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• Deserialization on client side in Domain Service

  - by ankit

  I have 2 classes: Person and Contact. Person class has a property named ContactNumber which returns the Contact type, and this property is marked as a DataMember for serialization. I have marked Contact type as a DataContract. On the client side I am able to get the values, but when I try to insert a value and then do submit, I get the following exception: Failed to deserialize change-set. Failed to convert value of type 'Dictionary`2' to type 'Contact' Stack Trace is: at System.Web.Ria.DataServiceSubmitRequest.GetChangeSet(DomainService domainService) at System.Web.Ria.DataServiceSubmitRequest.Invoke(DomainService domainService) at System.Web.Ria.DataService.System.Web.IHttpHandler.ProcessRequest(HttpContext context) Can anyone give me the solution ?

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• DB4o Linq query - How to check for null strings

  - by Dave

  Hey there - simple query: var q = (from SomeObject o in container where o.SomeInt > 8 && o.SomeString != null //Null Ref here select o; I always get a null reference exception. If I use String.IsNullOrEmpty(o.SomeString) the query takes about 100 times as long, as if I use && o.SomeString != "" (which is way faster, but obviously not correct). I'm guessing because DB4o needs to activate the objects, in order to pass them in to the IsNullOrEmpty call, and can't use the indexes. My question is, what's a better way to check for nulls in this situation? Is there something like: mystring != Db4o.DBNull.Value, or something? Cheers, Dave

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• how to write extension method to check string value is null or not.

  - by kumar

  Hi all, (LocalVariable)ABC.string(Name)= (Idatareader)datareader.GetString(0); this name value is coming from database.. what happening here is if this name value is null while reading it's throwing an exception? I am manually doing some if condition here. I don't want to write a manual condition to check all my variables.. I am doing something like this now.. string abc = (Idatareader)datareader.GetValue(0); if(abc = null) //assiging null else assiging abc value is there something like can we write extension method for this? thanks

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• Struts2 JPA Validation error how to forward to action and not lose ActionErrors messages ?

  - by Sebastien Dionne

  I'm using Hibernate validator 4.1 to validate my entity. I have a dashboard that I can access from the action : viewDashboard. In my action, I load 2 List in my acion like this. public String execute() throws Exception { listDocteur = service.listDocteur(); listUser = service.listUser(); return SUCCESS; } In the DashBoard, I have a submit that can add a User. <action name="saveUser" class="com.test.action.CreateUserAction" method="execute" <interceptor-ref name="mybasicStackWithValidation" </interceptor-ref <result name="input"/WEB-INF/jsp/viewDashboard.jsp</result <result name="success" type="redirectAction"viewDashboard</result </action if I submit invalid value, I'll see the error messages, but I'll lose my 2 Lists. If I have a type="redirectAction".. I lose the error messages. in Struts 1, I would forward to the action viewDashboard.do without a redirect and that will works.. but How to do that in Struts2 ?

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• C# Class Instantiation Overflow

  - by Goober

  Scenario I have a C# Win Forms App, where the Main Form contains a loop that creates 3000 Instances of another form (Form B). Inside Form B there are a large number of properties and fields and a bunch of methods that do a fair amount of processing. Question Will the creation of 3000 of these classes give me problems? I'm thinking along the lines of memory exceptions? I've had 1 or 2 already, and I've also had an exception that says something along the lines of "Something went bang and this is usually a sign of corrupt memory somewhere else". Setup I'm using a DevExpress Ribbon Form and I haven't implemented Dispose on anything....Do I need to? Help greatly appreciated.

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• what is this 'content_type' mean..

  - by zjm1126

  content_type = ContentType.objects.get_for_model(Map) maps = maps.extra(select=SortedDict([ ('member_count', MEMBER_COUNT_SQL), ('topic_count', TOPIC_COUNT_SQL), ]), select_params=(content_type.id,)) and the ContentType is: class ContentType(models.Model): name = models.CharField(max_length=100) app_label = models.CharField(max_length=100) model = models.CharField(_('python model class name'), max_length=100) objects = ContentTypeManager() class Meta: verbose_name = _('content type') verbose_name_plural = _('content types') db_table = 'django_content_type' ordering = ('name',) unique_together = (('app_label', 'model'),) def __unicode__(self): return self.name def model_class(self): "Returns the Python model class for this type of content." from django.db import models return models.get_model(self.app_label, self.model) def get_object_for_this_type(self, **kwargs): """ Returns an object of this type for the keyword arguments given. Basically, this is a proxy around this object_type's get_object() model method. The ObjectNotExist exception, if thrown, will not be caught, so code that calls this method should catch it. """ return self.model_class()._default_manager.using(self._state.db).get(**kwargs) def natural_key(self): return (self.app_label, self.model) i want to know: what is the 'content_type' used for ??

