calling wcf service from silverlight

[cielo valdoz]

Hi,

I created a WCF web service to get data from sql database but im not sure how to call the web service from Silverlight.
I search for articles but no luck. I have to return the Top Sales Item from SQL database then generate a telerik chart. I declared an instance of WCF Service, but it doesnt go to the  mService_GetTop10SalesItemsCompleted event. Kindly check the code below.

Web Service

Imports System.ServiceModel
Imports System.ServiceModel.Activation
' NOTE: If you change the class name "IEGSDashboardService" here, you must also update the reference to "IEGSDashboardService" in Web.config.
<ServiceContract()> _
Public Interface IEGSDashboardService

    <OperationContract()> _
     Function GetTop10SalesItems(ByVal intLocation As Integer, ByVal dteDay As Date) As List(Of TopSalesItem)

End Interface

' NOTE: If you change the class name "EGSDashboardService" here, you must also update the reference to "EGSDashboardService" in Web.config and in the associated .svc file.
Public Class EGSDashboardService
    Implements IEGSDashboardService


    Public Function GetTop10SalesItems(ByVal intLocation As Integer, ByVal dteDay As Date) As System.Collections.Generic.List(Of TopSalesItem) Implements IEGSDashboardService.GetTop10SalesItems
        If intLocation = 0 Then intLocation = -1

        Dim SalesItemList As New List(Of TopSalesItem)

        Try
            Dim ctx As New DashboardDataContext
            Dim q = From c In ctx.DashboardGetTopSalesItems(intLocation, dteDay, dteDay.AddDays(30))

            For Each item In q
                SalesItemList.Add(New TopSalesItem(item.Name, item.Amount))
            Next
        Catch ex As Exception
            SalesItemList = Nothing
        End Try
        Return SalesItemList
    End Function

Class

Public Class TopSalesItem
    Private _name As String
    Private _amount As Double

    Public Property Name() As String

        Get
            Return _name
        End Get

        Set(ByVal value As String)
            _name = value
        End Set
    End Property

    Public Property Amount() As Double
        Get
            Return _amount
        End Get
        Set(ByVal value As Double)
            _amount = value
        End Set
    End Property

    Public Sub New(ByVal name As String, ByVal amount As Double)
        _name = name
        _amount = amount
    End Sub
    Public Sub New()

    End Sub
End Class

XAML

Imports Telerik.Windows.Controls.Charting
Imports System.Xml.Linq
Imports System.Windows.Interop
Imports System.Windows.Resources
Imports System.Reflection
Imports System.IO
Imports System.ComponentModel
Imports System.Linq
Imports System.Collections.ObjectModel
Imports System.Collections.Generic
Imports System.Net
Imports Telerik.Windows.Controls
Imports EGSDashboard_SL.DashboardService

Partial Public Class MainPage
    Inherits UserControl
    Public intLoc As Integer
    Public strLoc As String
    Public intDrillDown As Integer

    'Create a new instance of our WCF Service
    Public WithEvents mService As New EGSDashboardServiceClient

    Public Sub New()
        InitializeComponent()
    End Sub

    Private Sub MainPage_Loaded(ByVal sender As Object, ByVal e As System.Windows.RoutedEventArgs) Handles Me.Loaded

            Dim mService As DashboardService.EGSDashboardServiceClient = New DashboardService.EGSDashboardServiceClient()
            AddHandler mService.GetTop10SalesItemsCompleted, AddressOf mService_GetTop10SalesItemsCompleted
            mService.GetTop10SalesItemsAsync(-1, "03/23/2010")
    End Sub

Private Sub mService_GetTop10SalesItemsCompleted(ByVal sender As Object, ByVal e As DashboardService.GetTop10SalesItemsCompletedEventArgs) Handles mService.GetTop10SalesItemsCompleted
        Dim x As Object

        x = e.Result

    End Sub

Thanks,
Cielo

[Tihomir Petkov]

Hello Cielo,

Please watch the following video that explains how to consume web services in Silverlight and let me know if you still have difficulties after watching it. I will be glad to help:

http://www.silverlight.net/learn/videos/all/how-to-consume-wcf-and-aspnet-web-services-in-silverlight/

Best wishes,
Tihomir Petkov
the Telerik team

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