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• LINQ/LAMBDA filter query by date [on hold]

  - by inquisitive_one

  I'm trying to use LINQ to SQL to retrieve earnings data for a particular date range. Currently the table is set up as follows: Comp Eps Year Quarter IBM .5 2012 2 IBM .65 2012 3 IBM .60 2012 4 IBM .5 2011 2 IBM .7 2013 1 IBM .8 2013 2 Except for Eps, all fields have a data type of string or char. Eps has a data type of double. Here's my code: var myData = myTable .Where(t => t.Comp.Equals("IBM") && Convert.Int32(string.Format("{0}{1}", t.Year, t.Quarter)) <= 20131); I get the following error when I tried that code: Method 'System.String Format(System.String, System.Object, System.Object)' has no supported translation to SQL How can I select all Eps that has a year & quarter less than "20132" using a lambda expression?

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• The sign of a true manager is delegation (C# style)

  - by MarkPearl

  Today I thought I would write a bit about delegates in C#. Up till recently I have managed to side step any real understanding of what delegates do and why they are useful – I mean, I know roughly what they do and have used them a lot, but I have never really got down dirty with them and mucked about. Recently however with my renewed interest in Silverlight delegates came up again as a possible solution to a particular problem, and suddenly I found myself opening a bland little console application to just see exactly how far I could take delegates with my limited knowledge. So, let’s first look at the MSDN definition of delegates… A delegate declaration defines a reference type that can be used to encapsulate a method with a specific signature. A delegate instance encapsulates a static or an instance method. Delegates are roughly similar to function pointers in C++; however, delegates are type-safe and secure. Well, don’t you love MSDN for such a useful definition. I must give it credit though… later on it really explains it a bit better by saying “A delegate lets you pass a function as a parameter. The type safety of delegates requires the function you pass as a delegate to have the same signature as the delegate declaration.” A little more reading up on delegates mentions that delegates are similar to interfaces in that they enable the separation of specification and implementation. A delegate declares a single method, while an interface declares a group of methods. So enough reading - lets look at some code and see a basic example of a delegate… Let’s assume we have a console application with a simple delegate declared called AdjustValue like below… class Program { private delegate int AdjustValue(int val); static void Main(string[] args) { } } In a sense, all we have said is that we will be creating one or more methods that follow the same pattern as AdjustValue – i.e. they will take one input value of type int and return an integer. We could then expand our code to have various methods that match the structure of our delegate AdjustValue (remember the structure is int xxx (int xxx)) class Program { private delegate int AdjustValue(int val); private static int Dbl(int val) { return val * 2; } private static int AlwaysOne(int val) { return 1; } static void Main(string[] args) { } }  Above I have expanded my project to have two methods, one called Dbl and the other AlwaysOne. Dbl always returns double the input val and AlwaysOne always returns 1. I could now declare a variable and assign it to be one of those functions, like the following… class Program { private delegate int AdjustValue(int val); private static int Dbl(int val) { return val * 2; } private static int AlwaysOne(int val) { return 1; } static void Main(string[] args) { AdjustValue myDelegate; myDelegate = Dbl; Console.WriteLine(myDelegate(1).ToString()); Console.ReadLine(); } } In this instance I have declared an instance of the AdjustValue delegate called myDelegate; I have then told myDelegate to point to the method Dbl, and then called myDelegate(1). What would the result be? Yes, in this instance it would be exactly the same as me calling the following code… static void Main(string[] args) { Console.WriteLine(Dbl(1).ToString()); Console.ReadLine(); }   So why all the extra work for delegates when we could just do what we did above and call the method directly? Well… that separation of specification to implementation comes to mind. So, this all seems pretty simple. Let’s take a slightly more complicated variation to the console application. Assume that my project is the same as the one previously except that my main method is adjusted as follows… static void Main(string[] args) { AdjustValue myDelegate; myDelegate = Dbl; myDelegate = AlwaysOne; Console.WriteLine(myDelegate(1).ToString()); Console.ReadLine(); } What would happen in this scenario? Quite simply “1” would be written to the console, the reason being that myDelegate was last pointing to the AlwaysOne method before it was called. Make sense? In a way, the myDelegate is a variable method that can be swapped and changed when needed. Let’s make the code a little more confusing by using a delegate in the declaration of another delegate as shown below… class Program { private delegate int AdjustValue(InputValue val); private delegate int InputValue(); private static int Dbl(InputValue val) { return val()*2; } private static int GetInputVal() { Console.WriteLine("Enter a whole number : "); return Convert.ToInt32(Console.ReadLine()); } static void Main(string[] args) { AdjustValue myDelegate; myDelegate = Dbl; Console.WriteLine(myDelegate(GetInputVal).ToString()); Console.ReadLine(); } }   Now it gets really interesting because it looks like we have passed a method into a function in the main method by declaring… Console.WriteLine(myDelegate(GetInputVal).ToString()); So, what it the output? Well, try take a guess on what will happen – then copy the code and see if you got it right. Well that brings me to the end of this short explanation of Delegates. Hopefully it made sense!

