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• WPF, Image MouseDown Event

  - by PrimeTSS

  I have an control with a mouse down event where Id like to chnage the Image when the image is clicked. But I cant seem to alter ANY of the images properties in the event. Event private void Image_MouseDown(object sender, MouseButtonEventArgs e) { BitmapImage bitImg = new BitmapImage(); bitImg.BeginInit(); bitImg.UriSource = new Uri("./Resource/Images/Bar1.png", UriKind.Relative); bitImg.EndInit(); ((Image)sender).Source = null; ((Image)sender).Width = 100; ((Image)sender).Visibility = Visibility.Hidden; } The event does fire, and even the .Visibility property does not alter the image and make it hidden. What am I doing wrong?

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• WinForms equivalent of performSelectorOnMainThread in Objective-C

  - by jamone

  I haven't done much multithreading before and now find the need to do some background work and keep the UI responsive. I have the following code. data.ImportProgressChanged += new DataAccess.ImportDelegate(data_ImportProgressChanged); Thread importThread = new Thread( new ThreadStart(data.ImportPeopleFromFAD)); importThread.IsBackground = true; importThread.Start(); void data_ImportProgressChanged(int progress) { toolStripProgressBar.Value = progress; } //In my data object I have public void ImportPeopleFromFAD() { ImportProgressChanged(someInt); } But the UI doesn't get updated since the ImportProgressChanged() call is made on the background thread. In objective C I know you can use performSelectorOnMainThread and pass it a method to call using the main thread. What is the equivalent way of calling ImportProgressChanged() from the main thread?

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• How do I invoke my custom settings provider?

  - by joebeazelman

  I need to specify a different location for my settings file. After many long hours of searching, I found out that I have to write my own SettingsProvider. I succeeded in creating one which allows me to specify a path for settings file via its constructor. Programatically, I can contruct it like this: var mycustomprovider = new CustomSettingsProvider(path); The problem I am having is that there's no way to invoke my custom provider. I can decorate the VS 2008 generated setting file with the following attribute: [SettingsProvider(typeof(CustomSettingProviders.CustomSettingsProvider))] internal sealed partial class Settings { } However, the attribute doesn't allow me to construct the object with a path. Also, I want to be able to set the SettingsProvider programmatically so that I can pass in any path I want at runtime and save my settings. The examples I've seen on the net have never mentioned how to use a invoke a SettingsProvider programmatically.

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• how to get linkbutton id that is genrated dynamically from code behind in the eventhandler

  - by Ranjana

  i have create two linkbuttons dynamically: for (int i = 0; i < 2; i++) { LinkButton lb = new LinkButton(); lb.ID = "lnk" + FileName; lb.Text = FileName; Session["file"] = FileName; lb.CommandArgument = FileName; lb.Click += new EventHandler(Lb_Click); Panel1.Controls.Add(lb); Panel1.Controls.Add(new LiteralControl("<br />")); } i have got two links namely: File11 File22 void Lb_Click(object sender, EventArgs e) { string id=lb.ID; i.e //--Here how to get link button id which is clicked (either File11 id or File22 id)-------------------- }

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• C# .NET 4.0 and Generics

  - by Mr Snuffle

  I was wondering if anyone could tell me if this kind of behaviour is possible in C# 4.0 I have an object hierarchy I'd like to keep strongly typed. Something like this class ItemBase {} class ItemType<T> where T : ItemBase { T Base { get; set; } } class EquipmentBase : ItemBase {} class EquipmentType : ItemType<EquipmentBase> {} What I want to be able to do to have something like this ItemType item = new EquipmentType(); And I want item.Base to return type ItemBase. Basically I want to know if it's smart enough to strongly typed generic to a base class without the strong typing. Benefit of this being I can simply cast an ItemType back to an EquipmentType and get all the strongly typedness again. I may be thinking about this all wrong...

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• How to stop NpgsqlDataReader from blocking?

