如何解决WCF REST 服务流式 JSON 对象
我需要一个 Windows 服务,其中 REST API 将一堆 JSON 对象转储到一个流中(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" }
可以在 WCF REST 中执行此操作吗?或者我应该尝试其他的东西?
解决方法
几天后,我找到了解决方案。首先,我修改 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,服务合约的操作必须有返回流。然后在服务契约的实现中,我将传出响应内容类型设置为“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);
}
ServiceContract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;
}
}
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