c# - 向 Web 服务 C# 添加构造函数

Question

我正在尝试向我的 web 服务添加一个构造函数，它看起来像这样:

public class ILotusNotesService : System.Web.Services.WebService
{
    List<Calendar> cal = new List<Calendar>();
    [WebMethod]
    public List<Calendar> GetAllCal(string room)
    {
        DateTime d_start = new DateTime(2012,1,3,12,30,0);
        DateTime d_end = new DateTime(2012, 1, 3, 13, 00, 0);
        Calendar c1 = new Calendar("Søren Steffensen", "Mødelokale 1", "Privat", d_start, d_end);
        DateTime d_start2 = new DateTime(2012, 1, 3, 13, 30, 0);
        DateTime d_end2 = new DateTime(2012, 1, 3, 14, 00, 0);
        Calendar c2 = new Calendar("Knud Olesen", "Mødelokale 1", "Privat", d_start2, d_end2);
        DateTime d_start3 = new DateTime(2012, 1, 3, 15, 30, 0);
        DateTime d_end3 = new DateTime(2012, 1, 3, 16, 00, 0);
        Calendar c3 = new Calendar("Morten Nielsen", "Mødelokale 1", "Miljø Politik", d_start3, d_end3);
        cal.Add(c1);
        cal.Add(c2);
        cal.Add(c3);
        return cal;
    }

构造器看起来像这样

[DataContract(Name = "Calendar")]
public class Calendar: System.Web.Services.WebService
{
    [DataMember(Name = "_meetingHolder")]
    public String _meetingHolder { get; set; }

    [DataMember(Name = "_meetingRoom")]
    public String _meetingRoom { get; set; }

    [DataMember(Name = "_status")]
    public String _status { get; set; }

    [DataMember(Name = "_startTime")]
    public DateTime _startTime { get; set; }

    [DataMember(Name = "_endTime")]
    public DateTime _endTime { get; set; }


    public Calendar(string meetingHolder, string MeetingRoom,string status, DateTime startTime, DateTime endTime)
    {
        this._meetingHolder = meetingHolder;
        this._meetingRoom = MeetingRoom;
        this._status = status;
        this._startTime = startTime;
        this._endTime = endTime;
    }
}

但我一直收到这个错误:

LotusNotesServiveLibrary.Calendar cannot be serialized because it does not have a default public constructor

Answer 1

在编写可以序列化的对象时，必须提供一个没有参数的构造函数(默认构造函数):

public Calendar()

原因是当对象被反序列化时，反序列化器必须有一个创建对象实例的默认方式。