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• SQLAuthority News – A Conversation with an Old Friend – Sri Sridharan

  - by pinaldave

  Sri Sridharan is my old friend and we often talk on GTalk. The subject varies from Life in India/USA, movies, musics, and of course SQL. We have our differences when we talk about food or movie but we always agree when we talk about SQL. Yesterday while chatting with him we talked about SQLPASS and the conversation lasted for a long time. Here is the conversation between us on GTalk. I have removed a few of the personal talks and formatted into paragraphs as GTalk often shows stuff out of formatting. Pinal: Sri, Congrats on running for the PASS BoD again. You were so close last year. What made you decide to run again this year? Sri: Thank you Pinal for your leadership in the PASS India Community and all the things you do out there. After coming so close last year, there was no doubt in my mind that I will run again. I was truly humbled by the support I got from the community. Growing up in India for over 25 years, you are brought up in a very competitive part of the world. Right from the pressure of staying in the top of the class from kindergarten to your graduation, the relentless push from your parents about studying and getting good grades (and nothing else matters), you land up essentially living in a pressure cooker. To survive that relentless pressure, you need to have a thick skin, ability to stand up for who you really are , what you want to accomplish and in the process stay true those values. I am striving for a greater cause, to make PASS an organization that can help people with their SQL Server careers, to make PASS relevant to its chapter members, to make PASS an organization that every SQL professional in the world wants to be connected with. Just because I did not get elected or appointed last year does not mean that these causes are not worth fighting. Giving up upon failing the first time is simply not in me. If I did that, what message would I send to those who voted for me? What message would I send to my kids? Pinal: As someone who has such strong roots in India, what can the Indian PASS Community expect from you? Sri: First of all, I think fostering a regional leadership is something PASS must encourage as part of its global growth plan. For PASS global being able to understand all the issues in a region of the world and make sound decisions will be a tough thing to do on a continuous basis. I expect people like you, chapter leaders, regional mentors, MVPs of the region start playing a bigger role in shaping the next generation of PASS. That is something I said in my campaign and I still stand by it. I would like to see growth in the number of chapters in India. The current count does not truly represent the full potential of that region. I was pretty thrilled to see the Bangalore SQLSaturday happen early this year. I would like to see more of SQLSaturday events, at least in the major metro cities. I know the issues in India are very different from the rest of the world. So the formula needs to be tweaked a little for it to work better in India. Once the SQLSaturday model is vetted out, maybe there could be enough justification to have SQLRally India. PASS needs to have a premier SQL event in that region. Going to USA or Europe for that matter is incredibly hard due to VISA issues etc. So this could be a case of where PASS comes closer to where the community is. Pinal: What portfolio would take on if you are elected to the PASS Board? Sri: There are some very strong folks on the PASS Board today. The President discusses the portfolios with the group and makes the final call on the portfolios. I am also a fan of having a team associated with the portfolios. In that case, one person is the primary for a portfolio but secondary on a couple of other portfolios. This way people on the board have a direct vested interest in a few portfolios. Personally, I know I would these portfolios good justice – Chapters, Global Growth and Events (SQLSat, SQLRally). I would try to see if we can get a director to focus on Volunteers.  To me that is very critical for growth in the international regions. Pinal: This is an interesting conversation with you Sri. I know you so long time but this is indeed inspiring to many. India is a big country and we appreciate your thoughts. Sri: Thank you very much for taking time to chat with me today. Cheers. There are pretty strong candidates for SQLPASS Board of Elections this year. I know all of them in person and honestly it is going to be extremely difficult to not to vote for anybody. I am indeed in a crunch right now how to pick one over another. Though the choice is difficult, I encourage you to vote for them. I am extremely confident that the new board of directors will all have the same goal – Better SQL Server Community. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: Database, DBA, PostADay, SQL, SQL Authority, SQL PASS, SQL Query, SQL Server, SQL Tips and Tricks, SQLAuthority News, T SQL, Technology

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• Jackson + Builder Pattern?

  - by Gili

  I'd like Jackson to deserialize a class with the following constructor: public Clinic(String name, Address address) Deserializing the first argument is easy. The problem is that Address is defined as: public class Address { private Address(Map<LocationType, String> components) ... public static Builder { public Builder setCity(String value); public Builder setCountry(String value); public Address create(); } } and is constructed like this: new Address.Builder().setCity("foo").setCountry("bar").create(); Is there a way to get key-value pairs from Jackson in order to construct the Address myself? Alternatively, is there a way to get Jackson to use the Builder class itself?

