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  • C# BindingSource.AddingNew is never called?

    - by msfanboy
    Hello, BindingSource.AddingNew is never called when I leave the cell of my datagrid. The DataGrid has as datasource the BindingSource which again has a "List" of "Customer". What does the BindingSource need to create a new Customer object and add it to the underlying ICustomerList ? Of course a interface has no constructor... Thats the Exception I get: System.MissingMethodException: The constcructor for the type "SAT.EnCoDe.Administration.ICustomer" was not found. bei System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes) bei System.SecurityUtils.SecureCreateInstance(Type type, Object[] args) bei System.ComponentModel.BindingList1.AddNewCore() bei System.ComponentModel.BindingList1.System.ComponentModel.IBindingList.AddNew() bei System.Windows.Forms.BindingSource.AddNew() bei System.Windows.Forms.CurrencyManager.AddNew() bei DevExpress.Data.CurrencyDataController.OnCurrencyManagerAddNew() bei DevExpress.Data.CurrencyDataController.AddNewRow() bei DevExpress.XtraGrid.Views.Grid.GridView.OnActiveEditor_ValueModified(Object sender, EventArgs e) bei DevExpress.XtraEditors.Repository.RepositoryItem.RaiseModified(EventArgs e) bei DevExpress.XtraEditors.BaseEdit.OnEditValueChanging(ChangingEventArgs e) bei DevExpress.XtraEditors.TextEdit.OnMaskBox_ValueChanged(Object sender, EventArgs e) bei DevExpress.XtraEditors.Mask.MaskBox.RaiseEditTextChanged() bei System.Windows.Forms.TextBoxBase.WmReflectCommand(Message& m) bei DevExpress.XtraEditors.Mask.MaskBox.BaseWndProc(Message& m) bei DevExpress.XtraEditors.Mask.MaskBox.WndProc(Message& m) bei DevExpress.XtraEditors.TextBoxMaskBox.WndProc(Message& msg) bei System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m) bei System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

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  • SmartGWT with Rest Data Source Error

    - by Holograham
    I am getting the following error when retrieving data from a rest data source 00:00:52.439 [ERROR] 01:46:57.001:RDQ1:WARN:ResultSet:isc_ResultSet_1 (created by: isc_CustomerDocGrid_0):get: invalid index -1 com.smartgwt.client.core.JsObject$SGWT_WARN: 01:46:57.001:RDQ1:WARN:ResultSet:isc_ResultSet_1 (created by: isc_CustomerDocGrid_0):get: invalid index -1 at sun.reflect.NativeConstructorAccessorImpl.newInsta nce0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInsta nce(NativeConstructorAccessorImpl.java:39) at sun.reflect.DelegatingConstructorAccessorImpl.newI nstance(DelegatingConstructorAccessorImpl.java:27) at java.lang.reflect.Constructor.newInstance(Construc tor.java:513) at com.google.gwt.dev.shell.MethodAdaptor.invoke(Meth odAdaptor.java:105) at com.google.gwt.dev.shell.MethodDispatch.invoke(Met hodDispatch.java:71) at com.google.gwt.dev.shell.OophmSessionHandler.invok e(OophmSessionHandler.java:157) at com.google.gwt.dev.shell.BrowserChannel.reactToMes sages(BrowserChannel.java:1668) at com.google.gwt.dev.shell.BrowserChannelServer.proc essConnection(BrowserChannelServer.java:401) at com.google.gwt.dev.shell.BrowserChannelServer.run( BrowserChannelServer.java:222) at java.lang.Thread.run(Thread.java:619) Here is my data source (it extends RestDataSource) Code: public CustomerDataSource(String id) { setID(id); setDataFormat(DSDataFormat.XML); setRecordXPath("customerdoc"); setOperationBindings(); OperationBinding fetch = new OperationBinding(); fetch.setOperationType(DSOperationType.FETCH); fetch.setDataProtocol(DSProtocol.GETPARAMS); setOperationBindings(fetch); setDataURL("/customer"); I know my web service is returning data as I can display the XML file in my browser. This doesnt appear to be a parse error (i have seen those before). Not sure what the error means. Any help is appreciated.

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  • WCF Reliable Session Timeout

    - by RemotecUk
    Hi, when do reliable sessions time out? My session class is defined as follows: [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerSession, ConcurrencyMode = ConcurrencyMode.Multiple)] and in my app.config... <bindings> <netTcpBinding> <binding name="FTS_netTcpBinding"> <reliableSession enabled="true" inactivityTimeout="00:00:30"/> </binding> </netTcpBinding> </bindings> I have put a timer in the constructor of my session class that simply outputs a count (1..2..3...) to the console for every second the session is active. I have tested it so far by faulting my channel. I would have imagined that the session class would have died after ~30 seconds (as specified in my inactivityTimeout parameter) and hence the timer would have died. However it was still going after a minute. Each session on my app will have significant resources so I need to make sure that they are cleaned up when something goes wrong. Thanks.

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  • Loading Properties with Spring (via System Properties)

    - by gabe
    My problem is as follows: I have server.properties for different environments. The path to those properties is provided trough a system property called propertyPath. How can I instruct my applicationContext.xml to load the properties with the given propertyPath system property without some ugly MethodInvokingBean which calls System.getProperty(''); My applicationContext.xml <bean id="systemPropertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <property name="systemPropertiesModeName" value="SYSTEM_PROPERTIES_MODE_OVERRIDE"/> <property name="placeholderPrefix" value="sys{"/> <property name="properties"> <props> <prop key="propertyPath">/default/path/to/server.properties</prop> </props> </property> </bean> <bean id="propertyResource" class="org.springframework.core.io.FileSystemResource" dependency-check="all" depends-on="systemPropertyConfigurer"> <constructor-arg value="sys{propertyPath}"/> </bean> <bean id="serviceProperties" class="org.springframework.beans.factory.config.PropertiesFactoryBean"> <property name="location" ref="propertyResource"/> </bean> <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <property name="location" ref="propertyResource"/> <property name="placeholderPrefix" value="prop{"/> <property name="ignoreUnresolvablePlaceholders" value="true"/> <property name="ignoreResourceNotFound" value="false"/> </bean> <bean id="dataSource" class="org.springframework.jndi.JndiObjectFactoryBean"> <property name="jndiName" value="prop{datasource.name}"/> </bean> with this configuration the propertyResource alsways complains about java.io.FileNotFoundException: sys{propertyPath} (The system cannot find the file specified) Any suggestions? ;-) Thanks gabe

