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26 Mar

The current version of ADO.Net Data Services (Astoria) for Silverlight generates some extremely Buy valium from trusted pharmacy, Plain Old CLR Objects. As Shawn Wildermuth notes, buy valium online with no prescription, Valium from international pharmacy, you dont even get INotifyPropertyChanged support. You might need this if you want to databind directly to your Astoria entities, cod online valium, Valium overseas, but if you're doing serious Silverlight work, it pays to wrap your entities up in a ViewModel, ordering valium online. Buy valium online without a prescription, Even if you're doing this, having INotifyPropertyChanged support can really help - for example, valium from canadian pharmacy, Valium in mexico, instead of saving every single entity on your model, you only need to fire the ones that change, valium discount. Free valium samples, For example:

entity.PropertyChanged += (sender, e) => dataContext.UpdateObject(sender);

Pretty soon, saturday delivery valium, Buy valium online with no prescription, this functionality will be built into Astoria. In the meantime, however, it's possible to add this functionality thanks to the partial methods in the web reference-generated entity, buy valium from trusted pharmacy. When you add an Astoria web reference to a silverlight project, where can i order valium without prescription, Valium discount, the two most interesting things that get added (expand the service reference to see these files) are:

Reference.cs


This is the C# file that contains all of the code relating to the service reference. Look inside and you will see your DataContext and all of your Entities, valium craiglist. Rx free valium, Note that your entities don't fire property changed events, but they do define partial methods:
        
public string City
{
get
{
return this._City;
}
set
{
this.OnCityChanging(value);
this._City = value;
this.OnCityChanged();
}
}
private string _City;
partial void OnCityChanging(string value);
partial void OnCityChanged();

service.edmx


This is an XML file that defines, order valium from mexican pharmacy, Order valium online overnight delivery no prescription, among other things, each of the entities in your service reference:
      <EntityType Name="Address">
<Key>
<PropertyRef Name="ID" />
</Key>
<Property Name="ID" Type="Edm.Int32" Nullable="false" />
<Property Name="Line1" Type="Edm.String" Nullable="true" />
<Property Name="Line2" Type="Edm.String" Nullable="true" />
<Property Name="City" Type="Edm.String" Nullable="true" />
<Property Name="Country" Type="Edm.String" Nullable="true" />
</EntityType>

This XML file serves as the perfect source for our data generation template, buy valium online without a prescription. Where can i buy cheapest valium online,

DataServiceINotifyPropertyChanged


If you're not familiar with T4 code generation and it's integration into visual studio, now would be a good time to go and read Oleg Sych's blog - he covers EVERYTHING, cod online valium. Buy valium from trusted pharmacy, Or you could just go ahead and incorporate my template into your Silverlight project - it works on my machine! 

In order to make the namespace of the generated file match the namespace of your service classes, you need to put this template into a top level folder that matches the name of your service reference. Valium in mexico, The template will use that directory name to find the edmx file in question:

T4 Template

 

Basically, the template loops over all the entities in the edmx, valium prices, Valium for sale, generates a partial class (which will match the service entities), then loops over all the properties and generated a partial method implementation, valium buy online. Online buy valium without a prescription, Easy.

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  1. Ruskin Dantra

    4 April 2009 at 11:28 am

    T4 templates are great although have you considered doing the same with simple AOP? Like the PostSharp framework? Considering looking at the article… http://ruskin-dantra.blogspot.com/2009/03/inotifypropertychanged-made-easier.html

     
    • Rob

      4 April 2009 at 1:46 pm

      Hi Ruskin.

      I have always wanted to play with PostSharp, and it’s great to see that it works so well for things like NotifyPropertyChanged. Unfortunately I’m working within a “low third party usage” project, so wouldn’t be able to use PostSharp in this case, although it’s clearly applicable to more than just Astoria clients.

      Does PostSharp work on silverlight projects?

       
  2. Ruskin Dantra

    6 April 2009 at 9:17 am

    I actually haven’t tried it first hand but http://blogs.msdn.com/chkoenig/archive/2008/07/23/postsharp-now-supports-silverlight-2.aspx states that it works :)

     
  3. james klett

    28 January 2013 at 11:40 pm

    I have been searching all over the web for all the answers to this problem and have found all kinds of solutions to this problem and not liked any of them becuase they are all just way to complex for such a simple thing. I makes a guy very frustrated at MS for not at least providing an option like “Generate PropertyChange Notification? yes/no”

    Anyway, this is EXACTLY what i was looking for.

    Also the funny thing is that i have been waiting for a good freason to use partial methiods but hjad not found one yet

    thanks