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• "find" command and piping its output through another program

  - by Charbel

  this is not an Ubuntu specific quesion, it applies to all unix/linux. how can I run a command like this: find . -maxdepth 1 -type d -print -exec svn info "{}" | grep URL \; the command above doesn't do what I want, I can't seem to pipe the output of the svn info to grep. This works, but the output contains much more than I need: find . -maxdepth 1 -type d -print -exec svn info "{}" \; Any ideas?

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• Validation and Error Generation when using the Data Mapper Pattern

  - by AndyPerlitch

  I am working on saving state of an object to a database using the data mapper pattern, but I am looking for suggestions/guidance on the validation and error message generation step (step 4 below). Here are the general steps as I see them for doing this: (1) The data mapper is used to get current info (assoc array) about the object in db: +=====================================================+ | person_id | name | favorite_color | age | +=====================================================+ | 1 | Andy | Green | 24 | +-----------------------------------------------------+ mapper returns associative array, eg. Person_Mapper::getPersonById($id) : $person_row = array( 'person_id' => 1, 'name' => 'Andy', 'favorite_color' => 'Green', 'age' => '24', ); (2) the Person object constructor takes this array as an argument, populating its fields. class Person { protected $person_id; protected $name; protected $favorite_color; protected $age; function __construct(array $person_row) { $this->person_id = $person_row['person_id']; $this->name = $person_row['name']; $this->favorite_color = $person_row['favorite_color']; $this->age = $person_row['age']; } // getters and setters... public function toArray() { return array( 'person_id' => $this->person_id, 'name' => $this->name, 'favorite_color' => $this->favorite_color, 'age' => $this->age, ); } } (3a) (GET request) Inputs of an HTML form that is used to change info about the person is populated using Person::getters <form> <input type="text" name="name" value="<?=$person->getName()?>" /> <input type="text" name="favorite_color" value="<?=$person->getFavColor()?>" /> <input type="text" name="age" value="<?=$person->getAge()?>" /> </form> (3b) (POST request) Person object is altered with the POST data using Person::setters $person->setName($_POST['name']); $person->setFavColor($_POST['favorite_color']); $person->setAge($_POST['age']); *(4) Validation and error message generation on a per-field basis - Should this take place in the person object or the person mapper object? - Should data be validated BEFORE being placed into fields of the person object? (5) Data mapper saves the person object (updates row in the database): $person_mapper->savePerson($person); // the savePerson method uses $person->toArray() // to get data in a more digestible format for the // db gateway used by person_mapper Any guidance, suggestions, criticism, or name-calling would be greatly appreciated.

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• Tab autocomplete in terminal is not behaving properly

  - by CaptSaltyJack

  There's something odd about my autocomplete in the gnome terminal. I used to be able to type cp Downtab to get cp Downloads/, and then type Jettab to end up with cp Downloads/Jet\ Pack\ Instructions.pdf But now, when I have cp Down typed and hit tab, I get cp Downloads with a space afterwards. And if I backspace that and make it say cp Downloads/Jet and hit tab, I get cp Downloads/Jet Pack Instructions.pdf without the backslashes. It wasn't like this before. How do I fix this? EDIT: There's a problem with my /etc/bash_completion file, it seems. Just not sure what.