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• Marshal managed string[] to unmanaged char**

  - by Vince

  This is my c++ struct (Use Multi-Byte Character Set) typedef struct hookCONFIG { int threadId; HWND destination; const char** gameApps; const char** profilePaths; } HOOKCONFIG; And .Net struct [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)] public struct HOOKCONFIG { public int threadId; public IntPtr destination; // MarshalAs? public string[] gameApps; // MarshalAs? public string[] profilePaths; } I got some problem that how do I marshal the string array? When I access the struct variable "profilePaths" in C++ I got an error like this: An unhandled exception of type 'System.AccessViolationException' occurred in App.exe Additional information: Attempted to read or write protected memory. This is often an indication that other memory is corrupt. MessageBox(0, cfg.profilePaths[0], "Title", MB_OK); // error ... Orz

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• SqlBulkCopy unusual TimeOut Error

  - by ChrisHDog

  I have a SqlBulkCopy operation that is taking data from an MS-Access 2007 database (via OleDbConnection) and using SqlBulkCopy to transfer that data to a SQL Server database. This has previously been working and continues to work for one MS-Access database, but not the other. I get the error message: Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding. It is hard to believe it is a timeout ast the oledbCommand.CommandTimeout = 0 the sqlBulkCopy.BulkCopyTimeout = 0 and on either side (MS-Access and SQL Server the timeouts have now been set to 0). Are there other issues/exceptions that the above error message could be hiding? Is there a way to determine what the base cause of a sqlBulkCopy.WriteToServer exception is (there doesn't appear to be any inner exceptions etc...)

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• Wicket app in embedded Jetty causes UnsupportedClassVersionError

  - by Ondra Žižka

  I've tried to run a Wicket app in an embedded Jetty, using this code: public static void main( String[] args ){ Server server = new Server(8080); Context root = new Context( server, "/", Context.SESSIONS ); FilterHolder filterHolder = new FilterHolder( new WicketFilter() ); filterHolder.getInitParameters().put("applicationClassName", cz.dw.test.WicketApplication.class.getName() ); root.addFilter( filterHolder, "/*" , Handler.ALL ); try { server.start(); } catch (Exception ex) { ex.printStackTrace(); } } But I got java.lang.UnsupportedClassVersionError: Bad version number in .class file. Switching the target class version for my app (1.6 - 1.5) did not help. I use Sun JDK 1.6.0_17, Wicket 1.4.8, Jetty 6.1.24. I tried to debug, but the JRE classes have no debug data. The stacktrace is of no use as it happens when loading the classes into JVM. Any ideas what could be wrong? How can I find which class is causing this? Thanks, Ondra

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• Using a c# .net object in an Excel VBA form

  - by Mark O'G

  Hi I have a .net object that I want to use in Excel. I have an existing VBA script that i need to alter to call this the object from. I have then converted the object to a TLB. I've not really touched on this area before so any help will be appreciated. I have created an interface [Guid("0F700B48-E0CA-446b-B87E-555BCC317D74"),InterfaceType(ComInterfaceType.InterfaceIsDual)] public interface IOfficeCOMInterface { [DispId(1)] void ResetOrder(); [DispId(2)] void SetDeliveryAddress(string PostalName, string AddressLine1, string AddressLine2, string AddressLine3, string AddressLine4, string PostCode, string CountryCode, string TelephoneNo, string FaxNo, string EmailAddress); } I have also created an class that inherits that object. [ClassInterface(ClassInterfaceType.None), ProgId("NAMESPACE.OfficeCOMInterface"), Guid("9D9723F9-8CF1-4834-BE69-C3FEAAAAB530"), ComVisible(true)] public class OfficeCOMInterface : IOfficeCOMInterface, IDisposable { public void ResetSOPOrder() { } public void SetDeliveryAddress(string PostalName, string AddressLine1, string AddressLine2, string AddressLine3, string AddressLine4, string PostCode, string CountryCode, string TelephoneNo, string FaxNo, string EmailAddress) { try { SalesOrder.AmendDeliveryAddress(PostalName, AddressLine1, AddressLine2, AddressLine3, AddressLine4, PostCode); MessageBox.Show("Delivery address set"); } catch (Exception ex) { throw ex; } } }

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• Copying a java text file into a String.

