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  • WPF/MVVM - should we create a different Class for each ViewModel ?

    - by FMFF
    I'm attempting the example from the excellent "How Do I" video for MVVM by Todd Miranda found in MSDN. I'm trying to adapt the example for my learning purpose. In the example, he has a ViewModel called EmployeeListViewModel. Now if I want to include Departments, should I create another ViewModel such as DepartmentListViewModel? The example has EmployeeRepository as the Data Source. In my case, I'm trying to use an Entity object as the datasource (Employees.edmx in Model folder and EmployeeRepository.cs in DataAccess folder). If I want to display the list of Departments, should I create a separate class called DepartmentRepository and put all department related method definitions there? What if I want to retrieve the employee name and their department's name together? Where should I place the methods for this? I'm very new to WPF and MVVM and please let me know if any of the above needs to be re-phrased. Thank you for all the help.

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  • Howto troubleshoot vb6 dll 800a01ad error in c# application

    - by phq
    I have a dll that I created from a VB6 project that I am now using in a c# project. This has worked before but now when I try to return to the c# project to fix a bug, the program get a COMException stating roughly translated: Could not create an instance of COM-component with CLSID {085E3494-9F78-47D5-B0E6-FA460FD3CBED} from IClassFactory because of the following error: 800a01ad. So I try to create a new empty c# project with only one line in the main function: OurNamespace.OurClass foo = new OurNamespace.OurClass(); Which fails with the same error. I have registered the dll but that did not change the outcome of the problem. The problem only occurs on the machine I am currently at, still I'm interested to understand the problem so that I know how to fix it if it occurs on a customers computer.

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  • Silverlight Navigation - how to override Back button behavior

    - by Stephen Ellis
    I'm trying to override the default behavior of the browser's back button in Silverlight (v4). Each of my XAML pages has an ability to show options. I want these options to be hidden when the user presses the back button, or to move to the previous page if the options are not visible. The Silverlight Frame seems to set back and forward points whenever the user navigates to a page with a new QueryString. Is there any other way of implementing my scenario other than having to implement a querystring component for my ShowOptions property?

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  • Is there a production ready web application framework in Python?

    - by peperg
    I heard lots of good opinions about Python language. They say it's mature, expressive etc... Are there any production-ready web application frameworks in Python. By "production ready" I mean : supports objective-relational mapping with caching and declarative desciption (like JPA, Hibernate etc..) controls oriented user interface support - no HTML templates but something like JSF (RichFaces, Icefaces) or GWT, Vaadin, ZK component decomposition and dependency injection (like EJB or Spring) unit and integration testing good IDE support clustering, modularity etc (like Terracota, OSGi etc..) there are successful applications written in it by companies like IBM, Oracle etc (I mean real business applications not Twitter) could have commercial support Is it possible at all in Python world ? Or only choices are : use Python and write everything from the bottom (too expensice) stick to JEE buy .NET stack

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  • Windows.Forms.Timer instance and UI threads

    - by David Rutten
    I have a custom control whose primary purpose is to draw data. I want to add a ScheduleUpdate(int milliSeconds) method to the control which will force an update X milliseconds from now. Since this is all GUI land, I should be using a Windows.Forms.Timer, but how does this timer instance know which thread it belongs to? What if ScheduleUpdate() is called from a non-UI thread? Should I construct the timer in the Control constructor? Or perhaps the Load event? Or is it safe to postpone construction until I'm inside ScheduleUpdate()? I know there are some very similar questions about this already, but I don't have a Timer component on my control, I'm constructing it on a when-it's-needed basis.

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  • How do you read system jobs in Dynamics CRM?

    - by Dan Crowther
    The CRM SDK says this is possible but the following code fails. Does anyone know why? var request = new RetrieveMultipleRequest(); var query = new QueryExpression(EntityName.asyncoperation.ToString()); query.ColumnSet = new AllColumns(); request.Query = query; var response = _connection.Execute(request); The error is: <error>\n <code>0x80040216</code> <description>An unexpected error occurred.</description> <type>Platform</type> </error> If I change the entity name to account, it works fine.

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  • Is an IQueryable a query or just an object which can be queried?

    - by Albic
    I'm kinda confused what the IQueryable interface actually represents. The MSDN documentation for IQueryable says: "Provides functionality to evaluate queries against a specific data source." The documentation for IQueryProvider says: "Defines methods to create and execute queries that are described by an IQueryable object." The name and the documentation summary suggest that it is an object/data store which can be queried. The second quote and the fact the ObjectQuery class from the Entity Framework implements IQueryable suggest it is a query which can be executed. Did I misunderstood something or is it really kinda fuzzy?

