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• IQueryable<T> Extension Method not working

  - by Micah

  How can i make an extension method that will work like this public static class Extensions<T> { public static IQueryable<T> Sort(this IQueryable<T> query, string sortField, SortDirection direction) { // System.Type dataSourceType = query.GetType(); //System.Type dataItemType = typeof(object); //if (dataSourceType.HasElementType) //{ // dataItemType = dataSourceType.GetElementType(); //} //else if (dataSourceType.IsGenericType) //{ // dataItemType = dataSourceType.GetGenericArguments()[0]; //} //var fieldType = dataItemType.GetProperty(sortField); if (direction == SortDirection.Ascending) return query.OrderBy(s => s.GetType().GetProperty(sortField)); return query.OrderByDescending(s => s.GetType().GetProperty(sortField)); } } Currently that says "Extension methods must be defined in a non-generic static class". How do i do this?

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• NotifyCollectionChangedAction.Add?

  - by Mark

  I'm getting this exception Constructor supports only the 'Reset' action. On the last line of this function public void Enqueue(TValue val, TPriority pri = default(TPriority)) { ++count; if (!dict.ContainsKey(pri)) dict[pri] = new Queue<TValue>(); dict[pri].Enqueue(val); OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add)); } I can guess how to fix it, but I don't understand what's causing it. I'm adding an item to my collection. Should I not be using the Add action?

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• LINQ, "Argument types do not match" error, what does it mean, how do I address it?

  - by Biff MaGriff

  Hello, I'm new to linq and I'm trying to databind to an anonymous type. I'm using SubSonic 3.0 as my DAL. I'm doing a select from 2 tables like so var myDeal = (from u in db.Users select new { UserID = u.UserID, UserRoleID = (from ur in u.UserRoles where u.UserRoleID == ur.UserRoleID select ur).FirstOrDefault().UserRoleID }); foreach (var v in myDeal) //dies first time here { } Then when I databind or try to iterate through the collection I get the "Argument types do not match" error during run time. I'm not sure what is going on here.

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• JUnit Parameterized Runner and mvn Surefire Report integration

  - by fraido

  I'm using the Junit Parameterized Runner and the Maven Plugin Surefire Report to generate detailed reports during the mvn site phase. I've something like this @RunWith(Parameterized.class) public class MyTest { private String string1; private String string2; @Parameterized.Parameters public static Collection params() { return Arrays.asList(new String[][] { { "1", "2"}, { "3", "4"}, { "5", "6"} }); } public MyTest(String string1, String string2) { this.string1 = string1; this.string2 = string2; } @Test public void myTestMethod() { ... } @Test public void myOtherTestMethod() { ... } The report shows something like myTestMethod[0] 0.018 myTestMethod[1] 0.009 myTestMethod[2] 0.009 ... myOtherTestMethod[0] 0.018 myOtherTestMethod[1] 0.009 myOtherTestMethod[2] 0.009 ... Is there a way to display something else rather than the iteration number [0]..[1]..etc.. The constructor parameters would be a much better information. For example myTestMethod["1", "2"] 0.018 ...

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• Binding Listbox ItemsSource to property of ViewModel in DataContext in WPF

  - by joshperry

  I have a simple ViewModel like: public class MainViewModel { public MainViewModel() { // Fill collection from DB here... } public ObservableCollection<Projects> ProjectList { get; set; } } I set the window's DataContext to a new instance of that ViewModel in the constructor: public MainWindow() { this.DataContext = new MainViewModel(); } Then in the Xaml I am attempting to bind the ItemsSource of a ListBox to that ProjectList property. Binding just ItemsSource like so doesn't work: <ListBox ItemsSource="{Binding ProjectList}" ItemTemplate="..." /> But if I first rebase the DataContext this works: <ListBox DataContext="{Binding ProjectList}" ItemsSource="{Binding}" ItemTemplate="..." /> Shouldn't the first method work properly? What am I doing wrong?

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• ASP.NET MVC:Why does the CheckBoxFor render an additional input tag and how can I get the value usin

  - by Nikron

  Hi, In my ASP.NET MVC app I am rendering out a checkbox using the following code: <%= Html.CheckBoxFor(i=>i.ReceiveRSVPNotifications) %> Now I see that this renders both the checkbox input tag and a hidden input tag. The problem that I am having is when I try retrieve the value from the checkbox using the FormCollection: FormValues["ReceiveRSVPNotifications"] I get the value "true,false". When looking at the rendered out HTML I can see the following: <input id="ReceiveRSVPNotifications" name="ReceiveRSVPNotifications" value="true" type="checkbox"> <input name="ReceiveRSVPNotifications" value="false" type="hidden"> So the FormValues collection seems to join these two values since they have the same name. Any Ideas?

