# <service name="WcfServiceLib.Service1">  
#         <host>  
#           <baseAddresses>  
#             <add baseAddress = "http://localhost:9999/WcfStudy3/Service1" />  
#             <add baseAddress = "net.tcp://localhost:8888/WcfStudy3/Service1" />  
#           </baseAddresses> 
[color=#FF0000]问题:
这里是两种绑定方法,怎么会有三种“数据端点”“ <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>  ”从哪里来?

 [/color]
#         </host>  
#         <endpoint address ="serviceEN_1" binding="wsHttpBinding" contract="WcfServiceLib.IService" />  
#         <endpoint address ="serviceEN_2" binding="mexTcpBinding" contract="WcfServiceLib.IService" />  
#         <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>  
#       </service>