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  • XML strings in JAXB

    - by OOO
    I have a JPA entity class mimicking a table. Something like this: @XmlType(name="MyClassElementType") public class MyClass { String name; String xmlDesc; public MyClass() {} @XmlElement String getName() { return name; } void setName(String name) { this.name = name; } @XmlElement String getXmlDesc() { return xmlDesc; } void setXmlDesc(String xmlDesc) { this.xmlDesc = xmlDesc; } } In a Jersey REST get call I'm trying to return this class: @Get @Produces("application/xml") public MyClass get() { return myClass; } Now I'm expecting the already xml string(xmlStr) to be returned as is, but Jersey/JAXB escapes it... So anyway around this?

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  • Producer Consumer Issue with Core Data

    - by Mugunth Kumar
    I've a Core Data application. In the producer thread, I pull data from a web service and store it in my object and call save. My consumer object is a table view controller that displays the same. However, the app crashes and I get NSFetchedResultsController Error: expected to find object (entity: FeedEntry; id: 0xf46f40 ; data: ) in section (null) for deletion on the console. When I debug it, everything works fine. So I understood that it's like a race issue. How is these kind of problem solved? What's the best way to design a producer-consumer app with core-data?

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  • SIFR Newbie: font display problem in non-flash browsers

    - by bullquartz
    Hi, I'm wondering if someone can help me with this as I'm fairly new to siFR and think there is something essential i'm not comprehending in the documentation. I'm having success using siFR 3 (r436) to render fonts and it's working just how I want. However if I turn flash off in any browser the original (no longer rendered) html text displays very badly indeed. I thought that in any non-flash browser my inital stylesheet would be referred to and not siFR.css and I would be able to adjust the html text as a seperate entity. I think i probably developed this bad idea because I remember in earlier siFR versions you had to mess around alot with stylings on the original stylesheet + the sifr-config so you would get corresponding line heights/widths etc between the html and rendered font. (i realise that siFR 3 renders the flash in a different way) So it seems that siFR.css controls both the non-flash text and the rendered font. Anyway my essential noob questions is: how do i get the the original html text to have the same dimensions as the rendered font? thanks for you help

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  • MySQL - Finding time overlaps

    - by Jude
    Hi, I have 2 tables in the database with the following attributes: Booking ======= booking_id booking_start booking_end resource_booked =============== booking_id resource_id The second table is an associative entity between "Booking" and "Resource" (i.e., 1 booking can contain many resources). Attributes booking_start and booking_end are timestamps with date and time in it. May I know how I might be able to find out for each resource_id (resource_booked) if the date/time overlaps or clashes with other bookings of similar resource_id? I was doodling the answer on paper, pictorially, to see if it might help me visualize how I could solve this and I got this: Joining the 2 tables (Booking, Booked_resource) into one table with the 4 attributes needed. Follow the answer suggested here : http://stackoverflow.com/questions/689458/find-overlapping-date-time-rows-within-one-table I did step 1 but step 2 is leaving me baffled! I would really appreciate any help on this! Thanks!

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  • How to ignore CDATA tags?

    - by Petre
    I'm trying to make an html parser, but when I load the html I get warnings like this Warning: DOMDocument::loadHTML() [domdocument.loadhtml]: Invalid char in CDATA 0x1C in Entity, line: 1302 Here is the code I use class Parser { public $url=null; public $html=null; public $tidy=null; public $head=null; public $head_xpath=null; function __construct($url){ $this->url=$url; $this->html=file_get_contents($this->url); $this->tidy=tidy_parse_string($this->html); $this->head=new DOMDocument(); $this->head->loadHTML($this->tidy->head()); $this->head_xpath= new DOMXPath($this->head); } } $x=new Parser("http://www.guardian.co.uk/politics/2012/mar/24/vince-cable-coalition-banking-row"); I searched around and found the LIBXML_NOCDATA constant, but I don't know how to set it. So how could i completely ignore CDATA?

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  • Why is the EntityManager in my GAE + Spring (+graniteds) project reset to null?

