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  • Testing fault tolerant code

    - by Robert
    I’m currently working on a server application were we have agreed to try and maintain a certain level of service. The level of service we want to guaranty is: if a request is accepted by the server and the server sends on an acknowledgement to the client we want to guaranty that the request will happen, even if the server crashes. As requests can be long running and the acknowledgement time needs be short we implement this by persisting the request, then sending an acknowledgement to the client, then carrying out the various actions to fulfill the request. As actions are carried out they too are persisted, so the server knows the state of a request on start up, and there’s also various reconciliation mechanisms with external systems to check the accuracy of our logs. This all seems to work fairly well, but we have difficult saying this with any conviction as we find it very difficult to test our fault tolerant code. So far we’ve come up with two strategies but neither is entirely satisfactory: Have an external process watch the server code and then try and kill it off at what the external process thinks is an appropriate point in the test Add code the application that will cause it to crash a certain know critical points My problem with the first strategy is the external process cannot know the exact state of the application, so we cannot be sure we’re hitting the most problematic points in the code. My problem with the second strategy, although it gives more control over were the fault takes, is I do not like have code to inject faults within my application, even with optional compilation etc. I fear it would be too easy to over look a fault injection point and have it slip into a production environment.

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  • Drupal: Views: exposed Taxonomy filter: additional functionalities

    - by Patrick
    hi! I'm using Drupal Views with an exposed filter (improved with better exposed filters module) based on taxonomy. I have a list of nodes and for each node I assigned several tags. I would like to add the following functionalities to the filter: 1 - when few tags are selected, I would like to disable all tags that are not possible to combine with the selected ones. In other terms, disable a tag if it is not visible in the filtered nodes. In this way I highlight only a subset of tags, to help the user to continue filtering the content. 2 - when I move the mouse over an article I would like to highlight the tags that are associated with such node with a different color. That is, if I selected TAGA, and the node also contains TAGB, and TAGC, I would like to highlight the last 2 tags if I move the mouse over the node. thanks

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  • Why does my adorner not re-render when the element it's applied to changes?

    - by Robert Rossney
    In a UI I'm building, I want to adorn a panel whenever one of the controls in the panel has the focus. So I handle the IsKeyboardFocusWithinChanged event, and add an adorner to the element when it gains the focus and remove the adorner when it loses focus. This seems to work OK. The problem I'm having is that the adorner isn't getting re-rendered if the bounds of the adorned element changes. For instance, in this simple case: <WrapPanel Orientation="Horizontal" IsKeyboardFocusChanged="Panel_IsKeyboardFocusChanged"> <Label>Caption</Label> <TextBox>Data</TextBox> </WrapPanel> the adorner correctly decorates the bounds of the WrapPanel when the TextBox receives the focus, but as I type in text, the TextBox expands underneath the edge of the adorner. Of course as soon as I do anything that forces the adorner to render, like ALT-TAB out of the application or give another panel the focus, it corrects itself. But how can I get it to re-render when the bounds of the adorned element change?

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  • Does Process.StartInfo.Arguments support a UTF-8 string?

    - by Patrick Klug
    Can you use a UTF-8 string as the Arguments for a StartInfo? I am trying to pass a UTF-8 (in this case a Japanese string) to an application as a console argument. Something like this (this is just an example! (cmd.exe would be a custom app)) var process = new System.Diagnostics.Process(); process.StartInfo.Arguments = "/K \"echo ????????\""; process.StartInfo.FileName = "cmd.exe"; process.StartInfo.UseShellExecute = true; process.Start(); process.WaitForExit(); Executing this seems to loose the UTF-8 string and all the target application sees is "echo ?????????" When executing this command directly on the command line (by pasting the arguments) the target application receives the string correctly even though the command line itself doesn't seem to display it correctly. Do I need to do anything special to enable UTF-8 support in the arguments or is this just not supported?

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  • Where are classpath, path and pathelement documented in Ant version 1.8.0?

