I have a question:
When I create my custom domain service (to consume 3rd party web service) where I use parametrized CRUD methods everything works, except creating a new record.
Lightswitch adds this domain service as a datasource and is able to create a screen for adding new record. When I click the “Save” button in generated application, it correctly calls the Create method on domain service, the record is correctly created by remote web service and the program is leaving the Create method on a domain service. but suddenly the lightswitch calls the default query method, which is non parametrized and returning a Enumerable in my case.
It seems like lightswitch is trying to re-read the yet created record to display it. But it does not use a proper ReadOne method, which is correctly prepared, created and even recognized by lightswitch, because it is able to call it on an other detail screen.

Why does Lightswitch call this [Query(IsDefault=true)] method please?

thank you for any hints

h

Hopefuly this snippet will help the next VB.Net user that comes along.

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.Linq
Imports System.ServiceModel.DomainServices.Hosting
Imports System.ServiceModel.DomainServices.Server
Imports System.Xml
Imports USZipCodeRIAService.Web.uszipcodewebref

Namespace USZipcodeRIAService.Web

‘This node class to represent the webservice’s output model
Public NotInheritable Class WebServiceNode
‘LS requires at least one Key field. So make Zip column as Key

Public Property Zip() As String
Public Property City() As String
Public Property State() As String
Public Property Area() As String
Public Property TimeZone() As String

‘return a new class
Public Shared Function CreateNew(ByVal node As XmlNode) As WebServiceNode
Return New WebServiceNode With {.City = node.ChildNodes(0).InnerText, .State = node.ChildNodes(1).InnerText, .Zip = node.ChildNodes(2).InnerText, .Area = node.ChildNodes(3).InnerText, .TimeZone = node.ChildNodes(4).InnerText}
End Function
End Class

‘Data Helper
Public NotInheritable Class Converter
Public Shared Iterator Function SelectAllCities(ByVal xDoc As XmlNode) As IEnumerable(Of WebServiceNode)
‘This enables the XmlNode Type to enumerate
Dim cities As IEnumerator = xDoc.GetEnumerator()
Do While cities.MoveNext()
Yield WebServiceNode.CreateNew(CType(cities.Current, XmlNode))
Loop
End Function
End Class

Public Class ZipcodeDomainService
Inherits DomainService
‘LS requires a default parameterless query function
‘or a skeleton class to return

Public Function FakeFunction() As IEnumerable(Of WebServiceNode)
Return SelectCity(“”)
End Function

‘This is the function we need to call from LS

Public Function SelectCity(ByVal cityname As String) As IEnumerable(Of WebServiceNode)
‘Instantiate USZip class from WebService Provider and pass city name
Return Converter.SelectAllCities(New USZip().GetInfoByCity(cityname))
End Function
End Class
End Namespace

after IEnumerable.