Question

我已经构建了一个WCF服务来上传和下载文件。

服务：在IIS asp.net网站上托管：

[ServiceContract]
public interface IFileTransferService
{
 [OperationContract(IsOneWay = true)]
 void Upload(FileTransferRequest request);
}

[MessageContract()]
public class FileTransferRequest
{
 [MessageHeader(MustUnderstand = true)]
 public string FileName;

 [MessageBodyMember(Order = 1)]
 public System.IO.Stream Data;

}

[AspNetCompatibilityRequirements(RequirementsMode= AspNetCompatibilityRequirementsMode.Required)]
public class FileTransferService : IFileTransferService
{
 public FileTransferService()
 {
  HttpContext httpContext = HttpContext.Current;

  if (httpContext != null)
  {
   httpContext.Response.BufferOutput = false;
  }
 }

 public void Upload(FileTransferRequest request)
 {
  string fileName = System.Guid.NewGuid().ToString() + request.FileName;

  if (ConfigurationManager.AppSettings["UploadPath"] == null)
  {
   throw new ApplicationException("Missing upload path");
  }

  string uploadPath = "/OutputFeeds";
  string filePath = Path.Combine(Path.GetFullPath(HttpContext.Current.Server.MapPath(uploadPath)), fileName);

  FileStream fs = null;
  try
  {
   fs = File.Create(filePath);
   byte[] buffer = new byte[1024];
   int read = 0;
   while ((read = request.Data.Read(buffer, 0, buffer.Length)) != 0)
   {
    fs.Write(buffer, 0, read);
   }
  }
  finally
  {
   if (fs != null)
   {
    fs.Close();
    fs.Dispose();
   }

   if (request.Data != null)
   {
    request.Data.Close();
    request.Data.Dispose();
   }
  }
 }    
}

服务器配置：

<system.serviceModel>
 <serviceHostingEnvironment aspNetCompatibilityEnabled="true">
  </serviceHostingEnvironment>
 <bindings>
  <basicHttpBinding>
  <binding name="HttpBinding_MTOM" messageEncoding="Mtom" transferMode="Streamed" maxBufferSize="2147483647" maxReceivedMessageSize="2147483647">
   <security mode="None">
   <transport clientCredentialType="None" />
   </security>
  </binding>

 </bindings>
 <services>

  <service behaviorConfiguration="FileTransferServiceBehavior"
  name="FileTransferService">
  <endpoint address="" binding="basicHttpBinding" bindingConfiguration="HttpBinding_MTOM"
   contract="IFileTransferService">
   <identity>
   <dns value="localhost" />
   </identity>
  </endpoint>
  <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
  </service>

 </services>
 <behaviors>
  <serviceBehaviors>

  <behavior name="FileTransferServiceBehavior">
   <serviceMetadata httpGetEnabled="true" />
   <serviceDebug includeExceptionDetailInFaults="false" />
  </behavior>

  </serviceBehaviors>
 </behaviors>
 </system.serviceModel>

客户端：从控制台应用程序调用上述服务：

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
 <system.serviceModel>
  <bindings>
   <basicHttpBinding>
    <binding name="BasicHttpBinding_IFileTransferService" 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="2147483647" maxReceivedMessageSize="2147483647"
     messageEncoding="Mtom" textEncoding="utf-8" transferMode="Streamed"
     useDefaultWebProxy="true">
     <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"
      maxBytesPerRead="4096" maxNameTableCharCount="16384" />
     <security mode="None">
      <transport clientCredentialType="None" proxyCredentialType="None"
       realm="">
       <extendedProtectionPolicy policyEnforcement="Never" />
      </transport>
      <message clientCredentialType="UserName" algorithmSuite="Default" />
     </security>
    </binding>

   </basicHttpBinding>
  </bindings>
  <client>
   <endpoint address="http://ht/FileTransferService.svc" binding="basicHttpBinding"
    bindingConfiguration="BasicHttpBinding_IFileTransferService"
    contract="HobbyTown.IFileTransferService" name="BasicHttpBinding_IFileTransferService" />

  </client>
 </system.serviceModel>
</configuration>

客户上传代码：

 string inputFile = @"C:\Client\InputFeeds\FullInventory.zip";
 using (FileStream fs = new FileStream(inputFile, FileMode.Open))
 {
    FileTransferServiceClient proxy = new FileTransferServiceClient();
    proxy.Upload("Inventory.Zip", fs);
    //proxy.Upload(trIn);
 }

注意：如果我将传输模式更改为缓冲在客户端，则可以正常工作，但是如果在客户端上将传输模式设置为流式传输则不会，并且会抛出内存错误。

另一个post for same problem

Answer 1

我想知道流是否被强制在服务端被缓存。什么是FileTransferRequest - 是第三方？ WCF中的流通常要求流是公开的服务方法中唯一的参数。

http://msdn.microsoft.com/en-us/library/ms733742.aspx

“请注意，向以下Echo或ProvideInfo操作添加第二个参数会导致服务模型恢复为缓冲策略并使用流的运行时序列化表示。只有具有单个输入流参数的操作才兼容使用端到端请求流式传输。

此规则同样适用于邮件合同。如以下消息合同中所示，您的消息协定中只能有一个正文成员，即流。如果要与流进行其他信息通信，则此信息必须是消息标头中的信息。邮件正文专门为流内容保留。“

使用TransferMode = Streamed托管在IIS网站上的WCF服务抛出w3wp.exe OutOfMemory异常？

1 个答案: