Question

即使我通过为类ActivityType返回ActivityType.Code属性值，也在DataContract中覆盖了ToString方法。我还没有在客户端上设置ActivityType.Code属性值以绑定grid.can让我知道ToString方法如何对客户端可用。

这是代码库

数据合同

  [DataContract]
    public class Activity
    {
        [DataMember]
        public ActivityType ActivityTypeId { get; set; }
        [DataMember]
        public string Code { get; set; }
        [DataMember]
        public string Description { get; set; }
        [DataMember]
        public EntityStatus Status { get; set; }

    }
    [DataContract]
    public enum EntityStatus
    {
        [EnumMember]
        Active = 0,
        [EnumMember]
        Inactive = 1
    }

    [DataContract]
    public class ActivityType
    {
        [DataMember]
        public string Code { get; set; }
        [DataMember]
        public string Name { get; set; }
        [DataMember]
        public string Description { get; set; }

        public override string ToString()
        {
            if (Code != null)
            {
                return Code.ToString(CultureInfo.InvariantCulture);
            }
            else
            {
                return base.ToString();
            }
        }
    }

服务实施

  public class TimeSheetManagementService : ITimeSheetManagementService
    {
        public List<BusinessEntities.Activity> GetActivities()
        {
            TimeSheetManagementDataController controller = new TimeSheetManagementDataController();


            var activities = controller.GetActivities();
            var activitiesresult = activities.Select(activity => new BusinessEntities.Activity()
                                                                     {
                                                                         ActivityTypeId =
                                                                             new BusinessEntities.ActivityType()
                                                                                 {
                                                                                     Code = activity.ActivityType.Code,
                                                                                     Description =
                                                                                         activity.ActivityType.
                                                                                         Description,
                                                                                     Name = activity.ActivityType.Name
                                                                                 },
                                                                         Code = activity.Code,
                                                                         Description = activity.Description,
                                                                         Status =  (EntityStatus)  Enum.Parse(typeof(EntityStatus),Convert.ToString((activity.Status==true)?1:0))
                                                                     });

            return activitiesresult.ToList();
        }
    }

客户端实施

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False">
            <Columns>
             <asp:BoundField runat="server" DataField="Code"/>

             <asp:BoundField runat="server" DataField="Description"/>

             <asp:BoundField runat="server" DataField="Status"/>

             <asp:BoundField runat="server" DataField="ActivityTypeId"/>
            </Columns>
        </asp:GridView>

输出

  Code Description                   Status    ActivityTypeId
    ACT2    Requirement Feasibility Study Inactive TimeSheetManagementServiceRef.ActivityType
    ACT1    Requirement analysis    Inactive     TimeSheetManagementServiceRef.ActivityType

Answer 1

数据合同用于传输数据 - 而不是用于传输逻辑。使用添加服务引用时，添加Web引用，xsd.exe，wsdl.exe或svcutil.exe仅描述属性 - 在服务器上声明的所有方法都将丢失。有两种方法可以解决这个问题：

丑陋的方式：与服务和客户端之间的数据契约共享库，而不是通过上述工具之一在客户端上创建新类型
这些工具应该创建部分类。您的ToString方法显然属于客户端，因为它与数据表示有关，因此在客户端创建合同类的第二部分部分，并在该类中声明ToString方法。

ToString方法覆盖WCF中的DataContract

1 个答案: