C# 为windows phone使用Linq到sql

我正在尝试显示我的Windows8应用程序的历史记录，包括日期、时间、楼层、区域、经度和纬度。我尝试了下面的代码，但上面没有输出

你可以在下面的链接上看到我想在我的应用程序上显示的图像。但是当我运行我的程序时，我什么也看不到

我有三个类用于使用LINQtoSQL检索数据库并通过它显示信息。主要类是History.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Navigation;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Shell;
using System.IO.IsolatedStorage;   
using System.Data.Linq;
using System.Data.Linq.Mapping;
using System.ComponentModel;
using System.Collections.ObjectModel;
using System.Text;
using System.Data.Linq;


namespace SmartParking
{

public partial class History : PhoneApplicationPage
{
    private readonly HistoryDataContext historylog; 
    public History()
    {
        InitializeComponent();
       // createDB();





    }

    public HistoryDataContext Log
    {
        get { return historylog; }
    }

    public void createDB()
    {
        using (HistoryDataContext historylog = new HistoryDataContext(HistoryDataContext.DBConnectionString))
        {
            if (historylog.DatabaseExists() == false)
            {
                historylog.CreateDatabase();
                addDataDB();
            }
        }

    }

    public void addDataDB()
    {
        using (HistoryDataContext historylog = new HistoryDataContext(HistoryDataContext.DBConnectionString))
        {
            HistoryDB hdb = new HistoryDB
            {
               // Date = DateTime.Today,
               // Time = DateTime.Now.TimeOfDay,
                Zone = Checkin.Zone_st,
                Floor = Checkin.Floor_st,
                location_latitude = Checkin.Latitud_do,
                location_longtitud = Checkin.Longtitude_do
            };
            historylog.history.InsertOnSubmit(hdb);
            historylog.SubmitChanges();
            GetHistoryLog();

        }
    }
    public IList<HistoryDB> GetHistoryLog()
    {
        IList<HistoryDB> HistoryList = null;
        using (HistoryDataContext historylog = new HistoryDataContext(HistoryDataContext.DBConnectionString))
        {
            IQueryable<HistoryDB> query = from histoy in historylog.history select histoy;
            HistoryList = query.ToList();
        }
        return HistoryList ;
    }


}
}

下一个类是HistoryDataContext.cs

public class HistoryDataContext:DataContext 
{
    public static string DBConnectionString = "Data Source=isostore:/History.sdf";
    public HistoryDataContext(string DBConnectionString)
        : base(DBConnectionString)
    {
}

   public Table<HistoryDB> history
    {
        get
        {
            return this.GetTable<HistoryDB>();
        }
    }


}

}

该表的图像位于下面的链接中

试试这个：

在数据库中应该有一个主键，否则它将引发异常，并且不支持TimeSpan的数据类型，因此您需要按照以下步骤获取日期时间或字符串：

[Table]
    public class HistoryDB
    {
        [Column(IsPrimaryKey = true)]
        public int Id { get; set; }

        [Column(CanBeNull = false)]
        public DateTime Date
        { get; set; }

        [Column(CanBeNull = false)]
        public DateTime Time
        { get; set; }

        [Column(CanBeNull = false)]
        public String Zone
        { get; set; }

        [Column(CanBeNull = false)]
        public String Floor
        { get; set; }

        [Column(CanBeNull = false)]
        public double location_latitude
        { get; set; }

        [Column(CanBeNull = false)]
        public double location_longtitud
        { get; set; }

    }

        public void addDataDB()
        {
            using (HistoryDataContext historylog = new HistoryDataContext(HistoryDataContext.DBConnectionString))
            {
                HistoryDB hdb = new HistoryDB
                {
                    Id = 0,
                     Date = DateTime.Today,
                    Time = DateTime.Now,
                    Zone = "Zone",
                    Floor = "Floore",
                    location_latitude = 00.00,
                    location_longtitud = 00.00
                };
                historylog.history.InsertOnSubmit(hdb);
                historylog.SubmitChanges();
                GetHistoryLog();

