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• OData / WCF Data Service - HTTP 500 Error

  - by Eric

  I have created an OData/WCF service using Visual Studio 2010 on Windows XP SP3 with all current patches installed. When I click on "view in browser", the service opens and I see the 3 tables from my EF model. However, when I add a table name ("Commands" in this case) to the end of the query string, rather than seeing the data from the table, I get an HTTP 500 error. (This error (HTTP 500 Internal Server Error) means that the website you are visiting had a server problem which prevented the webpage from displaying.). I have not only followed the examples from 2 sites, but have also tried running the sample application that the blog poster sent me (that works on his machine), and still am not having any luck. The blog post is at Exposing OData from an Entity Framework Model Does anyone have an idea why this is occurring and how to resolve it? Here is the output of the "View in Browser": <?xml version="1.0" encoding="utf-8" standalone="yes" ?> - <service xml:base="http://localhost:1883/VistaDBCommandService.svc/" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:app="http://www.w3.org/2007/app" xmlns="http://www.w3.org/2007/app"> - <workspace> <atom:title>Default</atom:title> - <collection href="Commands"> <atom:title>Commands</atom:title> </collection> - <collection href="Databases"> <atom:title>Databases</atom:title> </collection> - <collection href="Statuses"> <atom:title>Statuses</atom:title> </collection> </workspace> </service> ============================= Thanks, Eric

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• Django forms, inheritance and order of form fields

  - by Hannson

  I'm using Django forms in my website and would like to control the order of the fields. Here's how I define my forms: class edit_form(forms.Form): summary = forms.CharField() description = forms.CharField(widget=forms.TextArea) class create_form(edit_form): name = forms.CharField() The name is immutable and should only be listed when the entity is created. I use inheritance to add consistency and DRY principles. What happens which is not erroneous, in fact totally expected, is that the name field is listed last in the view/html but I'd like the name field to be on top of summary and description. I do realize that I could easily fix it by copying summary and description into create_form and loose the inheritance but I'd like to know if this is possible. Why? Imagine you've got 100 fields in edit_form and have to add 10 fields on the top in create_form - copying and maintaining the two forms wouldn't look so sexy then. (This is not my case, I'm just making up an example) So, how can I override this behavior? Edit: Apparently there's no proper way to do this without going through nasty hacks (fiddling with .field attribute). The .field attribute is a SortedDict (one of Django's internal datastructures) which doesn't provide any way to reorder key:value pairs. It does how-ever provide a way to insert items at a given index but that would move the items from the class members and into the constructor. This method would work, but make the code less readable. The only other way I see fit is to modify the framework itself which is less-than-optimal in most situations. In short the code would become something like this: class edit_form(forms.Form): summary = forms.CharField() description = forms.CharField(widget=forms.TextArea) class create_form(edit_form): def __init__(self,*args,**kwargs): forms.Form.__init__(self,*args,**kwargs) self.fields.insert(0,'name',forms.CharField()) That shut me up :)

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• How to call JSON asynchronous in xcode/ iphone develope

  - by Frames84

  I'm using the JSON framework hosting on Google. What and it's a news app that loads JSON feeds, when app goes off to load the feed I want to display the UIActivityIndicatorView but I've found my JSON Access code is not being called asynchronous which is locking the user interface. I have highlighted the function in the code and can't figuree out without breaking how to change the code. #import "JSON DataAccess Wrapper.h" #import "JSON.h" @implementation JSON_DataAccess_Wrapper @synthesize dataItemList; ////////////////////////////////////////////// /* START FEED CONNECTION/ HANDLE METHODS */ ////////////////////////////////////////////// - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { [responseData setLength:0]; } - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { [responseData appendData:data]; } - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error { //label.text = [NSString stringWithFormat:@"Connection failed: %@", [error description]]; } - (void)connectionDidFinishLoading:(NSURLConnection *)connection { [connection release]; } - (NSString *)stringWithUrl:(NSURL *)url { NSURLRequest *urlRequest = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReturnCacheDataElseLoad timeoutInterval:30]; NSData *urlData; NSURLResponse *response = nil; NSError *error = nil; /* HOW TO MAKE THE CALL BELOW ASYNCHRONOUS */ urlData = [NSURLConnection sendSynchronousRequest:urlRequest returningResponse:&response error:&error]; return [[NSString alloc] initWithData:urlData encoding:NSUTF8StringEncoding]; } -(id) objectWithUrl:(NSURL *)url { SBJSON *jsonParser = [SBJSON new]; NSString *jsonString = [self stringWithUrl:url]; return [jsonParser objectWithString:jsonString error:NULL]; } - (NSMutableArray *) downloadJSONFeed { id response = [self objectWithUrl:[NSURL URLWithString:@"http://www.mysite.co.uk/index2.php?option=JSON"]]; NSMutableArray *feed = (NSMutableArray *) response; return feed; }

