October 2011 – Knowledgebase

How to list all entity names / table names from your Entity Framework model in Silverlight 4 and RIA services

Roel van Lisdonk October 25, 2011 One Comment

If you want to list all entity names / table names from your Entity Framework model (*.edmx) in Silverlight 4, use a RIA Invoke operation: using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Data.Metadata.Edm; using System.ServiceModel.DomainServices.Server; namespace Research.Web { public partial class ResearchDomainService { /// <summary> /// Get …

Solving: Add and delete buttons on the DataForm are disabled when using an List<Entity> as ItemSoure

Roel van Lisdonk October 25, 2011 Leave a comment

When you bind the DataForm.ItemSource directly to an entity set returned from your RIA DomainService, the DataForm add and delete buttons are disabled. This is caused by the implementation in RIA Services of the entity sets. If you use an ObserverableCollection the buttons are enabled, found mine solution at: …

Solving: DisplayName not showing in a DataForm in Silverlight 4 by using data annotations on a metadata class.

Roel van Lisdonk October 24, 2011 Leave a comment

I was trying to change the displayname of a field in a dataform by placing the DisplayName attribute on the property in the metadata class. This will not work instead you must use the [Display(Name= "This is the correct display name")] attribute on the field in a metadata class: [MetadataTypeAttribute(typeof(Product.ProductMetadata))] …

Solving: "Could not activate cellular data network" on a Vodafone iPhone 4 after iOS 5 upgrade.

Roel van Lisdonk October 20, 2011 Leave a comment

After updating mine Vodafone iPhone 4 to iOS 5, all was working well, except no data connection. Error: Could not activate cellular data network. You are not subscribed to a cellular data service. I found mine solution at: http://www.iphoneclub.nl/iphone-tips/telefoonfuncties/probleem-met-mobiele-datanetwerk-oplossen/ Personal Hotspot One very nice thing about the iOS 5 …

Resolving: Validator.TryValidateObject always returns true in a UnitTest, when using a MetadataType class in Entity Framework 4

Roel van Lisdonk October 19, 2011 2 Comments

When you use a metadata class in Entity Framework the registration between the entity and the metadata class is not registered for all Microsoft Visual Studio Project types (the "test project class library" for example). I found the solution at: http://stackoverflow.com/questions/2657358/net-4-rtm-metadatatype-attribute-ignored-when-using-validator. It demonstrates registring all metadata classes in an assembly. …

Generating metadata files for your Entity Framework model with a t4 template.

Roel van Lisdonk October 18, 2011 Leave a comment

If you want to generate metadata classes automatically bases on your Entity Framework model, you can use the http://t4metadatatemplate.codeplex.com

Solving: No microphone sound in Skype, when using remote desktop in Windows 7: No audio devices are installed.

Roel van Lisdonk October 13, 2011 12 Comments

I was using Microsoft Remote Desktop on a Microsoft Windows 7 machine to remotely control an other Windows 7 machine an I was running Skype on the remote machine. There was coming sound through the boxes of the local machine, but the microphone was not recorded even when the settings …

Solving: Running a unittest in the current context [CTRL + R, T] will not rebuild the Microsoft Visual Studio Test project.

Roel van Lisdonk October 11, 2011 Leave a comment

Normally when you alter code in your Microsoft Visual Studio test project, pressing [CTRL + R, T] will rebuild the project and will execute the correct code. In my case altering the code in the unit test did not result in recompiling the test project. Turns out the test …

Solving: The attachable property ‘Behaviors’ was not found in type ‘Interaction’

Roel van Lisdonk October 11, 2011 Leave a comment

I was getting the error: The attachable property ‘Behaviors’ was not found in type ‘Interaction’. This was generated by a missing reference to the "System.Windows.Interactivity" assembly. You can download the assembly at http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=3062 It is contained in the BlendSLSDK_en.msi You can extract the msi package without installing it, …

Solving: Invoke operation ‘MyOperation’ failed. Unable to load the specified metadata resource.

Roel van Lisdonk October 7, 2011 Leave a comment

If you encounter the error: “Invoke operation ‘MyOperation’ failed. Unable to load the specified metadata resource”. Please check the connection string used by Entity Framework. In my case, I changed the namespace for the *.edmx file, but forgot to change the namespace in the connection string in the Web.config: …