IMetaDataExchange could not be found in the list of contracts implemented by the service

I have searched the web for resolution of this error, but everything I have found suggests what I have is correct.

Maybe someone could take a look and spot an obvious mistake I just cannot see.

I have a windows service, hosting two contracts:

1. IConfigurationService
2. IConfigurationAdminService

The admin service inherits from the standard service as I want both contracts to implement the basic methods.

The problem is I can host the services fine, until I try and add a MEX.

Then I get the following exception:

The contract name 'IMetaDataExchange' could not be found in the list of c开发者_如何学Pythonontracts implemented by the service 'ConfigurationWCFService'.

And this is my config, everything is configured by config, nothing done through code.

<system.serviceModel>
    <bindings>
      <netTcpBinding>
        <binding name="tcpBinding" maxBufferSize="2147483647" maxReceivedMessageSize="2147483647">
          <readerQuotas maxStringContentLength="2147483647" maxArrayLength="2147483647" />
          <security mode="None" />
        </binding>
      </netTcpBinding>
    </bindings>
    <services>
      <service behaviorConfiguration="serviceBehavior" name="BrightsideGroup.Repa.Configuration.ConfigurationWCFService">
        <endpoint address="ConfigurationService" binding="netTcpBinding"
          bindingConfiguration="tcpBinding" name="tcpConfiguration" contract="BrightsideGroup.Repa.Configuration.IConfigurationWCFService" />
        <endpoint binding="mexHttpBinding" address="mex" name="mex" contract="IMetaDataExchange" />
        <host>
          <baseAddresses>
            <add baseAddress="net.tcp://GD01316:9123/Repa" />
            <add baseAddress="http://GD01316:8123/Repa" />
          </baseAddresses>
        </host>
      </service>
      <service behaviorConfiguration="serviceBehavior" name="BrightsideGroup.Repa.Configuration.ConfigurationWCFAdminService">
        <endpoint address="ConfigurationAdminService" binding="netTcpBinding"
          bindingConfiguration="tcpBinding" name="tcpConfigurationAdmin"
          contract="BrightsideGroup.Repa.Configuration.IConfigurationAdminWCFService" />
        <endpoint binding="mexHttpBinding" address="mex" name="mex" contract="IMetaDataExchange" />
        <host>
          <baseAddresses>
            <add baseAddress="net.tcp://GD01316:9124/Repa" />
            <add baseAddress="http://GD01316:8124/Repa" />
          </baseAddresses>
        </host>
      </service>
    </services>
    <behaviors>
      <serviceBehaviors>
        <behavior name="serviceBehavior">
          <serviceMetadata httpGetEnabled="true" />
        </behavior>
      </serviceBehaviors>
    </behaviors>
  </system.serviceModel>

You have the casing incorrect - the WCF configuration is case-sensitive

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

Note that the "D" is not capitalized in IMetadataExchange You can double check the syntax on MSDN.

I am using NetTcpBinding for all. In my case I was having the same issue and resolved it by adding:

(a) a behaviourConfiguration="" to the mex endpoint

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

(b) a behaviourConfiguration="mex" to the service definition:

<services>
    <service name="AcmeService" behaviourConfiguration="mex">

(c) The behaviour entry

<behaviors>
    <serviceBehaviors>
        <behaviour name="mex">
            <serviceDebug includeExceptionDetailInFaults="false"/>
            <serviceMetadata />
        </behavior>
     </serviceBehaviors>
 </behaviors>

I hope the following link may provide you the help.

And also try adding the following :

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