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• Asp.Net MVC Tutorial Unit Tests

  - by Nicholas

  I am working through Steve Sanderson's book Pro ASP.NET MVC Framework and I having some issues with two unit tests which produce errors. In the example below it tests the CheckOut ViewResult: [AcceptVerbs(HttpVerbs.Post)] public ViewResult CheckOut(Cart cart, FormCollection form) { // Empty carts can't be checked out if (cart.Lines.Count == 0) { ModelState.AddModelError("Cart", "Sorry, your cart is empty!"); return View(); } // Invoke model binding manually if (TryUpdateModel(cart.ShippingDetails, form.ToValueProvider())) { orderSubmitter.SubmitOrder(cart); cart.Clear(); return View("Completed"); } else // Something was invalid return View(); } with the following unit test [Test] public void Submitting_Empty_Shipping_Details_Displays_Default_View_With_Error() { // Arrange CartController controller = new CartController(null, null); Cart cart = new Cart(); cart.AddItem(new Product(), 1); // Act var result = controller.CheckOut(cart, new FormCollection { { "Name", "" } }); // Assert Assert.IsEmpty(result.ViewName); Assert.IsFalse(result.ViewData.ModelState.IsValid); } I have resolved any issues surrounding 'TryUpdateModel' by upgrading to ASP.NET MVC 2 (Release Candidate 2) and the website runs as expected. The associated error messages are: *Tests.CartControllerTests.Submitting_Empty_Shipping_Details_Displays_Default_View_With_Error: System.ArgumentNullException : Value cannot be null. Parameter name: controllerContext* and the more detailed at System.Web.Mvc.ModelValidator..ctor(ModelMetadata metadata, ControllerContext controllerContext) at System.Web.Mvc.DefaultModelBinder.OnModelUpdated(ControllerContext controllerContext, ModelBindingContext bindingContext) at System.Web.Mvc.DefaultModelBinder.BindComplexModel(ControllerContext controllerContext, ModelBindingContext bindingContext) at System.Web.Mvc.Controller.TryUpdateModel[TModel](TModel model, String prefix, String[] includeProperties, String[] excludeProperties, IValueProvider valueProvider) at System.Web.Mvc.Controller.TryUpdateModel[TModel](TModel model, IValueProvider valueProvider) at WebUI.Controllers.CartController.CheckOut(Cart cart, FormCollection form) Has anyone run into a similar issue or indeed got the test to pass?

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• How to use OSGi getServiceReference() right

  - by Jens

  Hello, I am new to OSGi and came across several examples about OSGi services. For example: import org.osgi.framework.*; import org.osgi.service.log.*; public class MyActivator implements BundleActivator { public void start(BundleContext context) throws Exception { ServiceReference logRef = context.getServiceReference(LogService.class.getName()); } } My question is, why do you use getServiceReference(LogService.class.getName()) instead of getServiceReference("LogService") If you use LogService.class.getName() you have to import the Interface. This also means that you have to import the package org.osgi.services.log in your MANIFEST.MF. Isn't that completely counterproductive if you want to reduce dependencies to push loose coupling? As far as I know one advantage of services is that the service consumer doesn't have to know the service publisher. But if you have to import one specific Interface you clearly have to know who's providing it. By only using a string like "LogService" you would not have to know that the Interface is provided by org.osgi.services.log.LogService. What am I missing here?

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• Apache2: mod_wsgi or mod_python, which one is better?

  - by Algorist

  Hi, I am planning to write web service in python. But, I found wsgi also does the similar thing. Which one can be preferred? Thank you Bala Update I am still confused. Please help. Better in my sense means: 1. Bug will be fixed periodically. 2. Chosen by most developers. 3. Additional features like authentication tokens like AWS, can be supported out of the box. 4. No strong dependency on version.( I see that wsgi requires python 2.6) 5. All python libraries will work out of the box. 6. Scalable in the future. 7. Future upgrade don't cause any issues. With my limited experience, I want these features. There might be some I might be missing. Thanks Bala Update I am sorry for all the confusion caused. I just want to expose a restful web services in python language. Is there a good framework?