            }
        }

---

我已经实现了上述内容，并且工作正常

您有什么想法要补充到您的问题中吗？在视图中，您是否创建了到表的绑定？不，我不知道有关视图的任何信息以及如何创建到表的绑定。很抱歉，我太傻了，但我只是一个初学者。您能在这方面帮助我吗？或者至少为我提供链接，以便我了解与我的代码相关的视图和绑定吗？您真的打算运行SQL吗手机上的服务器？我需要保存的数据不多，所以我想使用Linq to sql和本地数据库在Windows phone上使用sql Server Compact（.sdf）很好，尽管我在iOS和Android上也只使用过SQLite。如果是简单数据或不是那么多，您也可以创建类并将填充的对象存储在IsolatedStorage中。我发现这很有效。由于AB已经回答了您的问题，我认为您不需要视图解释？谢谢您的帮助，但它仍然不起作用，它在历史页面上没有显示任何内容。我尝试的是从NFC标签获取信息，并将其存储在本地数据库中，然后在历史页面中检索它。这将是数据绑定错误。我试过以上数据，效果很好。因此，如果这个答案对你有帮助，请接受它，以供将来其他人参考。我认为你们应该编辑问题，并将其添加到问题而不是答案中。我会为它做负面标记。小心，请不要一个接一个地增加您的查询，让它在一个问题中变得清晰。您能建议我如何克服这个绑定错误吗？首先检查您是否从正在尝试的函数中获取数据，然后如果数据有效且从函数中获取，请检查您的绑定属性是否正确绑定。这是检查数据是否有效的一个很好的步骤，但是关于绑定，数据库中的数据是通过list属性显示自己，还是必须在History.xaml中添加一些内容以显示为行和列

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Navigation;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Shell;
using System.Runtime.InteropServices.WindowsRuntime;
using Windows.Networking.Proximity;
using NdefLibrary.Ndef;
using NdefLibraryWp.Ndef;
using Windows.Networking.Sockets; // needed for DataReader, DataWriter
using Windows.UI.Popups;
using Microsoft.Phone.UserData;
using System.Text;
using Windows.Phone.PersonalInformation;
using SmartParking.Resources;
using System.Diagnostics;


namespace SmartParking
{

public partial class Checkin : PhoneApplicationPage
{
    private ProximityDevice _device;
    private long _subscriptionIdNdef;

    public static double Latitud_do { get; set; }
    public static double Longtitude_do { get; set; }
    public static string Floor_st { get; set; }
    public static string Zone_st { get; set; }

    History store = new History();


    public Checkin()
    {
        InitializeProximityDevice();
        InitializeComponent();


    }

    private void SetLogStatus(string newStatus)
    {
        Dispatcher.BeginInvoke(() => { if (LogStatus != null) LogStatus.Text = newStatus; });
    }

    private void SetFloorStatus(string newStatus)
    {
        Dispatcher.BeginInvoke(() => { if (FloorStatus != null) FloorStatus.Text = newStatus; });
    }



    private void ApplicationBarIconButton_Click(object sender, System.EventArgs e)
    {
        MessageBox.Show(" ");
    }


    private void InitializeProximityDevice()
    {
        _device = Windows.Networking.Proximity.ProximityDevice.GetDefault();
        if (_device != null)
        {
            _subscriptionIdNdef = _device.SubscribeForMessage("NDEF", MessageReceivedHandler);

        }

    }


    private void MessageReceivedHandler(ProximityDevice sender, ProximityMessage message)
    {
        var rawMsg = message.Data.ToArray();
        var ndefMessage = NdefMessage.FromByteArray(rawMsg);


        ////// Loop over all records contained in the NDEF message
        foreach (NdefRecord record in ndefMessage)
        {

            if (NdefTextRecord.IsRecordType(record))
            {
                // Convert and extract URI info
                var textRecord = new NdefTextRecord(record);
                //var str = textRecord.Text;
                string[] str = textRecord.Text.Split('|');

                var latitude = str[2];
                Latitud_do = double.Parse(latitude);
                var longtitude = str[3];
                Longtitude_do = double.Parse(longtitude);
                var Floor_st = str[0];
                var Zone_st = str[1];


                SetLogStatus("Floor: " + Floor_st + " Zone: " + Zone_st );
                SetFloorStatus("Longitude: " + latitude + "   Longitude: " + longtitude);
                store.addDataDB();

            }
        }
      }
 }

[Table]
    public class HistoryDB
    {
        [Column(IsPrimaryKey = true)]
        public int Id { get; set; }

        [Column(CanBeNull = false)]
        public DateTime Date
        { get; set; }

        [Column(CanBeNull = false)]
        public DateTime Time
        { get; set; }

        [Column(CanBeNull = false)]
        public String Zone
        { get; set; }

        [Column(CanBeNull = false)]
        public String Floor
        { get; set; }

        [Column(CanBeNull = false)]
        public double location_latitude
        { get; set; }

        [Column(CanBeNull = false)]
        public double location_longtitud
        { get; set; }

    }

        public void addDataDB()
        {
            using (HistoryDataContext historylog = new HistoryDataContext(HistoryDataContext.DBConnectionString))
            {
                HistoryDB hdb = new HistoryDB
                {
                    Id = 0,
                     Date = DateTime.Today,
                    Time = DateTime.Now,
                    Zone = "Zone",
                    Floor = "Floore",
                    location_latitude = 00.00,
                    location_longtitud = 00.00
                };
                historylog.history.InsertOnSubmit(hdb);
                historylog.SubmitChanges();
                GetHistoryLog();

            }
        }