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• WPF Binding to DataRow Columns

  - by Trindaz

  Hi, I've taken some sample code from http://sweux.com/blogs/smoura/index.php/wpf/2009/06/15/wpf-toolkit-datagrid-part-iv-templatecolumns-and-row-grouping/ that provides grouping of data in a WPF DataGrid. I'm modifying the example to use a DataTable instead of a Collection of entities. My problem is in translating a binding declaration {Binding Parent.IsExpanded}, which works fine where Parent is a reference to an entity that has the IsExpanded attribute, to something that will work for my weakly typed DataTable, where Parent is the name of a column and references another DataRow in the same DataTable. I've tried declarations like {Binding Parent.Items[IsExpanded]} and {Binding Parent("IsExpanded")} but none of these seem to work. How can I create a binding to the IsExpanded column of the DataRow Parent in my DataTable? Thanks in advance, Dave

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• TFS - Rebinding solution to new TFS when prior TFS no longer available

  - by MikeMalter

  The prior instance of TFS I was using is no longer available and I have a test project I want to bind to the new instance of TFS. However, when I try to add the solution to source control, the error message tells me that the collection is not available on the server. I have deleted all old source control files, and it still has the old bindings somewhere. Does anyone know how to remove ALL bindings so I can just simply start over again with a new instance of TFS? Thanks.

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• ASP.NET MVC - ValidationMessageFor

  - by Murat

  Hi, I have asked this question on asp.net forums (http://forums.asp.net/t/1545006.aspx) but i had no valid answer therefore i'll try this here as well. I was working on migrating MVC1 app to MVC2 today and i have come across a problem while changing the ValidationMessage to ValidationMessageFor implementation. The below is the selectlist in my View <%=Html.DropDownListFor(model => model.SecurityQuestions[0].Question, "Some Security question", new { @class = "form_element_select" })%> The below code works fine and i can see the validation message came from modelstate. <%= Html.ValidationMessage("SecurityQuestions_0__Question")%> but this one does not work: <%= Html.ValidationMessageFor(model => model.SecurityQuestions[0].Question)%> SecurityQuestions is a generic list in my model public List<SecurityQuestion> SecurityQuestions { get; set; } Is this somewhat a bug in "ValidationMessageFor" or am i missing something here?

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• Multiple Silverlight Unit Test Projects in Solution

  - by IUnknown

  I am building out a number of Silverlight 4.0 libraries that are part of the same solution. I like to break them into separate projects and have a Unit Test project for each: SolutionX -LibraryProject1 ---Class1.cs ---Class2.cs -LibraryProject1.Test ---Tests1.cs ---Tests2.cs -LibraryProject2 ---Class1.cs ---Class2.cs ---CLass3.cs -LibraryProject2.Test ---Tests1.cs ---Tests2.cs ---Tests3.cs -LibraryProject3 ---Class1.cs -LibraryProject3.Test ---Tests1.cs This works great when using VS regular test projects and infrastructure because I can create and execute list of test that are aggregated from each Test project. But with the Silverlight Unit Test Framework since the Silverlight Unit Test Project must be the "start up project" I cannot figure how to run a collection of tests from each test project in one go. I have to run each separately then switch the starting project each time. I would prefer to avoid create complex build scripts or build definitions - is there a way to run all the tests at once? -Thanks

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• How to parse Json object in ASP classic passed from jQuery

  - by Michael Itzoe

  Using a jQuery dialog, on clicking OK I call $.post( "save.asp", { id: 1, value: "abcxyz" } ); to pass the values to my ASP classic file that will update the database. I don't need a return value (unless it fails). I'm a relative noob to jQuery, so I'm assuming I'm using JSON to pass the values to the ASP file. I just don't know what to do with them in ASP (using VBScript). I've seen things like ASP Extreme, but I'm not clear on how to use them. I've tried referencing values via the Request collection, but no luck. All I want to do is take the values passed, parse them out, then save them to the database. Sorry if this is a duplicate, but this just isn't clicking for me.

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• DataContractSerializer case-insensitive datamember bug

  - by Andrew Bullock

  Here is my class: [DataContract] public class EventIndex : IExtensibleDataObject { public ExtensionDataObject ExtensionData { get; set; } [DataMember] private readonly IList<EventDescription> events; public IEnumerable<EventDescription> Events { get { return events; } } public EventIndex() { events = new List<EventDescription>(); } } As you can see, events is marked as a member. When I try and deserialize one of these classes, ReadObject throws a NullReferenceException. After a morning spent inside reflector, it turns out that its trying to deserialize the events collection into the Events getter. If I rename one of the members (events\ Events) I don't have an issue. Is there a way to make this work properly, without renaming workarounds or other such nonsense?

