将 Web 服务字段的输入设为可选不是必需的

Question

我创建了一个示例 Web 服务，它会询问用户一些信息并以 JSON 形式返回所有需要的信息。我这里有两个问题

1. 我不想要求用户输入 bot 新日期和续订日期，我想只要求其中一个，而另一个是可选的
2. 如果输入了新日期和续订日期，那么用户将在一个 JSON 中获得所有日期，但我不确定如何将两个列表附加在一起。

如果您需要更多信息，请告诉我，这是我的网络服务代码

    namespace WebServiceTest
    {
        /// <summary>
        /// Summary description for WebServicePrueba
        /// </summary>
        [WebService(Namespace = "http://tempuri.org/")]
        [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
        [System.ComponentModel.ToolboxItem(false)]
        // To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. 
        // [System.Web.Script.Services.ScriptService]
        public class WebServicePrueba : System.Web.Services.WebService
        {
            private string User { get; set; }
            private string UserID { get; set; }
            private DateTime NewServiceDate { get; set; }
            private DateTime NewServicesTo { get; set; }
            private DateTime RenewServiceDate { get; set; }
            private DateTime RenewServiceTo { get; set; }

            [System.Web.Services.WebMethod(Description = "Get Services Received", EnableSession = true)]
            public string getSeviceInformation(string name, string userId, DateTime newServiceDate, DateTime newServicesTo, DateTime renewServiceDate, DateTime renewServiceTo)
            {
                User = name;
                UserID = userId;
                NewServiceDate = newServiceDate;
                NewServicesTo = newServicesTo;
                RenewServiceDate = renewServiceDate;
                RenewServiceTo = renewServiceTo;

                if (User == "prueba" && UserID == "prueba")
                {
                    if (renewServiceDate == DateTime.MinValue || renewServiceTo == DateTime.MinValue)
                    {
                        ArrayList list = this.participant.getAddedTRCTest(newServiceDate, newServicesTo);
                        return JsonConvert.SerializeObject(list);
                    }

                    else if (newServiceDate == DateTime.MinValue || newServicesTo == DateTime.MinValue)
                    {
                        ArrayList list = this.participant.getModifiedTRCTest(renewServiceDate, renewServiceTo);
                        return JsonConvert.SerializeObject(list);
                    }

                    else
                    {
                        ArrayList list = this.participant.getAddedTRCTest(newServiceDate, newServicesTo);
                        ArrayList list2 = this.participant.getModifiedTRCTest(renewServiceDate, renewServiceTo);
                        return JsonConvert.SerializeObject(list);
                    }

                }

                else if (User != "prueba" && UserID == "prueba")
                {
                    return "Please check your username";
                }

                else if (User == "prueba" && UserID != "prueba")
                {
                    return "Please check your UserID";
                }

                else
                {
                    return "Please check both your username and userID";
                }
            }

        }
    }

这是我在运行 web 服务并且不输入日期之一时遇到的错误（即我输入 newServiceDate 和 newServicesTo 但不是 renewServiceDate 和 renewServiceTo 或其他方式

    System.ArgumentException: Cannot convert  to System.DateTime.
    Parameter name: type ---> System.FormatException: String was not recognized as a valid DateTime.
       at System.DateTimeParse.Parse(String s, DateTimeFormatInfo dtfi, DateTimeStyles styles)
       at System.Convert.ToDateTime(String value, IFormatProvider provider)
       at System.String.System.IConvertible.ToDateTime(IFormatProvider provider)
       at System.Convert.ChangeType(Object value, Type conversionType, IFormatProvider provider)
       at System.Web.Services.Protocols.ScalarFormatter.FromString(String value, Type type)
       --- End of inner exception stack trace ---
       at System.Web.Services.Protocols.ScalarFormatter.FromString(String value, Type type)
       at System.Web.Services.Protocols.ValueCollectionParameterReader.Read(NameValueCollection collection)
       at System.Web.Services.Protocols.HtmlFormParameterReader.Read(HttpRequest request)
       at System.Web.Services.Protocols.HttpServerProtocol.ReadParameters()
       at System.Web.Services.Protocols.WebServiceHandler.CoreProcessRequest()

--------------更新-------------- ----------

@Jianping Liu 当我在我的函数中声明可以为空的参数时，我不再能够测试 web 服务，我得到 `测试

测试表单仅适用于以原始类型作为参数的方法。` 这是我的声明方式

 [System.Web.Services.WebMethod(Description = "Get Services Received", EnableSession = true)]
      public string getSeviceInformation(string name, string userId, DateTime? newServiceDate, DateTime? newServicesTo, DateTime? renewServiceDate, DateTime? renewServiceTo)

Answer 1

您可以为您的 4 DateTime 使用可为空的变量

private DateTime? NewServiceDate { get; set; }
private DateTime? NewServicesTo { get; set; }
private DateTime? RenewServiceDate { get; set; }
private DateTime? RenewServiceTo { get; set; }

并使用 NewServiceDate.HasValue 来检查它是否包含一个值。

Answer 2

1. 使用可为空的日期时间

getServiceInformation 方法的签名： public string getServiceInformation(string name, string userId, DateTime?newServiceDate, DateTime?newServicesTo, DateTime?renewServiceDate, DateTime?renewServiceTo)

1. 检查哪些日期有值；

if(newServiceDate.HasValue) .... 在这里做点什么