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• Does putting types/functions inside namespace make compiler's parsing work easy?

  - by iammilind

  Retaining the names inside namespace will make compiler work less stressful!? For example: // test.cpp #include</*iostream,vector,string,map*/> class vec { /* ... */ }; Take 2 scenarios of main(): // scenario-1 using namespace std; // comment this line for scenario-2 int main () { vec obj; } For scenario-1 where using namespace std;, several type names from namespace std will come into global scope. Thus compiler will have to check against vec if any of the type is colliding with it. If it does then generate error. In scenario-2 where there is no using namespace, compiler just have to check vec with std, because that's the only symbol in global scope. I am interested to know that, shouldn't it make the compiler little faster ?

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• How to create reproducible probability in map generation?

  - by nickbadal

  So for my game, I'm using perlin noise to generate regions of my map (water/land, forest/grass) but I'd also like to create some probability based generation too. For instance: if(nextInt(10) > 2 && tile.adjacentTo(Type.WATER)) tile.setType(Type.SAND); This works fine, and is even reproduceable (based on a common seed) if the nextInt() calls are always in the same order. The issue is that in my game, the world is generated on demand, based on the player's location. This means, that if I explore the map differently, and the chunks of the map are generated in a different order, the randomness is no longer consistent. How can I get this sort of randomness to be consistent, independent of call order? Thanks in advance :)

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• VMware Player and Ubuntu 12.04 - Full Screen

  - by DotNetStudent

  I have installed VMware Player 4.0.2 under Ubuntu 12.04 (Final) and, apart from having to patch the modules, everything went smoothly. However, there's an irritating behavior when toggling full screen mode: toggling full screen (using Virtual Machine Toggle Full Screen or Ctrl + Alt + Return), minimizing the player and maximizing it again changes the resolution of the guest to some strange one and the player gets "nested" between GNOME3's taskbar as every other of Ubuntu's native windows. To switch to full screen again I have to Ctrl + Alt + Return twice. Can anyone please tell me if this is the nromal, expected behavior? Is there any way of "correcting" it? The host operating system is Ubuntu 12.04 (Final) and the guest is Windows 7 (both 64 bits).

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• Free Pluralsight Videos for this week

  - by TATWORTH

  Pluralsight have issued two free videoshttp://blog.pluralsight.com/2012/09/05/video-end-the-global-pollution-crisis-in-javascript/http://blog.pluralsight.com/2012/08/31/video-fake-it-until-you-make-it-with-fakeiteasy/Their exact words were: Free Videos this Week End the Global Pollution Crisis... In Javascript Too many globally scoped variables and functions can make Javascript code difficult to work with, particularly on large projects. See how to simulate the concept of namespaces using objects. Fake it Until You Make It with FakeItEasy FakeItEasy is a .NET framework for easily creating mock objects in tests. See how easy it is to FakeItEasy with complex nested hierarchies.

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• how do you find a file's location?

  - by home-directory

  Noob here. OK, I 1 Open the Dash. 2 Type "file". An app appears, called "files", icon looks like ta 2-drawer file cabinet. I click that, the app opens 3: I click the "Search button". I type the file name in the box and hit Enter. 4: The program thinks for a while, then displays a result. Great! the program found the file I was ilooking for! IT knows where myfile.foo is, BUT I DON'T! IT DOESN'T F%*%#ING SAY WHERE IT IS!!!! How do I find out where it is, please? I hate to say this, but is there an app that works like Windows Explorer (but doesn't crash every 2 minutes)?