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  • Making a app show inside a GUI in Java

    - by José
    Hello. I have one problem I've been dealing with for this week. You see, I'm new to Java, so that's probably it... Anyways, I've started a project out of pure curiosity. I had it done in Java, but in plain CMD-style, which is not very pretty. It calls one of my ten programs, chosen by the user using "Case". Eg.: If you type 1, it will go to program 1. After you finish it, it goes back to selection until the user press 0. After that, I've been trying to make a GUI for it. I've been able to create the selector alone and make it respond to the numbers chosen. If you press 1 and click ok, it will tell you you've chosen program 1. I, however, have not been able to make it run the program. I've been trying to make the program show up in a jPanel, part of the main GUI. I failed miserably. The program runs in separate but I can't make them run together like the CMD one. The apps were made in Eclipse SDK 3.5.2 The GUIs were made in Netbeans IDE 6.8 Here's the code for the GUI only (the prints are in PT-BR, my native language): Main program: /* * To change this template, choose Tools | Templates * and open the template in the editor. */ /* * ProgramasGUI.java * * Created on 31/01/2010, 22:56:19 */ package Main; import Main.Prog1; /** * * @author Zeh® */ public class ProgramasGUI extends javax.swing.JFrame { /** Creates new form ProgramasGUI */ public ProgramasGUI() { initComponents(); } /** This method is called from within the constructor to * initialize the form. * WARNING: Do NOT modify this code. The content of this method is * always regenerated by the Form Editor. */ @SuppressWarnings("unchecked") // <editor-fold defaultstate="collapsed" desc="Generated Code"> private void initComponents() { selecao = new javax.swing.JTextField(); mostrador = new javax.swing.JLabel(); selecionar = new javax.swing.JButton(); mostrador1 = new javax.swing.JLabel(); jPanel1 = new javax.swing.JPanel(); setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); selecao.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { selecaoActionPerformed(evt); } }); mostrador.setText("Qual o programa desejado?"); selecionar.setText("OK"); selecionar.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { selecionarActionPerformed(evt); } }); mostrador1.setText("Saiba aqui o Programa escolhido!"); jPanel1.addComponentListener(new java.awt.event.ComponentAdapter() { public void componentShown(java.awt.event.ComponentEvent evt) { jPanel1ComponentShown(evt); } }); javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1); jPanel1.setLayout(jPanel1Layout); jPanel1Layout.setHorizontalGroup( jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGap(0, 100, Short.MAX_VALUE) ); jPanel1Layout.setVerticalGroup( jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGap(0, 100, Short.MAX_VALUE) ); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); getContentPane().setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addContainerGap() .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(selecao, javax.swing.GroupLayout.PREFERRED_SIZE, 203, javax.swing.GroupLayout.PREFERRED_SIZE) .addComponent(selecionar, javax.swing.GroupLayout.DEFAULT_SIZE, 203, Short.MAX_VALUE)) .addGap(18, 18, 18) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(mostrador1, javax.swing.GroupLayout.PREFERRED_SIZE, 193, javax.swing.GroupLayout.PREFERRED_SIZE) .addComponent(mostrador, javax.swing.GroupLayout.PREFERRED_SIZE, 179, javax.swing.GroupLayout.PREFERRED_SIZE))) .addGroup(layout.createSequentialGroup() .addGap(162, 162, 162) .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))) .addContainerGap()) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup() .addContainerGap(39, Short.MAX_VALUE) .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addGap(30, 30, 30) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(selecao, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addComponent(mostrador, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE)) .addGap(18, 18, 18) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(selecionar) .addComponent(mostrador1)) .addContainerGap()) ); pack(); }// </editor-fold> private void selecaoActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: } private void selecionarActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: int programa = (int)((Double.parseDouble(selecao.getText()))); switch (programa) { case 1: mostrador1.setText("O programa " + programa + " foi escolhido!" ); break; case 2: mostrador1.setText("O programa " + programa + " foi escolhido!" ); break; case 3: mostrador1.setText("O programa " + programa + " foi escolhido!" ); break; case 4: mostrador1.setText("O programa " + programa + " foi escolhido!" ); break; case 5: mostrador1.setText("O programa " + programa + " foi escolhido!" ); break; case 6: mostrador1.setText("O programa " + programa + " foi escolhido!" ); break; case 7: mostrador1.setText("O programa " + programa + " foi escolhido!" ); break; case 8: mostrador1.setText("O programa " + programa + " foi escolhido!" ); break; case 9: mostrador1.setText("O programa " + programa + " foi escolhido!" ); break; case 10: mostrador1.setText("O programa " + programa + " foi escolhido!" ); break;} } private void jPanel1ComponentShown(java.awt.event.ComponentEvent evt) { int programa = (int)((Double.parseDouble(selecao.getText()))); switch (programa) { case 1: addNotify(Prog1.); break;} } /** * @param args the command line arguments */ public static void main(String args[]) { java.awt.EventQueue.invokeLater(new Runnable() { public void run() { new ProgramasGUI().setVisible(true); } }); } // Variables declaration - do not modify private javax.swing.JPanel jPanel1; private javax.swing.JLabel mostrador; private javax.swing.JLabel mostrador1; private javax.swing.JTextField selecao; private javax.swing.JButton selecionar; // End of variables declaration } And here's the sub-program: /* * To change this template, choose Tools | Templates * and open the template in the editor. */ /* * Prog1.java * * Created on 02/02/2010, 23:57:59 */ package Main; /** * * @author Zeh® */ public class Prog1 extends javax.swing.JPanel { /** Creates new form Prog1 */ public Prog1() { initComponents(); } /** This method is called from within the constructor to * initialize the form. * WARNING: Do NOT modify this code. The content of this method is * always regenerated by the Form Editor. */ @SuppressWarnings("unchecked") // <editor-fold defaultstate="collapsed" desc="Generated Code"> private void initComponents() { jLabel1 = new javax.swing.JLabel(); numesc = new javax.swing.JLabel(); jLabel3 = new javax.swing.JLabel(); jLabel4 = new javax.swing.JLabel(); jButton1 = new javax.swing.JButton(); campo = new javax.swing.JTextField(); jLabel1.setText("Saiba aqui o Antecessor!"); numesc.setText("O número escolhido é: X"); jLabel3.setText("Saiba aqui o Sucessor!"); jLabel4.setText("Insira um número para saber seu Antecessor e Sucessor!"); jButton1.setText("Calcular!"); jButton1.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jButton1ActionPerformed(evt); } }); campo.setText("Insira seu número"); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this); this.setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addContainerGap() .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGap(16, 16, 16) .addComponent(jButton1)) .addComponent(campo, javax.swing.GroupLayout.PREFERRED_SIZE, 100, javax.swing.GroupLayout.PREFERRED_SIZE)) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGap(10, 10, 10) .addComponent(jLabel3)) .addGroup(layout.createSequentialGroup() .addGap(10, 10, 10) .addComponent(numesc, javax.swing.GroupLayout.DEFAULT_SIZE, 154, Short.MAX_VALUE)) .addComponent(jLabel1, javax.swing.GroupLayout.DEFAULT_SIZE, 164, Short.MAX_VALUE))) .addComponent(jLabel4)) .addContainerGap()) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup() .addContainerGap() .addComponent(jLabel4) .addGap(18, 18, 18) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(campo, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addComponent(jLabel1)) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(numesc) .addGap(11, 11, 11) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(jLabel3) .addComponent(jButton1)) .addContainerGap(24, Short.MAX_VALUE)) ); }// </editor-fold> private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { int num = (int)((Double.parseDouble(campo.getText()))); numesc.setText("O número escolhido é: " + num); int x = num-1; jLabel1.setText ("O antecessor é: " + x); int y = num+1; jLabel3.setText ("O sucessor é: " + y); } // Variables declaration - do not modify private javax.swing.JTextField campo; private javax.swing.JButton jButton1; private javax.swing.JLabel jLabel1; private javax.swing.JLabel jLabel3; private javax.swing.JLabel jLabel4; private javax.swing.JLabel numesc; // End of variables declaration } Any help would be very appreciated. If I, for some reason, made a mistake typing and/or setting the layout of this post incorrectly, please accept my apologies.

