the string class is immutable, it isn't like the value returned by GetHashCode will ever even change. What could I be missing? UPDATE: In response to Andras Zoltan's closing remark: There's also the point made in Tim's answer(+1 there). If he's right, and I think he is, then there's no guarantee that a string is actually immutable after construction, therefore to cache the result would be wrong. Whoa, whoa there! This is an interesting point to make (and yes it's very true), but I really doubt that this was taken into consideration in the implementation of GetHashCode. The statement "therefore to cache the result would be wrong" implies to me that the framework's attitude regarding strings is "Well, they're supposed to be immutable, but really if developers want to get sneaky they're mutable so we'll treat them as such." This is definitely not how the framework views strings. It fully relies on their immutability in so many ways (interning of string literals, assignment of all zero-length strings to string.Empty, etc.) that, basically, if you mutate a string, you're writing code whose behavior is entirely undefined and unpredictable. I guess my point is that for the author(s) of this implementation to worry, "What if this string instance is modified between calls, even though the class as it is publicly exposed is immutable?" would be like for someone planning a casual outdoor BBQ to think to him-/herself, "What if someone brings an atomic bomb to the party?" Look, if someone brings an atom bomb, party's over.

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