RIA Services ... Newbie


  • I am starting up with Silverlight, I use to be really involved with back in 2005 but then moved into a job where they were not a Microsoft shop.  I have been able to use RIA Services to connect to my database and it retrieves the data and puts it into a data grid.  That's all fine and very easy to do, but what I want to do is create the select to only pull back certain columns, yes, I have also been able to create two columns on the datagrid and bind them to the columns from the entity - again fairly simple.  But what I want is to have my SQL statements created so that I could call them from the client side with whatever event fires off (user clicks a dropdown and wants to see the data in a different view)  

    I have a table in my entity called LOGIN with columns LoginID (Identity), Username, Password, UserTypeID, PlayerID

    in my Domain Service this is my code ...

    Option Compare Binary
    Option Infer On
    Option Strict On
    Option Explicit On
    Imports System
    Imports System.Collections.Generic
    Imports System.ComponentModel
    Imports System.ComponentModel.DataAnnotations
    Imports System.Data
    Imports System.Linq
    Imports System.Web.DomainServices
    Imports System.Web.DomainServices.Providers
    Imports System.Web.Ria
    Imports System.Web.Ria.Services
    Imports TestingRIA
    Imports TestingRIA.BWEntities

    'Implements application logic using the BWEntities context.
    ' TODO: Add your application logic to these methods or in additional methods.
    ' TODO: Wire up authentication (Windows/ASP.NET Forms) and uncomment the following to disable anonymous access
    ' Also consider adding roles to restrict access as appropriate.
    '<RequiresAuthentication> _
    <EnableClientAccess()> _


    Class BWDomainService
    Inherits LinqToEntitiesDomainService(Of BWEntities)
    'TODO: Consider
    ' 1. Adding parameters to this method and constraining returned results, and/or
    ' 2. Adding query methods taking different parameters.

    Public Function GetLOGIN() As IQueryable(Of LOGIN)
     Return Me.ObjectContext.LOGIN
    End Function

    Public Sub InsertLOGIN(ByVal lOGIN As LOGIN)
    End Sub

    Public Sub UpdateLOGIN(ByVal currentLOGIN As LOGIN)
     If (currentLOGIN.EntityState = EntityState.Detached) Then
      Me.ObjectContext.AttachAsModified(currentLOGIN, Me.ChangeSet.GetOriginal(currentLOGIN))
     End If
    End Sub

    Public Sub DeleteLOGIN(ByVal lOGIN As LOGIN)
     If (lOGIN.EntityState = EntityState.Detached) Then
     End If
    End Sub

    Public Function GetUsernameByUserName() As IQueryable(Of LOGIN)
     ' This is where I would want to put in my LINQ statements?
     'var results = from l in me.objectcontext.LOGIN
     'select l.username;
    End Function



    From all of the examples on all the websites I have been to, I see that they have LINQ logic, but I don't seem to get it to compile if I use their syntax. Take for instance the VAR would not be recognized and errors out.

    I just need some pushing in the right direction with the RIA Services.  Also for updates, deletes, inserts - I am thinking about using Stored Procedures - my question on that aspect is how would I load up the parameters to call the stored procedures ( I would create the stored procedures in my new model and updated the entity)


    Friday, February 05, 2010 11:00 AM


All replies

  • Sorry for the initial unformated question ... reformated now ...

    Friday, February 05, 2010 11:20 AM
  • Hi ChaseAZ,

    You need to have .NET Framework 3.5 in order to work with var keyword and LINQ.

    As you mentioned, you're thinking about using stored procedure with ria service, here is an article that you might be interested in:

    Monday, February 08, 2010 1:56 AM
  • thanks for the reply ... this will really help me with this RIA Services. I know all about SQL Server and TSQL and this whole context syntax is very different for me. I guess the 4+ years I've been away from .NET it has dramatically changed !!!
    Monday, February 08, 2010 9:56 AM
  • Well, thank you

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