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  • Jaxb2Marshaller and primitive types

    - by Thomas Einwaller
    Is it possible to create a web service operation using primitive or basic Java types when using the Jaxb2Marschaller in spring-ws? For example a method looking like this: @Override @PayloadRoot(localPart = "AddTaskRequest", namespace = "http://example.com/examplews/") public long addTask(final Task task) throws AddTaskFault { // do something return 0; } I am using the maven jaxws plugin to generate the interface and model classes from my WSDL. When I try to call the webservice I get the following error: java.lang.IllegalStateException: No adapter for endpoint [...]: Does your endpoint implement a supported interface like MessageHandler or PayloadEndpoint I found out that if I change the method to that: @Override @PayloadRoot(localPart = "AddTaskRequest", namespace = "http://example.com/examplews/") public JAXBElement<Long> addTask(final JAXBElement<Task> task) throws AddTaskFault { final ObjectFactory objectFactory = new ObjectFactory(); return objectFactory.createAddTaskResponse(0L); } I am able to call it - but this signature is not compatible with the interface generated by the maven jaxws plugin. What can I do to configure either spring-ws to be able to use the first kind of implementation or to tell maven jaxws plugin to generate the second variant of the interface? UPDATE: My relevant spring-ws config entries look like that: <bean id="marshaller" class="org.springframework.oxm.jaxb.Jaxb2Marshaller"> <property name="contextPath" value="com.example.examplews" /> </bean> <bean class="org.springframework.ws.server.endpoint.adapter.GenericMarshallingMethodEndpointAdapter"> <constructor-arg ref="marshaller" /> </bean> <bean class="org.springframework.ws.server.endpoint.mapping.PayloadRootAnnotationMethodEndpointMapping"> <property name="order" value="1" /> </bean>

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  • Using @Context, @Provider and ContextResolver in JAX-RS

    - by Tamás
    I'm just getting acquainted with implementing REST web services in Java using JAX-RS and I ran into the following problem. One of my resource classes requires access to a storage backend, which is abstracted away behind a StorageEngine interface. I would like to inject the current StorageEngine instance into the resource class serving the REST requests and I thought a nice way of doing this would be by using the @Context annotation and an appropriate ContextResolver class. This is what I have so far: In MyResource.java: class MyResource { @Context StorageEngine storage; [...] } In StorageEngineProvider.java: @Provider class StorageEngineProvider implements ContextResolver<StorageEngine> { private StorageEngine storage = new InMemoryStorageEngine(); public StorageEngine getContext(Class<?> type) { if (type.equals(StorageEngine.class)) return storage; return null; } } I'm using com.sun.jersey.api.core.PackagesResourceConfig to discover the providers and the resource classes automatically, and according to the logs, it picks up the StorageEngineProvider class nicely (timestamps and unnecessary stuff left out intentionally): INFO: Root resource classes found: class MyResource INFO: Provider classes found: class StorageEngineProvider However, the value of storage in my resource class is always null - neither the constructor of StorageEngineProvider nor its getContext method is called by Jersey, ever. What am I doing wrong here?