    - by Robert Menteer
    I'm looking over the documentation that comes with Apache Ant version 1.8.0 and can't find where classpath, path and pathelement are documented. I've found a page that describes path like structures but it doesn't list the valid attributes or nested elements for these. Another thing I can't find in the documentation is a description of the relationships between filelist, fileset, patternset and path and how to convert them back and forth. For instance there has to be an easier way to compile only those classes in one package while removing all class dependencies on the package classes and update documentation. <!-- Get list of files in which we're interested. --> <fileset id = "java.source.set" dir = "${src}"> <include name = "**/Package/*.java" /> </fileset> <!-- Get a COMMA separated list of classes to compile. --> <pathconvert property = "java.source.list" refid = "java.source.set" pathsep = ","> <globmapper from = "${src}/*.@{src.extent}" to = "*.class" /> </pathconvert> <!-- Remove ALL dependencies on package classes. --> <depend srcdir = "${src}" destdir = "${build}" includes = "${java.source.list}" closure = "yes" /> <!-- Get a list of up to date classes. --> <fileset id = "class.uptodate.set" dir = "${build}"> <include name = "**/*.class" /> </fileset> <!-- Get list of source files for up to date classes. --> <pathconvert property = "java.uptodate.list" refid = "class.uptodate.set" pathsep = ","> <globmapper from="${build}/*.class" to="*.java" /> </pathconvert> <!-- Compile only those classes in package that are not up to date. --> <javac srcdir = "${src}" destdir = "${build}" classpathref = "compile.classpath" includes = "${java.source.list}" excludes = "${java.uptodate.list}"/> <!-- Get list of directories of class files for package. --: <pathconvert property = "class.dir.list" refid = "java.source.set" pathsep = ","> <globmapper from = "${src}/*.java" to = "${build}*" /> </pathconvert> <!-- Convert directory list to path. --> <path id = "class.dirs.path"> <dirset dir = "${build}" includes = "class.dir.list" /> </path> <!-- Update package documentation. --> <jdepend outputfile = "${docs}/jdepend-report.txt"> <classpath refid = "compile.classpath" /> <classpath location = "${build}" /> <classespath> <path refid = "class.dirs.path" /> </classespath> <exclude name = "java.*" /> <exclude name = "javax.*" /> </jdepend> Notice there's a number of conversions between filesets, paths and comma separated list just to get the proper 'type' required for the different ant tasks. Is there a way to simplify this while still processing the fewest files in a complex directory structure?

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  • Is is possible to programmatically change the resourceProviderFactoryType?

    - by Robert Massa
    I have a custom implementation of IResourceProvider and ResourceProviderFactory. Now the default way of making sure ASP.NET uses these custom types is to use the web.config and specify the factory like so: <globalization resourceProviderFactoryType="Product.Globalization.TranslationResourceProviderFactory" /> This works perfectly, except that in my resource provider I need database access. I want to use my IoC-container(Ninject) to inject the repositories needed to access this data into the CustomResourceProvider. But how am I going to do this? I have no control over the instantiation of the factory, so the factory can't get a reference to my IoC. Is there any way to register a custom provider programmatically, in for example the Global.asax?

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  • Android MediaStore insertVideo

    - by Robert
    So our app has the option to take either a picture or a video. If the user takes a picture, we can use the MediaStore.Images.Media.insertImage function to add the new image (via a filepath) to the phone's gallery and generate a content:// style URI. Is there a similar process for a captured video, given that we only have it's filepath?

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  • Recursive XML through XSLT to XML