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• Is ASP.NET MVC destined to replace Webforms?

  - by johnny

  I found these questions, but a couple of them were a little old: http://stackoverflow.com/questions/191556/should-i-pursue-asp-net-webforms-or-asp-net-mvc http://stackoverflow.com/questions/88787/do-you-think-asp-net-mvc-will-compete-with-asp-net-webforms http://stackoverflow.com/questions/722637/asp-net-mvc-asp-net-webforms-why I do not believe these are duplicates and might be old enough that new light can be shed. If not please close this. I know that no one framework or language is necessarily the only tool for every job. But, do you see MVC eclipsing webforms or webforms going lower on the priority list for Microsoft? They will have to keep webforms for a long time because so many have invested in it, but they don't have to keep adding new functionality for it. I don't know if this is a good example, but it reminds me of web parts. I never saw much improvement in it from Microsoft. It works and I thought it was great until I started to really try and get a lot out of it. Then from what I could see it just wasn't being pursued by Microsoft that much, though it stayed in Visual Studio. Maybe that's a bad example; just what I remembered. EDIT: Also, if anyone has any statements from Microsoft on this subject it is appreciated. No offense to anyone. I was only hoping for something official.

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• Switching between iScroll and standard WebView Scrolling functionality

  - by Jonathan

  I'm using iScroll 4 for my rather heavy iPhone web/Phonegap app and trying to find a way to switch between iScrolls scrolling functionality and standard "native" webview scrolling, basically on click. Why I want this is described below. My app has several different subpages all in one file. Some subpages have input fields, some don't. As we all know, iScroll + input fields = you're out of luck. I've wrapped iScrolls wrapper div (and all its functionality) around the one sub page where scrolling is crucial, and where there are no input fields. The other sections, I've simply placed outside this div, which gives these no scrolling functionality at all. I've of course tried wrapping all inside the wrapper and enabling/disabling scroll (shown below) but that didn't work me at all: myScroll.disable() myScroll.enable() By placing some sub pages outside the main scrolling area / iscroll div, I've disabled both iScrolls and the standard webview scrolling (the latter - which i guess iScroll does) which leaves me with only basic basic scrolling, hence basically no scrolling at all. One can move around vertically, but once you let go of the screen with, the "scrolling" stops. Quite naturally but alas so nasty. Therefore, I'm searching for a way to enable standard webview scrolling on the sub pages placed outside of iScroll's wrapper div. I've tried different approaches such as the one above and by using: document.removeEventListener('touchmove', preventDefault, false); document.removeEventListener('touchmove', preventDefault, true); But with no success. Sorry for not providing you guys with any hard code or demos to test out for yourselves, it's simply too much code and it would be presented so out of its context, nobody would be able to debug it. So, is there a way n javascript to do this, switching between iScroll scrolling functionality and standard "native" webview scrolling? I would rather not rebuild the entire DOM framework so a solution like the one described above would be preferable.

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• Request for the permission of type 'System.Data.Odbc.OdbcPermission.. help needed

  - by Matt

  I'm getting the following error when trying to connect to a remote mysql server. Request for the permission of type 'System.Data.Odbc.OdbcPermission, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed. I've installed the odbc 5.1 driver, and can connect to the database using the Data Sources (ODBC) tool in Control Panel. However when I try and run my C# scrip to connect, I get the above error. I've read its something to do with trust levels or something? I don't quite understand what people were talking about though. I went to C:... Framework/v2.0.50727/CONFIG and added to the medium and high trust.config files, but that didn't help.. Can someone help me out here please? My connection string is MyConString = "DRIVER={MySQL ODBC 5.1 Driver};" + "SERVER=" + m_strHost + ";" + "PORT=3306;" + "DATABASE=" + m_strDatabase + ";" + "UID=" + m_strUserName + ";" + "PWD=" + m_strPassword + ";" + "OPTION=3;";

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• Using SDL2_gfx issues using C++

  - by Lance Zimmerman

  When I use the it with the common.c /common.h files that come with it, if I use the cpp instead of c extension using VS201X I get the LNK2019: unresolved external symbol _SDL_main What that means is if I change the file containing main to test.c it compiles. When I change it back to text.cpp it fails to compile. I think that means it only works as a C compile. Here is the code I copied from SDL2_gfxPrimitives.c. (Spaces added so they would show up.) #include < stdio.h> #include < stdlib.h> #include < string.h> #include < math.h> #include < time.h> #include "common.h" #include "SDL2_gfxPrimitives.h" static CommonState *state; int main(int argc, char* argv[]) { /* Initialize test framework */ state = CommonCreateState(argv, SDL_INIT_VIDEO); return 1; } I need to use the library in C++ but it seems I don't know enough to figure out how. Any help would be appreciated, I've spent two days attempting to figure this out.

