WCF IMetadataExchange Error

Question

I have created a service host with following configuration.

<?xml version="1.0"?>
<configuration>
  <system.serviceModel>
    <services>
      <service name="MathServiceLib.MathService" behaviorConfiguration="myMathServiceBehave">
        <host>
          <baseAddresses>
            <add baseAddress="http://localhost:9001/MathService"/>
            <add baseAddress="net.tcp://localhost:9002/MathService"/>
          </baseAddresses>
        </host>
        <endpoint address="http://localhost:9001/MathService" binding="basicHttpBinding" contract="MathServiceLib.IMathService"/>
        <endpoint address ="net.tcp://localhost:9002/MathService" binding ="netTcpBinding" contract="MathServiceLib.IMathService"/>
        <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>
        <!--<endpoint address="mex" binding="mexTcpBinding" contract="IMetadataExchange"/>-->
      </service>
    </services>
    <behaviors>
      <serviceBehaviors>
        <behavior name="myMathServiceBehave">
          <!--<serviceMetadata httpGetEnabled="true"/>-->
        </behavior>
      </serviceBehaviors>
    </behaviors>
  </system.serviceModel>
</configuration>

I don't want to use serviceMetadata httpGetEnabled="true" property instead I want to use MEX binding for proxy creation.

Now when I start my service using

 svcHost = new ServiceHost(typeof(MathServiceLib.MathService));
 svcHost.Open();

I get following error, please help.

The contract name 'IMetadataExchange' could not be found in the list of contracts implemented by the service MathService. Add a ServiceMetadataBehavior to the configuration file or to the ServiceHost directly to enable support for this contract.

Have you implemented the IMetadataExchange Interface (as defined in your endpoint)? Or do you just want to introduce another way of connecting to your IMathService? Maybe you are missing the System.ServiceModel.Description repository? — Jan Hommes

Seymour Seymour · Accepted Answer · 2013-12-13T15:21:56

Based on my experience, you need to specify

<serviceMetadata httpGetEnabled="true"/>

if you want to use

<endpoint address="mex" binding="mexTcpBinding" contract="IMetadataExchange"/>

The following articles provide comprehensive information and examples:
http://msdn.microsoft.com/en-us/library/ms734765(v=vs.110).aspx
http://www.c-sharpcorner.com/UploadFile/81a718/wcf-service-faqs-part-2/

WCF IMetadataExchange Error

1 Answers