    - by Patrick
    Essentially, I have XML structured like this: <A> <B> <1>data</1> <2>data</2> <C> <1>data</1> <2>data</2> <B> <1>data</1> <2>data</2> <C> <B> <1>data</1> <2>data</2> </B> </C> </B> <B> <1>data</1> <2>data</2> </B> </C> </B> </A> I am trying to get the output to look like this: <A> <B 1="data" 2="data"> <C 1="data" 2="data"> <B 1="data" 2="data"> <C> <B 1="data" 2="data" > </B> </C> </B> <B 1="data" 2="data" > </B> </C> </B> </A> I have figured out how to put everything as attributes and start looping through the elements. The issue I am facing is that when trying to get below the first C, nothing happens. Here is my code: <?xml version="1.0" encoding="utf-8"?> <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:msxsl="urn:schemas-microsoft-com:xslt" exclude-result-prefixes="msxsl"> <xsl:output method="xml" indent="yes"/> <xsl:template match="/"> <MenuDataResult> <B> <xsl:apply-templates /> </B> </MenuDataResult> </xsl:template> <xsl:template match="B"> <xsl:for-each select="B"> <B ItemID="{B/ItemID/text()}" ItemType="{ItemType/text()}" ItemSubType="{ItemSubType/text()}" ItemTitle="{ItemTitle/text()}" ItemImage="{ItemImage/text()}" ItemImageOverride="{ItemImageOverride/text()}" ItemLink="{ItemLink/text()}" ItemTarget="{ItemTarget/text()}>"> <xsl:for-each select="C"> <xsl:apply-templates select="C"/> </xsl:for-each> </B> </xsl:for-each> </xsl:template> <xsl:template match="C"> <C ID="{ID/text()}" Title="{Title/text()}" Template="{Template/text()}" Type="{Type/text()}" Link="{Link/text()}" ParentID="{ParentID/text()}" AncestorID="{AncestorID/text()}" FolderID="{FolderID/text()}" Description="{Description/text()}" Image="{Image/text()}" ImageOverride="{ImageOverride/text()}"> <xsl:for-each select="B"> <xsl:apply-templates select=".//B"/> </xsl:for-each> </C> </xsl:template> </xsl:stylesheet>

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  • Sharepoint Foundation 2010 installation problems

    - by Robert Koritnik
    I'm having problems installing development machine for Sharepoint (Foundation) 2010. This is what I did so far on the same machine: Installed a clean Windows 7 x64 with 4GB of RAM without being part of any domain. Just a simple standalone machine. Enabled IIS related features as described here except IIS6 related ones (two of them) Installed SQL Server 2008 R2 Development Edition (DB Engine and Writer being enabled but not SQL Agent) Installed Visual Studio 2010 Premium Started installing Sharepoint Foundation 2010 with first extracting files, changing config to enable Windows 7 installation and then installed it as Server Farm (then Complete) to avoid installing SQL Express. Created a separate SPF_CONFIG local user with Logon on as a service right. Opened SPF Management Shell and run New-SPConfigurationDatabase so I am able to use a non-domain username (SPF_CONFIG that I created in the previous step) But all I get is this: The outcome after this error is: Database Sharepoint2010Config is created User SPF_CONFIG is added to SQL Server and attached to this newly created database as dbowner and checking SQL server security logins this user has following rights: dbcreator securityadmin public

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  • Qt moc failure without an error message

    - by Robert Parker
    So I'm pretty new to Qt, and I've just inherited a project from someone else who is also new to Qt. He isn't around this week btw. We are using Visual Studio 2008, and have the latest version of Qt installed(4.6.2). The project builds on my coworker's machine fine, and I can get the project from svn and build it directly. But under any other circumstances it refuses to build on my machine, and it doesn't give me much of an explanation why. Even if I just do a 'build clean' and then a 'build' it doesn't work. Any slight modification will make it fail. When I try to build the entire project I get the error message: 1Moc'ing MatrixTypeInterface.h... 1moc: Cannot create .\GeneratedFiles\Debug\moc_MatrixTypeInterface.cpp;.\GeneratedFiles\Debug\moc_matrixtypeinterface.cpp 1Project : error PRJ0019: A tool returned an error code from "Moc'ing MatrixTypeInterface.h..." The moc tool doesn't give any sort of error message as to why it isn't working, and I wasted most of yesterday trying to figure out why. I got the command that VS was using to call moc, and I entered in the command line myself. It didn't write anything to the screen. Any ideas?

