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  • Which LINQ query is more effective?

    - by Danny Chen
    I have a huge IEnumerable(suppose the name is myItems), which way is more effective? Solution 1: Filter it first then ForEach. Array.ForEach(myItems.Where(FILTER-IT-HERE).ToArray(),MY-ACTION); Solution 2: Do RETURN in MY-ACTION if the item is not up to the mustard. Array.ForEach(myItems.ToArray(),MY-ACTION-WITH-FILTER); Is one of them always better than another? Or any other good suggestions? Thanks in advance.

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  • Unit Testing (xUnit) an ASP.NET Mvc Controller with a custom input model?

    - by Danny Douglass
    I'm having a hard time finding information on what I expect to be a pretty straightforward scenario. I'm trying to unit test an Action on my ASP.NET Mvc 2 Controller that utilizes a custom input model w/ DataAnnotions. My testing framework is xUnit, as mentioned in the title. Here is my custom Input Model: public class EnterPasswordInputModel { [Required(ErrorMessage = "")] public string Username { get; set; } [Required(ErrorMessage = "Password is a required field.")] public string Password { get; set; } } And here is my Controller (took out some logic to simplify for this ex.): [HttpPost] public ActionResult EnterPassword(EnterPasswordInputModel enterPasswordInput) { if (!ModelState.IsValid) return View(); // do some logic to validate input // if valid - next View on successful validation return View("NextViewName"); // else - add and display error on current view return View(); } And here is my xUnit Fact (also simplified): [Fact] public void EnterPassword_WithValidInput_ReturnsNextView() { // Arrange var controller = CreateLoginController(userService.Object); // Act var result = controller.EnterPassword( new EnterPasswordInputModel { Username = username, Password = password }) as ViewResult; // Assert Assert.Equal("NextViewName", result.ViewName); } When I run my test I get the following error on my test fact when trying to retrieve the controller result (Act section): System.NullReferenceException: Object reference not set to an instance of an object. Thanks in advance for any help you can offer!

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  • What is natural deduction used for outside of academia?

    - by Danny King
    Hello, I am studying natural deduction as a part of my Formal Specification & Verification Computer Science course at University/College. I find it interesting, however I learn much better when I can find a practical use for things. Could anyone explain to me if and how natural deduction is used other than for formally verifying bits of code? Thanks!

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  • How do I hook a git pull on the remote?

    - by Danny
    Is there a way to hook when a git pull happens on the remote (similar to a pre-receive or post-receive). Basically I'd like to be able to cause the remote to commit whatever it has when there is a pull. In my situation, whatever is live on the remote is an authoritative source which may get modified without a git commit. I want to make sure when I pull I'm always able to get the latest of whatever is live.

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  • Streaming Media Player Tutorial Stops Unexpectedly. How Should I Debug (And Other Questions From A

    - by Danny
    Hello! I'm a fledgling in the Android and Eclipse ways. I was reading and downloaded the source code for a Streaming Media Player tutorial from Pocket Journey, here. However, when I try to run it through the "Run As..." or "Debug As..." features in Eclipse, the emulator reports: "Sorry! The application Android Tutorials (process com.pocketjourney.tutorials) has stopped unexpectedly. Please try again." Now, from stepping through the Tutorial 1 activity (for those of you that may be familiar with it), it seems something funky happens here: button.setOnClickListener(new View.OnClickListener() { public void onClick(View view) { Toast.makeText(Tutorial1.this, "Button Clicked",Toast.LENGTH_SHORT).show(); }}); My questions are: What's up with that line? Apparently, other comments haven't had this problem; am I missing some library that I should be downloading from someplace? How should I go about debugging this other than/in addition to stepping through code? I'm used to Visual Studio, which has a nice box with exception details for me to sift through and copy/paste to google with. Eclipse debugging showed a "No Source Code" page, or a list of exceptions. I've heard of something called LogCat; is that relevant here? Thanks in advance!

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  • How to Look Up Email by Full Name in Active Directory?

    - by Danny
    I want to search for a user's email by using Active Directory. Available is the user's full name (ex. "John Doe" for the email with an email "[email protected]"). From what I've searched, this comes close to what I'm looking to do -- except that the Filter is set to "SAMAccountName", which is not what I have. Unless I'm misunderstanding, I just need to pick the right attribute and toss in the full name name in the same way. Unfortunately, I don't know what this attribute is, apparently no one has had to ask about searching for information in this manner, and that is a pretty big list (msdn * microsoft * com/en-us/library/ms675090(v=VS.85) * aspx, stackoverflow didn't let me link 2 hyperlinks because I don't have 10 rep) of attributes. Does anyone know how to obtain the user's email address through an Active Directory lookup by using the user's full name?