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• Convert WMI CimType to System.Type

  - by Anonymous Coward

  I am trying to write a generic extension to turn a ManagementObjectCollection into a DataTable. This is just to make things easier for a startup script/program I am writing. I have ran into a problem with CimType. I have included the code I have written so far below. public static DataTable GetData(this ManagementObjectCollection objectCollection) { DataTable table = new DataTable(); foreach (ManagementObject obj in objectCollection) { if (table.Columns.Count == 0) { foreach (PropertyData property in obj.Properties) { table.Columns.Add(property.Name, property.Type); } } DataRow row = table.NewRow(); foreach (PropertyData property in obj.Properties) { row[property.Name] = property.Value; } table.Rows.Add(row); } return table; } } I have found the a method which I think will work at http://www.devcow.com/blogs/adnrg/archive/2005/09/23/108.aspx. However it seems to me like there may be a better way, or even a .net function I am overlooking.

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• Npgsql pass parameters by name to a stored function

  - by Jeff

  I'm working with code I'm converting to Pgsql working with .NET. I want to call a stored function that has several parameters, but I'd like to bind the parameters by name, like so: NpgsqlCommand command = new NpgsqlCommand("\"StoredFunction\"", _Connection) command.CommandType = CommandType.StoredProcedure; command.Parameters.Add("param2", value2); command.PArameters.Add("param1", value1); Attempts to do this so far look for a function with parameter types matching in the order in which I added the parameters to the collection, not by name. Is it possible for Npgsql to bind parameters to stored functions by name?

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• Regex to leave desired string remaining and others removed

  - by m7d

  In Ruby, what regex will strip out all but a desired string if present in the containing string? I know about /[^abc]/ for characters, but what about strings? Say I have the string "group=4&type_ids[]=2&type_ids[]=7&saved=1" and want to retain the pattern group=\d, if it is present in the string using only a regex? Currently, I am splitting on & and then doing a select with matching condition =~ /group=\d/ on the resulting enumerable collection. It works fine, but I'd like to know the regex to do this more directly.

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• Could not load type 'System.Web.Mvc.ViewUserControl<SOMETYPE>'.

  - by Evgenyt

  I'm trying to deploy ASP.NET MVC 2 project (VS2010) to Win Server 2008 R2 It works perfectly on dev machine. But strange error occurs at Server 2008 R2: When .ascx file has header that uses generic type: <%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<MyProj.Web.Models.RangeViewModel>" %> Server reports Could not load type 'System.Web.Mvc.ViewUserControl<MyProj.Web.Models.RangeViewModel>'. But when I declare somewhere in .cs file type like public class AA : System.Web.Mvc.ViewUserControl<MyProj.Web.Models.RangeViewModel> { } and use it instead in <%@ Control header. Then it works as it should. Am I missing something?

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• What's the best way to handle the same shortcut in WPF and WinForms controls?

  - by Anthony Brien

  I have a WPF application with the following KeyBinding on its main window: <KeyBinding Command="Commands:EditCommands.Undo" Gesture="CTRL+Z" /> <KeyBinding Command="Commands:EditCommands.Redo" Gesture="CTRL+Y" /> This makes the command respond to the shortcut fine. However, in all the places where I have embedded WinForms text boxes or rich text boxes, I've lost the ability to use those shortcuts. If I remove the above bindings, the WinForms shortcuts work fine. How can I support these shortcuts in both WinForms and WPF? I'd prefer a generic method since this problem is likely to affect many other commands with the same keybindings.

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• C# How can I tell if an IEnumerable is Mutable?

  - by Logan

  I want a method to update certain entries of an IEnumerable. I found that doing a foreach over the entries and updating the values failed as in the background I was cloning the collection. This was because my IEnumerable was backed by some LINQ-SQL queries. By changing the method to take a List I have changed this behavior, Lists are always mutable and hence the method changes the actual objects in the list. Rather than demand a List is passed is there a Mutable interface I can use? // Will not behave as consistently for all IEnumerables public void UpdateYesterday (IEnumerable<Job> jobs) { foreach (var job : jobs) { if (job.date == Yesterday) { job.done = true; } } }

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• How can I Diff a Svn Repository using SharpSvn

  - by AngeDeLaMort

  Hello, My question is quite simple and with the SharpSvn Api, it should be easy as well. Here what I did: path = "c:\project"; using (SvnLookClient client = new SvnLookClient()) { SvnLookOrigin o = new SvnLookOrigin(path); Collection<SvnChangedEventArgs> changeList; client.GetChanged(o, out changeList); // <-- Exception } and when I call the GetChanged, I get an exception: Can't open file 'c:\project\format': The system cannot find the file specified. So, Maybe there is something I'm missing? Or maybe it's not the right way to do find out the list of files and folders that were modified in the local repository? Thanks in advance.

