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• Showing/Hiding the main form in C#

  - by DazSlayer

  I am working on a program where clicking on a button on form1 will open form2. I will then hide form1 until form2 is closed. The problem I have is that I cannot get form1 to show after form2 closes. Any ideas on how to fix this? try { Form1.ActiveForm.Hide(); AddGradeForm = new Form2(Form.NumberOfSelections); AddGradeForm.ShowDialog(); MessageBox.Show(AddGradeForm.Result.ToString()); } catch (Exception i) { Form1.ActiveForm.Hide(); AddGradeForm.Dispose(); AddGradeForm = new Form2(Form.NumberOfSelections); AddGradeForm.ShowDialog(); MessageBox.Show(AddGradeForm.Result.ToString()); } Form1.ActiveForm.Show(); ERROR: NullReferenceException was unhanded. Object reference not set to an instance of an object.

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• Will lock() statement block all threads in the proccess/appdomain?

  - by MikeJ

  Maybe the question sounds silly, but I don't understand 'something about threads and locking and I would like to get a confirmation (here's why I ask). So, if I have 10 servers and 10 request in the same time come to each server, that's 100 request across the farm. Without locking, thats 100 request to the database. If I do something like this: private static readonly object myLockHolder = new object(); if (Cache[key] == null) { lock(myLockHolder) { if (Cache[key] == null) { Cache[key] = LengthyDatabaseCall(); } } } How many database requests will I do? 10? 100? Or as much as I have threads?

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• Flex Filterfunction - Filter by Array of values

  - by Anandh

  How to filter an Arraycollection by "array of values" rather than a single value (simple comparision) , the below code snippet is for filtering by single value now I went into scenario like filter out only price [10,4,1,8] (some random values from the master collection). Is there any better way to do the second code snippet Filter function simple comparision private function filterForTestData(item:Object):Boolean{ if(item.price < slider.value) return true; else return false; } Filter by array of values private function filterForTestData(item:Object,filterBy:Array= [10,4,1,8]):Boolean{ for(randomprice in filterBy) return item.price == randomprice; } [Edited] Apply Filter testData.filterFunction = filterForTestData;

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• Writing jQuery functions that allow chaining.

  - by Rich Bradshaw

  I want to write some code that allows me to replace jQuery's animate function with one that does different things, but still allows me to call a secondary function on completion. At the moment, I'm writing lots of code like this; if (cssTransitions) { $("#content_box").css("height",0); window.setTimeout(function() { secondFunction(); }, 600); } else { $("#content_box").animate({ height:0 }, 600, function() { secondFunction(); }); } I'd much rather write a function that looks like this: function slideUpContent(object) { if (cssTransitions) { object.css("height",0); // Not sure how I get a callback here } else { $("#content_box").animate({ height:0 }, 600, function() { }); } } That I could use like this: slideUpContent("#content_box", function(){ secondFunction(); }); But I'm not sure how to get the functionality I need - namely a way to run another function once my one has completed. Can anyone help my rather addled brain?

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• Questions Regarding Handling of Received SMS

  - by Edwin

  Hi, i have managed to successfully write a little test app that can receive and send SMS, but got a couple of questions. (That's 'cos part of the code i copied from elsewhere and i would like to understand better). In my AndroidManifest as well as the sub-class of BroadcastReceiver, there is reference to the string literal "android.provider.Telephony.SMS_RECEIVED". However, i couldn't find any reference in the API that mentions this. Could someone point me to some reference that lists/explains these? As part of getting the message from the Intent, i did this: Object[] pdus = (Object[]) intent.getExtras().get("pdus"); Again this question is related to the use of hardcoded string literal. Where is the string "pdus" listed and described? Thanks in advance!

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• how to select specific number of child entities instead of all in entity framework 3.5?

  - by Sasha

  Hi all, i am wondering how can i select specific number of child objects instead of taking them all with include? lets say i have object 'Group' and i need to select last ten students that joined the group. When i use '.Include("Students"), EF includes all students. I was trying to use Take(10), but i am pretty new to EF and programming as well, so i couldn't figure it out. Any suggestions? UPDATED: ok, i have Group object already retrieved from db like this: Group group = db.Groups.FirstOrDefault(x=>x.GroupId == id) I know that i can add Include("Students") statement, but that would bring ALL students, and their number could be quite big whether i need only freshest 10 students. Can i do something like this: var groupWithStudents = group.Students.OrderByDescending(//...).Take(10);? The problem with this is that Take< no longer appears in intellisense. Is this clear enough? Thanks for responses

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• drupal + i18n - how to send the currently selected locale to javascript?