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  • ASP.NET Threading issue

    - by Danny
    Hope I can explain this correctly. I have a process, that outputs step by step messages (i.e., Processing item 1... Error in item 2 etc etc). I want this to be outputted to the user during the process, and not at the end. I pretty sure i need to do this with threading, but can't find a decent example. Thanks in advanced.

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  • Emacs & PHP indenting question

    - by Danny
    Hi all, I'm a bit new to using emacs for webdevelopment. I am using php-mode and i am happy with it. There is only one issue i have which causes me a lot of problems because of our company's coding style. When i have a function, e.g.: $instance = new Model('foo', 'bar'); And I want to indent it like this: $instance = new Model( 'foo', 'bar' ); Emacs does the following when i insert a newline before the first argument and indents it like this: $instance = new Model( 'foo', 'bar' ); Can anyone point me in a direction on how i can configure/change this? Thanks in advance

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  • Java array assignment (multiple values)

    - by Danny King
    Hello, I have a Java array defined already e.g. float[] values = new float[3]; I would like to do something like this further on in the code: values = {0.1f, 0.2f, 0.3f}; But that gives me a compile error. Is there a nicer way to define multiple values at once, rather than doing this?: values[0] = 0.1f; values[1] = 0.2f; values[2] = 0.3f; Thanks!

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  • Volatile fields in C#

    - by Danny Chen
    From the specification 10.5.3 Volatile fields: The type of a volatile field must be one of the following: A reference-type. The type byte, sbyte, short, ushort, int, uint, char, float, bool, System.IntPtr, or System.UIntPtr. An enum-type having an enum base type of byte, sbyte, short, ushort, int, or uint. First I want to confirm my understanding is correct: I guess the above types can be volatile because they are stored as a 4-bytes unit in memory(for reference types because of its address), which guarantees the read/write operation is atomic. A double/long/etc type can't be volatile because they are not atomic reading/writing since they are more than 4 bytes in memory. Is my understanding correct? And the second, if the first guess is correct, why a user defined struct with only one int field in it(or something similar, 4 bytes is ok) can't be volatile? Theoretically it's atomic right? Or it's not allowed simply because that all user defined structs(which is possibly more than 4 bytes) are not allowed to volatile by design?

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  • JSF 2.1 Spring 3.0 Integration

    - by danny.lesnik
    I'm trying to make very simple Spring 3 + JSF2.1 integration according to examples I googled in the web. So here is my code: My HTML submitted to actionController.actionSubmitted() method: <h:form> <h:message for="textPanel" style="color:red;" /> <h:panelGrid columns="3" rows="5" id="textPanel"> //all my bean prperties mapped to HTML code. </h:panelGrid> <h:commandButton value="Submit" action="#{actionController.actionSubmitted}" /> </h:form> now the Action Controller itself: @ManagedBean(name="actionController") @SessionScoped public class ActionController implements Serializable{ @ManagedProperty(value="#{user}") User user; @ManagedProperty(value="#{mailService}") MailService mailService; public void setMailService(MailService mailService) { this.mailService = mailService; } public void setUser(User user) { this.user = user; } private static final long serialVersionUID = 1L; public ActionController() {} public String actionSubmitted(){ System.out.println(user.getEmail()); mailService.sendUserMail(user); return "success"; } } Now my bean Spring: public interface MailService { void sendUserMail(User user); } public class MailServiceImpl implements MailService{ @Override public void sendUserMail(User user) { System.out.println("Mail to "+user.getEmail()+" sent." ); } } This is my web.xml <listener> <listener-class> org.springframework.web.context.ContextLoaderListener </listener-class> </listener> <listener> <listener-class> org.springframework.web.context.request.RequestContextListener </listener-class> </listener> <!-- Welcome page --> <welcome-file-list> <welcome-file>index.xhtml</welcome-file> </welcome-file-list> <!-- JSF mapping --> <servlet> <servlet-name>Faces Servlet</servlet-name> <servlet-class>javax.faces.webapp.FacesServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> my applicationContext.xml <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"> <bean id="mailService" class="com.vanilla.jsf.services.MailServiceImpl"> </bean> </beans> my faces-config.xml is the following: <application> <el-resolver> org.springframework.web.jsf.el.SpringBeanFacesELResolver </el-resolver> <message-bundle> com.vanilla.jsf.validators.MyMessages </message-bundle> </application> <managed-bean> <managed-bean-name>actionController</managed-bean-name> <managed-bean-class>com.vanilla.jsf.controllers.ActionController</managed-bean-class> <managed-bean-scope>session</managed-bean-scope> <managed-property> <property-name>mailService</property-name> <value>#{mailService}</value> </managed-property> </managed-bean> <navigation-rule> <from-view-id>index.xhtml</from-view-id> <navigation-case> <from-action>#{actionController.actionSubmitted}</from-action> <from-outcome>success</from-outcome> <to-view-id>submitted.xhtml</to-view-id> <redirect /> </navigation-case> </navigation-rule> My Problem is that I'm getting NullPointerExeption because my mailService Spring bean is null. public String actionSubmitted(){ System.out.println(user.getEmail()); //mailService is null Getting NullPointerException mailService.sendUserMail(user); return "success"; }

