在 ServiceModel 客户端配置部分中，找不到引用协定“IpsBarcode.ScanService”的默认终结点元素。这可能是因为未找到应用程序的配置文件，或者是因为客户端元素中找不到与此协定匹配的终结点元素。

一个类库引用了web service A,用另一个EXE做承载时，访问这个web service A时就提示：“在 ServiceModel 客户端配置部分中，找不到引用协定“IpsBarcode.ScanService”的默认终结点元素。这可能是因为未找到应用程序的配置文件，或者是因为客户端元素中找不到与此协定匹配的终结点元素。”

解决：把类库的App.config中<system.serviceModel>节点下的<bindings>和<client>配置节复制到EXE程序的App.config中（WindowsFormsHost.exe.config）：

<?xml version="1.0" encoding="utf-8" ?>
<configuration>

  <system.serviceModel>
    <bindings>
      <basicHttpBinding>
        <binding name="WSOrderQuerySoapBinding" />
        <binding name="WSRefundSoapBinding" />
        <binding name="WSScanSoapBinding" />
      </basicHttpBinding>
    </bindings>
    <client>
      <endpoint address="http://newpay.ips.com.cn:80/psfp-entry/services/order"
        binding="basicHttpBinding" bindingConfiguration="WSOrderQuerySoapBinding"
        contract="IpsOderQuery.OrderQueryService" name="WSOrderQuerySoap" />
      <endpoint address="http://newpay.ips.com.cn:80/psfp-entry/services/refund"
        binding="basicHttpBinding" bindingConfiguration="WSRefundSoapBinding"
        contract="IpsRefund.RefundService" name="WSRefundSoap" />
      <endpoint address="http://thumbpay.e-years.com/psfp-webscan/services/scan"
        binding="basicHttpBinding" bindingConfiguration="WSScanSoapBinding"
        contract="IpsBarcode.ScanService" name="WSScanSoap" />
    </client>

  </system.serviceModel>

</configuration>