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• How can I handle template dependencies in Template Toolkit?

  - by Smack my batch up

  My static web pages are built from a huge bunch of templates which are inter-included using Template Toolkit's "import" and "include", so page.html looks like this: [% INCLUDE top %] [% IMPORT middle %] Then top might have even more files included. I have very many of these files, and they have to be run through to create the web pages in various languages (English, French, etc., not computer languages). This is a very complicated process and when one file is updated I would like to be able to automatically remake only the necessary files, using a makefile or something similar. Are there any tools like makedepend for C files which can parse template toolkit templates and create a dependency list for use in a makefile? Or are there better ways to automate this process?

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• How to build an interactive search engine web interface using python

  - by asmaier

  I have build a static web interface for searching data from some tables in my PostgreSQL database. The query website consists of a simple textfield for entering the search term, the result website presents the results as a simple html table. The server side code for searching the PostgreSQL database and returning the results is written in python using psycopg2. Now I would like to add some interactive "Ajax features" to my search engine. When entering the search term I would like to be able to see a list of possible search terms like Google does it. On the results page, I would like to be able to sort the table showing the results. What would be the easiest/recommended way to implement these features for my search engine web site? Do I need a full-fledged web framework like Django for that?

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• Does Parallel.ForEach require AsParallel()

  - by dkackman

  ParallelEnumerable has a static member AsParallel. If I have an IEnumerable<T> and want to use Parallel.ForEach does that imply that I should always be using AsParallel? e.g. Are both of these correct (everything else being equal)? without AsParallel: List<string> list = new List<string>(); Parallel.ForEach<string>(GetFileList().Where(file => reader.Match(file)), f => list.Add(f)); or with AsParallel? List<string> list = new List<string>(); Parallel.ForEach<string>(GetFileList().Where(file => reader.Match(file)).AsParallel(), f => list.Add(f));

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• extract digg data by digg api

  - by vamsivanka

  I am trying to extract digg data for a user using this url "http://services.digg.com/user/vamsivanka/diggs?count=25&appkey=34asd56asdf789as87df65s4fas6" and the web response is throwing an error "The remote server returned an error: (403) Forbidden." Please let me know. public static XmlTextReader CreateWebRequest(string url) { HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(url); webRequest.UserAgent = ".NET Framework digg Test Client"; webRequest.Credentials = System.Net.CredentialCache.DefaultCredentials; webRequest.Accept = "text/xml"; HttpWebResponse webResponse = (HttpWebResponse)webRequest.GetResponse(); System.IO.Stream responseStream = webResponse.GetResponseStream(); XmlTextReader reader = new XmlTextReader(responseStream); return reader; }

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• Lazy loading of child throwing session error