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  • This is a programmer question, I have a Youtube.apk , I hope to play youtube videos with it's apk..

    - by danny
    hi all: This is a programmer question, I have a Youtube.apk , I hope to play youtube videos with it's apk, but make a problem when I had been play youtube videos , this's problem is : ============================================================================================= I/AndroidRuntime( 373): AndroidRuntime onExit calling exit(-42) I/ActivityManager( 52): Process com.google.android.youtube (pid 373) has died. D/Zygote ( 33): Process 373 exited cleanly (214) I/UsageStats( 52): Unexpected resume of com.android.launcher while already resumed in com.google.android.youtube ============================================================================================== I don't know why to call onExit method??? can anyone answer me !! How to fix this problem? Thanks ~~~

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  • Ant 1.8 include or import with nested resource collection

    - by Danny
    I'd like to have Ant automatically include or import resources matching a particular pattern, but I'm really struggling with the syntax. Here's what I've tried: <import> <fileset dir="${basedir}" includes="*-graph.xml" /> </import> However, I just get the error message import requires file attribute or at least one nested resource The documentation for import (and include) both say that you can use a nested resource collection, and the documentation for resource collections says <fileset> is a resource collection. I've Googled and can't find any useful examples at all. I'm using Ant 1.8.1 (verified with ant -version)

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  • Losing URI segments when paginating with CodeIgniter

    - by Danny Herran
    I have a /payments interface where the user should be able to filter via price range, bank, and other stuff. Those filters are standard select boxes. When I submit the filter form, all the post data goes to another method called payments/search. That method performs the validation, saves the post values into a session flashdata and redirects the user back to /payments passing the flashdata name via URL. So my standard pagination links with no filters are exactly like this: payments/index/20/ payments/index/40/ payments/index/60/ And if you submit the filter form, the returning URL is: payments/index/0/b48c7cbd5489129a337b0a24f830fd93 This works just great. If I change the zero for something else, it paginates just fine. The only issue however is that the << 1 2 3 4 page links wont keep the hash after the pagination offset. CodeIgniter is generating the page links ignoring that additional uri segment. My uri_segment config is already set to 3: $config['uri_segment'] = 3; I cannot set the page offset to 4 because that hash may or may not exists. Any ideas of how can I solve this? Is it mandatory for CI to have the offset as the last segment in the uri? Maybe I am trying an incorrect approach, so I am all ears. Thank you folks.

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  • UI suggestions on how to display suggested tags for a given text to a user?

    - by Danny
    I am writing a web-app that uses a tagging system to organize the user's submitted reports. Part of it uses ajax to get suggestions for tags to present to the user based on the content of their report. I am looking for suggestions on how to present this information for the user. I'm not quite certain what a friendly way to do this would be. Edit: Well, most of the responses here seem to be focused on the user typing in keywords. The idea I'm trying to define here is more towards presenting the user a set of suggested keywords that they may accept or decline without having to type a tag in manually. (That option is of course still available to them) --------------------------- # say they can checkoff or select tags they like. | o[tag2] x[foo] o[moo] | | x[tag1] o[bar] | ---------------------------

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  • What tech stack/platform to use for a project?

    - by danny z
    Hey guys, This is a bit of a weird meta-programming question, but I've realized that my new project doesn't need a full MVC framework, and being a rails guy, I'm not sure what to use now. To give you a gist of the necessary functionality; this website will display static pages, but users will be able to log in and 'edit their current plans'. All purchasing and credit card editing is being handled by a recurring payment subscriber, I just need a page to edit their current plan. All of that will be done through (dynamic) XML API calls, so no database is necessary. Should I stick with my typical rails/nginx stack, or is there something I could use that would lighten the load, since I don't need the Rails heft. I'm familiar with python and PHP but would prefer not to go that route. Is Sinatra a good choice here? tl;dr: What's a good way to quickly serve mostly static pages, preferably in Ruby, with some pages requiring dynamic XML rendering?

