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• Entity Framework 4 mapping fragment error when adding new entity scalar

  - by Jason Morse

  I have an Entity Framework 4 model-first design. I create a first draft of my model in the designer and all was well. I compiled, generated database, etc. Later on I tried to add a string scalar (Nullable = true) to one of my existing entities and I keep getting this type of error when I compile: Error 3004: Problem in mapping fragments starting at line 569: No mapping specified for properties MyEntity.MyValue in Set MyEntities. An Entity with Key (PK) will not round-trip when: Entity is type [MyEntities.MyEntity] I keep having to manually open the EDMX file and correct the XML whenever I add scalars. Ideas on what's going on?

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• Query on MVVM pattern in WPF?

  - by Ashish Ashu

  I am implementing a MVVM pattern in my WPF application. My application main window is divided into four parts: Main Menu On the Top Outlook Navigation Control on the Left. A List View on the Middle. Another List view on the bottom. The Navigation control shows different setting (configuration) controls in the Tab items. All the four above are user controls which are placed in the main window. And corresponding to each user control there is separate view model which is bounded with a view model in the XAML of each control, however the model class remain the same between all the view model. And a MainWindow has a seperate View Model which is also bounded with a view model in the XAML of each control. Please help me out in framing a design in which each view models of all the controls above will interact with each other. Please let me know if my question is not clear to you!!

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• How to call parent window function in chrome browser?

  - by Pier Luigi

  HI, I've surprisingly found problems, in Chrome browser, in calling window parent javascript functions. If I have a window with a javascript function defined in it <script type="text/javascript"> function dolink() { . . . } </script> and I have an iframe inside that window that makes this call using jquery <script type="text/javascript"> $(function() { $('a.arglink').click(function() { window.parent.dolink($(this).attr('href')); return false; }); }); </script> the call to dolink function doesn't work. Stepping with chrome javascript debugger, it appears that window.parent.dolink is undefined. It's by design or a mistake that I made? In Firefox and IE it works fine.

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• Android SlidingDrawer in Eclipse IDE

  - by user295447

  I am trying to design an application for Android that makes use of the SlidingDrawer, but I have not been able to use the form (layout?) designer to add this element without producing an exception "IllegalArgumentException: The handle attribute is required and must refer to a valid child." As of March 17th, I believe I have everything up to date (Eclipse, and the Android SDK). All the SDK components have been installed. I have created two Android virtual devices, One for version 1.0, and one for version 2.1 when I figured out that 1.0 didn't support the SlidingDrawer. I have tried importing the samples provided in the SDK, as well as several other layouts from the web that I have found, all of which produce this same exception. My programming background is mostly C++, and I consider myself to be a novice programmer, so feel free to talk to me as if I were an idiot so that I will understand. ^^;

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• TDD - How to start really thinking TDD?

  - by user74825

  I have been reading about Agile, XP methodologies and TDDs. I have been in projects which states it needs to do TDD, but most of the tests are somehow integration tests or during the course of project TDD is forgotten in effort to finish codes faster. So, as far as my case goes, I have written unit tests, but I find myself going to start writing code first instead of writing a test. I feel there's a thought / design / paradigm change which is actually huge. So, though one really believes in TDD, you actually end up going back old style because of time pressure / project deliverables. I have few classes where I have pure unit tested code, but I can't seem to continue with the process, when mocks come into picture. Also, I see at times : "isn't it too trivial to write a test for it" syndrome. How do you guys think I should handle this?

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• vs2010: trying to debug javascript using Chrome: this is not a valid location for a breakpoint

  - by George

  Everytime I try to set a debug point in Javascript, eietehr while in Design mode or while runniong, I get the error: trying to set a breakpoint in javascript: this is not a valid location for a breakpoint When I go to VS2010's Options screen under Debugging Just In Time, I see that Managed, Native & Script are selected, I also placed the line "debugger;" in the first line of a javascript function that is called but the break is never hit. In the Web.Config (although this is probably for compiled code:): <compilation debug="true I'm reliving this problem on a new machine...Can u help? Edit: I left out a huge detail: Google Chrome is my default browser. (I am trying to debug a Chrome-only error.) Must I resort to other debug tools other than VS2010? I am thinking that it should work. Too hopeful, eh?

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• How to implement paging for datagrid using LINQ to Entities in wpf?

