WCF maxReceivedMessageSize不能设置超过4215

Question

我想在WCF客户端的App.config中设置maxReceivedMessageSize.

如果maxReceivedMessageSize等于或小于4215则可以正常工作.虽然将其设置为4216或高于它的任何值时,将采用默认值65536.

我的客户代码

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
    </startup>
    <system.serviceModel>
        <bindings>
            <basicHttpBinding>
                <binding name="BasicHttpBinding_IConexaApiServic" maxReceivedMessageSize="4216" />
            </basicHttpBinding>
        </bindings>
        <client>
            <endpoint address="http://svsr02.conexa.local/HelloService/ConexaApiService.svc"
                binding="basicHttpBinding" bindingConfiguration="BasicHttpBinding_IConexaApiServic"
                contract="ConexaApiService.IConexaApiService" name="BasicHttpBinding_IConexaApiService" />
        </client> 
    </system.serviceModel>
</configuration>

和相关的服务器代码

<basicHttpBinding>
        <binding name="BasicHttpEndpoint_MPSAPIServic" maxReceivedMessageSize="2000000">
          <security mode="TransportWithMessageCredential" />
        </binding>
        <binding name="BasicHttpEndpoint_HelloService" receiveTimeout="00:10:00" sendTimeout="00:10:00" maxReceivedMessageSize="2000000">

  </binding>
   </basicHttpBinding>

 <service name="IIS_test123.HelloService">
        <endpoint address="ConexaApi" binding="basicHttpBinding" bindingConfiguration="BasicHttpEndpoint_HelloService" contract="IIS_test123.IHelloService"></endpoint>
        <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
        <host>
          <baseAddresses>
            <add baseAddress="http://localhost:8733/API/ConexaApiService" />
          </baseAddresses>
        </host>
      </service>
    </services>

知道如何解决这个问题吗？

Answer 1

这是可以解释的。如果你看看你的例外情况：

• System.ServiceModel.CommunicationException 是客户端抛出的异常。它具有来自客户端的 maxReceivedMessageSize。一切安好。
• FaultException：此异常是 SOAP 错误，它将异常从服务传播到客户端应用程序。（http://www.codeproject.com/Articles/799258/WCF-Exception-FaultException-FaultContract）。所以这个异常其实是来自服务端的！maxReceivedMessageSize 是默认值，与服务器配置中的 maxReceivedMessageSize 不对应。您在客户端中连接到的地址是服务地址，未配置 maxReceivedMessageSize，也不是配置了 maxReceivedMessageSize="2000000" 的端点地址 ConexaApi。这就是为什么您会得到默认值 65536。

如果您认为增加消息大小不会引发异常，则 4215 必须是消息的大小。