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• Create Jinja2 macros that put content in separate places

  - by Brian M. Hunt

  I want to create a table of contents and endnotes in a Jinja2 template. How can one accomplish these tasks? For example, I want to have a template as follows: {% block toc %} {# ... the ToC goes here ... #} {% endblock %} {% include "some other file with content.jnj" %} {% block endnotes %} {# ... the endnotes go here ... #} {% endblock %} Where the some other file with content.jnj has content like this: {% section "One" %} Title information for Section One (may be quite long); goes in Table of Contents ... Content of section One {% section "Two" %} Title information of Section Two (also may be quite long) <a href="#" id="en1">EndNote 1</a> <script type="text/javsacript">...(may be reasonably long) </script> {# ... Everything up to here is included in the EndNote #} Where I say "may be quite/reasonably long" I mean to say that it can't reasonably be put into quotes as an argument to a macro or global function. I'm wondering if there's a pattern for this that may accommodate this, within the framework of Jinja2. My initial thought is to create an extension, so that one can have a block for sections and end-notes, like-so: {% section "One" %} Title information goes here. {% endsection %} {% endnote "one" %} <a href="#">...</a> <script> ... </script> {% endendnote %} Then have global functions (that pass in the Jinja2 Environment): {{ table_of_contents() }} {% include ... %} {{ endnotes() }} However, while this will work for endnotes, I'd presume it requires a second pass by something for the table of contents. Thank you for reading. I'd be much obliged for your thoughts and input. Brian

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• How to set up RPX widget and facebook app to be able to authenticate with rpx_now?

  - by Andrei

  Using the sample app for rpx_now gem ( http://github.com/grosser/rpx_now_example) on localhost:3000, I have successfully logged in via Google Accounts, myOpenID, Yahoo, but cannot make it via Facebook. In the RPX app/widget settings I have set my facebook-app key and secret. In my facebook app settings, the Connect URL is myappname.rpxnow.com. But when I try to connect, then I don't even see a facebook login page, just a number of redirects and I am back to my localhost with the following exception http://gist.github.com/386520 . Before I was successfully connecting with oauth2 gem, however, without fetching user data - only authentication. That time I set only key/secret and localhost as my Connect URL. Currently, I don't even ask for email etc., but still the same problem. Can it happen because rpx_now cannot get requested user data from facebook? Or it is a problem of facebook key/secret? May be I need to provide more settings of my facebook app? RPXNow::ApiError in UsersController#create Got error: Invalid parameter: token (code: 1), HTTP status: 200 RAILS_ROOT: /home/Andrei/rpx_now_example Application Trace | Framework Trace | Full Trace /usr/lib/ruby/gems/1.8/gems/rpx_now-0.6.20/lib/rpx_now/api.rb:71:in `parse_response' /usr/lib/ruby/gems/1.8/gems/rpx_now-0.6.20/lib/rpx_now/api.rb:21:in `call' /usr/lib/ruby/gems/1.8/gems/rpx_now-0.6.20/lib/rpx_now.rb:23:in `user_data' /home/Andrei/rpx_now_example/app/controllers/users_controller.rb:16:in `create' Request Parameters: None Show session dump Response Headers: {"Content-Type"="", "Cache-Control"="no-cache"}

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• DataTableReader is invalid for current DataTable 'TempTable'

