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• Ria Services loading foreign keys with Linq-to-SQL

  - by Stephan

  I have a database that consists of 5 tables : Course, Category, Location, CourseCategories, and CourseLocations. The last 2 tables just contain the two foreign keys. A Course has many-to-many relationships with both category and location. I am trying to load the data into a Silverlight app using Ria Services. My DB model is Linq-to-SQL. I have tried adding the [Include] attribute to the metadata classes and I have added the DataLoadOptions so it should load the all tables when you ask for a Course. However on the client side I am never getting back any entries in the CourseCategories and CourseLocations properties. What else needs to be done to get the foreign key relationships to exist across the serialization.

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• How to extend abstract Entity class in RIA Services

  - by Calanus

  I want to add a bool variable and property to the base Entity class in my RIA services project so that it is available throughout all the entity objects but seem unable to work out how to do this. I know that adding properties to actual entities themselves is easy using .shared.cs and partial classes but adding such properties to the Entity class using similar methods doesn't work. For example, the following code doesn't work namespace System.ServiceModel.DomainServices.Client { public abstract partial class Entity { private bool auditRequired; public bool AuditRequired { get { return auditRequired; } set { auditRequired = value; } } } } All that happens is that the existing Entity class gets totally overriden rather than extending the Entity class. How do I extend the base Entity class so that functionality is available thoughout all derived entity classes?

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• Silverlight Bind to TextBlock from RIA Services

  - by DaRKoN_

  I've a TextBlock that looks like so: <TextBlock Text="{Binding Name}" /> This is inside a <Canvas> with the DataContext set to MyClient which is in the ViewModel: public Client MyClient { get; private set; } // This is a RIA Entity, hence supports INotifyPropertyChanged public ViewModel() { MyClient = new Client(); LoadOperation<Client> loadClient = RiaContext.Load<Client>(RiaContext.GetClientsQuery()); loadClient.Completed += new EventHandler(loadClient_Completed); } void loadClient_Completed(object sender, EventArgs e) { MyClient = DB.Clients.Single(); } Setting MyClient like the above does not raise the PropertyChanged event. As such the UI is never updated.

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• Exposing entities via a nHibernate implementation RIA Services with querystring queries

  - by illdev

  I once read a blog post and cannot find it anymore. drat! It was about a guy who setup a wcf service (I guess RIA, but could have been something else) exposing the model via IQueryable to the querystring. Sou you could say http://host/articles/123/ratings and you'd get a list (soap or json) of serialized Rating entities (the properties which had some attribute attached) which pertained to an article with id 123. All this with nHibernate / nh linq in the back and in surprisingly few lines of code. Anyone knows what I am talking about? Experiences, suggestions?

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• Two DomainContext or data sources with WCF RIA - Silverlight page

  - by Mayur Kotlikar

  I am writting a Silverlight Business Application with WCF RIA link. I have 2 databases on same SQL server, Public and Private. The Public database contains a table which is mostly for public access level, like "user" table which has basic user information The Private database contains a table which has "private" information, user bank transactions etc I created 2 ADO.Net entity models, one each for Private and Public database and selected the tables. I also created 2 different domain context services On on Silverlight page, I need to get information from the tables that are across 2 databases, Private and Public as described above. How do I achieve this? I am thinking of some kind of a wrapper that internally gets data from domain services. Whats the best approach?

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• Customize a WCF RIA Services Endpoint

  - by Andrew Garrison

  Is it possible to customize the parameters of a WCF RIA Services endpoint? Specifically, I would like to create a custom binding for the endpoint and increase the maxReceivedMessageSize to allow sending the contents of a file that is a few megabytes in size. I've tried meddling in the web.config, but I'm getting the following error: [InvalidOperationException]: The contract name MyNamespace.MyService could not be found in the list of contracts implemented by the service MyNamespace.MyService web.config <system.serviceModel> <bindings> <customBinding> <binding name="CustomBinaryHttpBinding"> <binaryMessageEncoding /> <httpTransport maxReceivedMessageSize="2147483647" maxBufferSize="2147483647" /> </binding> </customBinding> </bindings> <services> <service name="MyNamespace.MyService"> <endpoint address="" binding="wsHttpBinding" contract="MyNamespace.MyService" /> <endpoint address="/binary" binding="customBinding" bindingConfiguration="CustomBinaryHttpBinding" contract="MyNamespace.MyService" /> </service> </services> <serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="true" /> </system.serviceModel>