  - by Swingline Rage

  Running the following code against a large PostgreSQL table, the NpgsqlDataReader object blocks until all data is fetched. NpgsqlCommand cmd = new NpgsqlCommand(strQuery, _conn); NpgsqlDataReader reader = cmd.ExecuteReader(); // <-- takes 30 seconds How can I get it to behave such that it doesn't prefetch all the data? I want to step through the resultset row by row without having it fetch all 15 GB into memory at once. I know there were issues with this sort of thing in Npgsql 1.x but I'm on 2.0. This is against a PostgreSQL 8.3 database on XP/Vista/7. I also don't have any funky "force Npgsql to prefetch" stuff in my connection string. I'm at a complete loss for why this is happening.

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• Setting a session variable in Global.asax causes AJAX errors

  - by Fly_Trap

  I'm getting a very peculiar problem with my asp.net application, it took me an age to track down but I still don't know what is causing this behaviour. If I set a session variable in the Application_PreRequestHandlerExecute event, then my external JavaScript files are ignored, and therfore causing a raft of errors. I have simplified the problem below. E.g. I have file called JScript.js containing the code: function myAlert() { alert("Hi World"); } And in my Default.aspx file I reference the js with the code: <script src="JScript.js" type="text/javascript"></script> And in the body onload event I call the myAlert() function: <body onload="myAlert()"> And finally in the Global.asax file: Private Sub Application_PreRequestHandlerExecute(ByVal sender As Object, ByVal e As EventArgs) HttpContext.Current.Session("myVar") = "MyValue" End Sub If you run the Default.aspx file you will see the js function isnt called, however, if you comment out the line of code Global.asax then the external js is called and the function executed when the page loads. Why is this?

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• take out objects from randomizer obj c

  - by David Pollak

  hello everyone, I'm a new "developer" trying to build some iPhone app I'm making an app which gets text from a list of objects in a NSArray and then randomizes them and display one in a TextView, here's the code: - (IBAction)azione{ NSArray *myArray= [NSArray arrayWithObjects: @"Pasta",@"Pizza",@"Wait",@"Go", nil]; int length = [myArray count]; int chosen = arc4random() % length; testo.text = [myArray objectAtIndex: chosen]; } what I want to do now, is when I open the app and get a random object, to take it out from the list, so that it won't be picked again ex. I open the appI get "Pizza"Do the action againI don't get "Pizza" anymore, only "Pasta" "Wait" and "Go" What should I do ? Which code should I use ? Thanks for answers

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• Populate JSP dropdown with database info

  - by Cano63

  I'm looking for the way to populate a JSP dropdown. I want that when the JSP loads it fills the dropdown with the info that I have in a database table. I'm including the code of my class that will create the array and fill it with the database info. What I don't know is how to call that class from my JSP and fill the dropdown. // this will create my array public static ArrayList<DropDownBrands> getBrandsMakes() { ArrayList<DropDownBrands> arrayBrandsMake = new ArrayList<DropDownBrands>(); while (rs.next()) { arrayBrandsMake.add(loadOB(rs)); // CARGO MI ARREGLO CON UN OBJETO } return arrayBrandsMake; } // this will load my array object private static DropDownBrands loadOB(ResultSet rs) throws SQLException { DropDownBrands OB = new DropDownBrands(); OB.setBrands("BRAN"); return OB; }

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• c# Active Directory via WMI

  - by Juri Bogdanov

  Hi! Does anyone has some example about accessing Active Directory, LDAP querying using WMI (System.Management namespace) and not System.DirectoryServices namespace. Here on MSDN page it is described a little using CIM classes http://msdn.microsoft.com/en-us/library/aa392320(v=VS.85).aspx But I cant find some C# example realizing it. For example, to access some Win32 class you have to initialize Scope object to use CIMV2 namespace private ConnectionOptions connection; private ManagementScope scope; ... connection = new ConnectionOptions(); ... scope = new ManagementScope("\\\\" + computer + "\\root\\CIMV2", connection); try { scope.Connect(); } And use ObjectQuery class for querying WMI data ObjectQuery objectQuery = new ObjectQuery("SELECT Name FROM Win32_Processor"); ManagementObjectSearcher searcher = ManagementObjectSearcher(scope, objectQuery); foreach (ManagementObject queryObj in searcher.Get()) { return queryObj["Name"].ToString(); } How is it possible to access AD using the same scope? Thanks :)