  - by Thomas Buckley

  I'm the following error when calling purchaseService.updatePurchase(purchase) inside my TagController: SEVERE: Servlet.service() for servlet [PurchaseAPIServer] in context with path [/PurchaseAPIServer] threw exception [Request processing failed; nested exception is org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.app.model.Purchase.tags, no session or session was closed] with root cause org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.app.model.Purchase.tags, no session or session was closed at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:383) at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:375) at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:368) at org.hibernate.collection.PersistentSet.add(PersistentSet.java:212) at com.app.model.Purchase.addTags(Purchase.java:207) at com.app.controller.TagController.createAll(TagController.java:79) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:212) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:126) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:96) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:617) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:578) at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:900) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:827) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882) at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789) at javax.servlet.http.HttpServlet.service(HttpServlet.java:641) at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:999) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:565) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:309) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:662) TagController: @RequestMapping(value = "purchases/{purchaseId}/tags", method = RequestMethod.POST, params = "manyTags") @ResponseStatus(HttpStatus.CREATED) public void createAll(@PathVariable("purchaseId") final Long purchaseId, @RequestBody final Tag[] entities) { Purchase purchase = purchaseService.getById(purchaseId); Set<Tag> tags = new HashSet<Tag>(Arrays.asList(entities)); purchase.addTags(tags); purchaseService.updatePurchase(purchase); } Purchase: @Entity @XmlRootElement public class Purchase implements Serializable { /** * */ private static final long serialVersionUID = 6603477834338392140L; @Id @GeneratedValue(strategy = GenerationType.AUTO) private Long id; @OneToMany(mappedBy = "purchase", fetch = FetchType.LAZY, cascade={CascadeType.ALL}) private Set<Tag> tags; @JsonIgnore public Set<Tag> getTags() { if (tags == null) { tags = new LinkedHashSet<Tag>(); } return tags; } public void setTags(Set<Tag> tags) { this.tags = tags; } ... } Tag: @Entity @XmlRootElement public class Tag implements Serializable { /** * */ private static final long serialVersionUID = 5165922776051697002L; @Id @GeneratedValue(strategy = GenerationType.AUTO) private Long id; @ManyToOne(fetch = FetchType.LAZY) @JoinColumns({@JoinColumn(name = "PURCHASEID", referencedColumnName = "ID")}) private Purchase purchase; @JsonIgnore public Purchase getPurchase() { return purchase; } public void setPurchase(Purchase purchase) { this.purchase = purchase; } } PurchaseService: @Service public class PurchaseService implements IPurchaseService { @Autowired private IPurchaseDAO purchaseDAO; public PurchaseService() { } @Transactional public List<Purchase> getAll() { return purchaseDAO.findAll(); } @Transactional public Purchase getById(Long id) { return purchaseDAO.findOne(id); } @Transactional public void addPurchase(Purchase purchase) { purchaseDAO.save(purchase); } @Transactional public void updatePurchase(Purchase purchase) { purchaseDAO.update(purchase); } } TagService: @Service public class TagService implements ITagService { @Autowired private ITagDAO tagDAO; public TagService() { } @Transactional public List<Tag> getAll() { return tagDAO.findAll(); } @Transactional public Tag getById(Long id) { return tagDAO.findOne(id); } @Transactional public void addTag(Tag tag) { tagDAO.save(tag); } @Transactional public void updateTag(Tag tag) { tagDAO.update(tag); } } Any ideas on how I can fix this? (I want to avoid using EAGER loading). Do I need to setup some form of session management for transactions? Thanks

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• asp.net root paths

  - by dejavu

  I am getting the exception when trying to save a file: System.Web.HttpException: The SaveAs method is configured to require a rooted path, and the path '~/Thumbs/TestDoc2//small/ImageExtractStream.bmp' is not rooted. at System.Web.HttpPostedFile.SaveAs(String filename) at System.Web.HttpPostedFileWrapper.SaveAs(String filename) at PitchPortal.Core.Extensions.ThumbExtensions.SaveSmallThumb(Thumb image) in C:\Users\Bich Vu\Documents\Visual Studio 2008\Projects\PitchPortal\PitchPortal.Core\Extensions\ThumbExenstions.cs:line 23 the code is below: public static void SaveSmallThumb(this Thumb image) { var logger = Microsoft.Practices.ServiceLocation.ServiceLocator.Current.GetInstance<ILoggingService>(); string savedFileName = HttpContext.Current.Server.MapPath(Path.Combine( image.SmallThumbFolderPath, Path.GetFileName(image.PostedFile.FileName))); try { image.PostedFile.SaveAs(savedFileName); } catch (Exception ex) { logger.Log(ex.ToString()); } } I cant see what is wrong here, any tips?

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• AppDelegate viewController memory leak?

  - by fuzzygoat

  I am just curious with regards to the correct way to create a view controller programatically. When I compile this code with the static analyser I get a leak (as you would expect) from the alloc. Should I just leave it as it needs to stay until the app exits anyways, or is there a cleaner way? - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { NSLog(@"UIApplication application:"); RectViewController *myController = [[RectViewController alloc] init]; [window addSubview:[myController view]]; [window makeKeyAndVisible]; return YES; } cheers Gary

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• Memory problem with basic UITableView when scrolling

  - by Sheehan Alam

  I have a very simple UITableView that has 3 sections, and 3 rows per section. #pragma mark - #pragma mark UITableView delegate methods - (NSInteger)tableView:(UITableView *)tblView numberOfRowsInSection:(NSInteger)section { return 3; } - (UITableViewCell *)tableView:(UITableView *)tblView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tblView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease]; } // Configure the cell... return cell; } - (NSInteger)numberOfSectionsInTableView:(UITableView *)tblView { if (tblView == self.tableView) { return 3; } else { return 1; } } Everything shows up fine, but as soon as I scroll my application crashes and my debugger tells me: * -[ProfileViewController tableView:cellForRowAtIndexPath:]: message sent to deallocated instance 0x5ae61b0 I'm not exactly sure what I am doing wrong.

