WCF服务应用程序：操作必须有其类型为流单个参数 [英] WCF Service application: The operation must have a single parameter whose type is Stream

问题描述

可能重复：结果
的 WCF休息用的Webservice流

我正在开发一个。WCF的.NET Framework 4.0与C＃

I'm developing a WCF .NET Framework 4.0 with C#.

我创建这个WCF与此Visual Studio的模板：

I've created this WCF with this Visual Studio Template:

我需要发送有两个或三个参数图像。这是所有的 OperationContract的我有（我所要求的最后一个）：

I need to send an image with two or three parameters. This is all OperationContract that I have (I'm asking for the last one):

[ServiceContract]
public interface IRestServiceImpl
{
    [OperationContract]
    [WebInvoke(Method = "GET",
        ResponseFormat = WebMessageFormat.Json,
        BodyStyle = WebMessageBodyStyle.Bare,
        UriTemplate = "orders/")]
    OrderContract[] allOrders();

    [OperationContract]
    [WebInvoke(Method = "POST",
        ResponseFormat = WebMessageFormat.Json,
        BodyStyle = WebMessageBodyStyle.Bare,
        UriTemplate = "filteredOrders/")]
    OrderContract[] GetOrders(IdsMessage msg);

    [OperationContract]
    [WebInvoke(Method = "POST",
        ResponseFormat = WebMessageFormat.Json,
        BodyStyle = WebMessageBodyStyle.Bare,
        UriTemplate = "completeFilteredOrders/")]
    OrderContract[] LoadCompleteFilteredOrders(IdsMessage msg);

    [OperationContract]
    [WebInvoke(Method = "POST",
        ResponseFormat = WebMessageFormat.Json,
        BodyStyle = WebMessageBodyStyle.Bare,
        UriTemplate = "saveEReports/")]
    Boolean SaveEReports(EReportContract[] eReports);

    [OperationContract]
    [WebInvoke(Method = "POST",
        ResponseFormat = WebMessageFormat.Json,
        BodyStyle = WebMessageBodyStyle.Bare,
        UriTemplate = "saveEReport/")]
    long SaveEReport(EReportContract eReport);

    [OperationContract]
    [WebInvoke(Method = "POST",
        ResponseFormat = WebMessageFormat.Json,
        BodyStyle = WebMessageBodyStyle.Bare,
        UriTemplate = "UploadPhoto/{eReportId}/{imageType}")]
    Boolean UploadPhoto(string eReportId, string imageType, Stream fileContents);
}

这是的Web.config ：

<configuration>
  <system.web>
    <compilation debug="true" targetFramework="4.0" />
  </system.web>
  <system.serviceModel>
    <services>
      <service name="EReportService.RestServiceImpl" behaviorConfiguration="ServiceBehaviour">
        <endpoint address="" binding="webHttpBinding" contract="EReportService.IRestServiceImpl" behaviorConfiguration="web">
        </endpoint>
      </service>
    </services>
    <bindings>
      <webHttpBinding>
        <binding maxReceivedMessageSize="2097152" maxBufferSize="2097152" transferMode="Streamed"/>
      </webHttpBinding>
    </bindings>
    <behaviors>
      <serviceBehaviors>
        <behavior name="ServiceBehaviour">
          <serviceMetadata httpGetEnabled="true"/>
          <serviceDebug includeExceptionDetailInFaults="true"/>
        </behavior>
      </serviceBehaviors>
      <endpointBehaviors>
        <behavior name="web">
          <webHttp/>
        </behavior>
      </endpointBehaviors>
    </behaviors>
    <serviceHostingEnvironment multipleSiteBindingsEnabled="true" />
  </system.serviceModel>
 <system.webServer>
    <modules runAllManagedModulesForAllRequests="true"/>
  </system.webServer>
  <connectionStrings>

  </connectionStrings>
</configuration>

当我运行的服务，我得到了以下异常：

When I run service I get the following exception:

的操作必须有一个类型为流一个参数

The operation must have a single parameter whose type is Stream

如果我这样做：

[OperationContract]
[WebInvoke(Method = "POST",
    ResponseFormat = WebMessageFormat.Json,
    BodyStyle = WebMessageBodyStyle.Bare,
    UriTemplate = "UploadPhoto")]
Boolean UploadPhoto(Stream fileContents);

它可以完美，但我需要与图像发送更多的数据。

It works perfectly but I need to send more data with image.