  - by Levelbit

  I'm new in wpf. My main problem is to understand how DataGrid works with its datacontext. It would help me a lot because I don't know how to make a universal paging usercontrol for all my datagrids in the projects for different database tables. DataGrid converts received DataContext from object to some kind of list. How it is implemented. I tried to do some casting from object to IQueryable to generalize thinig because base class of every entity in the entity model is EntityObject class. But it doesen't work in runtime although I don't receive complains at design time.

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• jqGrid using a servlet to store the data, how to access the data from a different java class

  - by Sam

  I'm using jqGrid for a table input and setting up the url as a servlet which will deal with the GET and POST requests and save the rows to a Java object. I'm using webwork web framework and I was wondering how I can get access to the object that the servlet is saving the data to. One way I have thought of is to just call the GET method from the Java action class which the servlet will return a JSON string with the object data. Is there a better design for doing this? This is probably not too clear so ask questions so I can help get across my point. Thanks

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• What is the advantage of WSDualHttpBinding in WCF?

  - by schmoopy

  How much benefit would there be to using WSDualHttpBinding with IIS hosted service vs. a client poll that calls the WCF service, assuming in the latter the service cached the data in question? This scenerio would be for a notify type of service where the clients need to be notified by the service when an event occurs. Specifically, what advantages would WSDualHttpBinding provide over polling? ie: Less network traffic, faster to design, easier to maintain, more control ??? From what i understand, WSDualHttpBinding is less scalable than client polling, so why use it at all? Edit: As Matt supplied, time critical can be one reason for the duplex binding. Here is what i have so far: WSDualHttpBinding adv: can get immediate response w/o waiting on polling timer dis: less scalable than WsHttpBinding dis: less firewall friendly I'll add to this based on comments, please let me know if i state anything incorrectly. thanks for you input :-)

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• jQuery to add vertical scroll bar for a fixed height div container

  - by Michael Mao

  Hi all: This is uni homework so sorry about :my password protected url Please enter usersame as "uts" and password as "10479475", without the wrapper quotes. It it almost completed, please follow simple steps to see where my problem dwells: step1: click on any continent highlighted on world map; step2: click on any city marked on continent map; step3: enter quantity ranging from 1 to 6 into the upper-right table; step4 : there you go, in the table below, once row is equal or greater than 3, then the size of table starts to "overlap" on top of the footer section and continues to grow, which is not what I want. I want to achieve the effect that the table size has a limited max-height, so once actual height exceeds the threshold, then I can have a vertical scroll bar so to "stack up" my table and not to break the overall structure. It turns out that my lazy initial design now gets myself stuck in a problem... Any suggestion and hint on how to get this?

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• Custom Tabcontrol in silverlight 4

  - by Archie

  Hello, I'm trying to design a tab control which will have a tabs on left hane hand side, and will have a text displayed vertically besides it. And will have the Page displayed in the main tab control. For reference you can visit : http://www.nseindia.com/ and click on any tab in the main menu. How can it be designed? I have created a style in App.xaml since it would be applicable to all tabs. But I'm not sure how to get the control's name in the page I would be using. Thanks.

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• Syntax error on token "QUOTE", VariableDeclaratorId expected after this token

  - by user356812

  I've posted a bigger chunk of the code below. You can see that initially QUOTE was procedural- coded in place. I'm trying to learn how to use declarative design so I want to do the same thing but by using resources. It seems like I need to access the string.xml thru the @R.id tag and identify QUOTE with that string value. But I don't know enough to negotiate this. Any tips? Thanks! public class circle extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(new GraphicsView(this)); } static public class GraphicsView extends View { //private static final String QUOTE = "Happy Birthday to David."; private final String QUOTE = getString(R.string.quote); ..... @Override protected void onDraw(Canvas canvas) { // Drawing commands go here canvas.drawPath(circle, cPaint); canvas.drawTextOnPath(QUOTE, circle, 0, 20, tPaint);

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• Inner synchronization on the same object as the outer synchronization

  - by Yaneeve

  Recently I attended a lecture concerning some design patterns: The following code had been displayed: public static Singleton getInstance() { if (instance == null) { synchronized(Singleton.class) { //1 Singleton inst = instance; //2 if (inst == null) { synchronized(Singleton.class) { //3 inst = new Singleton(); //4 } instance = inst; //5 } } } return instance; } taken from: Double-checked locking: Take two My question has nothing to do with the above mentioned pattern but with the synchronized block: Is there any benefit whatsoever to the double synchronization done in lines 1 & 3 with regards to the fact that the synchronize operation is done on the same Object?