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• Customize a WCF RIA Services EndpointRSS Feed

  - by Andrew Garrison

  Is it possible to customize the parameters of a WCF RIA Services endpoint? Specifically, I would like to create a custom binding for the endpoint and increase the maxReceivedMessageSize to allow sending the contents of a file that is a few megabytes in size. I've tried meddling in the web.config, but I'm getting the following error: [InvalidOperationException]: The contract name MyNamespace.MyService could not be found in the list of contracts implemented by the service MyNamespace.MyService web.config <system.serviceModel> <bindings> <customBinding> <binding name="CustomBinaryHttpBinding"> <binaryMessageEncoding /> <httpTransport maxReceivedMessageSize="2147483647" maxBufferSize="2147483647" /> </binding> </customBinding> </bindings> <services> <service name="MyNamespace.MyService"> <endpoint address="" binding="wsHttpBinding" contract="MyNamespace.MyService" /> <endpoint address="/binary" binding="customBinding" bindingConfiguration="CustomBinaryHttpBinding" contract="MyNamespace.MyService" /> </service> </services> <serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="true" /> </system.serviceModel>

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• How to Store State in Silverlight WCF RIA Services

  - by peter

  Hi All, I am developing a silverlight 3 application using WCF RIA services. I am using the AuthenticationBase class to handle my authentication. As I understand it under the hood this uses the ASP .NET authentication libraries. When I log into the site the authentication service handles login state so that if I close the site and open it straight away I am still logged in according to the server. When the webpage is refreshed or closed and reloaded I can call the method, WebContextBase.Current.Authentication.LoadUser() And it goes back to the authentication service (running on the server) and figures out whether I am still logged into the site. If a timeout has occured the answer will be no. If that is the case I can show a login dialog. The problem I want to solve is that the authentication service consumes the password, and there is no way I can ever retrieve that password again. If the user logs into the site I want to store the password on the server, and return a token to the client side to match up with that password. I have some other services on the server side that need that password. So where should I store that password on the server? How can that be done? How does the WCF authentication store state?

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• WCF RIA Services Custom Type with Collection of Custom Types

  - by Blakewell

  Is it possible to have a custom type within a custom type and have the result returned via WCF RIA services? I have the following two classes below, but I can't gain access to the Verticies property within the Polygon class. I assume it is because it is a custom class, or something to do with it being a List collection. Polygon Class public class Polygon { public Polygon() { _vertices = new List<Location>(); } private int _id; [Key] public int Id { get; set; } private List<Location> _vertices; public List<Location> Vertices { get { return _vertices; } set { _vertices = value; } } } Location Class public class Location { public Location() { } /// <summary> /// Default constructor for creating a Location object /// </summary> /// <param name="latitude"></param> /// <param name="longitude"></param> public Location( double latitude, double longitude ) { _latitude = latitude; _longitude = longitude; } private int _id; [Key] public int Id { get { return _id; } set { _id = value; } } private double _latitude; /// <summary> /// Latitude coordinate of the location /// </summary> public double Latitude { get { return _latitude; } set { _latitude = value; } } private double _longitude; /// <summary> /// Longitude coordiante of the location /// </summary> public double Longitude { get { return _longitude; } set { _longitude = value; } } }

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• Multi threading in WCF RIA Services

