WCF服务和工厂设计模式

Question

我试图在WCF中实现工厂模式，但它不起作用。我创建了一个名为TestServiceLibrary的WCFServiceLibrary项目。然后我创建了名为EmployeeService的wcf服务，它具有IEmployeeService接口。我在ViewAttendance类中定义了SaveAttendance，IEmployeeService方法，并在EmployeeService类中实现。然后，我创建了一个客户端Web应用程序，它通过创建名为“EmployeeServiceRef”的服务引用来使用EmployeeService，并在Default.aspx.cs后面的代码中调用以下方法

EmployeeServiceRef.IEmployeeService obj = new EmployeeServiceRef.EmployeeServiceClient();
obj.ViewAttendance();

它显示了预期的结果。然后在TestServiceLibrary项目中，我创建了另一个名为EmployeeCardReaderService的类，它实现了IEmployeeService接口，因为它还具有ViewAttendance方法但具有不同的实现，因此基本上创建了另一个WCF服务，而没有创建新的接口并配置为 web.config中的新服务。然后在客户端应用程序中我创建了另一个服务引用

EmployeeCardReaderServiceRef：

EmployeeCardReaderServiceRef.IEmployeeService obj2 = new EmployeeCardReaderServiceRef.EmployeeServiceClient();

当我打电话给obj2.ViewAttendance();时，它会调用ViewAttendance() EmployeeService而不是EmployeeCardReaderService。请问是否有可能在wcf服务中实现工厂设计模式？如果它是正确的方式，因为它不适合我。我们也可以将工厂模式应用于asmx webservices吗？

namespace TestServiceLibrary
{
    [ServiceContract(Namespace="http://www.test.com")]
    public interface IEmployeeService
    {
        [OperationContract]
        string ViewAttendance();
        [OperationContract]
        string ViewEmployee();
        [OperationContract]
        string ViewDetails();
    }
}


namespace TestServiceLibrary
{
    public class EmployeeService : IEmployeeService
    {
        public string ShowWork()
        {
            return "";
        }

        #region IEmployeeService Members

        public string ViewAttendance()
        {
            /* TODO. Implementation specific to Device */
            return "EmployeeService Attendance";
        }
        public string ViewEmployee()
        {
            return "Employee Number 1";
        }

        #endregion

        #region IEmployeeService Members


        public string ViewDetails()
        {
            return "Employee Details are as follows";
        }

        #endregion
    }

    class EmployeeCardReaderService : IEmployeeService
    {
        #region IEmployeeService Members

        public string ViewAttendance()
        {
           /*TODO:
            Implementation specific to card reader customer
            */

            return "EmployeeCardReaderService Attendance";
        }

        public string ViewEmployee()
        {
            throw new NotImplementedException();
        }

        public string ViewDetails()
        {
            throw new NotImplementedException();
        }

        #endregion
    }
}

      <service name="TestServiceLibrary.EmployeeService">
        <endpoint address="" binding="basicHttpBinding" contract="TestServiceLibrary.IEmployeeService">
          <identity>
            <dns value="localhost" />
          </identity>
        </endpoint>
        <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
        <host>
          <baseAddresses>
            <add baseAddress="http://localhost/TestServiceLibrary/EmployeeService/" />
          </baseAddresses>
        </host>
      </service>
      <service name="TestServiceLibrary.EmployeeCardReaderService">
        <endpoint address="" binding="basicHttpBinding" contract="TestServiceLibrary.IEmployeeService" />
        <host>
          <baseAddresses>
            <add baseAddress="http://localhost/TestServiceLibrary/EmployeeCardReaderService/" />
          </baseAddresses>
        </host>
      </service>

Answer 1

new EmployeeCardReaderServiceRef.EmployeeServiceClient();

应该读

new EmployeeCardReaderServiceRef.EmployeeCardReaderServiceClient();

现在的方式是，您通过两个引用调用相同的服务。