  - by egarcia

  I've got a multi-lingual Drupal 6 installation. The multi-language is provided by the i18n module. I'm displaying some date pickers using jquery ui's datepicker. I'd like to localize those datepickers too (so when the page being shown is English, they show 'mon tue wed ...' but when the page is in Spanish they show 'lun mar mi ...'). My problem is: I don't know how to send the currently selected locale to javascript. The closest thing I could find was the javascript Drupal.locale object. However that object doesn't seem to have a 'locale name'.

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• Dynamic proxies to auto-save models

  - by atomman

  I'm trying to make some auto-magic happen in java using proxies to track objects and saving them when a set* method is called. I started of using java's built in Proxy, and everything works just fine, but from what I can understand I need a interface for every model, which is something that I'm trying to avoid. This is where CGLIB comes in, it allows me to create proxies of my models without the use of interfaces. BUT, how can I now retrieve the original object, the one I am trying to save? The optimal solution to be would be something like the EntityManager interface used by hibernate, where you keep your original object, but it is still tracked.

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• Rails: Generic form actions, cancel link losing `:back` on validation failure

  - by Patrick Connor

  I am trying to create a generic set of Submit, Cancel, and Destroy actions for forms. At this point, it appears that everything is working, except that I lose :back functionality then a form reloads due to validation errors. Is there a way to catch the fact that validation has failed, and in that case, keep the request.env['HTTP_REFERER'] or :back value the same without having to edit every controller? = simple_form_for @announcement do |f| = f.error_notification = f.input :message = f.input :starts_at = f.input :ends_at #submit = f.button :submit = "or " = link_to("cancel", url_for(:back)) .right - if !f.object.new_record? - resource = (f.object.class.name).downcase = link_to "destroy", url_for(:action => 'destroy'), :confirm => "Are you sure that you want to delete this #{resource}?", :method => :delete .clear .non_input #post_back_msg #indicator.inline = image_tag "indicator.gif" .inline = "Please wait..." .non_input

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• Is there an ORM that allows a "plugin" to extend the database?

  - by IP

  So, I've been searching for the answer to this, but I can't find anything I have an Entity Framework Model (MyModel1) - for now, we'll say this contains a "Users" table It's part of a big app, that has a references to an "Addresses" project The addresses project contains an Entity Framework Model (MyModel2), this contains a Users table, and an Addresses table (pointing to the same database. The main app has a control that edits the user, and in that control it has an "addresses" control which actually exists in the "Addresses" project. To make this work, the User control passes the User object down to the addresses control, however, as the User that's been passed belongs to MyModel1 and not MyModel2, another User object has to be loaded up, then it can be used. This isn't ideal as I've had to load up the User twice. Is there a way of say, MyModel2 extending MyModel1, which effectively just adds a relationship to "User". Or is there an ORM that would handle this better? Or even a design pattern that would handle this better?

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• Setting location based on previous parameter of $routeChangeError with AngularJS

  - by Moo

  I'm listening on events of the type $routeChangeError in a run block of my application. $rootScope.$on("$routeChangeError", function (event, current, previous, rejection) { if (!!previous) { console.log(previous); $location.path(previous.$$route.originalPath); } }); With the help of the previous parameter I would like to set the location to the previous page. This works as long as the "originalPath" of "previous.$$route" does not contain any parameters. If it contains parameters the "originalPath" is not transformed. Logging the previous objects returns the following output: $$route: Object ... originalPath: "/users/:id" regexp: /^\/users\/(?:([^\/]+)?)$/ ... params: Object id: "3" How can I set the location to the previous path including the parameters?

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• MEF + Plug-In not updating