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• Pros and cons of programmatically enforcing foreign key than in database

  - by Jeffrey

  It is causing so much trouble in terms of development just by letting database enforcing foreign key. Especially during unit test I can’t drop table due to foreign key constrains, I need to create table in such an order that foreign key constrain warning won’t get triggered. In reality I don’t see too much point of letting database enforcing the foreign key constrains. If the application has been properly designed there should not be any manual database manipulation other than select queries. I just want to make sure that I am not digging myself into a hole by not having foreign key constrains in database and leaving it solely to the application’s responsibility. Am I missing anything? P.S. my real unit tests (not those that use mocking) will drop existing tables if the structure of underlying domain object has been modified.

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• Grid View Pagination.

  - by Wondering

  Dear All, I have a grid view and I want to implement Pagination functionality.This is working fine. protected DataSet FillDataSet() { string source = "Database=GridTest;Server=Localhost;Trusted_Connection=yes"; con = new SqlConnection(source); cmd = new SqlCommand("proc_mygrid", con); ds = new DataSet(); da = new SqlDataAdapter(cmd); da.Fill(ds); GridView1.DataSource = ds; GridView1.DataBind(); return ds; } protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e) { int newPagenumber = e.NewPageIndex; GridView1.PageIndex = newPagenumber; GridView1.DataSource = FillDataSet(); GridView1.DataBind(); } But the problem is for each pagination I have to call FillDataSet(); Is there any way to stop that.Any other coding approach? Thanks.

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• What features are important in a programming language for young beginners?

  - by NoMoreZealots

  I was talking with some of the mentors in a local robotics competition for 7th and 8th level kids. The robot was using PBASIC and the parallax Basic Stamp. One of the major issues was this was short term project that required building the robot, teaching them to program in PBASIC and having them program the robot. All in only 2 hours or so a week over a couple months. PBASIC is kinda nice in that it has built in features to do everything, but information overload is possible to due this. My thought are simplicity is key. When you have kids struggling to grasp: if X>10 then <DOSOMETHING> There is not much point in throwing "proper" object oriented programming at them. What are the essentials needed to foster an interest in programming?

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• What is the underlying reason for not being able to put arrays of pointers in unsafe structs in C#?

  - by cons

  If one could put an array of pointers to child structs inside unsafe structs in C# like one could in C, constructing complex data structures without the overhead of having one object per node would be a lot easier and less of a time sink, as well as syntactically cleaner and much more readable. Is there a deep architectural reason why fixed arrays inside unsafe structs are only allowed to be composed of "value types" and not pointers? I assume only having explicitly named pointers inside structs must be a deliberate decision to weaken the language, but I can't find any documentation about why this is so, or the reasoning for not allowing pointer arrays inside structs, since I would assume the garbage collector shouldn't care what is going on in structs marked as unsafe. Digital Mars' D handles structs and pointers elegantly in comparison, and I'm missing not being able to rapidly develop succinct data structures; by making references abstract in C# a lot of power seems to have been removed from the language, even though pointers are still there at least in a marketing sense. Maybe I'm wrong to expect languages to become more powerful at representing complex data structures efficiently over time.

