WCF rest service for list - json not working - json

Question

My wcf reset service has only 2 contracts, one is working always and the other did not work.
Service Code:
Public Class BasicServ
Implements IBasicServ
Public Function DoWork() Implements IBasicServ.DoWork
Return "Working"
End Function
Function Authorize(ByVal id As String, ByVal pw As String) Implements IBasicServ.Authorize
Dim c As New List(Of Guid)
For i = 0 To 10
c.Add(Guid.NewGuid)
Next
Return c
'Return Guid.NewGuid
End Function
End Class
Contract File code:
<ServiceContract()>
Public Interface IBasicServ
<OperationContract()>
<WebGet(UriTemplate:="test/", BodyStyle:=WebMessageBodyStyle.Wrapped, RequestFormat:=WebMessageFormat.Json, ResponseFormat:=WebMessageFormat.Json)>
Function DoWork()
<OperationContract()>
<WebGet(UriTemplate:="Authorize/{id}/{pw}", BodyStyle:=WebMessageBodyStyle.Wrapped, RequestFormat:=WebMessageFormat.Json, ResponseFormat:=WebMessageFormat.Json)>
Function Authorize(ByVal id As String, ByVal pw As String)
End Interface
Web Config File:
<?xml version="1.0"?>
<configuration>
<system.diagnostics>
<sources>
<source name="System.ServiceModel.MessageLogging">
<listeners>
<add name="messagelistener"
type="System.Diagnostics.XmlWriterTraceListener"
initializeData="d:\logs\myMessages.svclog"></add>
</listeners>
</source>
</sources>
<trace autoflush="true"/>
</system.diagnostics>
<system.web>
<compilation debug="true" strict="false" explicit="true" targetFramework="4.0" />
</system.web>
<system.serviceModel>
<diagnostics>
<messageLogging logEntireMessage="true"
logMessagesAtServiceLevel="false"
logMessagesAtTransportLevel="false"
logMalformedMessages="true"
maxMessagesToLog="5000"
maxSizeOfMessageToLog="2000">
</messageLogging>
</diagnostics>
<services>
<service behaviorConfiguration="ServBehav" name="AssistantWcf.BasicServ">
<endpoint address="auth" behaviorConfiguration="EndBehav" binding="webHttpBinding" name="endpointname" contract="AssistantWcf.IBasicServ" />
</service>
</services>
<behaviors>
<endpointBehaviors>
<behavior name="EndBehav">
<webHttp/>
</behavior>
</endpointBehaviors>
<serviceBehaviors>
<behavior name="ServBehav">
<!-- To avoid disclosing metadata information, set the value below to false before deployment -->
<serviceMetadata httpGetEnabled="true" httpGetBinding="webHttpBinding" httpGetBindingConfiguration="" />
<!-- To receive exception details in faults for debugging purposes, set the value below to true. Set to false before deployment to avoid disclosing exception information -->
<serviceDebug includeExceptionDetailInFaults="false"/>
</behavior>
</serviceBehaviors>
</behaviors>
<serviceHostingEnvironment multipleSiteBindingsEnabled="true" />
</system.serviceModel>
<system.webServer>
<modules runAllManagedModulesForAllRequests="true"/>
<!--
To browse web app root directory during debugging, set the value below to true.
Set to false before deployment to avoid disclosing web app folder information.
-->
<directoryBrowse enabled="true"/>
</system.webServer>
</configuration>
While debugging/testing, I found that, if I return only 1 GUID in Authoriza method, it is working, but when I am sending a list of GUID, it is not working, and the SVClog file is not getting created. Could you please help me understand WCF REST service better. Thank you.

Answer 1

From above comments and few experiments, the solution for the question is that a return type is not compulsory if it is string, but if anything else, return type must be specified. Better if return type is provided always.