  - by mybrokengnome

  I asked this on the MEF Codeplex forum already, but I haven't gotten a response yet, so I figured I'd try StackOverflow. Here's the original post if anyone's interested (this is just a copy from it): MEF Codeplex "Let me first say that I'm completely new to MEF (just discovered it today) and am very happy with it so far. However, I've ran in to a problem that is very frustrating. I'm creating an app that will have a plugin architecture and the plugins will only be stored in a single DLL file (or coded into the main app). The DLL file needs to be able to be recompiled during run-time and the app should recognize this and re-load the plugins (I know this is difficult, but it's a requirement). To accomplish this I took the approach covered http://blog.maartenballiauw.be/category/MEF.aspx there (look for WebServerDirectoryCatalog). Basically the idea is to "monitor the plugins folder, copy the new/modified assemblies to the web application’s /bin folder and instruct MEF to load its exports from there." This is my code, which is probably not the correct way to do it but it's what I found in some samples around the net: main()... string myExecName = Assembly.GetExecutingAssembly().Location; string myPath = System.IO.Path.GetDirectoryName(myExecName); catalog = new AggregateCatalog(); pluginCatalog = new MyDirectoryCatalog(myPath + @"/Plugins"); catalog.Catalogs.Add(pluginCatalog); exportContainer = new CompositionContainer(catalog); CompositionBatch compBatch = new CompositionBatch(); compBatch.AddPart(this); compBatch.AddPart(catalog); exportContainer.Compose(compBatch); and private FileSystemWatcher fileSystemWatcher; public DirectoryCatalog directoryCatalog; private string path; private string extension; public MyDirectoryCatalog(string path) { Initialize(path, "*.dll", "*.dll"); } private void Initialize(string path, string extension, string modulePattern) { this.path = path; this.extension = extension; fileSystemWatcher = new FileSystemWatcher(path, modulePattern); fileSystemWatcher.Changed += new FileSystemEventHandler(fileSystemWatcher_Changed); fileSystemWatcher.Created += new FileSystemEventHandler(fileSystemWatcher_Created); fileSystemWatcher.Deleted += new FileSystemEventHandler(fileSystemWatcher_Deleted); fileSystemWatcher.Renamed += new RenamedEventHandler(fileSystemWatcher_Renamed); fileSystemWatcher.IncludeSubdirectories = false; fileSystemWatcher.EnableRaisingEvents = true; Refresh(); } void fileSystemWatcher_Renamed(object sender, RenamedEventArgs e) { RemoveFromBin(e.OldName); Refresh(); } void fileSystemWatcher_Deleted(object sender, FileSystemEventArgs e) { RemoveFromBin(e.Name); Refresh(); } void fileSystemWatcher_Created(object sender, FileSystemEventArgs e) { Refresh(); } void fileSystemWatcher_Changed(object sender, FileSystemEventArgs e) { Refresh(); } private void Refresh() { // Determine /bin path string binPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Plugins"); string newPath = ""; // Copy files to /bin foreach (string file in Directory.GetFiles(path, extension, SearchOption.TopDirectoryOnly)) { try { DirectoryInfo dInfo = new DirectoryInfo(binPath); DirectoryInfo[] dirs = dInfo.GetDirectories(); int count = dirs.Count() + 1; newPath = binPath + "/" + count; DirectoryInfo dInfo2 = new DirectoryInfo(newPath); if (!dInfo2.Exists) dInfo2.Create(); File.Copy(file, System.IO.Path.Combine(newPath, System.IO.Path.GetFileName(file)), true); } catch { // Not that big deal... Blog readers will probably kill me for this bit of code :-) } } // Create new directory catalog directoryCatalog = new DirectoryCatalog(newPath, extension); directoryCatalog.Refresh(); } public override IQueryable<ComposablePartDefinition> Parts { get { return directoryCatalog.Parts; } } private void RemoveFromBin(string name) { string binPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, ""); File.Delete(Path.Combine(binPath, name)); } So all this actually works, and after the end of the code in main my IEnumerable variable is actually filled with all the plugins in the DLL (which if you follow the code is located in Plugins/1 so that I can modify the dll in the plugins folder). So now at this point I should be able to re-compile the plugins DLL, drop it in to the Plugins folder, my FileWatcher detect that it's changed, and then copy it into folder "2" and directoryCatalog should point to the new folder. All this actually works! The problem is, even though it seems like every thing is pointed to the right place, my IEnumerable variable is never updated with the new plugins. So close, but yet so far! Any suggestions? I know the downsides of doing it this way, that no dll is actually getting unloaded and causing a memory leak, but it's a Windows App and will probably be started at least once a day, and the plugins are un-likely to change that often, but it's still a requirement from the client that it does this without re-loading the app. Thanks! Thanks for any help you all can provide, it's driving me crazy not being able to figure this out."

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• Django & custom auth backend (web service) + no database. How to save stuff in session?