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  • Link objects as fields in UML diagram

    - by fearofawhackplanet
    I'm trying to generate a diagram for a design document. I've generated a class diagram in VS. At the moment it's just a bunch of unconnected boxes as there isn't any inheritance going on. It feels like it would be more useful if I could show how the objects interact through properties and parameters. As an example, a Boy class has a method Kiss which takes a Girl object. How can I show that Boy and Girl interact by connecting this in the diagram? Is there a notation for this in UML? Or is there another type of diagram that shows this? Can I make VS draw this connection for me somehow? Or is this a silly/useless idea? It just doesn't feel like a proper diagram unless it's got some lines on it somewhere :)

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  • Can't create new "enterprise" project in netbeans

    - by Danny
    I'm running netbeans 6.7.1 on Ubuntu Karmic. On the services tab I added a new glassfish v3 prelude server, I installed it to my home directory using the download button. I started the server and opened localhost:4848 to verify I can get into the admin panel. Then I did file-new projct and created a new java web-web application. On the configuration step of the wizard it preselected glassfish v3 prelude and java ee 5. I accepted and did a test run. I ran the project just fine. So now I did file-new projecct and attempted to create a Java EE-ejb module. When I arrive to the server configuration stage of the wizard, it doesn't show any servers on the server dropdown list (so it's empty), it also doesn't see any version of java on the "java ee version" dropdown list. This also happens for the other "Java EE" project types. I can't seem to get my head around why I can make a new web application but not an ejb module. Can anyone provide any insight to why it might not be seeing that I have java or glassfish installed when I try to make a new java ee project but I see it when I try to make a java web project?

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  • Save jQuery callback functions in a separate file

    - by Danny Herran
    Probably I missed something, but lets say I have this: $('a.delete').click(function(){ resp=window.confirm("Are you sure you want to delete this?"); if(resp) return true; else return false; } Now, I want to save that callback function into a separate js file, because I will use it in several pages. My logic told me to do this: $('a.del').click(delete_element()); Having my js file like this: function delete_element(){ resp=window.confirm("Are you sure you want to delete this?"); if(resp) return true; else return false; } This doesn't work. Everytime my page loads, it displays the confirm window, even if I haven't clicked the link. It is clear that my logic failed this time. What am I missing?

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  • Is my natural deduction proof correct?

    - by Danny King
    Hello, Given the sequent: |- p v ¬p (that is, no left-hand-side, derives p or not p) I have taken this from http://www.danielclemente.com/logica/dn.en-node38.html but I got a different proof to his solution. I think my simpler proof is correct but could someone verify it for me to check I have understood it? I'd appreciate it very much! 1. ¬(p v ¬p) assumption {note this is equivalent to ¬p ^ p} 2. ¬p ^elimination 1 3. p ^elimination 1 4. contradiction ¬elimination 3, 2 5. p v ¬p ¬introduction 1-4 Thanks!

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  • Passing a 'var' into another method

    - by Danny
    Hi, I am probably totally missing the point here but.... How can I pass a 'var' into another method? (I am using linq to load XML into an Enumerable list of objects). I have differernt object types (with different fields), but the final step of my process is the same regardless of which object is being used. XNamespace xmlns = ScehmaName; var result = from e in XElement.Load(XMLDocumentLocation).Elements(xmlns + ElementName) select new Object1 { Field1 = (string)e.Element(xmlns + "field1"), Field2 = (string)e.Element(xmlns + "field2") }; var result2 = Enumerable.Distinct(result); This code will vary for the different type of XML files that will be processed. But I then want to iterate though the code to check for various issues: foreach (var w in result2) { if (w.CheckIT()) { //do something } } What I would love is the final step to be in a method in the base class, and I can pass the 'var' varible into it from each child class.

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  • return a php associative array to javascript array

    - by Eric Sim
    I am trying to return a php associative array to javascript array through ajaxRequest.responseText Here's what I do. First in php, I do this: $encoded = json_encode($thisarray); echo $encoded; If I echo $encoded, I get {"a":"apple,arrow","b":"boy,bank","c":"cat,camp"} Then in js script, thisarray = new Array(); thisarray = ajaxRequest.responseText; If I alert thisarray, I get {"a":"apple,arrow","b":"boy,bank","c":"cat,camp"} That's wrong since alerting an array should give error. But in this case, when I alert thisarray, I get the full array!! Needless to say, I can't call my value out of thisarray, since it is yet defined as an array. Anyone can tell me what am I missing here?

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