  - by synergetic

  I use WCF RIA Services to update customer database. In domain service: public void UpdateCustomer(Customer customer) { this.ObjectContext.Customers.AttachAsModified(customer); syncCustomer(customer); } After update, a database trigger launches and depending on the columns updated it may insert a new record in CustomerChange table. syncCustomer(customer) method is executed to check for a new record in the CustomerChange table and if found it will create a text file which contains customer information and forwards that file to external system for import. Now this synchronization may take a time so I wanted to execute it in different thread. So: private void syncCustomer(Customer customer) { this.ObjectContext.SaveChanges(); new Thread(() => syncCustomerInfo(customer.CustomerID)) { IsBackground = true }.Start(); } private void syncCustomerInfo(int customerID) { //Thread.Sleep(2000); //does real job here ... ... } The problem is in most cases syncCustomerInfo method cannot find any new CustomerChange record even if it was definitely there. If I force thread sleep then it finds a new record. I also looked Entity Framework events but the only event provided by object context is SavingChanges which occur before changes are saved. Please suggest me what else to try.

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• How to prepare data for display on a silverlight chart using WCF RIA Services + Entity Framework

  - by Banford

  I've used WCF RIA services with Entity Framework to build a simple application which can display and updates data about school courses. This was done by following the Microsoft tutorials. Now I would like to have a chart which shows a count for how many courses are on a key stage. Example: Key Stage 3 - 20 courses Key Stage 4 - 32 courses Key Stage 5 - 12 courses Displayed on any form of chart. I have no problem binding data to the chart in XAML. My problem is that I do not know how to correct way of getting the data into that format. The generated CRUD methods are basic. I have a few thoughts about possible ways, but don't know which is correct, they are: Create a View in SQL server and map this to a separate Entity in the Entity Data Model. Generating new CRUD methods for this automatically. Customise the read method in the existing DomainService using .Select() .Distinct() etc. Don't know this syntax very well labda expressions/LINQ??? what is it? Any good quickstarts on it? Create a new class to store only the data required and create a read method for it. Tried this but didn't know how to make it work without a matching entity in the entity model. Something I am not aware of. I'm very new to this and struggling with the concepts so if there are useful blogs or documentation I've missed feel free to point me towards them. But I'm unsure of the terminology to use in my searches at the moment.

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• RIA Service - without database?

  - by Heko

  Helo! I need to write a RIA service to call Java webservices from Silverlight 3.0 app. I'm testing how stuff works and in my Web app I have a MyData class which has 2 properties (int ID, string Text): namespace SilverlightApplication1.Web { public class MyData { [Key] public int ID { get; set; } public string Text { get; set; } } } Then I wrote simple DomainService: [EnableClientAccess()] public class MyService : DomainService { public IQueryable<MyData> GetMyData(string Url) { // here I will call my WebService List<MyData> result = new List<MyData>(); result.Add(new MyData { ID = 1, Text = Url }); return result.AsQueryable(); } } } How can I get data into my SL app? Now I have this: namespace SilverlightApplication1 { public partial class MainPage : UserControl { public MainPage() { InitializeComponent(); MyContext context = new MyContext(); } } } I called and load but nothink worsk (exceptions, or nulls)... I had Invoke annotation but MyData is not TEntity and I can't use Strings or other simple types as well... :/ I'm reading and reading posts and nothing works like it should.. Any help would be really appreciated. Thank you!

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• RIA Services Repository Save does not work!?

  - by Savvas Sopiadis

  Hello everybody! Doing my first SL4 MVVM RIA based application and i ran into the following situation: updating a record (EF4,NO-POCOS!!) in the SL-client seems to take place, but values in the dbms are unchanged. Debugging with Fiddler the message on save is (amongst others): EntityActions.nil? b9http://schemas.microsoft.com/2003/10/Serialization/Arrays^HasMemberChanges?^Id?^ Operation?Update I assume that this says only: hey! the dbms should do an update on this record, AND nothing more! Is that right?! I 'm using a generic repository like this: public class Repository<T> : IRepository<T> where T : class { IObjectSet<T> _objectSet; IObjectContext _objectContext; public Repository(IObjectContext objectContext) { this._objectContext = objectContext; _objectSet = objectContext.CreateObjectSet<T>(); } public IQueryable<T> AsQueryable() { return _objectSet; } public IEnumerable<T> GetAll() { return _objectSet.ToList(); } public IEnumerable<T> Find(Expression<Func<T, bool>> where) { return _objectSet.Where(where); } public T Single(Expression<Func<T, bool>> where) { return _objectSet.Single(where); } public T First(Expression<Func<T, bool>> where) { return _objectSet.First(where); } public void Delete(T entity) { _objectSet.DeleteObject(entity); } public void Add(T entity) { _objectSet.AddObject(entity); } public void Attach(T entity) { _objectSet.Attach(entity); } public void Save() { _objectContext.SaveChanges(); } } The DomainService Update Method is the following: [Update] public void UpdateCulture(Culture currentCulture) { if (currentCulture.EntityState == System.Data.EntityState.Detached) { this.cultureRepository.Attach(currentCulture); } this.cultureRepository.Save(); } I know that the currentCulture-Entity is detached. What confuses me (amongst other things) is this: is the _objectContext still alive? (which means it "will be"??? aware of the changes made to record, so simply calling Attach() and then Save() should be enough!?!?) What am i missing? Development Environment: VS2010RC - Entity Framework 4 (no POCOs) Thanks in advance

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• Sessions I Submitted to the PASS Summit 2010

  - by andyleonard

  Introduction I'm borrowing an idea and blog post title from Brent Ozar ( Blog - @BrentO ). I am honored the PASS Summit 2010 (Seattle, 8 - 11 Nov 2010) would consider allowing me to present. It's a truly awesome event. If you have an opportunity to attend and read this blog, please find me and introduce yourself. If you've built a cool solution to a business or technical problem; or written a script - or a bunch of scripts - to automate part of your daily / weekly / monthly routine; or have some...(read more)

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• Possible for one developer to work on a site thats on another developer's server?

  - by cire4

  Sorry for the confusing title. Let me explain: I am currently trying to get a site developed. My current developer has taken the site about as far as I think they are capable of and I am planning on hiring another developer to put the finishing touches on it, debug it and upgrade some of the more technical details. The site is hosted on my current developer's server. They are scheduled to work on it until mid-April, at which point they will transfer the site to my server. I would like the new developer to get started on the upgrades to the site as soon as possible. So my question is this: Is it possible for the new developer to start working on upgrades to the site while it is still on the old developer's server (and without the old developer knowing about it)? Would the new developer have to create a mirror site and work on it that way? I'm having trouble imagining if this is possible so any advice you can offer would be much appreciated!

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• From Oracle PL/SQL Developer to Java programmer - Is it a good decision? [on hold]

  - by user3554231

  I will explain my question in simple words. I have little over 1 year experience in Oracle. My dream is to be "called" as a 'Developer', be it database developer if not software developer. But right now I don't develop anything neither I am in good touch with PL/SQL and other Oracle Utilites like SQL*LOADER, shell scripting and stuff like that as I am only a System Analyst where I analyze and configure database using SQL queries. To be honest, I know very basic PL/SQL and good knowledge in SQL but that won't ever give me a chance to be a developer as I am lagging way behind the "real" developers knowledge. Now I feel I should learn JAVA as well so that I can cope up with the competition. But I am too scared to learn new things as it will take much more time which will indirectly increase my useless work experince(just analyzing) which values nothing in todays market. Moreover that, I am too lazy to work hard i.e. to study and not to work during office hours. To sum it up I am lazy and confused and scared but I want to learn things as well but don't know if I am intelligent enough to learn whole of PL/SQL or to master any other language. Is there any other way from which I can feel confident? Actually I even feel sometimes that after 2-3 years if I still don't achieve my goal, I won't ever be able to reach my destination. I just want to live my dream of being a developer. Give me some tips and hopes but not false hopes.

