Web services 如何在webconfig中添加bindingExtensions？

我只想添加bindingExtensions，我不知道在添加bindingExtensions时应该在type属性中写什么。这是我的配置：

<system.serviceModel>
<extensions>
  <bindingExtensions>
    <add name="MaxClockSkewBinding" type="Microsoft.ServiceModel.Samples.MaxClockSkewBinding, MaxClockSkewBinding,  
            Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
  </bindingExtensions>
</extensions>
<bindings>
  <customBinding>
    <binding name="MaxClockSkewBinding">
      <transactionFlow />
      <security authenticationMode="SecureConversation">
        <secureConversationBootstrap authenticationMode="UserNameOverTransport">
          <localClientSettings maxClockSkew="00:30:00" />
        </secureConversationBootstrap>
        <localClientSettings maxClockSkew="00:30:00" />
      </security>
      <httpsTransport />
    </binding>
  </customBinding>

运行程序时，错误为：

找不到配置绑定扩展“system.serviceModel/bindings/MaxClockSkewBinding”。验证此绑定扩展是否已在system.serviceModel/extensions/bindingExtensions中正确注册，并且拼写正确

这就是我如何使用我的服务：

channelFactory = new ChannelFactory<TProxy>("*");
            channelFactory.Credentials.ServiceCertificate.Authentication.CertificateValidationMode = X509CertificateValidationMode.None;                
            //channelFactory.Credentials.ServiceCertificate.Authentication.RevocationMode = X509RevocationMode.NoCheck;
            //channelFactory.Credentials.ClientCertificate.Certificate = new X509Certificate2(Certificate, CertificatePass);
            channelFactory.Credentials.UserName.UserName = UserName;
            channelFactory.Credentials.UserName.Password = PassWord;
            var proxy = (IClientChannel)channelFactory.CreateChannel();

channelFactory=新的channelFactory（“*”）；
channelFactory.Credentials.ServiceCertificate.Authentication.CertificateValidationMode=X509CertificateValidationMode.None；
//channelFactory.Credentials.ServiceCertificate.Authentication.RevocationMode=X509RevocationMode.NoCheck；
//channelFactory.Credentials.ClientCertificate.Certificate=新的X509Certificate2（证书，CertificatePass）；
channelFactory.Credentials.UserName.UserName=用户名；
channelFactory.Credentials.UserName.Password=密码；
var proxy=（IClientChannel）channelFactory.CreateChannel（）；

在Visual Studio中打开

工具>WCF服务配置编辑器

： 它可以帮助您创建新的WCF服务配置和编辑现有的WCF服务配置