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• How to ignore GUI as much as possible without rendering APP less GUI developer friendly

  - by pbernatchez

  The substance of an app is more important to me than its apperance, yet GUI always seems to dominate a disproportionate percentage of programmer time, development and target resource requirements/constraints. Ideally I'd like an application architecture that will permit me to develop an app using a lightweight reference GUI/kit and focus on non gui aspects to produce a quality app which is GUI enabled/friendly. I would want APP and the GUI to be sufficiently decoupled to maximize the ease for you GUI experts to plug the app into to some target GUI design/framework/context. e.g. targets such as: termcap GUI, web app GUI framework, desktop GUI, thin client GUI. In short: How do I mostly ignore the GUI, but avoid painting you into a corner when I don't even know who you are yet?

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• How to load a UIView from a NIB?

  - by Winder

  I have been using UIViewControllers and initWithNibName with much success, basically using them as a convenient way to design the view with Interface Builder. Unfortunately I have built a hierarchy of views before noticing this line in the UIViewController documentation: Note: You should not use view controllers to manage views that fill only a part of their window My question is this: Having a very simple NIB that only has a UIView in addition to the default First Responder and Owning Object, what is the simplest way to load the UIView into my code? I have not been able to get loadNibNamed:owner:options: to work at this point, but suspect the answer will involve it somehow.

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• micro-SD card initialization using SPI interface

  - by Ron

  I'm using a micro-SD card in an embedded design. The card is connected to a microcontroller using the SPI interface. It worked fine for all cards I've used before, but now my new card will not initialize. The card is a Transcend 2GB micro-SD card (TS2GUSD). After sending the initial clock train to switch to SPI mode I do the following: 1) CMD0 (Argument 0, CRC 0x95) - Response 0x01 - OK 2) CMD8 (Argument 0x000001AA, CRC 0x87) - Response 0x01 0x000001AA - Means it's SDC V2+ card, the Voltage range 2.7V~3.6V is supported - OK Then I should send the ACMD41 command, but when sending the CMD55 (argument 0, CRC 0) that must precede CMD41, I get response 0x05 - Illegal Command. I've also tried to send CMD1 (for MMC cards), but it gives a similar Illegal Command response. The code works fine with my Sandisk 2GB micro-SD card. Does anyone have any idea? Thanks, -Ron-

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• Call a web service and parse xml response in blackberry

  - by Nirmal

  Hello All... Currently I have a ready design for blackberry application. Now, I need to call the web service in my app, and that web service will give me some xml response. So, I need to parse that response from xml to some POJO. So, for parsing the xml response should I go with the basic DOM praser, or should I use any other J2ME specific prasing concept ? If anybody have any sample tutorial link for the same then it would be very much useful to me. Thanks in advance....

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• android: CheckedTextView cannot be checked?

  - by Yang

  Initially I wanted a checkmark where the text is placed on the left of the checkmark. After searching on this site I found out the best workaround is android:CheckedTextView? However, I found out that the checkmark cannot be changed manually by users. Is it by design? <CheckedTextView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/autoupdatecheckboxview" android:layout_width="fill_parent" android:layout_height="wrap_content" android:gravity="center_vertical" android:checkMark="?android:attr/listChoiceIndicatorMultiple" android:paddingLeft="6dip" android:paddingRight="6dip" android:text="Pop up a message when new data available" android:typeface="sans" android:textSize="16dip"/>

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• Custom form designer, move/resize controls using WinAPI

  - by jonny

  I have to fix some problems and enchance form designer written long ago for a database project. In Design Panel class code I encountered these lines private void DesignPanel_MouseDown(object sender, MouseEventArgs e) { if (e.Button == MouseButtons.Left) { (sender as Control).Capture = false; switch (FMousePosition) { case MousePosition.mpNone: SendMessage((sender as Control).Handle, WM_SYSCOMMAND, 0xF009, 0); break;// Move case MousePosition.mpRightBottom: SendMessage((sender as Control).Handle, WM_SYSCOMMAND, 0xF008, 0); break;//RB case MousePosition.mpLeftBottom: SendMessage((sender as Control).Handle, WM_SYSCOMMAND, 0xF007, 0); // ... here are similar cases ... case MousePosition.mpLeft: SendMessage((sender as Control).Handle, WM_SYSCOMMAND, 0xF001, 0); break;//L } } } FMousePosition indicates whether mouse was over any edge of selected control. What confusing me is these windows messages: it seems there is no documentation on WM_SYSCOMMAND with parameters 0xF001-0xF009 (maybe it starts some kind of 'drag/resize sequence'). Any ideas? If my suggestion is right, then how can I cancel these sequences?

