WCF REST服务流式JSON对象

Question

我需要一个windows服务，在该服务中，REST API将一组JSON对象转储到流中(内容类型：application/stream+JSON(。

示例响应(不是对象数组(：

{ id: 1, name: "name 1" }
{ id: 2, name: "name 2" }
{ id: 3, name: "name 3" }
{ id: 4, name: "name 4" }

在WCF REST中可以这样做吗？或者我应该试试别的？

Answer 1

几天后，我找到了我的案例的解决方案。首先，我修改了App.config文件，并将绑定配置添加到允许流式响应的端点。接下来，服务契约的操作必须具有返回流。然后在服务契约的实现中，我将传出响应内容类型设置为"0"；application/stream+json"；，使用DataContractJsonSerializer序列化所有对象并写入MemoryStream。最后，我将MemoryStream的位置设置为零，然后返回该流。

示例代码如下。

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>

服务合同：

[ServiceContract]
public interface IWcfService
{
[OperationContract]
[WebGet(UriTemplate = "/stream/{param}", ResponseFormat = WebMessageFormat.Json)]
Stream GetJsonStreamedObjects(string param);
}

服务合同的实施：

[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;
}
}