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  • Using Fancybox with Google Static Maps

    - by Levi Hackwith
    Setup I have multiple links on a page with the class location_link Each Links rel attribute is equal to a city state combo (i.e.,Omaha, NE) Once the page is loaded, a JavaScript function loops through all of the location_link items and binds a click event to them using jQuery. This click event fires a call to the Fancybox constructor that is supposed to show a Google Map of the location that link is associated with The Problem: Whenever I click on one of the "location links", I get the following error message: The requested content cannot be loaded. Please try again later. Code I've Already Written: function setUpLocationLinks() { locationLinks = $("a.location_link"); locationLinks.click( function() { var me = $(this); console.log(me.attr("href")); $.fancybox( { "showCloseButton" : true, "hideOnContentClick" : true, "titlePosition" : "inside", "title" : me.attr("rel"), "type" : "image" } ) return false; } ); } Research I've Already Done: The Google Static Map API no longer requires an API Key. The following is from the Google Static Maps API Page Note: The Google Static Maps API no longer requires a Maps API key! (Google Maps API Premier customers should instead sign their URLs using a new cryptographic key which will be sent to you. See the Premier documentation for more information.) The The Image URL I'm using does resolve and pulls back the data I need When I put the above mentioned URL into a standard <img> tag, the map shows up just fine. I'd like to pull this off without having to create some sort of dummy <img> tag that I'm constantly switching the src attribute out of. Hopefully, you'll find this information helpful. Please let me know if you have any other questions.

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  • Set margins in a LinearLayout programmatically.

    - by Timmmm
    I'm trying to use Java (not XML) to create a LinearLayout with buttons that fill the screen, and have margins. Here is code that works without margins: LinearLayout buttonsView = new LinearLayout(this); buttonsView.setOrientation(LinearLayout.VERTICAL); for (int r = 0; r < 6; ++r) { Button btn = new Button(this); btn.setText("A"); LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.FILL_PARENT); // Verbose! lp.weight = 1.0f; // This is critical. Doesn't work without it. buttonsView.addView(btn, lp); } ViewGroup.LayoutParams lp = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT); setContentView(buttonsView, lp); So that works fine, but how on earth do you give the buttons margins so there is space between them? I tried using LinearLayout.MarginLayoutParams, but that has no weight member so it's no good. And it doesn't work if you pass it lp in its constructor either. Is this impossible? Because it sure looks it, and it wouldn't be the first Android layout task you can only do in XML.

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  • ProgressDialog not working in external AsyncTask

    - by eric
    I'm beginning to think that to get a ProgressDialog to work the AsyncTask has to be an inner class within an Activity class. True? I have an activity the uses a database to manipulate information. If the database is populated all is well. If it is not populated then I need to download information from a website, populate the database, then access the populated database to complete the Views in onCreate. Problem is without some means to determine when the AsyncTask thread has finished populating the database, I get the following Force Close error message: Sorry! The application has stopped unexpectedly. I click on the Force Close button, the background AsyncTask thread continues to work, the database gets populated, and everything works ok. I need to get rid of that error message and need some help on how to do this. Here's some psuedo code: public class ViewStuff extends Activity { onCreate { if(database is populated) do_stuff else { FillDB task = null; if(task == null || task.getStatus().equals(AsyncTask.Status.FINISHED)) { task = new FillDB(context); task.execute(null); } } continue with onCreate using information from database to properly display } // end onCreate } // end class In a separate file: public class FillDB extends AsyncTask<Void, Void, Void> { private Context context; public FillDB (Context c) //pass the context in the constructor { context = c; } public void filldb () { doInBackground(); } @Override protected void onPreExecute() { ProgressDialog progressDialog = new ProgressDialog(context); //crashes with the following line progressDialog.show(context, "Working..", "Retrieving info"); } @Override protected Void doInBackground(Void... params) { // TODO Auto-generated method stub try etc etc etc } } What am I doing wrong?

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  • Swig typecast to derived class?

    - by Zack
    I notice that Swig provides a whole host of functions to allow for typecasting objects to their parent classes. However, in C++ one can produce a function like the following: A * getAnObject() { if(someBoolean) return (A *) new B; else return (A *) new C; } Where "A" is the parent of classes "B" and "C". One can then typecast the pointer returned into being a "B" type or "C" type at one's convenience like: B * some_var = (B *) getAnObject(); Is there some way I can typecast an object I've received from a generic-pointer-producing function at run-time in the scripting language using the wrappers? (In my case, Lua?) I have a function that could produce one of about a hundred possible classes, and I'd like to avoid writing an enormous switch structure that I'd have to maintain in C++. At the point where I receive the generic pointer, I also have a string representation of the data type I'd like to cast it to. Any thoughts? Thanks! -- EDIT -- I notice that SWIG offers to generate copy constructors for all of my classes. If I had it generate those, could I do something like the following?: var = myModule.getAnObject(); -- Function that returns an object type-cast down to a pointer of the parent class, as in the function getAnObject() above. var = myModule.ClassThatExtendsBaseClass(var); -- A copy constructor that SWIG theoretically creates for me and have var then be an instance of the inheriting class that knows it's an instance of the inheriting class?