  - by Sk93

  Hi, I'm getting the following error whenever my code creates a DataTableReader from a valid DataTable Object: "DataTableReader is invalid for current DataTable 'TempTable'." The thing is, if I reboot my machine, it works fine for an undertimed amount of time, then dies with the above. The code that throws this error could have been working fine for hours and then: bang. you get this error. It's not limited to one line either; it's every single location that a DataTableReader is used. Also, this error does NOT occur on the production web server - ever. This is an example of one of the lines where it falls over: If I step over this line, I get this: However, if I do this in the immediate window: I get no problems. Same goes if I actually use that line in the code. This has been driving me nuts for the best part of a week, and I've failed to find anything on Google that could help (as I'm pretty positive this isn't a coding issue). Some technical info: DEV Box: Vista 32bit (with all current windows updates) Visual Studio 2008 v9.0.30729.1 SP dotNet Framework 3.5 SP1 SQL Server: Microsoft SQL Server 2005 Standard Edition- 9.00.4035.00 (X64) Windows 2003 64bit (with all current windows updates) Web Server: Windows 2003 64bit (with all current windows updates) any help, ideas, or advice would be greatly appreciated! Cheers, Ian

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• Error when instantiating .NET/COM interop class via classic ASP

  - by Lee D

  Hi all, I am having a problem when trying to instantiate a C# .NET class that's been exposed to COM in a classic ASP application. I've used tlbexp to generate a typelib and registered it in Component Services; now when trying to create the object as such: Server.CreateObject("The.Class.Name") I am getting the error: Server object error 'ASP 0177 : 80131534' Server.CreateObject Failed I've searched around online for information on this error, and found numerous discussions but no solution. The error code 0x80131534 apparently means "COR_E_TYPEINITIALIZATION, a type failed to initialize", which would suggest the problem would be in the constructor. The constructor of the class in question sets a private field to an instance of another class from the same assembly, and then reads some configuration settings from an XML file. This behaviour is unit tested and I've checked that the file exists; I can't see anything else that could be breaking in there. A few other points which may or may not be of use: A test .NET project referencing the DLL can instantiate the class just fine; however a test VB6 project referencing the TLB blows up with the same error. Both the DLL and the TLB are in the same location. This application is running locally, on Windows XP Professional SP3 and IIS 5.1. The .NET assembly is built with .NET Framework 2.0, although 3.5 is installed on the machine. I know other people who don't get this error on their builds, so I believe it may be something environmental. Any suggestions are welcome as I've been struggling to fix this for some time. Thanks in advance.

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• geocoder.getFromLocationName returns only null

  - by test

  Hello, I am going out of my mind for the last 2 days with an IllegalArgumentException error i receive in android code when trying to get a coordinates out of an address, or even reverse, get address out of longitude and latitude. this is the code, but i cannot see an error. is a standard code snippet that is easily found on a google search. public GeoPoint determineLatLngFromAddress(Context appContext, String strAddress) { Geocoder geocoder = new Geocoder(appContext, Locale.getDefault()); GeoPoint g = null; try { System.out.println("str addres: " + strAddress); List<Address> addresses = geocoder.getFromLocationName(strAddress, 5); if (addresses.size() > 0) { g = new GeoPoint((int) (addresses.get(0).getLatitude() * 1E6), (int) (addresses.get(0).getLongitude() * 1E6)); } } catch (Exception e) { throw new IllegalArgumentException("locationName == null"); } return g; } These are the permissions from manifest.xml file: <uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /> <uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" /> I do have the Google Api key declared too: <uses-library android:name="com.google.android.maps" /> From the code snippet above, geo coder is not null, neither is the address or appContext, and i stumble here: geocoder.getFromLocationName(strAddress, 5); I did a lot of google searching and found nothing that worked, and the most important info i found is this: ""The Geocoder class requires a backend service that is not included in the core android framework." Sooo, i am confuzed now. What do I have to call, import, add, use in code.... to make this work? I am using Google Api2.2, Api level 8. If somebody has found a solution for this, or a pointer for documentation, something that i didn't discover, please let us know. Thank you for your time.

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• Backend raising (INotify)PropertyChanged events to all connected clients?

  - by Jörg Battermann

  One of our 'frontend' developers keeps requesting from us backend developers that the backend notifies all connected clients (it's a client/server environment) of changes to objects. As in: whenever one user makes a change, all other connected clients must be notified immediately of the change. At the moment our architecture does not have a notification system of that kind and we don't have a sort of pub/sub model for explicitly chosen objects (e.g. the one the frontend is currently implementing).. which would make sense in such a usecase imho, but obviously requires extra implementation. However, I thought frontends typically check for locks for concurrently existing user changes on the same object and rather pull for changes / load on demand and in the background rather than the backend pushing all changes to all clients for all objects constantly.. which seems rather excessive to me. However, it's being argumented that e.g. the MS Entity Framework does in fact publish (INotify)PropertyChanged not only for local changes, but for all such changes including other client connections, but I have found no proof or details regarding this. Can anyone shed some light into this? Do other e.g. ORMs etc provide broadcasted (INotify)PropertyChanged events on entities?