  - by Deepak Konidena

  Hi, I run into the following errors when i try to store a large file into a string. Exception in thread "main" java.lang.OutOfMemoryError: Java heap space at java.util.Arrays.copyOf(Arrays.java:2882) at java.lang.AbstractStringBuilder.expandCapacity(AbstractStringBuilder.java:100) at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:515) at java.lang.StringBuffer.append(StringBuffer.java:306) at rdr2str.ReaderToString.main(ReaderToString.java:52) As is evident, i am running out of heap space. Basically my pgm looks like something like this. FileReader fr = new FileReader(<filepath>); sb = new StringBuffer(); char[] b = new char[BLKSIZ]; while ((n = fr.read(b)) > 0) sb.append(b, 0, n); fileString = sb.toString(); Can someone suggest me why i am running into heap space error? Thanks.

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• Casting between classes that share the same interface

  - by Chad

  I have two interfaces IHeaderRow, and IDetailRow I then have an object that implements both RawRow:IHeaderRow, IDetailRow I then need to cast it to HeaderRow which implements IHeaderRow. But when I try, it ends up being null or giving an exception. I can cast ObjectRawRow to either interface IHeaderRow, or IDetailRow var ObjectIHeaderRow = ObjectRawRow as IHeaderRow; var ObjectIDetailRow = ObjectRawRow as IDetailRow; But I can not cast ObjectRawRow to HeaderRow , or ObjectIHeaderRow to HeaderRow. It throws the error Cannot convert source type 'IA' to target type 'A' I need to cast it into the actual class HeaderRow. Thoughts?

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• How to rebind another UDP socket port properly?

  - by Jollian

  When my client application launchs, it binds the UDP port like this: this.BindPort(5001); The BindPort method implement blow: public void BindPort(int port) { m_listener = new Socket( AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp ); IPEndPoint Point = new IPEndPoint( IPAddress.Any, Port ); m_listener.Bind( port); m_listener.BeginReceive( buff, 0, buff.Length, SocketFlags.None, new AsyncCallback( DataReceived ), buff ); } And when my server application commands client to bind to another UDP port(e.g. 5005). I call the same BindPort method in client. Then a exception occurs at DataReceived method. I think there must be a problem that I don't close the UDP port properly. But how can i close the UDP socket properly and rebind to another one. Thanks.

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• Silverlight datagrid don't show any data with anonymous query RIA services

  - by user289082

  Hi all! I have an anonymous linq query that I bind to a datagrid, when I debug it brings alright the data but it doesn't show in the datagrid, I suspect that the request to RIA services isn't completed before I bound it to the datagrid. I could use the LoadOperation<() Completed event. But it only works with Defined Entities so how can I do that? For reference here is the last post: http://stackoverflow.com/questions/2403903/linq-query-null-reference-exception Here is the query: var bPermisos = from b in ruc.Permisos where b.IdUsuario == SelCu.Id select new { Id=b.Id, IdUsuario=b.IdUsuario, IdPerfil=b.IdPerfil, Estatus=b.Estatus, Perfil=b.Cat_Perfil.Nombre, Sis=b.Cat_Perfil.Cat_Sistema.Nombre }; I'm a totally newbie sorry if is a very simple question. Thanks!!

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• How to handle concurrency control in dynamic data?

  - by Andrew

  I've been quite impressed with dynamic data and how easy and quick it is to get a simple site up and running. I'm planning on using it for a simple internal HR admin site for registering people's skills/degrees/etc. I've been watching the intro videos at www.asp.net/dynamicdata and one thing they never mention is how to handle concurrency control. It seems that DD does not handle it right out of the box (unless there is some setting I haven't seen) as I manually generated a change conflict exception and the app failed without any user friendly message. Anybody know if DD handles it out of the box? Or do you have to somehow build it into the site?