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  • MVVM Binding in Silverlight3 ItemsControl to get the parent controls DataContext

    - by BigTundra
    I have the following ItemsControl in Silverlight 3. <ItemsControl ItemsSource="{Binding ValueCollectionList}"> <ItemsControl.ItemTemplate> <DataTemplate> <Button x:Name="MyBtn" Height="40" Content="{Binding Name}" Tag="{Binding Value}" cmd:ButtonBaseExtensions.Command="{Binding ElementName=LayoutRoot, Path=ButtonCommand}" cmd:ButtonBaseExtensions.CommandParameter="{Binding ElementName=MyBtn, Path=Tag}"/> </DataTemplate> </ItemsControl.ItemTemplate> </ItemsControl> The Problem is that I have the ItemsControl bound to the Collection in my ViewModel, but I need the button to trigger a command on the ViewModel which is of course not Available in the DataContext of the button since it only contains the collection. I can make the command fire by setting my ViewModel as a Resource and then binding to it as a StaticResource, but I want to know why the element to element binding won't work in this scenario. I would prefer not to use the StaticResource binding because that requires the default constructor on the ViewModel and so I can't inject my data easily.

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  • dotRAS Disconnected State not triggered

    - by JD
    Can someone give me a heads up... I'm trying to use the dotRAS .NET control, and this code to change the value of internetConnected (boolean) using an event handler... But it seems that the state RasConnectionState.Disconnected is not triggered by dotRAS hangup().. Any ideas? Am I doing it totally wrong... or have I managed to find a bug? public class USBModem { // private vars private RasDialer dialer = new RasDialer(); private bool internetConnected = false; /// <summary> /// Default constructor for USBModem /// </summary> public USBModem() { // Add Events for dialer dialer.StateChanged += new EventHandler<StateChangedEventArgs>(dialer_StateChanged); } void dialer_StateChanged(object sender, StateChangedEventArgs e) { // Handle state changes here switch (e.State) { case RasConnectionState.Connected: internetConnected = true; Console.WriteLine(e.State.ToString()); break; case RasConnectionState.Disconnected: internetConnected = false; Console.WriteLine(e.State.ToString()); break; default: Console.WriteLine("INFO -> Unhandled state: " + e.State.ToString()); break; } } public void ConnectInternet(string connectionName) { // Dial dialer.PhoneBookPath = RasPhoneBook.GetPhoneBookPath(RasPhoneBookType.AllUsers); dialer.EntryName = connectionName; dialer.DialAsync(); } public void DisconnectInternet() { foreach (RasConnection connection in dialer.GetActiveConnections()) { connection.HangUp(); } } }

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  • Custom UITableViewCell won't redraw on setNeedsDisplay

    - by Andrew Portner
    I created a custom UITableViewCell class with a UIButton, a UIImage, and two UILabels. The button and the image are overlayed on top of each other, and only one is displayed at a time. The expected behavior is you touch on the button, the button disappears, and it displays the image. The UITableViewCells are set to be reused. Here's my code: Constructor: - (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier { if (self = [super initWithStyle:style reuseIdentifier:reuseIdentifier]) { unheartButton = [[UIButton buttonWithType:UIButtonTypeCustom] retain]; unheartButton.backgroundColor = [UIColor clearColor]; unheartButton.frame = CGRectMake(10, 13, 20, 18); [unheartButton addTarget:self action:@selector(onButtonClick:) forControlEvents:UIControlEventTouchUpInside]; [unheartButton setBackgroundImage:[UIImage imageNamed:@"redheart.png"] forState:UIControlStateNormal]; imageView = [[UIImageView alloc] init]; imageView.frame = CGRectMake(12, 13, 16, 16); NSMutableArray *array = [[NSMutableArray alloc] init]; for (int ndx = 1; ndx < 13; ndx++) { [array addObject:[UIImage imageNamed:[NSString stringWithFormat:@"icon-loading-%d (dragged).tiff", ndx]]]; } imageView.animationImages = array; imageView.animationDuration = 1; imageView.hidden = YES; [array release]; [self.contentView addSubview:imageView]; [self.contentView addSubview:unheartButton]; return self; } } Button click: - (IBAction) onButtonClick: (id) sender { unheartButton.hidden = YES; imageView.hidden = NO; [imageView startAnimating]; [self setNeedsDisplay]; [self.contentView setNeedsDisplay]; [self.unheartButton setNeedsDisplay]; [self.imageView setNeedsDisplay]; } I'm calling setNeedsDisplay on everything, but nothing seems to happen. If I scroll off the screen and back up, the button is hidden and now the loading icon is shown, but this only happens after a scroll. I'm not sure what I need to do to get the cell to repaint.

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  • constructing paramater query SQL - LIKE % in .cs and in grid view

    - by Indranil Mutsuddy
    Hello friends, I am trying to implement admin login and operators(india,australia,america) login, now operator id starts with 'IND123' 'AUS123' and 'AM123' when operator india logs in he can see the details of only members have id 'IND%', the same applies for an australian and american users and when admin logs in he can see details of members with id 'IND%' or 'AUS%' or 'AM%' i have a table which defines the role i.e admin or operator and their prefix(IND,AUS respectively) In loginpage i created a session for Role and prefix PREFIX = myReader["Prefix"].ToString(); Session["LoginRole"] = myReader["Role"].ToString(); Session["LoginPrefix"] = String.Concat(PREFIX + "%"); works fine In main page(after login) i have to count the number of member so i wrote string prefix = Session["LoginPrefix"].ToString(); string role = Session["LoginRole"].ToString(); if (role.Equals("ADMIN")) StrMemberId = "select count(*) from MemberList"; else StrMemberId = "select count(*) from MemberList where MemberID like '"+prefix+"'"; thatworks fine too Problem: 1. i want to constructor parameter something like StrMemberId = "select count(*) from MemberList where MemberID like '@prefix+'"; myCommd.Parameters.AddWithValue("@prefix", prefix); Which is not working 2 Displaying the members in gridview i need to give condition (something like if (role.Equals("ADMIN")) show all members else show member depending on the operator prefix)the list of members in operator mode and admin mode. - where to put the condition in gridview how to apply these please suggest something Regards Indranil