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• Items mixed up after scrolling in UITableView

  - by jean

  When I scroll in my UITableView, the cells become mixed up. What am I doing wrong? This is my method: - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease]; } [cell insertSubview:[itemArray objectAtIndex:indexPath.row] atIndex:indexPath.row]; return cell; } Update It now works by using cell.contentView, but now when I select an item, the selected one is overlayed with the content of a different cell...

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• Null Pointer Exception while using Java Compiler API

  - by java_geek

  MyClass.java: package test; public class MyClass { public void myMethod(){ System.out.println("My Method Called"); } } Listing for SimpleCompileTest.java that compiles the MyClass.java file. SimpleCompileTest.java: package test; import javax.tools.*; public class SimpleCompileTest { public static void main(String[] args) { String fileToCompile = "test" + java.io.File.separator +"MyClass.java"; JavaCompiler compiler = ToolProvider.getSystemJavaCompiler(); int compilationResult = compiler.run(null, null, null, fileToCompile); if(compilationResult == 0){ System.out.println("Compilation is successful"); }else{ System.out.println("Compilation Failed"); } } } I am executing the SimpleCompileTest class and getting a NullPointerException. The ToolProvider.getSystemJavaCompiler() is returning null. Can someone tell me what is wrong with the code

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• Patterns for simulating optional "out" parameters in C#?

  - by Jesse McGrew

  I'm translating an API from C to C#, and one of the functions allocates a number of related objects, some of which are optional. The C version accepts several pointer parameters which are used to return integer handles to the objects, and the caller can pass NULL for some of the pointers to avoid allocating those objects: void initialize(int *mainObjPtr, int *subObjPtr, int *anotherSubObjPtr); initialize(&mainObj, &subObj, NULL); For the C# version, the obvious translation would use out parameters instead of pointers: public static void Initialize(out int mainObj, out int subObj, out int anotherSubObj); ... but this leaves no way to indicate which objects are unwanted. Are there any well-known examples of C# APIs doing something similar that I could imitate? If not, any suggestions?

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• Rails: translations for table's column.

  - by Andrew

  In rails application I have two models: Food and Drink. Both food and drink have a name, which has to be stored in two languages. How do I better realize translations for theese tables? First solution I realized was to replace name column with name_en and name_ru. Another solution is to encode with YAML hash like { :en => 'eng', :ru => 'rus' } and store yaml as a name. What would you recommend, assuming content is not static? Maybe there's good article?

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• Should I use multiple ListViews?

  - by janfsd

  Hi to everybody! I have a RelativeLayout with different elements. I was planning to have two ListViews on it, but I have noticed there are some problems with scrolling. Since each ListView only shows a maximum of 5 rows should I try to make some kind of custom adapter to merge those ListViews? Or is it better to replace the ListView with a LinearLayout/RelativeLayout and add the rows as I get them manually? (like the first answer in here: http://stackoverflow.com/questions/1778485/android-listview-display-all-available-items-without-scroll-with-static-header ). Which should be the proper way on doing this? or is there another way? Also, each row will have an OnClickListener.

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• attaching linq to sql datacontext to httpcontext in business layer

  - by rap-uvic

  Hello all, I need my linq to sql datacontext to be available across my business/data layer for all my repository objects to access. However since this is a web app, I want to create and destroy it per request. I'm wondering if having a singleton class that can lazily create and attach the datacontext to current HttpContext would work. My question is: would the datacontext get disposed automatically when the request ends? Below is the code for what I'm thinking. Would this accomplish my purpose: have a thread-safe datacontext instance that is lazily available and is automatically disposed when the request ends? public class SingletonDC { public static NorthwindDataContext Default { get { NorthwindDataContext defaultInstance = (NorthwindDataContext)System.Web.HttpContext.Current.Items["datacontext"]; if (defaultInstance == null) { defaultInstance = new NorthwindDataContext(); System.Web.HttpContext.Current.Items.Add("datacontext", defaultInstance); } return defaultInstance; } } }

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• Build 2012, some thoughts..

