WCF服务中的缓冲区大小

Question

我们有一个WCF服务,它执行某些存储过程并将结果返回给silverlight客户端.某些存储过程最多返回80K行.

下面给出了web.config for Service中的设置

<system.serviceModel>
    <serviceHostingEnvironment aspNetCompatibilityEnabled="true"/>
    <behaviors>
       <serviceBehaviors>
           <behavior name="MyService.MyServiceBehavior">
               <serviceMetadata httpGetEnabled="true"/>
               <serviceDebug includeExceptionDetailInFaults="true"/>
               <dataContractSerializer maxItemsInObjectGraph="2147483647"/>
           </behavior>
       </serviceBehaviors>
    </behaviors>
    <bindings>
       <basicHttpBinding>
           <binding name="BasicHttpBinding_MyService" 
                maxBufferSize="2147483647" maxReceivedMessageSize="2147483647" 
                receiveTimeout="00:40:00" openTimeout="00:40:00" 
                closeTimeout="00:40:00" sendTimeout="00:40:00">
                <readerQuotas maxDepth="2147483647" 
                    maxStringContentLength="2147483647" maxArrayLength="2147483647" 
                    maxBytesPerRead="2147483647" maxNameTableCharCount="2147483647"/>
                <security mode="None"/>
           </binding>
        </basicHttpBinding>
        <customBinding>
           <binding name="MyService.MyService.customBinding0">
              <binaryMessageEncoding/>
              <httpTransport/>
            </binding>
        </customBinding>
     </bindings>
     <services>
          <service behaviorConfiguration="MyService.MyServiceBehavior" 
                   name="MyService.MyService">
              <endpoint name="BasicHttpBinding_MyService" 
                  address="" 
                  binding="basicHttpBinding" 
                  bindingConfiguration="BasicHttpBinding_MyService" 
                  contract="MyService.IMyService"/>
           </service>
     </services>
</system.serviceModel>

这对客户而言

<system.serviceModel>
    <serviceHostingEnvironment aspNetCompatibilityEnabled="true"/> 
    <behaviors>
       <serviceBehaviors>
           <behavior name="MyService_Behavior">
              <serviceDebug includeExceptionDetailInFaults="true"/>
              <serviceMetadata httpGetEnabled="true"/>
           </behavior>
       </serviceBehaviors>
       <endpointBehaviors>
          <behavior name="r1">
              <dataContractSerializer maxItemsInObjectGraph="2147483647"/>
          </behavior>
       </endpointBehaviors>
    </behaviors>
    <bindings>
       <basicHttpBinding>
            <binding name="BasicHttpBinding_MyService" 
                closeTimeout="00:03:00" openTimeout="00:03:00" 
                receiveTimeout="00:10:00" sendTimeout="00:03:00" 
                allowCookies="false" bypassProxyOnLocal="false" 
                hostNameComparisonMode="StrongWildcard" 
                maxBufferSize="2147483647" maxBufferPoolSize="2147483647" 
                maxReceivedMessageSize="2147483647" 
                messageEncoding="Text" textEncoding="utf-8" 
                transferMode="Buffered" useDefaultWebProxy="true">
               <security mode="None"/>
             </binding>
        </basicHttpBinding>
     </bindings>
     <client>
        <endpoint name="BasicHttpBinding_MyService"
            address="http://localhost:8080/MyService/MyService.svc" 
            behaviorConfiguration="r1"
            binding="basicHttpBinding" 
            bindingConfiguration="BasicHttpBinding_MyService" 
            contract="MyService.IMyService"  />
    </client>
</system.serviceModel>

只要记录数超过20K,服务就会抛出一个错误,如TimeOut或NotFound.为什么你认为这会发生？我该如何解决？

Answer 1

听起来像是纯粹的数据过载。正如评论中所述，分页是一种实用的解决方案。如果有充分的理由需要 80k，您可以尝试使用不同的机制来序列化数据。例如，protobuf 数据通常比 xml小得多，因此您可以尝试在线使用它。但是，由于这是 Silverlight，我（当前）无法自动交换它 - 您需要返回一个byte[]orStream并在服务器/客户端显式处理序列化/反序列化。这应该会大大降低带宽要求（如果您可以将 Silverlight 配置为使用 MTOM，则带宽要求会更低 - 我最近没有检查过，但在某些早期版本中不支持这一点）。