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  • WCF: Per-Call and Per-Session services...need convincing that Per-Call is worthwhile

    - by mrlane
    Hello all. We are currently doing a review of our WCF service design and one thing that is bothering me is the decision between Per-Call and Per-Session services. I believe I understand the concept behind both, but I am not really seeing the advantage of Per-Call services. I understand that the motivation for using Per-Call services is that a WCF services only holds a servier object for the life of a call thereby restricting the time that an expensive resource is held by the service instance, but to me its much simpler to use the more OO like Per-Session model where your proxy object instance always corrisponds to the same server object instance and just handle any expensive resources manually. For example, say I have a CRUD Service with Add, Update, Delete, Select methods on it. This could be done as a Per-Call service with database connection (the "expensive resource") instanciated in the server object constructor. Alternately it could be a Per-Session service with a database connection instanciated and closed within each CRUD method exposed. To me it is no different resource wise and it makes the programming model simpler as the client can be assured that they always have the same server object for their proxies: any in-expensive state that there may be between calls is maintained and no extra parameters are needed on methods to identify what state data must be retrieved by the service when it is instanciating a new server object again (as in the case of Per-Call). Its just like using classes and objects, where the same resource management issues apply, but we dont create new object instances for each method call we have on an object! So what am I missing with the Per-Call model? Thanks

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  • Time flies like an arrow demo in WinForms

    - by Benjol
    Looking at the Reactive Extensions for javascript demo on Jeff Van Gogh's blog, I thought I'd give it a try in C#/Winforms, but it doesn't seem to work so well. I just threw this into the constructor of a form (with the Rx framework installed and referenced): Observable.Context = SynchronizationContext.Current; var mousemove = Observable.FromEvent<MouseEventArgs>(this, "MouseMove"); var message = "Time flies like an arrow".ToCharArray(); for(int i = 0; i < message.Length; i++) { var l = new Label() { Text = message[i].ToString(), AutoSize = true, TextAlign = ContentAlignment.MiddleCenter }; int closure = i; mousemove .Delay(closure * 150) .Subscribe(e => { l.Left = e.EventArgs.X + closure * 15 + 10; l.Top = e.EventArgs.Y; //Debug.WriteLine(l.Text); }); Controls.Add(l); } When I move the mouse, the letters seem to get moved in a random order, and if I uncomment the Debug line, I see multiple events for the same letter... Any ideas? I've tried Throttle, but it doesn't seem to make any difference. Am I just asking too much of WinForms to move all those labels around? (Cross posted on Rx Forum)

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  • HQL Query Not Running

    - by Sarang
    select new UpdateCountDataBean(count(elements(am.actionId)) as noOfUpdates, am.pname as name) from ActivityMaster am group by am.pname The UpdateCountDataBean is created by me while the second class i.e. ActivityMaster is POJO class. java.lang.NullPointerException at org.hibernate.hql.ast.tree.MethodNode.handleElements(MethodNode.java:158) at org.hibernate.hql.ast.tree.MethodNode.resolveCollectionProperty(MethodNode.java:109) at org.hibernate.hql.ast.tree.CollectionFunction.resolve(CollectionFunction.java:22) at org.hibernate.hql.ast.HqlSqlWalker.processFunction(HqlSqlWalker.java:835) at org.hibernate.hql.antlr.HqlSqlBaseWalker.collectionFunction(HqlSqlBaseWalker.java:2558) at org.hibernate.hql.antlr.HqlSqlBaseWalker.aggregateExpr(HqlSqlBaseWalker.java:2907) at org.hibernate.hql.antlr.HqlSqlBaseWalker.count(HqlSqlBaseWalker.java:2483) at org.hibernate.hql.antlr.HqlSqlBaseWalker.selectExpr(HqlSqlBaseWalker.java:1971) at org.hibernate.hql.antlr.HqlSqlBaseWalker.aliasedSelectExpr(HqlSqlBaseWalker.java:2057) at org.hibernate.hql.antlr.HqlSqlBaseWalker.constructor(HqlSqlBaseWalker.java:2226) at org.hibernate.hql.antlr.HqlSqlBaseWalker.selectExpr(HqlSqlBaseWalker.java:1952) at org.hibernate.hql.antlr.HqlSqlBaseWalker.selectExprList(HqlSqlBaseWalker.java:1825) at org.hibernate.hql.antlr.HqlSqlBaseWalker.selectClause(HqlSqlBaseWalker.java:1394) at org.hibernate.hql.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:553) at org.hibernate.hql.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:281) at org.hibernate.hql.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:229) at org.hibernate.hql.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:228) at org.hibernate.hql.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:160) at org.hibernate.hql.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:111) at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:77) at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:56) at org.hibernate.engine.query.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:72) at org.hibernate.impl.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:133) at org.hibernate.impl.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:112) at org.hibernate.impl.SessionImpl.createQuery(SessionImpl.java:1623)

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  • Multiple overlay items in android