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• How to make safe and secure forms in asp.net MVC 3

  - by anirudha

  the asp.net application need all kind of security. unsecure forms may be influence by XSS [cross site scripting] there is some way to solve these type of problem in MVC. first sollution is that use <%= Html.AntiForgeryToken() %> for make secure from cross site scripting. it’s work by machine key in MVC. well you can valid them whenever you got respond from client. you can apply by this attribute on action you give the response behalf of form submission [ValidateAntiForgeryToken] you can secondly use authorize attribute where you can make own definition of authorize attribute in asp.net mvc for more info read david’s post well I am use my own custom attribute who use a different type of authorization :- the who controller use a attribute I put their and the attribute I put their have a logic and logic check the cookie in request who make sure that request they got from user.

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• No startup sound

  - by Laci Bacsi

  Despite numerous attempt, and advise, this is what I applied. sudo cp /usr/share/sounds/ubuntu/stereo/* /usr/share/sounds/ Type this: cd /dev ls -l |less find 14, [0-...] This file for audio you can type cat /etc/passwc >/dev/dsp dsp if speaker device This is not a big deal but I'm an OCD person, so I would like that it works. An other issue is the screensaver, I can not watch movies. I understand that Ubuntu default settings are "Turned off start up sound, and 10 min screensaver auto" If I would be allowed to a suggestions, it is the followings: Is that so problematic to create a check box to check or un check this futures, just to be able to enjoy your product fully? Furthermore I'm reading a lot of similar issues on blogs... Annoying

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• How do I best remove an entity from my game loop when it is dead?

  - by Iain

  Ok so I have a big list of all my entities which I loop through and update. In AS3 I can store this as an Array (dynamic length, untyped), a Vector (typed) or a linked list (not native). At the moment I'm using Array but I plan to change to Vector or linked list if it is faster. Anyway, my question, when an Entity is destroyed, how should I remove it from the list? I could null its position, splice it out or just set a flag on it to say "skip over me, I'm dead." I'm pooling my entities, so an Entity that is dead is quite likely to be alive again at some point. For each type of collection what is my best strategy, and which combination of collection type and removal method will work best?

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• How to use GetActiveUniform (in SharpGL)?

  - by frankie

  Generally, guesting is in header. I cannot understand how to use GetActiveUniform function. public void GetActiveUniform(uint program, uint index, int bufSize, int[] length, int[] size, uint[] type, string name); My attempt looks like this (everything is compiled and linked): var uniformSize = new int[1]; var unifromLength = new int[1]; var uniformType = new uint[1]; var uniformName = ""; Gl.GetActiveUniform(Id, index, uniformNameMaxLength[0], unifromLength, uniformSize, uniformType, uniformName); After call I get proper uniformSize, length and type, but not name.

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• Powershell progress dialogs

  - by Norgean

  Creating nested progress dialogs in Powershell is easy. Let the code speak for itself: for ($i = 1; $i -le 2; $i++) {     Write-Progress -ID 1 -Activity "Outer loop" -Status "Tick $i" -percentComplete ($i / 2*100)     for ($j = 1; $j -le 3; $j++)     {         Write-Progress -ID 2 -Activity "Mid loop" -Status "Tick $j" -percentComplete ($j / 3*100)         for ($k = 1; $k -le 3; $k++)         {             Write-Progress -ID 3 -Activity "Inner loop" -Status "Tick $k" -percentComplete ($k / 3*100)             Sleep(1)         }     } } I.e. some text that explains what we're doing (Activity and Status), and ID numbers. Easy.

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• How to get files that have been added/modifed in a batch file

  - by Chris L

  I have the following batch file which concatenates all of the files in a folder that have a .sql ending. set func=%~dp0%Stored Procedures\*.sql for %%i in (%func%) do type "%%i" >>InstallScript.sql We use SVN as our repository, and we're using branching. Currently the script concatenates all the .sql files, even the ones that haven't changed. I'd like to change it so it only concatenates files that have been modified and/or created after the branch was created. We can do that by looking at the datetime on the .svn folder in each folder(there's a Stored Procedure, View, Function subfolders). But I don't know how to do that with batch files. Ideally something like this(psuedo code): set func=%~dp0%Stored Procedures\*.sql set branchDateTime=GetDateTime(%~dp0%.svn) <- Gets the datetime when the .svn folder was created for %%i in (%func%) { if(%%i.LastModifiedOrCreated > branchDateTime) do type "%%i" >> InstallScript.sql }

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• Selecting Dynamic ID JQuery [migrated]

  - by Vedran Wex Maricevic

  I need to select dynamic id using JQuery, and once I select it then I need to do some action on it. This is the HTML that I have: <input id="content_photos_attributes_1355755712119_image" name="content[photos_attributes][1355755712119][image]" size="30" type="file"> Please note the id value, text is always the same however the number changes (I do not have control over that change). What I need to do is to create on click for that element. This is what I got so far, and it is not working. <script type="text/javascript"> jQuery.noConflict(); jQuery("input[id *= 'content_photos_attributes_']").click(function() { alert("Image deletion is clicked"); }); </script> It really makes no difference whether I select that element by ID or by its name.

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• What is a good design pattern and terminology for decoupling output?

  - by User

  I have a program where I want to save some data record. And I want the output type to be flexible such that I could save the data record to a text file, xml file, database, push to a webservice. My take on it would be to create an interface such as DataStore with a Save() method, and the concrete subclasses such as TextFileDataStore, DatabaseDataStore, etc. What is the proper name/terminology for this type of pattern (I'm using the term "DataStore", log4net names things "appenders", .net they talk about "providers" and "persistence")? I want to come up with good class names (and method names) that fit with a convention if there is one. can you point me to a decent example, preferably in C#, C++, or java? Update Managed to find this stack overflow question, Object persistence terminology: 'repository' vs. 'store' vs. 'context' vs. 'retriever' vs. (…), which captures the terminology part of my question pretty well although there's not a decent answer yet.

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• ubuntu installtion problem

  - by yogi

  I have one machine in which Windows8 is already installed and having 3 partitions(one for windows OS). Now i wanted to install Ubuntu12.04, i have tried many times but ubuntu 12.04 installer not able to fine those partitions, even it is not recognise windows partition. please refer the images and please help me to solve this issue. Somehow i am not able to update images so i am just explain here. "Installation type " window - this window only shows two options 1)Erase disk and install ubuntu" 2) Something else * here there is no option for "Along with windows 8" option and in second window of "Installation type" it shows Device : /dev/sda freespace 500107 MB *there is nothing else. but i reality there is three partitions and i wanted to install Ubuntu in other partitions. I don't formate windows8. I am new with Ubuntu so please help me to install Ubuntu. Thanks.

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• Hidden Windows 7 Wallpaper

  - by BizTalk Visionary

  To find the hidden wallpaper: Type globalization in a search of your C: drive. The only result should be a folder located in the main Windows directory, and you should only be able to see ELS and Sorting folders nested here. Now search for MCT in the top-right search bar. This will display five new unindexed folders, each corresponding to a different global region. Browse these folders for some extra themes and wallpapers specific to Australia, USA, South Africa, and Canada. From here you can select a new wallpaper.

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• How does thumbnail preview in Ubuntu differ from that of Windows? [closed]

  - by Forbidden Overseer

  Possible Duplicate: How does Ubuntu know what file type a file without extension is I thought this question might get a better response in AskUbuntu, as it seems to have more to do with Ubuntu than Windows at a glance. Let's say I have a foo.mkv file. Thumbnail previews work in both Windows 7 and Ubuntu. When I change the filename to anything random like foo.bar or when I remove the extension itself (making it just foo), Nautilus shows thumbnails normally like if it can recognize what type of files they are - without looking at file extension. This however, doesn't happen in Windows 7. Windows starts asking me things like which application I want to use to open that file as soon as I remove file extension (forget thumbnails...) etc. So, How does this thumbnail preview work in Windows 7 and Ubuntu? What makes Ubuntu recognize files "out of the box" unlike Windows 7?