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  • Asp.net MVC error with custom HttpModule

    - by Robert Koritnik
    I have a custom authentication HttpModule that is pretty strait forward. But I want it to run only for managed requests (and not for static ones). Asp.net MVC automatically adds configuration section for IIS7 web server: <system.webServer> <validation validateIntegratedModeConfiguration="false" /> <modules runAllManagedModulesForAllRequests="true"> <remove name="ScriptModule" /> <remove name="UrlRoutingModule" /> <add name="ScriptModule" preCondition="managedHandler" type="System.Web.Handlers.ScriptModule,..." /> <add name="UrlRoutingModule" type="System.Web.Routing.UrlRoutingModule,..." /> </modules> <handlers> ... </handlers> </system.webServer> When I add my own module I also set its preCondition="managedHandler", but since there's runAllManagedModulesForAllRequests="true" on parent <module> element my preCondition is ignored by design (as I read on MSDN). When I try to set though: <modules runAllManagedModulesForAllRequests="false"> I get this error: [image no longer valid] What else (which other module) do I have to set in web.config to make it work with this setting: <modules runAllManagedModulesForAllRequests="false">

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  • a facebook app question

    - by Robert
    I have written a small app and put it on facebook. I got an application ID and secret. Then I wrote the following script to access my app (just as told on the facebook page). <?php require './src/facebook.php'; $facebook = new Facebook(array( 'appId' => 'xxxx', 'secret' => 'xxxx', 'cookie' => true, // enable optional cookie support )); try { $me = $facebook->api('/me'); } catch (FacebookApiException $e) { error_log($e); } if ($facebook->getSession()) { echo '<a href="' . $facebook->getLogoutUrl() . '">Logout</a>'; } else { echo '<a href="' . $facebook->getLoginUrl() . '">Login</a>'; } ?> Then I started running this script. It prompted me with the login link, then took me to the facebook login page. However, after I enter my facebook login details, I get this error page: Error. API Error Code: 100 API Error Description: Invalid parameter Error Message: next is not owned by the application. Could anyone help me a little bit please, I am really confused here about what's going on.

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  • using fopen on uploaded file with php

    - by Patrick
    Im uploading a file, and then attempting to use fgetcsv to do things to it. This is my script below. Everything was working fine before i added the file upload portions. Now its not showing any errors, its just not displaying the uploaded data. Im getting my "file uploaded" notice, and the file is saving properly, but the counter for number of entries is showing 0. if(isset($_FILES[csvgo])){ $tmp = $_FILES[csvgo][tmp_name]; $name = "temp.csv"; $tempdir = "csvtemp/"; if(move_uploaded_file($tmp, $tempdir.$name)){ echo "file uploaded<br>"; } $csvfile = $tempdir.$name; $fh = fopen($csvfile, 'r'); $headers = fgetcsv($fh); $data = array(); while (! feof($fh)) { $row = fgetcsv($fh); if (!empty($row)) { $obj = new stdClass; foreach ($row as $i => $value) { $key = $headers[$i]; $obj->$key = $value; } $data[] = $obj; } } fclose($fh); $c=0; foreach($data AS $key){ $c++; $phone = $key->PHONE; $fax = $key->Fax; $email = $key->Email; // do things with the data here } echo "$c entries <br>"; }

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  • Working with a CSV file with odd encapsulation // PHP

    - by Patrick
    I have a CSV file that I'm working with, and all the fields are comma separated. But some of the fields themselves, contain commas. In the raw CSV file, the fields that contain commas, are encapsulated with quotes, as seen here; "Doctor Such and Such, Medical Center","555 Scruff McGruff, Suite 103, Chicago IL 60652",(555) 555-5555,,,,something else the code I'm using is below <?PHP $file_handle = fopen("file.csv", "r"); $i=0; while (!feof($file_handle) ) { $line = fgetcsv($file_handle, 1024); $c=0; foreach($line AS $key=>$value){ if($i != 0){ if($c == 0){ echo "[ROW $i][COL $c] - $value"; //First field in row, show row # }else{ echo "[COL $c] - $value"; // Remaining fields in row } } $c++; } echo "<br>"; // Line Break to next line $i++; } fclose($file_handle); ?> The problem is I'm getting the fields with the commas split into two fields, which messes up the number of columns I'm supposed to have. Is there any way I could search for commas within quotes and convert them, or another way to deal with this?