  - by Infinity

  I've been searching here and there, and based on this answer I've put together what you see below. It works, but I need to put some stuff in the user's session, right there inside authenticate. How would I store acme_token in the user's session, so that it will get cleared if they logged out? class AcmeUserBackend(object): # Create a User object if not already in the database? create_unknown_user = False def get_user(self, username): return AcmeUser(id=username) def authenticate(self, username=None, password=None): """ Check the username/password and return an AcmeUser. """ acme_token = ask_another_site_about_creds(username, password) if acme_token: return AcmeUser(id=username) return None ################## from django.contrib.auth.models import User class AcmeUser(User): objects = None # we cannot really use this w/o local DB def save(self): """saving to DB disabled""" pass def get_group_permissions(self): """If you don't make your own permissions module, the default also will use the DB. Throw it away""" return [] # likewise with the other permission defs def get_and_delete_messages(self): """Messages are stored in the DB. Darn!""" return []

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• Confusion between JPA and Hibernate cascading

  - by Jay

  I'm using Hibernate 3.6 and have my code annotated (versus using hibernate mapping files). I ran into the known "problem" of using JPA cascading options that are not compatible with Hibernate's CascadeType (see this link for more info http://www.mkyong.com/hibernate/cascade-jpa-hibernate-annotation-common-mistake/). I was hoping to get a bit more clarification on the problem. I have some particular questions: 1) So @Cascade({CascadeType.SAVE_UPDATE}) works for saveOrUpdate(), but does it apply also if I use merge() or persist()? or do I have to use all three Hibernate CascadeTypes? 2) How do I decide whether to use JPA cascade options or the Hibernate @Cascade annotation instead? 2) There is a "bug" filed against this in Hibernate, but the developers apparently see this as a documentation issue, (I'm completely disagree with them), and I'm not seeing that it was addressed in said documentation. Anyone know why this is "working as designed" and not a bug in Hibernate's JPA implementation? Many thanks in advance.

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• What's the most simple way to retrieve all data from a table and save it back in .NET 3.5?

  - by zoman

  I have a number of tables containing some basic (business related) mapping data. What's the most simple way to load the data from those tables, then save the modified values back. (all data should be replaced in the tables) An ORM is out of question as I would like to avoid creating domain objects for each table. The actual editing of the data is not an issue. (it is exported into Excel where the data is edited, then the file is uploaded with the modified data) The technology is .NET 3.5 (ASP.NET MVC) and SQL Server 2005. Thanks.

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• PHP class referencing confusion across multiple files

  - by DssTrainer

  I have an index.php file that has 3 includes <?php require_once('mod.php'); $mod = new Mod(); require_once('start.php'); require_once('tools.php'); ....some code.... ?> I need to be able to reference the $mod object inside the start.php and tools.php. How do I pass that object to be referenced by those 2 other require files? Basically the mod.php is a class that has an array list generated in its __construct(). I want to use that array list data inside the startup.php and tools.php file but not sure how to pass in the existing one without calling "new" inside both of those files separately which doesn't do what I need since it resets everything. Thanks!

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• Alternative to singleton for unique resources

  - by user1320881

  I keep reading over and over again that one should avoid using singletons for various reasons. I'm wondering how to correctly handle a situation where a class represents a unique system resource. For example, a AudioOutput class using SDL. Since SDL_OpenAudio can only be open once at a time it makes no sense having more then one object of this type and it seems to me preventing accidentally making more then one object would actually be good. Just wondering what experienced programmers think about this, am i missing another option ?

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• Adding index key in Grails' Domain

  - by firnnauriel

  I tried following this reference and this is now my domain's code: class SnbrActVector { long nid String term double weight static mapping = { version false nid index:'Nid_Idx' } static constraints = { term(blank:false) } } What I want is to do is to add an index key for 'nid' column. I dropped the existing table and run the app again so the table is then recreated. However, when i check for list of indices, I can't see a 'Nid_Idx', only available is 'PRIMARY'. Do I have to manually create the index and name it 'Nid_idx in my mysql database? Thanks.

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• What is the most "database independent" way of creating a variable length text field in a database

  - by Thibaut Colar

  I want to create a text field in the database, with no specific size (it will store text of length unknown in some case) - the particular text are serialized simple object (~ JSON) What is the most database independent way to do this : - a varchar with no size specified (don't think all db support this) - a 'text' field, this seems to be common, but I don't believe it's a standard - a blob or other object of that kind ? - a varchar of a a very large size (that's inefficient and wastes disk space probably) - Other ? I'm using JDBC, but I'd like to use something that is supported in most DB (oracle, mysql, postgresql, derby, HSQL, H2 etc...) Thanks.