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• invalid viewstate error - OnPreRender

  - by dan

  I'm getting 100+ errors per day on my website with System.Web.HttpException: Invalid viewstate. The website is asp.net 3.5 running on iis6 , not running in a web-garden/web-farm , single server. Here are a few sample errors. Machine: ML Framework Version: 2.0.50727.3603 Assembly Version: 6.5.3664.33889 Source: http://www.domain.com/WebResource.axd?d=z5VmXXoSLLpQHoPictureAlert Exception: System.Web.HttpException: Invalid viewstate. at System.Web.UI.Page.DecryptStringWithIV(String s, IVType ivType) at System.Web.Handlers.AssemblyResourceLoader.System.Web.IHttpHandler.ProcessRequest(HttpContext context) at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) Machine: MLFramework Version: 2.0.50727.3603 Assembly Version: 6.5.3664.33889 Source: http://www.mydomain.com/ScriptResource.axd?d=SE0Ej7OlEAx91j2Cjv_6KkRPplqT-5wB4M7CZPdGdGn3LahLwqlRPApUcdxBsbFXYHZ91Q76FHAHWgHs8SmOC4zemr7 siym0QY0rF3XtJTu%3C/a%3E%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%3Ca%20id= Exception: System.Web.HttpException: Invalid viewstate. at System.Web.UI.Page.DecryptStringWithIV(String s, IVType ivType) at System.Web.UI.Page.DecryptString(String s) at System.Web.Handlers.ScriptResourceHandler.DecryptParameter(NameValueCollection queryString) at System.Web.Handlers.ScriptResourceHandler.ProcessRequestInternal(HttpResponse response, NameValueCollection queryString, VirtualFileReader fileReader) at System.Web.Handlers.ScriptResourceHandler.ProcessRequest(HttpContext context) at System.Web.Handlers.ScriptResourceHandler.System.Web.IHttpHandler.ProcessRequest(HttpContext context) at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) i already tried wraping all inline javascript with //<![CDATA[ //]]> i already set enableViewStateMac to false. From looking at all the errors guessing out of the "d" paramter it seems to focus on a single usercontrol on my website. in this control i change the visiblity of div's + text in the usercontrol OnPreRender function. protected override void OnPreRender(EventArgs e) { base.OnPreRender(e); PreparePage(); } Can the errors be related to the usercontrol behavioral? thanks!

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• What's the strangest corner case you've seen in C# or .NET?

  - by Jon Skeet

  I collect a few corner cases and brain teasers and would always like to hear more. The page only really covers C# language bits and bobs, but I also find core .NET things interesting too. For example, here's one which isn't on the page, but which I find incredible: string x = new string(new char[0]); string y = new string(new char[0]); Console.WriteLine(object.ReferenceEquals(x, y)); I'd expect that to print False - after all, "new" (with a reference type) always creates a new object, doesn't it? The specs for both C# and the CLI indicate that it should. Well, not in this particular case. It prints True, and has done on every version of the framework I've tested it with. (I haven't tried it on Mono, admittedly...) Just to be clear, this is only an example of the kind of thing I'm looking for - I wasn't particularly looking for discussion/explanation of this oddity. (It's not the same as normal string interning; in particular, string interning doesn't normally happen when a constructor is called.) I was really asking for similar odd behaviour. Any other gems lurking out there?

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• How to use an OSGi service from a web application?

  - by Jaime Soriano

  I'm trying to develop a web application that is going to be launched from a HTTP OSGi service, this application needs to use other OSGi service (db4o OSGi), for what I need a reference to a BundleContext. I have tried two different approaches to get the OSGi context in the web application: Store the BundleContext of the Activator in an static field of a class that the web service can import and use. Use FrameworkUtil.getBundle(this.getClass()).getBundleContext() (being this an instance of MainPage, a class of the web application). I think that first option is completely wrong, but anyway I'm having problems with the class loaders in both options. In the second one it raises a LinkageError: java.lang.LinkageError: loader constraint violation: loader (instance of org/apache/felix/framework/ModuleImpl$ModuleClassLoader) previously initiated loading for a different type with name "com/db4o/ObjectContainer" Also tried with Equinox and I have a similar error: java.lang.LinkageError: loader constraint violation: loader (instance of org/eclipse/osgi/internal/baseadaptor/DefaultClassLoader) previously initiated loading for a different type with name "com/db4o/ObjectContainer" The code that provokes the exception is: ServiceReference reference = context.getServiceReference(Db4oService.class.getName()); Db4oService service = (Db4oService)context.getService(reference); database = service.openFile("foo.db"); The exception is raised in the last line, database class is ObjectContainer, if I change the type of this variable to Object exception is not raised, but It's not useful as an Object :)