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  • Binding to XMLDataProvider in Code Behind

    - by Robert Vernunft
    Hello, i have a problem moving a XMLDataprovider Binding with XPath from Xaml to code behind. Labels.xml <?xml version="1.0" encoding="utf-8" ?> <Labels> <btnOne Label="Button1"/> <btnTwo Label="Button2"/> </Labels> MainWindow.xaml <Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" x:Class="bindings.MainWindow" Title="MainWindow" Height="350" Width="525"> <Window.Resources> <XmlDataProvider x:Key="XMLLabels" Source="Labels.xml" XPath="Labels"/> </Window.Resources> <Grid> <Button Content="{Binding Source={StaticResource XMLLabels}, XPath=btnOne/@Label}" Height="23" HorizontalAlignment="Left" Margin="12,12,0,276" Name="btnOne" Width="75" /> <Button Content="Button" Height="23" HorizontalAlignment="Left" Margin="93,12,0,276" Name="btnTwo" Width="75" Loaded="btnTwo_Loaded" /> </Grid> </Window> MainWindow.xaml.cs ... private void btnTwo_Loaded(object sender, RoutedEventArgs e) { String Type = sender.GetType().Name; if (Type == "Button") { Button btn = sender as Button; Binding label = new Binding("XMLBind"); XmlDataProvider xmlLabels = (XmlDataProvider)this.FindResource("XMLLabels"); label.Source = xmlLabels; label.XPath = "btnTwo/@Header"; btn.SetBinding(Button.ContentProperty, label); } } ... The binding to content of btnOne works as aspected "Button1". But btnTwo is set to an empty string. The Output shows no errors. Thanks for any advice.

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  • Bulk Insert takes 4x as long on first operation of the day

    - by patrick
    I do Bulk Inserts into a table with about 14 million rows at fiver minute increments during a 7 hour period during the day. These inserts take somewhere between 9-14 secs. However, the first insert always takes about 40 secs. Anyone know what SQL Server 2005 would be doing differently on the first insert into a table for that day? From what I've read I should probably use the SqlBulkCopy class instead of just using a bulk insert in a stored procedure. Is that that the general consensus?

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  • How can I get MTK development platform for MT series mobiles with English explanation?

    - by Robert
    You said in a post that you are an engineer and you have MTK development platform for MT series mobiles with English explanation. Can you please tell me how your company obtained it? Did you purchase it from MTK or you downloaded it? If you downloaded it please tell me your source. I am researching how i can develop application in the MTK platform so i hope you could help me with this information.

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  • Including hibernate jar dependencies in ant build

    - by Patrick
    Hi, I'm trying to compile a runnable jar-file for a project that makes use of hibernate. I'm trying to construct an ant build.xml file to streamline my build process, but I'm having troubles with the inclusion of the hibernate3.jar inside the final jar-file. If I run the ant script I manage to include all my library jars, and they are put in the final jar-file's root. When I run the jar-file I get a java.lang.NoClassDefFoundError: org/hibernate/Session error. If I make use of the built-in export to jar in Eclipse, it works only if I choose "extract required libraries into jar". But that bloats the jar, and includes too much of my project (i.e. unit tests). Below is my generated manifest: Manifest-Version: 1.0 Main-Class: main.ServerImpl Class-Path: ./ antlr-2.7.6.jar commons-collections-3.1.jar dom4j-1.6.1.jar hibernate3.jar javassist-3.9.0.GA.jar jta-1.1.jar slf4j-api-1.5.11.jar slf4j-simple-1.5.11.jar mysql-connector-java-5.1.12-bin.jar rmiio-2.0.2.jar commons-logging-1.1.1.jar And the part of the build.xml looks like this: <target name="dist" depends="compile" description="Generates the Distribution Jar(s)"> <mkdir dir="${dist.dir}" /> <jar destfile="${dist.dir}/${dist.file.name}.jar" basedir="${build.prod.dir}" filesetmanifest="mergewithoutmain"> <manifest> <attribute name="Main-Class" value="${main.class}" /> <attribute name="Class-Path" value="./ ${manifest.classpath} " /> <attribute name="Implementation-Title" value="${app.name}" /> <attribute name="Implementation-Version" value="${app.version}" /> <attribute name="Implementation-Vendor" value="${app.vendor}" /> </manifest> <zipfileset refid="hibernatefiles" /> <zipfileset refid="slf4jfiles" /> <zipfileset refid="mysqlfiles" /> <zipfileset refid="commonsloggingfiles" /> <zipfileset refid="rmiiofiles" /> </jar> </target> The refids' for the zipfilesets point to the directories in a library directory lib in the root of the project. The manifest.classpath-variable takes the classpath of all those library jar-files, and flattens them with pathconvert and mapper. I've also tried to set the manifest classpath to ".", "./" and only the library jar, but to no difference at all. I'm hoping there's a simple remedy to my problems...