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• Silverlight TV 20: Community Driven Development with WCF RIA Services

  In this episode, John talks with Jeff Handley about how the community's feedback really helped shape some features in WCF RIA Services. Jeff is very active in the community and has a wealth of knowledge about WCF RIA Services. Relevant links: John's Blog and John on Twitter Jeff's Blog and Jeff on Twitter WCF RIA Services ContosoSales sample application shown in the episode Silverlight 4 RC Features (or download here) Follow us on Twitter @SilverlightTV Silverlight Training...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• WCF RIA Services : une approche pragmatique, par Benjamin Devuyst

  Bonjour, J'ai terminé un tutoriel abordant l'utilisation de Wcf Ria Services à travers Silverlight. Ce tutoriel a pour but de décrire les étapes à suivre pour mettre en place RIA, mais en tenant compte de l'expérience acquise au cours de ces derniers mois (réalisation de projets qui utilisent RIA). Il aborde donc la technologie et expose les solutions mises en place pour faciliter les phases de développement (gestion des erreurs, conflits, classe partielle pour définir le "DomainService", etc.). Il s'agit, en quelque sorte, d'ébauches de "bonnes conduites" (en toute modestie) qui ont facilité le développement des logiciels. Le tutoriel est disponible ici :

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• RIA Services and Validation

  Earlier today, my SilverlightTV recording on RIA Services and Validation went online. I used validation as a feature area to focus on this first recording on RIA Services, because I think it illustrates both the RIA Services value proposition and key elements of the vision around the project in a very direct manner. Specifically: Focus on end-to-end solutions for data scenarios. It is not sufficient to just address querying data or submitting some changes, but about providing the infrastructure...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Silverlight 4 and RIA Services Release Candidate Available NOW

  At Mix10 this morning in Vegas ScottGu announced that Silverlight 4 and RIA Services RC are available for download now!  These bits work great with VS2010 RC.  We have some great videos, and updated samples already posted on http://silverlight.net/riaservices Deepesh has a great list of what is new in this drop  RIA Services RC and Toolkit March 2010 now available and there is the official forum post from DineshKu RIA Services Road to RTW via RC at MIX. INDEI Support:-...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Exposing SOAP, OData, and JSON Endpoints for RIA Services (Silverlight TV 26)

  In this video, John meets with Deepesh Mohnani from the WCF RIA Services team. Deepesh demonstrates how to expose various endpoints from WCF RIA Services. This is a great explanation and walk through of how to open RIA Services domain services to clients, including: Silverlight clients (of course) Creating an OData endpoint and showing how Excel can use it Creating a SOAP endpoint to a domain service and using it from a Windows Phone 7 application Creating a JSON endpoint and having...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• How to eager load in WCF Ria Services/Linq2SQLDomainModel

  - by Aggelos Mpimpoudis

  I have a databound grid at my view (XAML) and the Itemsource points to a ReportsCollection. The Reports entity has three primitives and some complex types. These three are shown as expected at datagrid. Additionally the Reports entity has a property of type Store. When loading Reports via GetReports domain method, I quickly figure out that only primitives are returned and not the whole graph of some depth. So, as I wanted to load the Store property too, I made this alteration at my domain service: public IQueryable<Report> GetReports() { return this.ObjectContext.Reports.Include("Store"); } From what I see at the immediate window, store is loaded as expected, but when returned to client is still pruned. How can this be fixed? Thank you!

