帮助将二维数组存储在Web服务的Cache中 [英] Help with 2-dimentional array to store in Cache for Web service

问题描述

我正在为电影院预订应用程序创建一个Web服务.我希望能够保留席位，行和名称.我使用了二维数组，并且希望将其存储在缓存中，以便可以保留座位和行.这是我的代码，但是给出了错误:

System.Web.Services.Protocols.SoapException:服务器无法处理请求. ---> System.NullReferenceException:对象引用未设置为对象的实例.
在System.Web.Caching.Cache.get_Item(字符串键)
在CinemaReservation \ CinemaReservation \ Service1.asmx.cs:第54行的CinemaReservation.Service1.ReserveSeat(ReserveSeatRequest req)中


service.asmx:

I am creating a web service for cinema reservation application. I want to able to reserve the seat, row and name for the reservation. I have used an 2-dimensional array and I want to able to store it in cache so the seat and row can be reserved. Here is my code, but its given an error:

System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> System.NullReferenceException: Object reference not set to an instance of an object.
at System.Web.Caching.Cache.get_Item(String key)
at CinemaReservation.Service1.ReserveSeat(ReserveSeatRequest req) in CinemaReservation\CinemaReservation\Service1.asmx.cs:line 54


The service.asmx:

namespace CinemaReservation
{
    /// <summary>
    /// Summary description for Service1
    /// </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 Service1 : System.Web.Services.WebService
    {
        public enum Seat
        {
            seat1,
            seat2,
            seat3,
            seat4
        }
        public enum Row
        {
            row1,
            row2,
            row3,
            row4
        }
        
        public class ReserveSeatRequest
        {
            public string name;
            public int row, seat;            
        }

        public class ReserveSeatResponse
        {
            public string name;
            public Seat seat;
            public Row row;
        }

        [WebMethod]
        public ReserveSeatResponse ReserveSeat(ReserveSeatRequest req)
        {
            ReserveSeatResponse resp = new ReserveSeatResponse();
            Cache myCache =  new Cache();
            
            string[,] ArraySeat = (string[,])myCache[req.name];

            if (ArraySeat == null)
            {
                ArraySeat = new string [req.row, req.seat];
                myCache[req.name] = ArraySeat;
            }else{//seat taken code}
              

            resp.row = (Row)req.row;
            resp.seat = (Seat)req.seat;
            resp.name = req.name;
            return resp;         

        }
    }
}

The client application, form.cs:

namespace CinemaClient
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void rsvSeatButton_Click(object sender, EventArgs e)
        {
            ReserveSeatService.ReserveSeatRequest req =
                new ReserveSeatService.ReserveSeatRequest();
            req.name = nameTextBox.Text;
            req.row = int.Parse(rowTextBox.Text) -1;
            req.seat = int.Parse(seatTextBox.Text) - 1;
            ReserveSeatService.Service1SoapClient client =
                new ReserveSeatService.Service1SoapClient();
            ReserveSeatService.ReserveSeatResponse resp =
                client.ReserveSeat(req);
            reserveNameText.Text = resp.name;
            reserveRowText.Text = resp.row.ToString();
            reserveSeatTextBox.Text = resp.seat.ToString();
        }

    }
}

有人请帮帮我

Please help me out, someone

推荐答案

您正在尝试从未初始化的catch(myCache)中获取价值.

Hi,

You are trying to get value from uninitialized catch (myCache).

Cache myCache =  new Cache();
string[,] ArraySeat = (string[,])myCache[req.name];

谢谢，

我尝试初始化，但仍然是相同的错误.

Thanks,

I tried initializing, But still the same error.

Cache myCache =  new Cache();

myCache[req.name] = null;

string[,] ArraySeat = (string[,])myCache[req.name];

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