WCF服务:transferMode: StreamingResponse不工作

Question

我正在尝试创建一个流WCF服务。我已经创建了一个我认为应该支持流响应的服务(作为VS中的WCF服务应用程序项目)和一个客户端，它只是一个控制台应用程序项目，我在其中添加了服务作为服务参考。当我将客户端的传输模式设置为Buffered时，代码可以工作，但如果我将其更改为StreamedResponse，我会得到一个只有大约1500字节数据的流，而不是当我使用缓冲传输模式时获得的33k。

下面是我的代码的关键部分:

界面

namespace Microsoft.Samples.Stream
{
    [ServiceContract(Namespace = "http://Microsoft.Samples.Stream")]
    public interface IStreamingSample
    {
        [OperationContract]
        System.IO.Stream GetStream(string data);
    }
}

实现接口

的类

namespace Microsoft.Samples.Stream
{
    public class StreamingService : IStreamingSample
    {
        public System.IO.Stream GetStream(string data)
        {
            try
            {
                FileStream imageFile = File.OpenRead("e:/image.jpg");
                return imageFile;
            }
            catch (IOException ex)
            {
                throw ex;
            }
        }
    }
}

网络。配置服务:

<?xml version="1.0"?>
<configuration>
  <system.web>
    <compilation debug="true" targetFramework="4.0" />
  </system.web>
  <system.serviceModel>
    <services>
      <service name="Microsoft.Samples.Stream.StreamingService">
        <endpoint address="ep1" binding="basicHttpBinding" contract="Microsoft.Samples.Stream.IStreamingSample"/>
        <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>
      </service>
    </services>
    <bindings>
      <basicHttpBinding>
        <binding maxReceivedMessageSize="67108864" transferMode="StreamedResponse" />
      </basicHttpBinding>
    </bindings>
    <behaviors>
      <serviceBehaviors>
        <behavior>
          <serviceMetadata httpGetEnabled="True"/>
          <serviceDebug includeExceptionDetailInFaults="False"/>
        </behavior>
      </serviceBehaviors>
    </behaviors>
  </system.serviceModel>
  <system.webServer>
    <modules runAllManagedModulesForAllRequests="true"/>
  </system.webServer>
</configuration>

应用程序。客户端配置:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <system.serviceModel>
        <bindings>
            <basicHttpBinding>
                <binding name="BasicHttpBinding_IStreamingSample" closeTimeout="00:01:00"
                    openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00"
                    allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard"
                    maxBufferSize="65536" maxBufferPoolSize="524288" maxReceivedMessageSize="65536"
                    messageEncoding="Text" textEncoding="utf-8" transferMode="StreamedResponse"
                    useDefaultWebProxy="true">
                    <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"
                        maxBytesPerRead="4096" maxNameTableCharCount="16384" />
                    <security mode="None">
                        <transport clientCredentialType="None" proxyCredentialType="None"
                            realm="" />
                        <message clientCredentialType="UserName" algorithmSuite="Default" />
                    </security>
                </binding>
            </basicHttpBinding>
        </bindings>
        <client>
            <endpoint address="http://localhost:56881/StreamingService.svc/ep1"
                binding="basicHttpBinding" bindingConfiguration="BasicHttpBinding_IStreamingSample"
                contract="ServiceReference1.IStreamingSample" name="BasicHttpBinding_IStreamingSample" />
        </client>
    </system.serviceModel>
</configuration>

Answer 1

File.OpenRead()是否给您一个位置重置为零的流?如果没有，SetPosition=0，然后返回;