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我得到了这个例外：

由于 EndpointDispatcher 的 ContractFilter 不匹配，无法在接收器处处理具有 Action ' http://tempuri.org/IUserService/HelloWorld ' 的消息。这可能是因为合约不匹配（发送方和接收方之间的操作不匹配）或发送方和接收方之间的绑定/安全不匹配。检查发送方和接收方是否具有相同的合同和相同的绑定（包括安全要求，例如消息、传输、无）。

Web.Config如下

服务器

 <system.serviceModel>
    <services>
      <service behaviorConfiguration="ServiceBehaviour" name="API.UserService">
        <endpoint 
          name ="basic"
          address="" 
          binding="basicHttpBinding" 
          bindingConfiguration ="basicBinding"
          contract="API.IUserService" />
        <endpoint 
          address="mex" 
          binding="mexHttpBinding" 
          contract="IMetadataExchange" />
      </service>
    </services>

    <behaviors>
      <serviceBehaviors>
        <behavior name="ServiceBehaviour">
          <serviceMetadata httpGetEnabled="true"/>
          <serviceDebug includeExceptionDetailInFaults="false"/>
        </behavior>
      </serviceBehaviors>
    </behaviors>

    <bindings>
      <basicHttpBinding>
        <binding name="basicBinding" 
                 maxBufferSize="2147483647"  
                 maxReceivedMessageSize="2147483647">
          <security mode="None"></security>
          <readerQuotas maxStringContentLength="2147483647"  />
        </binding>
      </basicHttpBinding>
    </bindings>
  </system.serviceModel>

客户

        <client>
          <endpoint
            name ="basic"
            address="http://localhost:8080/UserService.svc"
            binding="basicHttpBinding"
            bindingConfiguration ="basicBinding"
            contract="API.IUserService" />
        </client>
      </system.serviceModel>
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