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• ArrayBlockingQueue - How to "interrupt" a thread that is wating on .take() method

  - by bernhard

  I use an ArrayBlockingQueue in my code. Clients will wait untill an element becomes available: myBlockingQueue.take(); How can I "shutdown" my service in case no elements are present in the queue and the take() ist wating indefenitely for an element to become available? This method throws an InterruptedException. My question is, how can I "evoke" an Interrupted Exception so that take() will quit? (I also tought about notify(), but it seems I doesnt help here..) I know I could insert an special "EOF/QUIT" marker Element but is this really the only solution? UPDATE (regarding the comment, that points to another question with two solutions: one mentioned above using a "Poisoning Pill Object" and the second one is Thread.interrupt(): The myBlockingQueue.take() is used NOT in a Thread (extending Thread) but rather implements Runnable. It seems a Runnable does not provide the .interrupt() method? How could I interrupt the Runnable? Million Thanks Bernhard

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• usedefaultcredentials in order to call DirectoryEntry

  - by Copeleto

  Hi, I am working in a Login page and teh logic is like - try { DirectoryEntry LDAPLogin = new DirectoryEntry(ConfigurationSettings.AppSettings ["LDAPPath"].ToString(), Usuario, Txt_Contrasenia.Text.ToString()); if (LDAPLogin.NativeGuid != LDAPLogin.Name) ValidarGrupo(); } catch (Exception exc) { Label_Info.Text = "Sus credenciales no son validas: " + Usuario.ToString() + " " + exc.Message; } If the user enters the rights credentials I call a method ValidarGrupo that implements a lookup in the AD for a group of the user I woould like to replace the username and password with UseDefaultCredentials in order to avoid that the user has to enter the username and password and the Login pages use the credentials of the user that is login on the machine.

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• How to handle model state errors in ajax-invoked controller action that returns a PartialView

  - by Robert Koritnik

  I have a POST controller action that returns a partial view. Everything seems really easy. but. I load it using $.ajax(), setting type as html. But when my model validation fails I thought I should just throw an error with model state errors. But my reply always returns 500 Server error. How can I report back model state errors without returning Json with whatever result. I would still like to return partial view that I can directly append to some HTML element. Edit I would also like to avoid returning error partial view. This would look like a success on the client. Having the client parse the result to see whether it's an actual success is prone to errors. Designers may change the partial view output and this alone would break the functionality. So I want to throw an exception, but with the correct error message returned to the ajax client.

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• How to make a thread try to reconnect to the Database x times using JDBCTemplate

  - by gillJ

  Hi, I have a single thread trying to connect to a database using JDBCTemplate as follows: JDBCTemplate jdbcTemplate = new JdbcTemplate(dataSource); try{ jdbcTemplate.execute(new CallableStatementCreator() { @Override public CallableStatement createCallableStatement(Connection con) throws SQLException { return con.prepareCall(query); } }, new CallableStatementCallback() { @Override public Object doInCallableStatement(CallableStatement cs) throws SQLException { cs.setString(1, subscriberID); cs.execute(); return null; } }); } catch (DataAccessException dae) { throw new CougarFrameworkException( "Problem removing subscriber from events queue: " + subscriberID, dae); } I want to make sure that if the above code throws DataAccessException or SQLException, the thread waits a few seconds and tries to re-connect, say 5 more times and then gives up. How can I achieve this? Also, if during execution the database goes down and comes up again, how can i ensure that my program recovers from this and continues running instead of throwing an exception and exiting?

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• syntax error in python:

  - by pecker

  Hello, I'm learning python. It gives syntax error in this script. I'm unable to figure out. import exceptions class FOUND(Exception): pass x = [1,2,3,4,56,73,29,35,12,32,63,12,76,75,89] while True: test = int(raw_input('Enter integer to be checked in list:')) try: count = -1 for y in x: count += 1 if y == test: raise FOUND except ValueError,e: print "Not a valid integer (%d)"%(e) except FOUND: print "Found (%d) at (%d)"%(test,count) else: print "Not found ,Appending (%d) to list at location (%d)"%(test,count+1) x.append(test) finally: print "The List:" print x print " " Invalid syntax & it highlights comma in this line: 'except ValueError,e:'

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• Cocoa -- getting a simple NSImageView to work