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• Modeling a Generic Relationship in a Database

  - by StevenH

  This is most likely one for all you sexy DBAs out there: How would I effieciently model a relational database whereby I have a field in an "Event" table which defines a "SportType". This "SportsType" field can hold a link to different sports tables E.g. "FootballEvent", "RubgyEvent", "CricketEvent" and "F1 Event". Each of these Sports tables have different fields specific to that sport. My goal is to be able to genericly add sports types in the future as required, yet hold sport specific event data (fields) as part of my Event Entity. Is it possible to use an ORM such as NHibernate / Entity framework which would reflect such a relationship? I have thrown together a quick C# example to express my intent at a higher level: public class Event<T> where T : new() { public T Fields { get; set; } public Event() { EventType = new T(); } } public class FootballEvent { public Team CompetitorA { get; set; } public Team CompetitorB { get; set; } } public class TennisEvent { public Player CompetitorA { get; set; } public Player CompetitorB { get; set; } } public class F1RacingEvent { public List<Player> Drivers { get; set; } public List<Team> Teams { get; set; } } public class Team { public IEnumerable<Player> Squad { get; set; } } public class Player { public string Name { get; set; } public DateTime DOB { get; set;} }

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• Unit Testing using InternalsVisibleToAttribute requires compiling with /out:filename.ext?

  - by Will Marcouiller

  In my most recent question: Unit Testing Best Practice? / C# InternalsVisibleTo() attribute for VBNET 2.0 while testing?, I was asking about InternalsVisibleToAttribute. I have read the documentation on how to use it, and everything is fine and understood. However, I can't instantiate my class Groupe from my Testing project. I want to be able to instantiate my internal class in my wrapper assembly, from my testing assembly. Any help is appreciated! EDIT #1 Here's the compile-time error I get when I do try to instantiate my type: Erreur 2 'Carra.Exemples.Blocs.ActiveDirectory.Groupe' n'est pas accessible dans ce contexte, car il est 'Private'. C:\Open\Projects\Exemples\Src\Carra.Exemples.Blocs.ActiveDirectory\Carra.Exemples.Blocs.ActiveDirectory.Tests\GroupeTests.vb 9 18 Carra.Exemples.Blocs.ActiveDirectory.Tests (This says that my type is not accessible in this context, because it is private.) But it's Friend (internal)! EDIT #2 Here's a piece of code as suggested for the Groupe class implementing the Public interface IGroupe: #Region "Importations" Imports System.DirectoryServices Imports System.Runtime.CompilerServices #End Region <Assembly: InternalsVisibleTo("Carra.Exemples.Blocs.ActiveDirectory.Tests")> Friend Class Groupe Implements IGroupe #Region "Membres privés" Private _classe As String = "group" Private _domaine As String Private _membres As CustomSet(Of IUtilisateur) Private _groupeNatif As DirectoryEntry #End Region #Region "Constructeurs" Friend Sub New() _membres = New CustomSet(Of IUtilisateur)() _groupeNatif = New DirectoryEntry() End Sub Friend Sub New(ByVal domaine As String) If (String.IsNullOrEmpty(domaine)) Then Throw New ArgumentNullException() _domaine = domaine _membres = New CustomSet(Of IUtilisateur)() _groupeNatif = New DirectoryEntry(domaine) End Sub Friend Sub New(ByVal groupeNatif As DirectoryEntry) _groupeNatif = groupeNatif _domaine = _groupeNatif.Path _membres = New CustomSet(Of IUtilisateur)() End Sub #End Region And the code trying to use it: #Region "Importations" Imports NUnit.Framework Imports Carra.Exemples.Blocs.ActiveDirectory.Tests #End Region <TestFixture()> _ Public Class GroupeTests <Test()> _ Public Sub CreerDefaut() Dim g As Groupe = New Groupe() Assert.IsNotNull(g) Assert.IsInstanceOf(Groupe, g) End Sub End Class EDIT #3 Damn! I have just noticed that I wasn't importing the assembly in my importation region. Nope, didn't solve anything =( Thanks!