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• WPF ComboBox Binding to non string object

  - by Mike L

  I'm using MVVM (MVVM Light Toolkit) and have a property on the view model which exposes a list of objects. The objects contain two properties, both strings, which correlate to an abbreviation and a description. I want the ComboBox to expose the pairing as "abbreviation - description". If I use a data template, it does this easily. I have another property on the view model which represents the object that should display as selected -- the chosen item in the ComboBox. I'm binding the ItemsSource to the list, as it represents the universe of available selections, and am trying to bind the SelectedItem to this object. I'm killing myself trying to figure out why I can't get it to work, and feeling more like a fraud by the hour. In trying to learn why this works, I created the same approach with just a list of strings, and a selected string. This works perfectly. So, it clearly has something to do with the typing... perhaps something in choosing equality? Or perhaps it has to do with the data template? Here is the XAML: <Window x:Class="MvvmLight1.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="300" Width="300" DataContext="{Binding Main, Source={StaticResource Locator}}"> <Window.Resources> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="Skins/MainSkin.xaml" /> </ResourceDictionary.MergedDictionaries> <DataTemplate x:Key="DataTemplate1"> <StackPanel Orientation="Horizontal"> <TextBlock TextWrapping="Wrap" Text="{Binding CourtCode}"/> <TextBlock TextWrapping="Wrap" Text=" - "/> <TextBlock TextWrapping="Wrap" Text="{Binding CourtDescription}"/> </StackPanel> </DataTemplate> </ResourceDictionary> </Window.Resources> <Grid x:Name="LayoutRoot"> <ComboBox x:Name="cmbAbbrevDescriptions" Height="35" Margin="25,75,25,25" VerticalAlignment="Top" ItemsSource="{Binding Codes}" ItemTemplate="{DynamicResource DataTemplate1}" SelectedItem="{Binding selectedCode}" /> <ComboBox x:Name="cmbStrings" Height="35" Margin="25" VerticalAlignment="Top" ItemsSource="{Binding strs}" SelectedItem="{Binding selectedStr}"/> </Grid> </Window> And, if helpful, here is the ViewModel: using GalaSoft.MvvmLight; using MvvmLight1.Model; using System.Collections.Generic; namespace MvvmLight1.ViewModel { public class MainViewModel : ViewModelBase { public const string CodesPropertyName = "Codes"; private List<Court> _codes = null; public List<Court> Codes { get { return _codes; } set { if (_codes == value) { return; } var oldValue = _codes; _codes = value; // Update bindings and broadcast change using GalaSoft.Utility.Messenging RaisePropertyChanged(CodesPropertyName, oldValue, value, true); } } public const string selectedCodePropertyName = "selectedCode"; private Court _selectedCode = null; public Court selectedCode { get { return _selectedCode; } set { if (_selectedCode == value) { return; } var oldValue = _selectedCode; _selectedCode = value; // Update bindings and broadcast change using GalaSoft.Utility.Messenging RaisePropertyChanged(selectedCodePropertyName, oldValue, value, true); } } public const string strsPropertyName = "strs"; private List<string> _strs = null; public List<string> strs { get { return _strs; } set { if (_strs == value) { return; } var oldValue = _strs; _strs = value; // Update bindings and broadcast change using GalaSoft.Utility.Messenging RaisePropertyChanged(strsPropertyName, oldValue, value, true); } } public const string selectedStrPropertyName = "selectedStr"; private string _selectedStr = ""; public string selectedStr { get { return _selectedStr; } set { if (_selectedStr == value) { return; } var oldValue = _selectedStr; _selectedStr = value; // Update bindings and broadcast change using GalaSoft.Utility.Messenging RaisePropertyChanged(selectedStrPropertyName, oldValue, value, true); } } /// <summary> /// Initializes a new instance of the MainViewModel class. /// </summary> public MainViewModel() { Codes = new List<Court>(); Court code1 = new Court(); code1.CourtCode = "ABC"; code1.CourtDescription = "A Court"; Court code2 = new Court(); code2.CourtCode = "DEF"; code2.CourtDescription = "Second Court"; Codes.Add(code1); Codes.Add(code2); Court code3 = new Court(); code3.CourtCode = "DEF"; code3.CourtDescription = "Second Court"; selectedCode = code3; selectedStr = "Hello"; strs = new List<string>(); strs.Add("Goodbye"); strs.Add("Hello"); strs.Add("Ciao"); } } } And here is the ridiculously trivial class that is being exposed: using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace MvvmLight1.Model { public class Court { public string CourtCode { get; set; } public string CourtDescription { get; set; } } } Thanks!