  - by William Jockusch

  I am confused about why this code does not display any image: In the app delegate: - (void)applicationDidFinishLaunching:(NSNotification *)aNotification { NSRect rect = window.frame; rect.origin.x = 0; rect.origin.y = 0; BlueImageView *blueImageView = [[BlueImageView alloc]initWithFrame:rect]; window.contentView = blueImageView; // also tried [window.contentView addSubview: blueImageView]; } BlueImageView.h: @interface BlueImageView : NSImageView { } @end BlueImageView.m: @implementation BlueImageView - (id)initWithFrame:(NSRect)frame { self = [super initWithFrame:frame]; if (self) { [self setImage: [NSImage imageNamed:@"imagefile.png"]]; NSAssert(self.image, @""); NSLog (@"Initialized"); } return self; } - (void)drawRect:(NSRect)dirtyRect { } @end The file imagefile.png exists. The NSAssert is not causing an exception. The NSLog is firing. But no image shows up in the window.

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• PagedDataSource does not support serialization - how can I enforce this ?

  - by Darkyo

  Sounds like I want to override a physics law, but at least it is the most reasonnable solution, cpu / HDD and Ram effective for my asp.net project. In fact, I got a pageddataSource and a customDataReader that supports paginated data. The truth is my data are in a viewstate variable, because it is re-used in an update panel. When I intend to use it into my pageddatasource, asp.net 3.5 kills me with a System.Web.UI.WebControls.PagedDataSource' in Assembly 'System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' is not marked as serializable. cool exception... So I'd rather not offend newton because I know he'll always win, but I would need some help to enforce this pagedDataSource law, that seems so unbelievable, except if someone has an explanation.

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• Why doesnt doesnt HTML input of type file not work with Ajax update panel

  - by Sean P

  I have a input of type file and when i try to do a Request.files when the input is wrapped in an update panel...it always returns an empty httpfilecollection. Why??? This is the codebehind: (At HttpContext.Current.Request.Files...its always 0 for the count.) Protected Sub btnSubmit_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnSubmit.Click Dim uploads As HttpFileCollection uploads = HttpContext.Current.Request.Files For i As Integer = 0 To (uploads.Count - 1) If (uploads(i).ContentLength > 0) Then Dim c As String = System.IO.Path.GetFileName(uploads(i).FileName) Try uploads(i).SaveAs("C:\UploadedUserFiles\" + c) Span1.InnerHtml = "File Uploaded Sucessfully." Catch Exp As Exception Span1.InnerHtml = "Some Error occured." End Try End If Next i End Sub This example comes from the ASP.Net website...but my application is very similar.

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• Need help configuring SQL Server CE connections string in Fluent NHibernate

  - by Yoav

  Hi, I'm trying to return a session factory using this code: return Fluently.Configure() .Database(MsSqlCeConfiguration.Standard.ShowSql().ConnectionString(path)) .Mappings(m => m.FluentMappings.AddFromAssemblyOf<Project>()) .BuildSessionFactory(); Path is the full path to an .sdf file. And get this exception: System.ArgumentException: Format of the initialization string does not conform to specification starting at index 0. at System.Data.SqlServerCe.ConStringUtil.GetKeyValuePair(Char[] connectionString, Int32 currentPosition, String& key, Char[] valuebuf, Int32& vallength, Boolean& isempty) What am I doing wrong?

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• How to set initial checked values of rich tree leaf node.

  - by Ajay99

  Hi, How to set the initial the leaf node values. -----------------------Stations.xml AAAAAAAAAAAA BBBBBBBBBBBB CCCCCCCCCC DDDDDDDDDDDD EEEEEEEEEEEEEE Hall Oates - Kiss On My List David Bowie - Let's Dance Lyn Collins - Think (About It) Kim Carnes - Bette Davis Eyes KC the Sunshine Band - Give It Up //inital check values --------------------Libray.java---------------- public class Library { private TreeNode treeData; private List menus=null; public Library()throws Exception { menus=new ArrayList(); //it's initial selection of the check box vardata.attributes.selection("---key1---); vardata.attributes.selection("---key2---); vardata.attributes.selection("---keyn---); yoursuggestedcode.attribute.selection("key"); //I need your suggestion code. FacesContext context = FacesContext.getCurrentInstance(); treeData = XmlTreeDataBuilder.build(new InputSource(getClass().getResourceAsStream("/Stations.xml"))); } public TreeNode getTreeData() { return treeData; } public void setTreeData(TreeNode treeData) { this.treeData = treeData; } public List getMenus() { return menus; } public void setMenus(List menus) { this.menus = menus; }

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