WCF大数据传输

一、影响因素

WCF传输数据的能力受到许多因素的制约，如果程序中出现需要传输的数据量较大而导致调用WCF服务失败的问题，应注意以下配置。

1. MaxReceivedMessageSize

可以接收的消息的最大大小。对于缓冲传输（TransferMode设置为Buffered），MaxBufferSize的值应始终等于MaxReceivedMessageSize的值。示例代码：

2. ReaderQuotas

处理的SOAP消息的复杂性约束。一般需要设置该属性的MaxArrayLength、MaxStringContentLength及MaxDepth属性。示例代码：

 

3. MaxItemsInObjectGraph

要序列化和反序列化的最大项数。该属性属于DataContractSerializer类。示例代码：

4. MaxRequestLength

请求的最大大小。WCF传输数据量的能力还受到HttpRuntime设置的制约。示例代码：

二、注意事项

1. 查看WCF错误信息

将如下代码加入到服务端的配置文件中，错误信息将输出到指定路径。

  <system.diagnostics>

    <sources>

      <sourcename="System.ServiceModel"switchValue="Warning"propagateActivity="true">

        <listeners>

          <addname="xml" />

        </listeners>

      </source>

    </sources>

    <sharedListeners>

      <addname="xml"type="System.Diagnostics.XmlWriterTraceListener"initializeData="d:\wcf.svclog" />

    </sharedListeners>

  </system.diagnostics>

2. 在服务端添加服务，通过Endpoint与客户端关联

3.更新服务将导致客户端Endpoint的behaviorConfiguration配置丢失

4.更新服务失败

提示错误如图：

 

解决此问题，需要至少在服务端的配置中存在如下代码：

 

 

与此错误相关的其他原因，此处不做说明。

三、以PDPWcfService为实例进行配置

1. 客户端配置

  <system.serviceModel>

    <bindings>

      <basicHttpBinding>

        <bindingname="basicHttpBinding"closeTimeout="00:10:00"

          openTimeout="00:10:00"receiveTimeout="00:10:00"sendTimeout="00:10:00"

          allowCookies="false"bypassProxyOnLocal="false"hostNameComparisonMode="StrongWildcard"

          maxBufferSize="2147483647"maxBufferPoolSize="2147483647"maxReceivedMessageSize="2147483647"

          messageEncoding="Text"textEncoding="utf-8"transferMode="Buffered"

          useDefaultWebProxy="true">

          <readerQuotasmaxDepth="64"maxStringContentLength="2147483647"maxArrayLength="2147483647"

            maxBytesPerRead="2147483647"maxNameTableCharCount="2147483647" />

          <securitymode="None">

            <transportclientCredentialType="None"proxyCredentialType="None"

              realm="" />

            <messageclientCredentialType="UserName"algorithmSuite="Default" />

          </security>

        </binding>

      </basicHttpBinding>

    </bindings>

    <behaviors>

      <endpointBehaviors>

        <behaviorname="endpointBehavior">

          <dataContractSerializermaxItemsInObjectGraph="2147483647"/>

        </behavior>

      </endpointBehaviors>

      <serviceBehaviors>

        <behaviorname="serviceBehavior">

          <dataContractSerializermaxItemsInObjectGraph="2147483647"/>

        </behavior>

      </serviceBehaviors>

    </behaviors>

    <client>

      <endpointname="BasicHttpBinding_IPDPWcfService"address="http://localhost:1002/PDPWcfService.svc"

                binding="basicHttpBinding"contract="PDPWcfServiceProxy.IPDPWcfService"

                bindingConfiguration="basicHttpBinding"behaviorConfiguration="endpointBehavior" />

    </client>

  </system.serviceModel>

2. 服务端配置

  <system.serviceModel>

    <bindings>

      <basicHttpBinding>

        <bindingname="basicHttpBinding"closeTimeout="00:10:00"

          openTimeout="00:10:00"receiveTimeout="00:10:00"sendTimeout="00:10:00"

          allowCookies="false"bypassProxyOnLocal="false"hostNameComparisonMode="StrongWildcard"

          maxBufferSize="2147483647"maxBufferPoolSize="2147483647"maxReceivedMessageSize="2147483647"

          messageEncoding="Text"textEncoding="utf-8"transferMode="Buffered"

          useDefaultWebProxy="true">

          <readerQuotasmaxDepth="64"maxStringContentLength="2147483647"maxArrayLength="2147483647"

            maxBytesPerRead="2147483647"maxNameTableCharCount="2147483647" />

          <securitymode="None">

            <transportclientCredentialType="None"proxyCredentialType="None"

              realm="" />

            <messageclientCredentialType="UserName"algorithmSuite="Default" />

          </security>

        </binding>

      </basicHttpBinding>

    </bindings>

    <behaviors>

      <endpointBehaviors>

        <behaviorname="endpointBehavior">

          <dataContractSerializermaxItemsInObjectGraph="2147483647"/>

        </behavior>

      </endpointBehaviors>

      <serviceBehaviors>

        <behaviorname="serviceBehavior">

          <dataContractSerializermaxItemsInObjectGraph="2147483647"/>

        </behavior>

        <!--保留下面的配置，否则不能更新服务 BEGIN-->

        <behaviorname="">

          <serviceMetadatahttpGetEnabled="true" />

          <serviceDebugincludeExceptionDetailInFaults="false" />

        </behavior>

        <!--保留下面的配置，否则不能更新服务 END-->

      </serviceBehaviors>

    </behaviors>

    <services>

      <servicename="RongCheng.ZhiJiaoPingTai.PDP.WcfService.PDPWcfService">

        <endpointname="BasicHttpBinding_IPDPWcfService"address=""

                binding="basicHttpBinding"contract="RongCheng.ZhiJiaoPingTai.PDP.WcfService.IPDPWcfService"

                bindingConfiguration="basicHttpBinding"behaviorConfiguration="endpointBehavior" />

      </service>

    </services>

    <serviceHostingEnvironmentmultipleSiteBindingsEnabled="true" />

  </system.serviceModel>

3.传输大数据实例

请参见同级目录的“20130529 WCF传输大数据实例.rar”。