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• multiple key ranges as parameters to a couchdb view

  - by kolosy

  is there a way to send multiple startKey/endKey pairs to a view, akin to the keys: [] array that can be posted for keys? the underlying problem - let's say my documents have "categories" and timestamps. if i want all documents in the "foo" category that have a timestamp that's within the last two hours, it's simple: function (doc) { emit([doc.category, doc.timestamp], null); } and then query as GET server:5894/.../myview?startKey=[foo, |now - 2 hours|]&endkey=[foo, |now|] the problem comes when i want something in categories foo or bar, within the last two hours. if i didn't care about time, i could just pull directly by key through the keys collection. unfortunately, i have no such option with ranges. what i ended up doing in the meantime is rounding the timestamp to two-hour blocks, and then multiplexing the query out: POST server:5894/.../myview keys=[[foo, 0 hours], [foo, 2 hours], [bar, 0 hours], [bar, 2 hours]] it works, but will get messy if i want to go back a large amount of time (in relationship to the blocksize)

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• Error loading a persisted workflow

  - by fra

  Hi, I have a workflow started and persisted using messaging activities. The correlation between the Start initial command and the Stop final command works well if they're sent within few seconds. Problems begin when the workflow is unloaded, because the following Stop message throws the following FaultException: If LoadWorkflowByInstanceKeyCommand.AssociateLookupKeyToInstanceId is not specified, the LookupInstanceKey must already be associated to an instance, or the LoadWorkflowByInstanceKeyCommand will fail. For this reason, it is invalid to also specify the LookupInstanceKey in the InstanceKeysToAssociate collection if AssociateLookupKeyToInstanceId isn't set Can anybody help me? The variables inside the workflow are of types int and XDocument. Any help appreciated, thank you

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• Weighted random selection using Walker's Alias Method (c# implementation)

  - by Chuck Norris

  I was looking for this algorithm (algorithm which will randomly select from a list of elements where each element has different probability of being picked (weight) ) and found only python and c implementations, after I did a C# one, a bit different (but I think simpler) I thought I should share it, and ask your opinion ? this is it: using System; using System.Collections.Generic; using System.Linq; namespace ChuckNorris { class Program { static void Main(string[] args) { var oo = new Dictionary<string, int> { {"A",7}, {"B",1}, {"C",9}, {"D",8}, {"E",11}, }; var rnd = new Random(); var pick = rnd.Next(oo.Values.Sum()); var sum = 0; var res = ""; foreach (var o in oo) { sum += o.Value; if(sum >= pick) { res = o.Key; break; } } Console.WriteLine("result is "+ res); } } } if anyone can remake it in f# please post your code

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• ItemsControl.ItemsSource MVVM performance

  - by bitbonk

  I have an (non-virtualized) ItemsControl that binds its ItemsSource to a ObeservableCollection of ViewModel instances. Now once the large amount Model instances is loaded all the ViewModel complemnents needs to be added to that ObservableCollection. How can I add a large amount of ViewModels without making the UI Thread hang? I suppose the UI Thread hangs because each time a new item is added the ItemsControl needs to update itself and does layout etc. over and over again. Should I suspend the binding add all items and then resume? If so, how? Should I override the ObservableCollection to implement an AddRange so only 1 CollectionChanged Event is fired for adding multiple items? Or alternatively just replace the whole collection? Or is it better to add each items separately and call Dispatcher.Invoke for each item separately? So I would unblock frequently. How do you handle large dynamic lists that can not be virtualized?

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• What is the equivalent of OnRender in Silverlight?

  - by John Weldon

  I'm working on porting an app from WPF to Silverlight. The app uses custom types derived from FrameworkElement (in WPF) to describe shapes, and text to be rendered on a Canvas. The WPF app root node overrides OnRender() to iterate through a collection of 'child' nodes, calling Render on each child node to build the Visual Tree. Silverlight doesn't expose OnRender, but there are hints that the same effect can be achieved using ControlTemplate. Is this the way to go, and are there any good examples of using this method available? I've done some googling (binging?) and found nothing really conclusive.

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