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• Dynamic programming - Coin change decision problem?

  - by Tony

  I'm reviewing some old notes from my algorithms course and the dynamic programming problems are seeming a bit tricky to me. I have a problem where we have an unlimited supply of coins, with some denominations x1, x2, ... xn and we want to make change for some value X. We are trying to design a dynamic program to decide whether change for X can be made or not (not minimizing the number of coins, or returning which coins, just true or false). I've done some thinking about this problem, and I can see a recursive method of doing this where it's something like... MakeChange(X, x[1..n this is the coins]) for (int i = 1; i < n; i++) { if ( (X - x[i] ==0) || MakeChange(X - x[i]) ) return true; } return false; Converting this a dynamic program is not coming so easily to me. How might I approach this?

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• Calling WCF Service from Action Script 2

  - by Frank

  Hi All, I am a .NET programmer working with a Flash designer on a project. The design is that they will create a flash UI (implemented with AS2) to present a questionnaire. After it is completed by an end user, the will send me (a .net web service of some form) the answers to the questionnaire, I will perform a calculation, and I will send a response back (the response will likely be a single integer, though it may be a touple of (integer score, string description). Neither myself nor the designer is knowledgeable of Action Script. Does anyone have a snippet for such web service calls in AS2? Are there any soap libraries for AS2 that we could use, or should I expose a RESTful interface? Can it be as simple as having the designer concat the questionnaire answers into the query string of the service URL? What would be a typical data format for my response (xml, json, plain text) Thanks in advance for your help. Frank

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• How to grey out spinner in Android?

  - by Janusz

  I use two Spinner in my App. One of them is initially disabled because I need the user to select something in the first spinner to load the content of the second one. I would like to change the design of the second spinner to show the user that the spinner is not active, eg. grey the spinner out. How can I achieve this? If this is not possible how would you change this dialog to make it clear to the user that she has to select something in the first spinner?

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• Delphi connection to OpenEdge Progress-4GL Database

  - by Cesar Marrero

  Folks: Has anyone had success connecting to a Progress-4GL database with Delphi?   I've been unable to establish any connection with the ODBC driver provided by the vendor (Progress OpenEdge 10.1C Driver). I've entered (what I believe are) the right parameters, but keep on getting an error whenever I test the connection: "[DataDirect][ODBC Progress OpenEdge Wire Protocol driver] Socket closed." Background: I've been tasked to re-design a 13-year-old application, but the original programmer did not provide any supporting documents, passwords, configuration setup, etc. (I'm on my own)!   To make things worse, online help and useful documentation about Progress is scarce (I had never heard about this database until now). I want to examine the existing data, maybe create an ERD to familiarize myself with the schema, but I can't even access the data outside of the OpenEdge code. Any help is appreciated!

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• Where to use Controller.HttpContext

  - by Ben

  Hi, In my base controller's constructor I am calling an extension method that checks for specific cookies on the client. Currently I am using System.Web.HttpContext.Current to get the current context. However, I am lead to believe that I should be using Controller.HttpContext since it is more testable and contains additional information about the request. However, Controller.HttpContext returns null on creation (believe this is by design) but also on Initialize and Execute methods (unless I use Routing.RequestContext.HttpContext?). So if I should be using Controller.HttpContext instead of HttpContext.Current, at what point is it available to me in a request? Thanks Ben

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• Minimax algorithm: Cost/evaluation function?

  - by Dave

  Hi guys, A school project has me writing a Date game in C++ (example at http://www.cut-the-knot.org/Curriculum/Games/Date.shtml) where the computer player must implement a Minimax algorithm with alpha-beta pruning. Thus far, I understand what the goal is behind the algorithm in terms of maximizing potential gains while assuming the opponent will minify them. However, none of the resources I read helped me understand how to design the evaluation function the minimax bases all it's decisions on. All the examples have had arbitrary numbers assigned to the leaf nodes, however, I need to actually assign meaningful values to those nodes. Intuition tells me it'd be something like +1 for a win leaf node, and -1 for a loss, but how do intermediate nodes evaluate? Any help would be most appreciated.

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