    - by Bostjan
    I seem to be having a problem with using ItemizedOverlay and OveralyItems in it. I can get the first overlayItem to appear on the map but not any items after that. Code sample is on: http://www.anddev.org/multiple_overlay_items-t12171.html Quick overview here: public class Markers extends ItemizedOverlay { private Context ctx; private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>(); public Markers(Drawable defaultMarker, Context cont) { super(boundCenterBottom(defaultMarker)); this.ctx = cont; // TODO Auto-generated constructor stub } @Override protected OverlayItem createItem(int i) { // TODO Auto-generated method stub return mOverlays.get(i); } @Override public boolean onTap(GeoPoint p, MapView mapView) { // TODO Auto-generated method stub return super.onTap(p, mapView); } @Override protected boolean onTap(int index) { // TODO Auto-generated method stub Toast.makeText(this.ctx, mOverlays.get(index).getTitle().toString()+", Latitude: "+mOverlays.get(index).getPoint().getLatitudeE6(), Toast.LENGTH_SHORT).show(); return super.onTap(index); } @Override public int size() { // TODO Auto-generated method stub return mOverlays.size(); } public void addOverlay(OverlayItem item) { mOverlays.add(item); setLastFocusedIndex(-1); populate(); } public void clear() { mOverlays.clear(); setLastFocusedIndex(-1); populate(); }} Markers usersMarker = new Markers(user,overview.this); GeoPoint p = new GeoPoint((int) (lat * 1E6),(int) (lon * 1E6)); OverlayItem item = new OverlayItem(p,userData[0],userData[3]); item.setMarker(this.user); usersMarker.addOverlay(item); The lines after the class are just samples of how it's used the first marker shows up on the map but if I add any more they don't show up? Is there a problem with the populate() method? I tried calling it manually after adding all markers but it still didn't help. Please, if you have any idea what could be wrong, say so.

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  • WCF - CODEGEN: Generating message contract since message FileRequest has headers

    - by Tri Q
    I am aware that there is a similar question here with no solution. I'm working on a WCF streaming service over HTTP. Here are my MessageContract [MessageContract] public class FileRequest { #region Message Header [MessageHeader(MustUnderstand = true)] public Credential Credentials { get; set; } #endregion #region Message body [MessageBodyMember(Order = 1)] public FileInfo FileInfo { get; set; } #endregion #region Ctor // ... #endregion } [MessageContract] public class FileRequestResponse { #region Message Header [MessageHeader(MustUnderstand = true)] public FileInfo FileHeader { get; set; } [MessageHeader(MustUnderstand = true)] public OperationResult<bool> OperationResult { get; set; } #endregion #region Message Body [MessageBodyMember] public Stream FileStream { get; set; } #endregion #region Constructor // ... #endregion } Here is my ServiceContract [ServiceContract(Namespace = "https://service.contract.example.com")] public interface IUpdateService { [OperationContract(Action = "GetUpdates")] OperationResult<List<FileInfo>> GetUpates(ApplicationInfo applicationInfo, Credential credential); [OperationContract(Action = "GetFile")] FileRequestResponse FileRequest(FileRequest fileRequest); } Now the question is why I am getting this error: // CODEGEN: Generating message contract since message FileRequest has headers When I add my service reference. The end result is that the service contract wraps the FileRequest operation into a wrapper which I do not want. public FileInfo FileRequest(Credential Credentials, FileInfo, out OperationResult<bool> OperationResult, out System.IO.Stream FileStream) NOTE: I have not checked the "Always generate message contracts" in the service reference.

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  • FileNotFoundException, altough the XML file should be deployed

    - by Bernhard V
    Hi, I've got problems starting my WAR application on a local JBoss. After two other EARs are deployed and the TomcatDeployer begins deploying the WAR, I'm getting the following error message: 2010-04-28 10:01:56,605 ERROR [org.jboss.ejb.plugins.LogInterceptor] [] [main] EJBException in method: public abstract at.sozvers.stp.zpv.ejb.lea.rwsuc.EJBLeaRegelwerkSuchenRemote at.sozvers.stp.zpv.ejb.lea.rwsuc.EJBLeaRegelwerkSuchenHome.create() throws javax.ejb.CreateException,java.rmi.RemoteException, causedBy: javax.ejb.EJBException: org.springframework.beans.factory.access.BootstrapException: Unable to initialize group definition. Group resource name [classpath*:applicationContext.xml], factory key [contextService]; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'contextService' defined in URL [jar:file:/C:/ta30/nutzb/jboss-4.2.3.GA.ZPV/server/default/deploy/deploy.last/zpv-app-web-frontend-1.0-SNAPSHOT.war/WEB-INF/lib/zpv-comp-ejb-modules-1.0-SNAPSHOT-client.jar!/applicationContext.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [org.springframework.context.support.ClassPathXmlApplicationContext]: Constructor threw exception; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: IOException parsing XML document from class path resource [at/sozvers/stp/zpv/dao/ContextBasic.xml]; nested exception is java.io.FileNotFoundException: class path resource [at/sozvers/stp/zpv/dao/ContextBasic.xml] cannot be opened because it does not exist The sad thing is that the resource at/sozvers/stp/zpv/dao/ContextBasic.xml actually is placed in a JAR in one of my EAR files which should be deployed before the WAR. And at least I get a message that the deployment of the EAR has been successful. I also looked into the JAR with my file archiver and the ContextBasic.xml is indeed there at the right place. Is there a way for me to get sure that the JAR, not the EAR as a whole, is really deployed to the JBoss? I'm already starting to lose my head about this issue. Thank you. Bernhard

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  • C# Assembly not found at runtime

    - by Gustavo Cardoso
    A strange error begans to happen with my XNA project on a new pc. I have two projects on the solution and a library that is used by both of them. One of the projects, a XNA Game Project, runs perfectly. The other project is a mix of WindowsForm and XNA. The form launches a XNA class when a button is clicked. When I run the program, it works great till the moment I click the button which launch the XNA class. A FileNotFoundException is fired exactly at the moment that the constructor will be executed. System.IO.FileNotFoundException was unhandled Message="Could not load file or assembly 'Microsoft.Xna.Framework, Version=3.0.0.0, Culture=neutral, PublicKeyToken=6d5c3888ef60e27d' or one of its dependencies. The system cannot find the path specified." The reference is correct, there is no problem on compilation. We already tried to delete the reference and add it again but it didn't work. Everything worked correctly in others teammate's pc. Anyone has any idea what is the problem?