    - by prefabSOFT
    Hi all, I'm having a problem with autowiring my EntityManager. Actually at server startup I can see that the injection works ok, though when trying to use my EntityManager it appears to be null again. @Component public class DataDaoImpl { protected EntityManager entityManager; @Autowired public void setEntityManager(EntityManager entityManager) { System.out.println("Injecting "+entityManager); //works! this.entityManager = entityManager; } public void createData(String key, String value) { System.out.println("In createData entityManager is "+entityManager); //entityManager null!? ... Output: Injecting org.datanucleus.store.appengine.jpa.DatastoreEntityManager@a60d19 The server is running at http://localhost:8888/ In createData entityManager is null So somehow the autowired entityManager is reset to null when trying to use it. It's a graniteds powered project though I don't think this is graniteds related. Any ideas? Thanks a lot in advance, Jochen

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  • SpringSource Roo Controller Removal

    - by Steve Wall
    Hello, Environment: Windows XP, SpringSource Tool Suite 2.3.2, Roo 1.0.2.Release, Java 1.6.0_10, tc Server 6.0 I'm using the canned Roo generated code. I created an entity and associated controller. Then deleted both classes. The problem I'm seeing is the Roo created home page still shows the "Create/List" section for the deleted classes. I'm executing this within the tc Server, within Eclipse. Any ideas on how to get Roo to update the home page? Thanks, Steve

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  • safely encode and pass a string from a html link to PHP program

    - by bert
    What series of steps would be reqired to safely encode and pass a string from a html href using javascript to construct the link to a php program. in javascript set up URL // encodes a URI component. path = "mypgm.php?from=" + encodeURIComponent(myvar) ; in php: // get passed variables $myvar = isset($_GET['myvar']) ? ($_GET['myvar']) : ''; // decode - (make the string readable) $myvar = (rawurldecode($myvar)); // converts characters to HTML entities (reduce risk of attack) $myvar = htmlentities($myvar); // maybe custom sanitize program as well? // see [http://stackoverflow.com/questions/2668854/php-sanitizing-strings-to-make-them-url-and-filename-safe][1] $myvar = sanitize($myvar);

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  • How can Perl interact with an ajax form

    - by Jeff
    I'm writing a perl program that was doing a simple get command to retrieve results and process them. But the site has been updated and now has a java component that handles the results (so the actual data is not in the source code anymore). This is the site: http://wro.westchesterclerk.com/legalsearch.aspx Try putting in: Index Number: 11103 Year: 2009 I want to be able to pro grammatically enter the "index number" and "year" at the bottom of the form where it says "search by number" and then retrieve the results listed next to it. I've written many programs in Perl that simply pass variables via the URL and the results are listed in the source code, so it's easy to parse. (Using LWP:Simple) Like: $html = get("http://www.url.com?id=$somenum&year=$someyear") But this is totally new to me and I don't know where to begin. I'm somewhat familiar with LWP:UserAgent and Mechanize. I'd really appreciate any help. Thanks!

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  • Has anyone ever encountered a Monad Transformer in the wild?

    - by martingw
    In my area of business - back office IT for a financial institution - it is very common for a software component to carry a global configuration around, to log it's progress, to have some kind of error handling / computation short circuit... Things that can be modelled nicely by Reader-, Writer-, Maybe-monads and the like in Haskell and composed together with monad transformers. But there seem to some drawbacks: The concept behind monad transformers is quite tricky and hard to understand, monad transformers lead to very complex type signatures, and they inflict some performance penalty. So I'm wondering: Are monad transformers best practice when dealing with those common tasks mentioned above?

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  • castle scheduler - cluster

    - by cvista
    Hi We're using the castle scheduler component: http://using.castleproject.org/display/Comp/Castle.Components.Scheduler?showChildren=false I have a wcf service which creates the tasks and that does it's job fine. I then have a console app running (will be a windows service eventually) which should then keep an eye out for tasks to run. Thing is the each create their own scheduler in the DB but they both have the same clusterid. Should the console app be able to run the tasks created by the wcf service? If not - how can i make it do that? Cheers w://

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  • Implement Exception Handling in ASP.NET C# Project

    - by Shrewd Demon
    hi, I have an application that has many tiers. as in, i have... Presentation Layer (PL) - contains all the html My Codes Layer (CL) - has all my code Entity Layer (EL) - has all the container entities Business Logic Layer (BLL) - has the necessary business logic Data Logic Layer (DLL) - any logic against data Data Access Layer (DAL) - one that accesses data from the database Now i want to provide error handling in my DLL since it is responsible for executing statement like ExecureScalar and all.... And i am confused as to how to go about it...i mean do i catch the error in the DLL and throw it back to the BLL and from there throw it back to my code or what.... can any one please help me how do i implement a clean and easy error handling techinque help you be really appreciated. Thank you.