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• Django version in GAE

  - by Alex

  I'm tring to use Django 1.1 in GAE, But when I uncomment use_library('django', '1.1') in this script import os os.environ['DJANGO_SETTINGS_MODULE'] = 'settings' from google.appengine.dist import use_library #use_library('django', '1.1') # Google App Engine imports. from google.appengine.ext.webapp import util # Force Django to reload its settings. from django.conf import settings settings._target = None import django.core.handlers.wsgi import django.core.signals import django.db import django.dispatch.dispatcher # Unregister the rollback event handler. django.dispatch.dispatcher.disconnect( django.db._rollback_on_exception, django.core.signals.got_request_exception) def main(): # Create a Django application for WSGI. application = django.core.handlers.wsgi.WSGIHandler() # Run the WSGI CGI handler with that application. util.run_wsgi_app(application) if __name__ == "__main__": main() I receives AttributeError: 'module' object has no attribute 'disconnect' What is going on?

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• Script stops working on HSQLDB 1.9.0-rc6

  - by jacklty

  DROP VIEW V1 IF EXISTS; DROP TABLE T1 IF EXISTS; CREATE TABLE T1 (id INT, name VARCHAR(32), age int); CREATE VIEW V1 AS (SELECT * FROM T1 WHERE age < 21); I have no problem to execute the SQL statement above in one JDBC statement or on the SWING Manager from HSQLDB. Now it stops working on 1.9.0-rc6. This is error message I got - "user lacks privilege or object not found: T1 / Error Code: -5501 / State: 42501" Does anyone know what have changed in 1.9.0-XX which made it not working? Thanks

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• JsonResult shows up a file download in browser

  - by joshb

  I'm trying to use jquery.Ajax to post data to an ASP.NET MVC2 action method that returns a JsonResult. Everything works great except when the response gets back to the browser it is treated as a file download instead of being passed into the success handler. Here's my code: Javascript: <script type="text/javascript"> $(document).ready(function () { $("form[action$='CreateEnvelope']").submit(function () { $.ajax({ url: $(this).attr("action"), type: "POST", data: $(this).serialize(), dataType: "json", success: function (envelopeData) { alert("test"); } }); }); return false; }); </script> Action method on controller: public JsonResult CreateEnvelope(string envelopeTitle, string envelopeDescription) { //create an envelope object and return return Json(envelope); } If I open the downloaded file the json is exactly what I'm looking for and the mime type is shown as application/json. What am I missing to make the jquery.ajax call receive the json returned?

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• Which OOD approach should I take?

  - by Sorush Rabiee

  According to Niklaus Wirth, Algorithms + Data Structures = Programs. So I use this as a start point to object-oriented modeling and inheritance design: in a way that I separate the 'Objects' from 'Operations'. then look for patterns and inheritance hierarchy. But now after practice I guess it's not a good idea for every modeling problem, because sometimes it's not effective. (I mean there is no possibility of developing (or is very hard to develop) codes of Turing-Completed languages based on this paradigm.) What is your viewpoint for designing an OOD structure as an experienced programmer?

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• pubsub link with Project Rome

  - by itsadok

  I want to use Project Rome to create an RSS feed, using the code from the tutorial as base. I would like to add a pubsubhubbub discovery link, but there doesn't seem to be a general way to do so. I can use a Link object if I create an atom feed (which I don't want to limit myself to), or I can just add foreign markup, like this: // import org.jdom.Element Element element = new Element("link"); element.setAttribute("rel", "hub"); element.setAttribute("href", "https://myhub.example.com/endpoint"); feed.setForeignMarkup(Arrays.asList(element)); But it feels ugly. Is this really the best way to do this?

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• Traverse list to add elements, C#.

  - by Addie

  I have a list of objects. Each object has an integer quantity and a DateTime variable which contains a month and year value. I'd like to traverse the list and pad the list by adding missing months (with quantity 0) so that all consecutive months are represented in the list. What would be the best way to accomplish this? Example: Original List { Jan10, 3 }, { Feb10, 4 }, { Apr10, 2 }, { May10, 2 }, { Aug10, 3 }, { Sep10, -3 }, { Oct10, 6 }, { Nov10, 3 }, { Dec10, 7 }, { Feb11, 3 } New List { Jan10, 3 }, { Feb10, 4 }, {Mar10, 0}, { Apr10, 2 }, { May10, 2 }, { Jun10, 0 }, { Jul10, 0 } { Aug10, 3 }, { Sep10, -3 }, { Oct10, 6 }, { Nov10, 3 }, { Dec10, 7 }, { Jan11, 0 }, { Feb11, 3 }