  - by Dennis Vroegop

  I think you probably read my rant about the logistics at Build 2012, as posted here, so I am not going into that anymore. Instead, let’s look at the content. (BTW If you did read that post and want some more info then read Nia Angelina’s post about Build. I have nothing to add to that.) As usual, there were good speakers and some speakers who could benefit from some speaker training. I find it hard to understand why Microsoft allows certain people on stage, people who speak English with such strong accents it’s hard for people, especially from abroad, to understand. Some basic training might be useful for some of them. However, it is nice to see that most speakers are project managers, program managers or even devs on the teams that build the stuff they talk about: there was a lot of knowledge on stage! And that means when you ask questions you get very relevant information. I realize I am not the average audience member here, I am regular speaker myself so I tend to look for other things when I am in a room than most audience members so my opinion might differ from others. All in all the knowledge of the speakers was above average but the presentation skills were most of the times below what I would describe as adequate. But let us look at the contents. Since the official name of the conference is Build Windows 2012 it is not surprising most of the talks were focused on building Windows 8 apps. Next to that, there was a lot of focus on Azure and of course Windows Phone 8 that launched the day before Build started. Most sessions dealt with C# and JavaScript although I did see a tendency to use C++ more. Touch. Well, that was the focus on a lot of sessions, that goes without saying. Microsoft is really betting on Touch these days and being a Touch oriented developer I can only applaud this. The term NUI is getting a bit outdated but the principles behind it certainly aren’t. The sessions did cover quite a lot on how to make your applications easy to use and easy to understand. However, not all is touch nowadays; still the majority of people use keyboard and mouse to interact with their machines (or, as I do, use keyboard, mouse AND touch at the same time). Microsoft understands this and has spend some serious thoughts on this as well. It was all about making your apps run everywhere on all sorts of devices and in all sorts of scenarios. I have seen a couple of sessions focusing on the portable class library and on sharing code between Windows 8 and Windows Phone 8. You get the feeling Microsoft is enabling us devs to write software that will be ubiquitous. They want your stuff to be all over the place and they do anything they can to help. To achieve that goal they provide us with brilliant SDK’s, great tooling, a very, very good backend in the form of Windows Azure (I was particularly impressed by the Mobility part of Azure) and some fantastic hardware. And speaking of hardware: the partners such as Acer, Lenovo and Dell are making hardware that puts Apple to a shame nowadays. To illustrate: in Bellevue (very close to Redmond where Microsoft HQ is) they have the Microsoft Store located very close to the Apple Store, so it’s easy to compare devices. And I have to say: the Microsoft offerings are much, much more appealing that what the Cupertino guys have to offer. That was very visible by the number of people visiting the stores: even on the day that Apple launched the iPad Mini there were more people in the Microsoft store than in the Apple store. So, the future looks like it’s going to be fun. Great hardware (did I mention the Nokia Lumia 920? No? It’s brilliant), great software (Windows 8 is in a league of its own), the best dev tools (Visual Studio 2012 is still the champion here) and a fantastic backend (Azure.. need I say more?). It’s up to us devs to fill up the stores with applications that matches this. To summarize: it is great to be a Windows developer. PS. Did I mention Surface RT? Man….. People were drooling all over it wherever I went. It is fantastic :-) Technorati Tags: Build,Windows 8,Windows Phone,Lumia,Surface,Microsoft

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• Setting a "dependency property" in code

  - by Matt B

  I'm on a roll today... I have the following code delaring a dependency property inside a class called ActionScreen: #region Dependency Properties & Methods public string DescriptionHeader { get { return (string)GetValue(DescriptionHeaderProperty); } set { SetValue(DescriptionHeaderProperty, value); } } // Using a DependencyProperty as the backing store for DescriptionHeader. This enables animation, styling, binding, etc... public static readonly DependencyProperty DescriptionHeaderProperty = DependencyProperty.Register("DescriptionHeader", typeof(string), typeof(ActionScreen), new UIPropertyMetadata("xxx")); #endregion I bind to this property in my Xaml as so: <GridViewColumn DisplayMemberBinding="{Binding Description}" Header="{Binding DescriptionHeader}" Width="350" /> Now I want to be able to set the parameter from my code behind when I recieve an event - but it's not working: public string DescColText { set { this.Dispatcher.Invoke(DispatcherPriority.Normal, new Action(delegate() { DescriptionHeader = value; })); } }

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• Generate dynamic html

  - by Fred

  Hi all, to export some data i want to be able to generate an html output. I have some constant content to output, like html headers and footers. My question is how to deal with that ? Do I have to embed some template (in a ressource file) and parse it to make it dynamic ? Do I store my static content in some constant (is there a 255 char limit?) and append them while generating the dynamic content ? Do you have some hints, useful links, or best practices to share? Thanks