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• Swf files not loaed on IE

  - by Rajeev

  The swf files are not loaded on IE.IS there any settings that needs to be changed on IE <div> <table style="table-layout:fixed;width:100%;"> <tr> <td width="20%"> <object width="100" height="100" id="microphone"> <embed src="/media/players/game.swf" width="250" height="250" type='application/x-shockwave-flash'> </embed> </object> </td> </tr> </table> </div>

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• How to port C# code which uses a callback to VB.NET?

  - by Bob

  I need to port the following from the ASP.NET MVC 2 sourcecode from C# to VB.NET. It's from AuthorizeAttribute.cs beginning on line 86: HttpCachePolicyBase cachePolicy = filterContext.HttpContext.Response.Cache; cachePolicy.SetProxyMaxAge(new TimeSpan(0)); cachePolicy.AddValidationCallback(CacheValidateHandler, null /* data */); where CacheValidateHandler is: private void CacheValidateHandler(HttpContext context, object data, ref HttpValidationStatus validationStatus) { validationStatus = OnCacheAuthorization(new HttpContextWrapper(context)); } The VB.NET port from http://converter.telerik.com doesn't quite work for this line: cachePolicy.AddValidationCallback(CacheValidateHandler, Nothing) ' Error where CacheValidateHandler is: Private Sub CacheValidateHandler(ByVal context As HttpContext, ByVal data As Object, _ ByRef validationStatus As HttpValidationStatus) validationStatus = OnCacheAuthorization(New HttpContextWrapper(context)) End Sub VS2008 complains that CacheValidateHandler does not specify its arguments for context, data, and validationStatus. Any ideas how to port this code?

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• Asp.Net - Can a LinkButton.CommandArgument be typed?

  - by Stimul8d

  Okay so given a LinkButton inside a the ItemTemplate of a Repeater declared like this - <asp:LinkButton ID="restrictionDelete" runat="server" CssClass="restrictionDelete" Text="Delete..." OnCommand="lnkDeleteRestriction_Command" CommandName="Delete" CommandArgument="<%# Container.DataItem %>"></asp:LinkButton> Now,..the repeater is being bound to a list of Restriction objects so when the lnkDeleteRestriction_Command is fired I'm expecting that I can cast the CommandEventArgs.CommandArgument which is an object to my Restriction type. This doesn't seem to be so,..I just get the fully qualified type name as a string. Can I receive a typed command argument at all and if not, why is it an object? Thanks in advance,

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• Hibernate - Persisting polymorphic joins

  - by Marty Pitt

  Hi I'm trying to understand how to best implement a polymorphic one-to-many in hibernate. Eg: @MappedSuperclass public class BaseEntity { Integer id; // etc... } @Entity public class Author extends BaseEntity {} @Entity public class Post extends BaseEntity {} @Entity public class Comment extends BaseEntity {} And now, I'd like to also persist audit information, with the following class: @Entity public class AuditEvent { @ManyToOne // ? BaseEntity entity; } What is the appropriate mapping for auditEvent.entity? Also, how will Hibernate actually persist this? Would a series of join tables be generated (AuditEvent_Author , AuditEvent_Post, AuditEvent_Comment), or is there a better way? Note, I'd rather not have my other entity classes expose the other side of the join (eg., List<AuditEvent> events on BaseEntity) - but if that's the cleanest way to implement, then it will suffice.

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• How to instantiate a Singleton multiple times?

  - by Sebi

  I need a singleton in my code. I implemented it in Java and it works well. The reason I did it, is to ensure that in a mulitple environment, there is only one instance of this class. But now I want to test my Singleton object locally with a Unit test. For this reason I need to simulate another instance of this Singleton (the object that would be from another device). So is there a possiblity to instantiate a Singleton a second time for testing purpose or do I have to mock it? I'm not sure, but I think it could be possible by using a different class loader?

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• PropertyInfo.GetValue() - how do you index into a generic parameter using reflection in C#?

  - by flesh

  This (shortened) code.. for (int i = 0; i < count; i++) { object obj = propertyInfo.GetValue(Tcurrent, new object[] { i }); } .. is throwing a 'TargetParameterCountException : Parameter count mismatch' exception. The underlying type of 'propertyInfo' is a Collection of some T. 'count' is the number of items in the collection. I need to iterate through the collection and perform an operation on obj. Advice appreciated.

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