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  • Common Wpf pitfalls

    - by Patrick Klug
    I want to gather a list of WPF pitfalls. Issues with WPF that are not that well known and either have some serious design consequences or some major inconveniences. One topic per answer. List: Mouse.GetPosition() does not always return a correct value. The Wpf layout recursion limit is hard coded to 255.

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  • Why do I get a NullReferenceException when using a style on a ContentPresenter?

    - by Robert Rossney
    I've created this template, which uses a style applied to the ContentPresenter so that I can bind the data object's Column property to Grid.Column, allowing the items to determine for themselves which column of the Grid they go into: <DataTemplate DataType="{x:Type local:MyObject}"> <ItemsControl ItemsSource="{Binding Items}"> <ItemsControl.Resources> <Style TargetType="{x:Type ContentPresenter}"> <Setter Property="Grid.Column" Value="{Binding Column}" /> </Style> </ItemsControl.Resources> <ItemsControl.ItemsPanel> <ItemsPanelTemplate> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition Width="*" /> <ColumnDefinition Width="*" /> <ColumnDefinition Width="*" /> </Grid.ColumnDefinitions> </Grid> </ItemsPanelTemplate> </ItemsControl.ItemsPanel> </ItemsControl> </DataTemplate> When I run the program, I get a NullReferenceException. The beginning of the hilariously long stack trace: at System.Windows.StyleHelper.ApplyAutoAliasRules(OptimizedTemplateContent optimizedTemplateContent, HybridDictionary childIndexFromChildID, FrameworkTemplate frameworkTemplate, FrugalStructList`1& childRecordFromChildIndex, FrugalStructList`1& triggerSourceRecordFromChildIndex, FrugalStructList`1& resourceDependents, HybridDictionary& dataTriggerRecordFromBinding, Boolean& hasInstanceValues) at System.Windows.StyleHelper.ProcessTemplateContent(FrameworkTemplate frameworkTemplate, FrugalStructList`1& childRecordFromChildIndex, FrugalStructList`1& triggerSourceRecordFromChildIndex, FrugalStructList`1& resourceDependents, ItemStructList`1& eventDependents, HybridDictionary& dataTriggerRecordFromBinding, HybridDictionary childIndexFromChildID, Boolean& hasInstanceValues) at System.Windows.StyleHelper.SealTemplate(FrameworkTemplate frameworkTemplate, Boolean& isSealed, FrameworkElementFactory templateRoot, TriggerCollection triggers, ResourceDictionary resources, HybridDictionary childIndexFromChildID, FrugalStructList`1& childRecordFromChildIndex, FrugalStructList`1& triggerSourceRecordFromChildIndex, FrugalStructList`1& containerDependents, FrugalStructList`1& resourceDependents, ItemStructList`1& eventDependents, HybridDictionary& triggerActions, HybridDictionary& dataTriggerRecordFromBinding, Boolean& hasInstanceValues, EventHandlersStore& eventHandlersStore) at System.Windows.FrameworkTemplate.Seal() at System.Windows.StyleHelper.UpdateTemplateCache(FrameworkElement fe, FrameworkTemplate oldTemplate, FrameworkTemplate newTemplate, DependencyProperty templateProperty) at System.Windows.Controls.ContentPresenter.OnTemplateChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) at System.Windows.DependencyObject.OnPropertyChanged(DependencyPropertyChangedEventArgs e) at System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e) at System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args) ...etc. It's not the binding. I still get the error if I explicitly set the value in the style's setter to 0, say. And the error vanishes if I remove the style, though then all of the items end up in column 0. What's going on here? And how do I debug a problem like this?