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  • Making a Text-To-Speech Wrapper in Android

    - by John Montgomery
    I am attempting to create a wrapper class for Google Android's Text-To-Speech functionality. However, I'm having trouble finding a way to have the system pause until after the onInit function has finished. Attached at the bottom is something of a solution I created based on what I found here: http://stackoverflow.com/questions/1160876/android-speech-how-can-you-read-text-in-android However, this solution does not seem to work. Any thoughts on why this might not be working, or what would be a good idea in order to make sure that any Speak() calls happen after my onInit() call? public class SpeechSynth implements OnInitListener { private TextToSpeech tts; static final int TTS_CHECK_CODE = 0; private int ready = 0; private ReentrantLock waitForInitLock = new ReentrantLock(); SpeechSynth( Activity screen ) { ready = 0; tts = new TextToSpeech( screen, this ); waitForInitLock.lock(); } public void onInit(int status) { if (status == TextToSpeech.SUCCESS) { ready = 1; } waitForInitLock.unlock(); } public int Speak( String text ) { if( ready == 1 ) { tts.speak(text, TextToSpeech.QUEUE_ADD, null); return 1; } else { return 0; } } } I have been able to make it so that I can pass a string of text through the constructor, then have it played in the onInit() function. However, I would really like to avoid having to destroy and re-create the whole text-to-speech engine every time I need to have my program say something different.

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  • Friend Assemblies in C#

    - by Tim Long
    I'm trying to create some 'friend assemblies' using the [InternalsVisibleTo()] attribute, but I can't seem to get it working. I've followed Microsoft's instructions for creating signed friend assemblies and I can't see where I'm going wrong. So I'll detail my steps here and hopefully someone can spot my deliberate mistake...? Create a strong name key and extract the public key, thus: sn -k StrongNameKey sn -p public.pk sn -tp public.pk Add the strong name key to each project and enable signing. Create a project called Internals and a class with an internal property: namespace Internals { internal class ClassWithInternals { internal string Message { get; set; } public ClassWithInternals(string m) { Message = m; } } } Create another project called TestInternalsVisibleTo: namespace TestInternalsVisibleTo { static class Program { /// <summary> /// The main entry point for the application. /// </summary> [STAThread] static void Main() { var c = new Internals.ClassWithInternals("Test"); Console.WriteLine(c.Message); } } } Edit the AssemblyInfo.cs file for the Internals project, and add teh necessary attribute: [assembly: AssemblyTitle("AssemblyWithInternals")] [assembly: AssemblyDescription("")] [assembly: AssemblyConfiguration("")] [assembly: AssemblyCompany("Microsoft")] [assembly: AssemblyProduct("Internals")] [assembly: AssemblyCopyright("Copyright © Microsoft 2010")] [assembly: AssemblyTrademark("")] [assembly: AssemblyCulture("")] [assembly: ComVisible(false)] [assembly: Guid("41c590dc-f555-48bc-8a94-10c0e7adfd9b")] [assembly: AssemblyVersion("1.0.0.0")] [assembly: AssemblyFileVersion("1.0.0.0")] [assembly: InternalsVisibleTo("TestInternalsVisibleTo PublicKey=002400000480000094000000060200000024000052534131000400000100010087953126637ab27cb375fa917c35b23502c2994bb860cc2582d39912b73740d6b56912c169e4a702bedb471a859a33acbc8b79e1f103667e5075ad17dffda58988ceaf764613bd56fc8f909f43a1b177172bc4143c96cf987274873626abb650550977dcad1bb9bfa255056bb8d0a2ec5d35d6f8cb0a6065ec0639550c2334b9")] And finally... build! I get the following errors: error CS0122: 'Internals.ClassWithInternals' is inaccessible due to its protection level error CS1729: 'Internals.ClassWithInternals' does not contain a constructor that takes 1 arguments error CS1061: 'Internals.ClassWithInternals' does not contain a definition for 'Message' and no extension method 'Message' accepting a first argument of type 'Internals.ClassWithInternals' could be found (are you missing a using directive or an assembly reference?) Basically, it's as if I had not used the InternalsVisibleTo attrbute. Now, I'm not going to fall into the trap of blaming the tools, so what's up here? Anyone?

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  • New to MVVM - Best practices for seperating Data processing thread and UI Thread?

    - by OffApps Cory
    Good day. I have started messing around with the MVVP pattern, and I am having some problems with UI responsiveness versus data processing. I have a program that tracks packages. Shipment and package entities are persisted in SQL database, and are displayed in a WPF view. Upon initial retrieval of the records, there is a noticeable pause before displaying the new shipments view, and I have not even implemented the code that counts shipments that are overdue/active yet (which will necessitate a tracking check via web service, and a lot of time). I have built this with the Ocean framework, and all appears to be doing well, except when I first started my foray into multi-threading. It broke, and it appeared to break something in Ocean... Here is what I did: Private QueryThread As New System.Threading.Thread(AddressOf GetShipments) Public Sub New() ' Insert code required on object creation below this point. Me.New(ViewManagerService.CreateInstance, ViewModelUIService.CreateInstance) 'Perform initial query of shipments 'QueryThread.Start() GetShipments() Console.WriteLine(Me.Shipments.Count) End Sub Public Sub New(ByVal objIViewManagerService As IViewManagerService, ByVal objIViewModelUIService As IViewModelUIService) MyBase.New(objIViewModelUIService) End Sub Public Sub GetShipments() Dim InitialResults = From shipment In db.Shipment.Include("Packages") _ Select shipment Me.Shipments = New ShipmentsCollection(InitialResults, db) End Sub So I declared a new Thread, assigned it the GetShipments method and instanced it in the default constructor. Ocean freaks out at this, so there must be a better way of doing it. I have not had the chance to figure out the usage of the SQL ORM thing in Ocean so I am using Entity Framework (perhaps one of these days i will look at NHibernate or something too). Any information would be greatly appreciated. I have looked at a number of articles and they all have examples of simple uses. Some have mentioned the Dispatcher, but none really go very far into how it is used. Anyone know any good tutorials? Cory

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