ServiceHost[] host = new ServiceHost[]{
                                emphost,
                                emailHost, 
                                orgHost,
                                uploadHost,
                                roleHost, 
                                loginUserHost,
                                actionInfoHost,
                                modelActionHost};
            Type[] type = {
                            typeof(EmpService),
                            typeof(UserService),
                            typeof(OrgService),
                            typeof(UpLoadService),
                            typeof(RoleService),
                            typeof(LoginUserService),
                            typeof(ActionInfoService),
                            typeof(ModelActionService)
                          };
            for (int i = 0; i < host.Length; i++)
            {
                  host[i] = new ServiceHost(type[i]);
                  //结果为“((System.ServiceModel.Channels.CommunicationObject)(this.emailHost))”为 null
                  //emailHost = new ServiceHost(type[i]);这样子就可以
                 
            }