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• Address search from large text file

  - by user73809

  Basically I want to develop a Address lookup(part of my project) using C# (and I can use SQL if necessary). I have a very large text file which have all the UK address and postcodes. Addresses needs to be looked up from this text file. For example, as soon as a user type in the first letter of the postcode it should list all the postcodes starting with that letter and as they type in further, the list should narrow down. Could you guys please how I can do this search very fast and list the results in a efficient way. If you guys know any methods and technologies pls do advice.

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• How does the fstab 'defaults' option work? Is relatime recommended?

  - by hushs

  I know the fstab defaults option means this: rw,suid,dev,exec,auto,nouser,async. But what if I want to add one more option, for example relatime, should I still add defaults too or they are applied anyway? Is it needed to add at least one option? Some examples: 1. UUID=bfb42838-d866-4233-9679-96e7536356df /media/data ext3 defaults 0 2 2. UUID=bfb42838-d866-4233-9679-96e7536356df /media/data ext3 0 2 3. UUID=bfb42838-d866-4233-9679-96e7536356df /media/data ext3 defaults,relatime 0 2 4. UUID=bfb42838-d866-4233-9679-96e7536356df /media/data ext3 relatime 0 2 Is the (2) correct(no option at all)? Are the (1) and (2) the same? Are the (3) and (4) the same? Furthermore, I read in the Ubuntu Community Documentation that in Ubuntu 8.04 relatime was used as default for linux native file systems. Is it still true for 12.04? If yes, then why do I see this if I use the mount command: /dev/sda2 on / type ext4 (rw,errors=remount-ro) If no, why not? It isn't recommended to use relatime now? I just wanted to apply it to my non system partitions, it is a good idea? EDIT: I found an other command to list the mounted partitions and their options: cat /proc/mounts This is the result of a partition mounted with the defaults option in fstab: /dev/sdb2 /media/adat ext3 rw,relatime,errors=continue,barrier=1,data=ordered 0 0 This is the output of mount for the same partition: /dev/sdb2 on /media/adat type ext3 (rw) And here is both result if the same partition mounted from Nautilus as a non-root user: /dev/sdb2 /media/adat ext3 rw,nosuid,nodev,relatime,errors=continue,barrier=1,data=ordered 0 0 /dev/sdb2 on /media/adat type ext3 (rw,nosuid,nodev,uhelper=udisks) So it looks like relatime is used if we mount an ext partition in 12.04. So it is unneeded to add it manually. So my problem is broadly solved. But I still can't see why the options that should be in the defaults are not listed even with the cat /proc/mounts. Maybe there is a third and even better method to list the partition mount options :)

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• Est-ce une erreur de placer les firewalls en amont des serveurs ? Une étude démontre que cela favorise les attaques DDoS

  Les attaques DDoS de plus en plus nombreuses et favorisées par de mauvais déploiements des firewalls, injustement placés en amont des serveurs Arbor Networks s'est penché sur l'étude des attaques par déni-de-service, en interrogeant 111 fournisseurs d'accès dans le monde (autant pour des services fixes que mobiles), du fait de la recrudescence de ce type d'attaques en 2010. En effet, 25% du panel déclare y avoir été confronté plus de dix fois par mois, alors que 69% des répondants assure rencontrer ce type d'attaque au moins une fois sur la même période. Elles sont de également plus importantes et virulentes, atteignant pour la première fois les 100Gbps (c'est deux fois plus qu'en 2009, et dix fois plus qu'en 2005). Leur taille dev...

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• cant boot ubuntu after install (first time)

  - by user1683645

  Trying to install ubuntu for the first time. I use an usb stick. At partition I use one of the hdd's I have and create a partition of 50gb for ubuntu @ /dev/sda and the partitions name is dev/sda1 with type ext4. All is well and the installation is completed without any errors and I get a dialogue asking me to restart but ubuntu does not boot. I only have one device as boot in my bios and I think its the devide with ubuntu on it since I've not partitioned the other discs. When I create the partition I yse primary type and localtion for the new partition is att the beginning of the space. And I use Ext4 file system. Mount point is / What am I doing wrong?

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