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• deserialize Json using JavaScriptSerializer Custom Types

  - by Dave

  I have a RESTFUL WCF service returning a .NET custom type as json string. I am using .NET 3.5 framework and I am using JavaScriptSerializer for deserializing it in to my custom type. Serialization to json is handled by WCF. using (WebResponse resp = req.GetResponse()) { using (System.IO.StreamReader sreader = new System.IO.StreamReader(resp.GetResponseStream())) { string jsonString = sreader.ReadToEnd(); CustomType myType = new CustomType(); System.Web.Script.Serialization.JavaScriptSerializer serializer = new System.Web.Script.Serialization.JavaScriptSerializer(); myType = serializer.Deserialize<CustomType>(jsonString); return myType; } } The problem is that, I have a property (or element) of the CustomType which is generic list of another custom type ChildObject. They are in different namespaces. When I deserialize using the code above, I get all the properties of the CustomType myType including a list of ChildObject. But all the properties of the ChildObject is null. The string returned from the stream reader has all the values for the ChildObject. the values are lost when deserializing. Can anyone help me with this please?

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• externalizing junit stub objects.

  - by Ajay

  Hi!    In my project we created stub files for testing junits in java(factories) itself. However, we have to externalize these stubs. After seeing a number of serializers/deserializers, we settled on using XStream to serialize and deserialize these stub objects. XStream works like a charm. Its pretty good at what it claims to be. Previously, we had a single factory class say AFactory which produced all the stubs needed for testing different test cases. Now when externalizing each of the stub generated, we hit a road block. We had to create 1 xml file for each stub produced by the factory. For example, public final class AFactory{ public static A createStub1(){ /*Code here */} public static A createStub2(){ /*Code here */} public static A createStub3(){ /*Code here */} } Now, when trying to move this stubs to external files, we had to create 1 xml file for each stub created(A-stub1.xml, A-stub2.xml and A-stub3.xml). The problem with this approach is that, it leads to proliferation of xml stub files. I was thinking, how about keeping all the stubs related to a single bean class in a single xml file. <?xml version="1.0"?> <stubs class="A"> <stub id="stub1"> <!-- Here comes the externalized xml stub representation --> </stub> <stub id="stub2"> </stub> </stubs> Is there a framework which allows you keep all the stub in xml representation in a single xml file as above ? Or What do you guys suggest should be the right approach to adhere to ?

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• addthis api? Is it possible to bookmark another URL?

  - by Newbie

  Hello! At the moment, I try to include addthis social-bookmarks to my site. My problem is, that I have to bookmark another link than the url on my site. Instead of www.example.com, I have to bookmark www.example.com?media=my-media-file. From the beginning: A User comes to my site. On my site are several movies. He can click on a movie thumbnail and watch the movie without reloading the site (javascript). Now he can click on my social bookmark icon to share this movie. Now the addthis framework thinks that the User want's to share www.example.com (cause this is whats in my url). But I want the user to share www.example.com?media=foo-bar . Opening www.example.com?media=foo-bar for the correct movie is still working, but no social bookmaring. I hope you understand my problem and can help me. I searched without success in the addthis api. So, can u help me?

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• google appengine local datastore integration testing with spring

  - by mirror303

  Hi all, I want to write some integration tests to see how my spring-managed DAO's behave when talking to the appengine datastore. Following the spring manual I will be providing my test-classes with the proper annotations: @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(locations = { "classpath:applicationContext.xml" }) After a lot of browsing I found this blog post dating back to august '09 from somebody doing exactly what I want to achieve. It involves writing a TestEnvironment class that implements ApiProxy.Environment plus talking to ApiProxyLocalImpl. However, if I look at the current docs (for version 1.3.1), it seems that this has been replaced by newing an instance of the framework provided LocalDatastoreServiceTestConfig which is passed to a LocalServiceTestHelper. It is too bad that the appengine docs don't show an example how to do this with JPA because then the spring wiring would be trivial. Trying to follow the route outlined in the blog posting has me running into a compiler messages telling me that classes such as ApiProxyLocalImpl are not visible by me. Hence, there must be a new way of doing it, which probably involves the LocalServiceTestHelper. My question: Does anybody know how? I know I will need to configure an EntityManagerFactory and provide it with the Datastore connection somehow... but how? :)

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