WCF EF return as list error

Question

User206446733 posted

Hi I got the error when return EF as the list. Here are my codes.

Public Function GetMerchantList() As List(Of Merchant) Implements IMerchant.GetMerchantList
                Dim ws As New aMerchantService.MerchantServiceClient

                Dim General As New General
                Dim kWSUrl As String = ""

                Dim endpointAddress = ws.Endpoint.Address

                Dim newEndpointAddress As New EndpointAddressBuilder(endpointAddress)
                kWSUrl = General.ConvertWsURL("App")

                newEndpointAddress.Uri = New Uri(kWSUrl & "MerchantService.svc")
         ws = New aMerchantService.MerchantServiceClient("BasicHttpBinding_IMerchantService", newEndpointAddress.ToEndpointAddress())
                Dim Data = ws.GetMerchantList()

      Return Data
End Function

Class

Public Function GetMerchantList() As List(Of Merchant)
                Dim Db As New TTMSEntities
                Dim Data = (From p In Db.TT_MERCHANT Join r In Db.TT_BRANCH_SETTING On _
                           p.MERCHANT_BRANCH_INTERNAL_NUM Equals r.INTERNAL_NUM _
                           Select New Merchant With {.MerchantID = p.MERCHANT_ID,
                                                     .MerchantName = p.DESCRIPTION,
                                                     .BranchID = r.INTERNAL_NUM,
                                                     .BranchName = r.BRANCH_DESC})

                If Data IsNot Nothing Then
                    Return Data.ToList
                Else
                    Return Nothing
                End If
 End Function

The error

The error is Error Value of type '1-dimensional array of TTMS.App.WebSites.Data.Merchant' cannot be converted to 'System.Collections.Generic.List(Of TTMS.Web.WebSites.WCF.Merchant)'.

 

Answer 1

User-417640953 posted

The error is Error Value of type '1-dimensional array of TTMS.App.WebSites.Data.Merchant' cannot be converted to 'System.Collections.Generic

    Dim Data = ws.GetMerchantList()

Hi noname,

Thanks for your post.

Based on the error message, we can see the wcf service return you the Merchant array and it cannot be converted to List<Merchant>.

Please try below code.

Dim data As New List(Of Merchant)(ws.GetMerchantList())

If has any doubt, please feel free to back. Thanks.

Best Regards!

Answer 2

User-488622176 posted

Check the service reference settings that the client :

Right click on the service reference and select Configure Service Reference.

In the Collection Type drop-down, select the type System.Collections.Generic.List.

I believe the reason it defaults to Array is that it is the most compatible when serializing. If you're consuming the service from something that recognizes something more complex, you can configure as I mentioned.