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  • Why can't I Bind a viewmodel property to a dependency property of a custom control

    - by Robert
    I want to use a color picker in my wpf application and I saw a nice looking one on this codeproject page. The control works fine until I want to connect the control to a viewmodel. I created a small test program with this viewmodel: public class ColorViewModel : ViewModelBase { public ColorViewModel() { LineColor = Brushes.Yellow; } SolidColorBrush _brushColor; public SolidColorBrush LineColor { get { return _brushColor; } set { _brushColor = value; RaisePropertyChanged(() => LineColor); } } } The test program has a textbox and the colorpicker controls: <StackPanel Orientation="Horizontal"> <TextBlock Text="Please Select a Color" FontWeight="Bold" Margin="10" Foreground="{Binding Path=LineColor, UpdateSourceTrigger=PropertyChanged}"/> <vw:ColorPickerControlView x:Name="ForeColorPicker" Margin="10" CurrentColor="{Binding Path=LineColor, UpdateSourceTrigger=PropertyChanged }"/> </StackPanel> In the loaded event of the window I set the viewmodel to the datacontext like this: DataContext = new ColorViewModel(); The problem is that I can't seem to bind the LineColor property of the viewmodel to the CurrentColor property of the ColorPickerControlView. The CurrentControl property of the ColorPickerControlView seems to be fine. The constructor looks like this: public ColorPickerControlView() { this.DataContext = this; InitializeComponent(); CommandBindings.Add(new CommandBinding(SelectColorCommand, SelectColorCommandExecute)); } In the constructor of the UserControl there is the line this.DataContext = this; I read that is is necessary to bind the dependency properties. Do I override this line when I set my viewmodel to the datacontext and is that why I can't bind to the CurrentColor property? Is there any workaround? Or did I make another mistake?

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  • Bind postback data from a strong type view of type List<T>

    - by Robert Koritnik
    I have a strong type view of type List<List<MyViewModelClass>> The outer list will always have two lists of List<MyViewModelClass>. For each of the two outer lists I want to display a group of checkboxes. Each set can have an arbitrary number of choices. My view model class looks similar to this: public class MyViewModelClass { public Area Area { get; set; } public bool IsGeneric { get; set; } public string Code { get; set; } public bool IsChecked { get; set; } } So the final view will look something like: Please select those that apply: First set of choices: x Option 1 x Option 2 x Option 3 etc. Second set of choices: x Second Option 1 x Second Option 2 x Second Option 3 x Second Option 4 etc. Checkboxes should display MyViewModelClass.Area.Name, and their value should be related to MyViewModelClass.Area.Id. Checked state is of course related to MyViewModel.IsChecked. Question I wonder how should I use Html.CheckBox() or Html.CheckBoxFor() helper to display my checkboxes? I have to get these values back to the server on a postback of course. I would like to have my controller action like one of these: public ActionResult ConsumeSelections(List<List<MyViewModelClass>> data) { // process data } public ActionResult ConsumeSelections(List<MyViewModelClass> first, List<MyViewModelClass> second) { // process data } If it makes things simpler, I could make a separate view model type like: public class Options { public List First { get; set; } public List Second { get; set; } } As well as changing my first version of controller action to: public ActionResult ConsumeSelections(Options data) { // process data }

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