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• Ogg/Vorbis: _ov_fopen cannot be found

  - by knight666

  I'm trying to use Ogg/Vorbis with OpenAL to get sound in my game. Right now I'm simply trying to load a .ogg file and read its data, I'm not actually doing anything with it. I first tried using ov_open, however, the documentation said I should really be using ov_fopen on Windows. However, when I try to use that I get the following: 1>AudioManager.obj : error LNK2019: unresolved external symbol _ov_fopen referenced in function "private: static struct SomeGame::SoundData * __cdecl SomeGame::AudioManager::LoadOGG(char *)" (?LoadOGG@AudioManager@SomeGame@@CAPAUSoundData@2@PAD@Z) ...and when I Google "unresolved external symbol _ov_fopen", I get exactly one result. And it's in Japanese. So I tried downloading the ogg and vorbis source and compiling it, and inserting those in the project, but it still gives me the same error. Basically, how do I load in an Ogg/Vorbis file to be used with OpenAL on Windows? Thanks in advance.

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• JFreeChart Legend Display

  - by Richard B

  In my JFreeChart timeseries plots I find the legends lines to thin to see the colour accurately. Another post [ jfreechart - change sample of colors in legend ] suggested overriding a renderer method as follows: renderer = new XYLineAndShapeRenderer() { private static final long serialVersionUID = 1L; public Shape lookupLegendShape(int series) { return new Rectangle(15, 15); } }; this approach works fine until you do what I did renderer.setSeriesShapesVisible(i, false); Once I did that the legend reverts back to a line. Is there any way round this?

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• Basic WCF Unit Testing

  - by Brian

  Coming from someone who loves the KISS method, I was surprised to find that I was making something entirely too complicated. I know, shocker right? Now I'm no unit testing ninja, and not really a WCF ninja either, but had a desire to test service calls without a) going to a database, or b) making sure that the entire WCF infrastructure was tip top. Who does? It's not the environment I want to test, just the logic I’ve written to ensure there aren't any side effects. So, for the K.I.S.S. method: Assuming that you're using a WCF service library (you are using service libraries correct?), it's really as easy as referencing the service library, then building out some stubs for bunking up data. The service contract We’ll use a very basic service contract, just for getting and updating an entity. I’ve used the default “CompositeType” that is in the template, handy only for examples like this. I’ve added an Id property and overridden ToString and Equals. [ServiceContract] public interface IMyService { [OperationContract] CompositeType GetCompositeType(int id); [OperationContract] CompositeType SaveCompositeType(CompositeType item); [OperationContract] CompositeTypeCollection GetAllCompositeTypes(); } The implementation When I implement the service, I want to be able to send known data into it so I don’t have to fuss around with database access or the like. To do this, I first have to create an interface for my data access: public interface IMyServiceDataManager { CompositeType GetCompositeType(int id); CompositeType SaveCompositeType(CompositeType item); CompositeTypeCollection GetAllCompositeTypes(); } For the purposes of this we can ignore our implementation of the IMyServiceDataManager interface inside of the service. Pretend it uses LINQ to Entities to map its data, or maybe it goes old school and uses EntLib to talk to SQL. Maybe it talks to a tape spool on a mainframe on the third floor. It really doesn’t matter. That’s the point. So here’s what our service looks like in its most basic form: public CompositeType GetCompositeType(int id) { //sanity checks if (id == 0) throw new ArgumentException("id cannot be zero."); return _dataManager.GetCompositeType(id); } public CompositeType SaveCompositeType(CompositeType item) { return _dataManager.SaveCompositeType(item); } public CompositeTypeCollection GetAllCompositeTypes() { return _dataManager.GetAllCompositeTypes(); } But what about the datamanager? The constructor takes care of that. I don’t want to expose any testing ability in release (or the ability for someone to swap out my datamanager) so this is what we get: IMyServiceDataManager _dataManager; public MyService() { _dataManager = new MyServiceDataManager(); } #if DEBUG public MyService(IMyServiceDataManager dataManager) { _dataManager = dataManager; } #endif The Stub Now it’s time for the rubber to meet the road… Like most guys that ever talk about unit testing here’s a sample that is painting in *very* broad strokes. The important part however is that within the test project, I’ve created a bunk (unit testing purists would say stub I believe) object that implements my IMyServiceDataManager so that I can deal with known data. Here it is: internal class FakeMyServiceDataManager : IMyServiceDataManager { internal FakeMyServiceDataManager() { Collection = new CompositeTypeCollection(); Collection.AddRange(new CompositeTypeCollection { new CompositeType { Id = 1, BoolValue = true, StringValue = "foo 1", }, new CompositeType { Id = 2, BoolValue = false, StringValue = "foo 2", }, new CompositeType { Id = 3, BoolValue = true, StringValue = "foo 3", }, }); } CompositeTypeCollection Collection { get; set; } #region IMyServiceDataManager Members public CompositeType GetCompositeType(int id) { if (id <= 0) return null; return Collection.SingleOrDefault(m => m.Id == id); } public CompositeType SaveCompositeType(CompositeType item) { var existing = Collection.SingleOrDefault(m => m.Id == item.Id); if (null != existing) { Collection.Remove(existing); } if (item.Id == 0) { item.Id = Collection.Count > 0 ? Collection.Max(m => m.Id) + 1 : 1; } Collection.Add(item); return item; } public CompositeTypeCollection GetAllCompositeTypes() { return Collection; } #endregion } So it’s tough to see in this example why any of this is necessary, but in a real world application you would/should/could be applying much more logic within your service implementation. This all serves to ensure that between refactorings etc, that it doesn’t send sparking cogs all about or let the blue smoke out. Here’s a simple test that brings it all home, remember, broad strokes: [TestMethod] public void MyService_GetCompositeType_ExpectedValues() { FakeMyServiceDataManager fake = new FakeMyServiceDataManager(); MyService service = new MyService(fake); CompositeType expected = fake.GetCompositeType(1); CompositeType actual = service.GetCompositeType(2); Assert.AreEqual<CompositeType>(expected, actual, "Objects are not equal. Expected: {0}; Actual: {1};", expected, actual); } Summary That’s really all there is to it. You could use software x or framework y to do the exact same thing, but in my case I just didn’t really feel like it. This speaks volumes to my not yet ninja unit testing prowess.