这服务是暴露的的Android 平板电脑的应用程序。下面的代码显示如何我现在将图片发送到服务器：

This service is exposed for an Android tablet application. The following code show how I'm sending now images to server:

public static Boolean sendImage(String url, String filePath)
{
    try
    {
        MultiValueMap<String, Object> formData;

        Resource resource = new FileSystemResource(filePath);

        // populate the data to post
        formData = new LinkedMultiValueMap<String, Object>();
        formData.add(OrderSpringController.FILE, resource);

        HttpHeaders requestHeaders = new HttpHeaders();
        requestHeaders.setAccept(Collections.singletonList(new MediaType("application","json")));

        // Sending multipart/form-data
        requestHeaders.setContentType(MediaType.MULTIPART_FORM_DATA);

        // Populate the MultiValueMap being serialized and headers in an HttpEntity object to use for the request
        HttpEntity<MultiValueMap<String, Object>> requestEntity = 
                new HttpEntity<MultiValueMap<String, Object>>(formData, requestHeaders);

        GsonHttpMessageConverter messageConverter = new GsonHttpMessageConverter();
        List<HttpMessageConverter<?>> messageConverters = new ArrayList<HttpMessageConverter<?>>();
        messageConverters.add(messageConverter);

        // Create a new RestTemplate instance
        RestTemplate restTemplate = new RestTemplate(true);
        restTemplate.getMessageConverters().add(messageConverter);

        // Make the network request, posting the message, expecting a String in response from the server
        ResponseEntity<Boolean> response = restTemplate.exchange(url, HttpMethod.POST, requestEntity,
                Boolean.class);

        // Return the response body to display to the user
        return response.getBody();
    }
    catch (Exception ex)
    {
        ex.printStackTrace();
    }
    return null;
}

浏览到元数据终结点（的 HTTP：//本地主机：2351 / RestServiceImpl.svc ）

我怎样才能发送图像和参数？

推荐答案

如果您切换到（BasicHttp或WSHttp），然后绑定你可以通过组合包括通过性能所有的自定义参数和Stream对象本身就是一个单一的数据类型实现自己的目标。然后，你正在使用的消息风格的而不是RPC交谈。并请注意[MessageContract]家庭WCF DTO装饰的。

If you switch to (BasicHttp or WSHttp )Binding then you can achieve your goal by composing a single data type including all your custom parameters via properties and the Stream object itself. Then you are making use of messaging style instead of RPC conversation. And pls pay attention to [MessageContract] family of WCF DTO decorators.

[ServiceContract]
public interface ITransferService
{
    [OperationContract]
    RemoteFileInfo DownloadFile(DownloadRequest request);

    [OperationContract]
    void UploadFile(RemoteFileInfo request); 
}
[MessageContract]
public class DownloadRequest
{
    [MessageBodyMember]
    public string FileName;
}

[MessageContract]
public class RemoteFileInfo : IDisposable
{
    [MessageHeader(MustUnderstand = true)]
    public string FileName;

[MessageHeader(MustUnderstand = true)]
public long Length;

[MessageBodyMember]
public System.IO.Stream FileByteStream;

public void Dispose()
{ 
    if (FileByteStream != null)
    {
        FileByteStream.Close();
        FileByteStream = null;
    }
}   

}

}

这有必要的代码 HTTP： //www.codeproject.com/Articles/166763/WCF-Streaming-Upload-Download-Files-Over-HTTP

但我强烈建议<一HREF =http://stackoverflow.com/questions/1339857/wcf-using-streaming-with-message-contracts> WCF：使用带有留言合同并的 http://blogs.msdn.com/b/carlosfigueira/archive /2011/03/25/wcf-streaming-inside-data-contracts.aspx

的这是必须的，以及：）

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