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• RIA Services Filter descriptor

  - by Mohit

  I have a Filterdescriptor as shown below. The propertypath is of type 'char?' I get following InvalidOperationException when I filter by entering a value Y InnerException {System.InvalidOperationException: A FilterDescriptor with its PropertyPath equal to 'Valid' cannot be evaluated. --- System.ArgumentException: Operator 'StartsWith' incompatible with operand types 'Char?' and 'Char?' --- System.ArgumentNullException: Value cannot be null. Parameter name: method at System.Linq.Expressions.Expression.ValidateCallArgs(Expression instance, MethodInfo method, ReadOnlyCollection1& arguments) at System.Linq.Expressions.Expression.Call(Expression instance, MethodInfo method, IEnumerable1 arguments) at System.Linq.Expressions.Expression.Call(Expression instance, MethodInfo method, Expression[] arguments) at System.Windows.Controls.LinqHelper.GenerateMethodCall(String methodName, Expression left, Expression right) at System.Windows.Controls.LinqHelper.GenerateStartsWith(Expression left, Expression right) at System.Windows.Controls.LinqHelper.BuildFilterExpression(Expression propertyExpression, FilterOperator filterOperator, Expression valueExpression, Boolean isCaseSensitive, Expression& filterExpression) --- End of inner exception stack trace --- --- End of inner exception stack trace ---} System.Exception {System.InvalidOperationException}

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• Using RIA Services FilterDescriptor from code behind

  - by Fermin

  Hi, I was wondering if it's possible to use the FilterDescriptor control from code behind? On the page load of my form I set the datasource of a grid in the code behind, not using a DomainDataSource control, like: TestDomainContext context = new TestDomainContext(); dataGridEmployees.ItemsSource = context.EmployeePositions; context.Load(context.GetEmployeesWithPositionQuery()); I have a textbox on my page that the user can enter into to filter on employee position. Is it now possible to add FilterDescriptor to the source of the DataGrid in code behind? Or would I manually need to filter the results of the context.GetEmployeesWithPositionQuery, for example on KeyUp event of the filter TextBox?

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• silverlight master-detail with two listboxes in pure xaml with ria services throwing exception

  - by Sam

  Hi, I was trying to achieve master-detail with 2 ListBox, 2 DomainDataSource and a IValueConverter, when entering the page it throws the random error it does when your xaml is invalid: "AG_E_PARSER_BAD_PROPERTY_VALUE [Line: 24 Position: 61]" Which is in fact the start position of where I am binding the listbox selected item with converter to the parameter's value of my DomainDataSource. I would love to achieve this by pure xaml, I did it by code behind and that works but I don't like it :p When the parameter is a hard-coded integer 1, it works, so I assume it's the value binding My code is below here, thanks in advance for at least looking :) (taken into accound all the xmlns's & usings are correct) Xaml: <Grid x:Name="LayoutRoot"> <Grid.Resources> <helpers:ListItemtoIdListValueConverter x:Key="mListConverter" /> </Grid.Resources> <riacontrols:DomainDataSource x:Name="GetLists" DomainContext="{StaticResource DbContext}" LoadSize="20" QueryName="GetLists" AutoLoad="True" /> <riacontrols:DomainDataSource x:Name="GetListItems" DomainContext="{StaticResource DbContext}" LoadSize="20" QueryName="GetListItemsById" AutoLoad="True"> <riacontrols:DomainDataSource.QueryParameters> <riadata:Parameter ParameterName="id" Value="{Binding ElementName=ListBoxLists, Path=SelectedItem, Converter={StaticResource mListConverter}}" /> </riacontrols:DomainDataSource.QueryParameters> </riacontrols:DomainDataSource> <activity:Activity IsActive="{Binding IsBusy, ElementName=ListBoxListItems}"> <StackPanel Orientation="Horizontal"> <ListBox x:Name="ListBoxLists" ItemsSource="{Binding Data, ElementName=GetLists, Mode=OneWay}" Width="150" Margin="0,0,10,10" /> <ListBox x:Name="ListBoxListItems" ItemsSource="{Binding Data, ElementName=GetListItems, Mode=OneWay}" Width="150" Margin="0,0,10,10" /> </StackPanel> </activity:Activity> </Grid> IValueConverter: public class ListItemtoIdListValueConverter: IValueConverter { #region IValueConverter Members public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { list mList = (list)value; if (mList != null) return mList.id; else return null; } public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { throw new NotImplementedException(); } #endregion }

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