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• How to convert culture specific double using TypeConverter?

  - by Christian

  Hi I have a problem with the TypeConverter class. It works fine with CultureInvariant values but cannot convert specific cultures like english 1000 seperators. Below is a small test program that I cannot get to work. using System; using System.Globalization; using System.ComponentModel; namespace TestConvertCulture { class Program { static void Main() { try { var culture = new CultureInfo( "en" ); TypeConverter typeConverter = TypeDescriptor.GetConverter( typeof ( double ) ); double value = (double)typeConverter.ConvertFromString( null, culture, "2,999.95" ); Console.WriteLine( "Value: " + value ); } catch( Exception e ) { Console.WriteLine( "Error: " + e.Message ); } } } }

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• error - convert date to showing in view

  - by Ali

  hi i need convert date to shamsi date i create a method that convert DateTime to shamsi Date. when i passing a date to the method i got this error The best overloaded method match for 'BentaAccounting.Classes.GenralClasses.FarsiDate.MiladiToShamsi(System.DateTime)' has some invalid arguments this is the code i am using the method public static string MiladiToShamsi(DateTime Date) { string Result; PersianCalendar FarsiDate = new PersianCalendar(); Result = FarsiDate.GetYear(Date).ToString() + "/" + (FarsiDate.GetMonth(Date) < 10 ? "0" + FarsiDate.GetMonth(Date).ToString() : FarsiDate.GetMonth(Date).ToString()) + "/" + (FarsiDate.GetDayOfMonth(Date) < 10 ? "0" + FarsiDate.GetDayOfMonth(Date).ToString() : FarsiDate.GetDayOfMonth(Date).ToString()); return Result; } and view <%: Html.Encode(GenralClasses.FarsiDate.MiladiToShamsi(item.OrderDate) )%>

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• Javascript issue on IE

  - by vinu-arumugam

  I have added the social links in my html page. When I added, the top nav of my pages is gone. Tats appeared in firefox but not in IE. Any one help me how can i resolve tis? Here is the code i used. <a class="addthis_button" href="http://www.addthis.com/bookmark.php?v=250&username=xa-4b9a190d10b004d6"><img src="http://s7.addthis.com/static/btn/v2/lg-share-en.gif" width="125" height="16" alt="Bookmark and Share" style="border:0"/></a><script type="text/javascript" src="http://s7.addthis.com/js/250/addthis_widget.js#username=xa-4b9a190d10b004d6"></script>

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