无法访问已关闭的流

本文关键字：访问 | 更新日期: 2023-09-27 18:05:50

我试图在WCF中接收一个流对象，但当我收到它时，我得到一个关闭的流。下面是我的代码

[OperationContract]
string ProcessPackageUsingStream(FileStream stream, string fileName, string docType, string customerKey, int documentId);

在实现中，我使用这个流对象。

string ProcessPackageUsingStream(FileStream stream, string fileName, string docType, string customerKey, int documentId);
{
     //Stream is closed here
}

这是我的配置文件

<system.serviceModel>
     <serviceHostingEnvironment aspNetCompatibilityEnabled="true"/>
     <bindings>          
             <basicHttpBinding>
             <binding name="TransferService"   maxReceivedMessageSize="2147483647"  maxBufferSize="2147483647" transferMode="Streamed" >
                 <readerQuotas maxDepth="2147483647" maxStringContentLength="2147483647" maxArrayLength="2147483647" maxBytesPerRead="2147483647" maxNameTableCharCount="2147483647"/>
             <security mode="None"> 
             </security> 
           </binding>          
         </basicHttpBinding>
     </bindings>
     <services>
         <service behaviorConfiguration="TransferServiceBehavior" name="TransferService">
              <endpoint  address=""
             binding="basicHttpBinding" bindingConfiguration="TransferService"
                contract ="ITransferService">
                         </endpoint>
          </service>
     </services>
     <behaviors>
         <serviceBehaviors>
             <behavior name="TransferServiceBehavior">
                 <serviceMetadata httpGetEnabled="true" />
               <dataContractSerializer maxItemsInObjectGraph="2147483647" />
                 <serviceDebug includeExceptionDetailInFaults="true" />
                 <serviceThrottling
                      maxConcurrentCalls="500"
                      maxConcurrentSessions="500"
                      maxConcurrentInstances="500"
                    />
             </behavior>
         </serviceBehaviors>
     </behaviors>
 </system.serviceModel>

在客户端，我添加了对该服务的引用，并使用了以下代码

SPCServiceClient service = new SPCServiceClient();
    service.ProcessPackageUsingStream(File.OpenRead(@"D:'Dev'TestData'002160500041.pdf"), "002160500041.pdf", "Test", "VLR@2016", 1211);

无法访问已关闭的流

我解决了这个问题。以下解决方案对我有效。我没有直接将流作为参数传递，而是创建了两个类，一个用于传递参数，另一个用于获取响应，如:

[MessageContract]
    public class RemoteFileInfo : IDisposable
    {
        [MessageHeader(MustUnderstand = true)]
        public string FileName;
        [MessageHeader(MustUnderstand = true)]
        public string DocType;
        [MessageHeader(MustUnderstand = true)]
        public string CustomerKey;
        [MessageHeader(MustUnderstand = true)]
        public string DocumentId;
        [MessageBodyMember(Order = 1)]
        public System.IO.Stream FileByteStream;
        public void Dispose()
        {
            if (FileByteStream != null)
            {
                FileByteStream.Close();
                FileByteStream = null;
            }
        }
    }
[MessageContract]
public class RemoteResponse
{
    [MessageBodyMember(Order = 1)]
    public string Token;
}

然后我更新了WCF服务中的方法:

[OperationContract]
RemoteResponse ProcessPackageUsingStream(RemoteFileInfo remote);

并更新了我的app.config

<bindings>
  <basicHttpBinding>
    <binding name="BasicHttpBinding_IPreProcessor" transferMode="Streamed" maxReceivedMessageSize="2147483647" maxBufferSize="2147483647" >
      <readerQuotas maxDepth = "2147483647"
            maxStringContentLength = "2147483647"
            maxArrayLength = "2147483647"
            maxBytesPerRead = "2147483647"
            maxNameTableCharCount = "2147483647"/>
    </binding>
  </basicHttpBinding>
</bindings>
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