WCF REST service streaming JSON objects - json

Question

I need a windows service in which the REST API dumps a bunch of JSON objects into a stream (content-type: application/stream+json).
Example response (not array of objects):
{ id: 1, name: "name 1" }
{ id: 2, name: "name 2" }
{ id: 3, name: "name 3" }
{ id: 4, name: "name 4" }
It is possible doing this in WCF REST? Or maybe I should try something other?

Answer 1

After a few days I found a solution of my case. First I was modify App.config file and add binding configuration to the endpoint that allow streamed response. Next, operation of service contract must have return Stream. Then in implementation of service contract I set outgoing response content type to "application/stream+json", serialize all objects using DataContractJsonSerializer and write to MemoryStream. At the end I was set position of MemoryStream to zero and then return that stream.
Sample code bellow.
App.config:
<system.serviceModel>
<serviceHostingEnvironment aspNetCompatibilityEnabled="true" />
<services>
<service name="WinService.WcfService">
<endpoint address="" binding="webHttpBinding" bindingConfiguration="webHttpBindingStreamedResponse" contract="WinService.IWcfService" behaviorConfiguration="webHttp" />
<endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
</service>
</services>
<bindings>
<webHttpBinding>
<binding name="webHttpBindingStreamedResponse" transferMode="StreamedResponse" maxReceivedMessageSize="67108864"/>
</webHttpBinding>
</bindings>
<behaviors>
<serviceBehaviors>
<behavior>
<!-- To avoid disclosing metadata information,
set the values below to false before deployment -->
<serviceMetadata httpGetEnabled="True" httpsGetEnabled="True" />
<!-- 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="True" />
</behavior>
</serviceBehaviors>
<endpointBehaviors>
<behavior name="webHttp">
<webHttp />
</behavior>
</endpointBehaviors>
</behaviors>
</system.serviceModel>
ServiceContract:
[ServiceContract]
public interface IWcfService
{
[OperationContract]
[WebGet(UriTemplate = "/stream/{param}", ResponseFormat = WebMessageFormat.Json)]
Stream GetJsonStreamedObjects(string param);
}
Implementation of ServiceContract:
[ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall)]
[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
public class WcfService : IWcfService
{
public Stream GetJsonStreamedObjects(string param)
{
var stream = new MemoryStream();
var serializer = new DataContractJsonSerializer(typeof(JsonObjectDataContract));
WebOperationContext.Current.OutgoingResponse.ContentType = "application/stream+json";
foreach (JsonObjectDataContract jsonObjectDataContract in Repository.GetJsonObjectDataContracts(param))
{
serializer.WriteObject(stream, jsonObjectDataContract);
}
stream.Position = 0;
return stream;
}
}