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• C# winforms: DataSet with multiple levels of related tables

  - by Jake

  Hi, I am trying to use DataSet and DataAdapter to "filter" and "navigate" DataRows in DataTables. THE SITUATION: I have multiple logical objects, e.g. Car, Door and Hinge. I am loading a Form which will display complete Car information including each Door and their respective Hinges. In this senario, The form should display info for 1 car, 4 doors and 2 hinges for each door. Is it possible to use a SINGLE DataSet to navigate this Data? i.e. 1 DataRow in car_table, 4 DataRow in door_table and 8 DataRow in hinge_table, and still be able to navigate correctly between the different object and their relations? AND, able to DataAdapter.Update() easily? I have read about DataRelation but don't really understand how to use it. Not sure if it is the correct direction for my problem. Appreciate any advise. Thanks!

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• Microsoft.Biztalk.explorerom.dll reference in asp.net application resulting system.nullreferenceexce

  - by sheetal.oza

  Hi, I have a asp.net application in order to start/stop applications and ports of Biztalk server 2006 r2. I have used "Microsoft.Biztalk.explorerom.dll (C:/Program Files/Biztalk Server 2006/Developer tool) " to achieve this. This is working fine on development machine since biz talk server is installed on local machine. But in the production environment (asp.net web server ,windows 2003 and iis 6.0)...this give System.nullreferenceexception (object reference not set..) at BtsCatalogExplorer explorer = (BtsCatalogExplorer)myGroup.CreateInstance(typeof(BtsCatalogExplorer)) my biztalk server and sql server are on two different box. In my setup (asp.net web application)..adding Microsoft.Biztalk.explorerom.dll and Microsoft.Biztalk.Applicationdeployment.engine.dll to GAC. But still no luck. Do i need to install biz talk server on my local machine even though I am connecting to different biz talk server?? And help is appreciated...

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• exceptions with python unicode encode/decode functions (why doesn't errors=ignore actually ignore th

  - by gatoatigrado

  Does anyone know why the string conversion functions throw exceptions when errors="ignore" is passed? How can I convert from regular Python string objects to unicode without errors being thrown? Thanks very much! python -c "import codecs; codecs.open('tmp', 'wb', encoding='utf8', errors='ignore').write('?????')" returns Traceback (most recent call last): File "", line 1, in File "/usr/lib/python2.6/codecs.py", line 686, in write return self.writer.write(data) File "/usr/lib/python2.6/codecs.py", line 351, in write data, consumed = self.encode(object, self.errors) UnicodeDecodeError: 'ascii' codec can't decode byte 0xd0 in position 0: ordinal not in range(128)

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• jQuery parent of a parent

  - by Bloudermilk

  Hello, I am currently trying to find the parent of a parent of an element. I have a link being clicked that is in a <td>, and I'd like to get the <tr> object. Why wont "$(this).parent().parent()" work? What will? Thanks, Brendan Edit: It appears an error in my syntax was throwing the whole thing off. "$(this).parent().parent()" does in fact work, but I wound up going with $(this).closest('tr')" because it seems like the most efficient solution.

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• How to add a dynamic library to Android?

  - by Malcolm

  I want to add a non-native shared library to Android so every application on the device would be able to use it. I mean using packaged classes just like a core library as if they were present in the application itself. I studied Android source code to figure out a way to add a new path to the application ClassLoader and found out that it is created during startup and there's no way to change the paths later. I can use my own ClassLoader, but all I will get after loading a class will be a reference to a Class object. This way I will be bound to work through reflection mechanism, which is slower than the native execution system. Is there any way to organise a shared library on Android?

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