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  • If you are forced to use an Anemic domain model, where do you put your business logic and calculated

    - by Jess
    Our current O/RM tool does not really allow for rich domain models, so we are forced to utilize anemic (DTO) entities everywhere. This has worked fine, but I continue to struggle with where to put basic object-based business logic and calculated fields. Current layers: Presentation Service Repository Data/Entity Our repository layer has most of the basic fetch/validate/save logic, although the service layer does a lot of the more complex validation & saving (since save operations also do logging, checking of permissions, etc). The problem is where to put code like this: Decimal CalculateTotal(LineItemEntity li) { return li.Quantity * li.Price; } or Decimal CalculateOrderTotal(OrderEntity order) { Decimal orderTotal = 0; foreach (LineItemEntity li in order.LineItems) { orderTotal += CalculateTotal(li); } return orderTotal; } Any thoughts?

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  • Difference between halo and mx namespace

    - by Andree
    Hi there ! As far as I know, the support for library://ns.adobe.com/flex/halo namespace has been dropped, and now we have to use library://ns.adobe.com/flex/mx instead (reference). Can someone provide if there's any difference between the two namespaces? I am just starting to learn Flex and this change make me confused. For example, if I have an <mx:Tree> tag in my mxml document, the compiler complains that <mx:Tree> could not be resolved to a component implementation. But if I change my mx namespace to use the old one instead (halo), it successfully compiled without error. Thanks. Andree Updated: By the way, I use Flex SDK command line compiler in Windows. mxmlc --version Version 4.0.0 build 10485

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  • problem in basic implementation of MVVM pattern - Services

    - by netmajor
    I watch some video and read articles about MVVM pattern and start thinking how should I implement it in my Silverlight app. So at first I create Silverlight application. I think that for clear view I create 3 folders: View - for each user control page in my app, ViewModel - for c# class which will querying date and Model- Entity Data Model of my SQL Server or Oracle Database. And now I am confused, cause I want to implement *WCF/RIA Services/Web services* in my project. In which folder should I put in class of services? I see in examples that Services take date and filtering it and then output data was binding in View - so It looks as ViewModel. But I was sure that someone use Services in Model and that I want to do. But how? Can someone explain me implementing Services as Model? Is my point of view at MVVM is correctly?

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  • Flex: Result event given multiple times

    - by Tom
    Hello everybody!! I am trying to learn Flex and now i have the next code: http://pastebin.com/rZwxF7w1 This code is for my login component. I want to get a special string for encrypting my password. This string is given by my authservice. But when i login i get a multiple times a alert with Done(line 69 in the pastebin code or line 4 in the code on the bottom of this question). But i want that it shows one single time. Does someone know what is wrong with this code? Tom protected function tryLogin():void { encryptStringResult.addEventListener('result', function(event:ResultEvent):void { var encryptString:String = event.result.toString(); Alert.show('Done'); }); encryptStringResult.token = auth.getEncryptString(); }

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  • How to override the behavior of Spring @Autowired

    - by Mark
    Hi a little background: I am Using Spring 2.5, and specifically spring IOC and annotations. I am using @Autowired in my code (the Autowiring is done by type) and use @Component for exposing Classes to the Automatic wiring. The situation described bellow arose while i tried to test my code. now to the problem: Note: i use a different Spring Context for the Test environment. I have a class FOO which is @Autowired but in the test context i want to use a different class of the same type MockFoo (extends FOO) The Spring Setup of course fails do so automatically due to multiple options for the Dependency Injection of the FOO class (both FOO and MockFOO comply to the Type check) I am looking for a way to inject the test bean instead of the original bean. I expected Spring to allow using the Context configurion file to override a bean injection or to order Spring not to autowire a specific bean BUT All these option seem to exists only for the beans which were originally defined in the Spring Context Configuration file

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  • jPlayer problem in Firefox - also throws error from jQuery?! Not related to OGG support.

    - by wolftron
    I've been working on a small SVG website, http://docroot.ca/ - the SVG part has been working out pretty well. In the current site, jPlayer is called and given an mp3. jPlayer functions properly in Safari, Chrome, and Opera, but not Firefox which throws the following two errors: Error: not well-formed Source File: Line: 1, Column: 191 Source Code: <div xmlns="http://www.w3.org/1999/xhtml"><embed name="jqjp_flash_0" id="jqjp_flash_0" src="js/Jplayer.swf" width="0" height="0" bgcolor="#ffffff" quality="high" FlashVars="id=jPlayerBox&fid=jqjp_flash_0&vol=80" allowScriptAccess="always" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" /></ and: Error: uncaught exception: [Exception... "An invalid or illegal string was specified" code: "12" nsresult: "0x8053000c (NS_ERROR_DOM_SYNTAX_ERR)" location: "https://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js Line: 122"] I'm not sure why the latter happens at all. The former might have something to do with jPlayer's .swf component. The weird thing is the same code works in http://willshown.com/dw, but not in http://docroot.ca. Any guesses as to what direction to take this problem?

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