使用sqlce数据库在Windows Phone中获取未指定的错误

Question

我的sqlCe数据库中有一个名为“dic”的表，它是一个字典数据库。它有两列名为english，bangla。 我有一个文本框和一个搜索按钮。通过使用此按钮和文本框，我可以搜索单词，匹配英文列和输入文本。现在我想显示与英文列匹配的TOP 5结果并将文本输入到列表框中。在列表框中，第一行将显示“english”列的数据，第二行将包含搜索结果中“bangla”列的数据。因此列表框将包含总计5 * 2 = 10行。 我尝试了一些非常初始但却出错：

 condrokotha_newContext db = null;

    // Constructor
    public MainPage()
    {
        InitializeComponent();


        db = new condrokotha_newContext(condrokotha_newContext.ConnectionString);

        //db.Dispose();
        db.CreateIfNotExists();
        db.LogDebug = true;

    }


 private void button1_Click(object sender, RoutedEventArgs e)
    {

        if (db!=null)
        {

            var contacts = (from m in db.Dics where m.English.Contains(@"abandon") select m.English);
            List<string> listBoxItems = new List<string>();
            string s;

            try{

            foreach (var a in contacts)
            {
                s = a;
                listBoxItems.Add(s);

                }
            }
            catch (Exception ex){ MessageBox.Show(ex.ToString()); }

            listBox1.ItemsSource = listBoxItems;
        }           
    }

它有一个例外“Unsoecified error”。

我怎样才能做我想要的事情????

N：B：我在下面给出了使用数据库的代码。

#pragma warning disable 1591
//------------------------------------------------------------------------------
// <auto-generated>
//     This code was generated by a tool.
//     Runtime Version:4.0.30319.18010
//
//     Changes to this file may cause incorrect behavior and will be lost if
//     the code is regenerated.
 // </auto-generated>
 //------------------------------------------------------------------------------

 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
 using System.Data.Linq;
 using System.Data.Linq.Mapping;
 using System.Linq;
 using System.Linq.Expressions;
 using System.Reflection;


using System.IO;
using System.IO.IsolatedStorage;
using Microsoft.Phone.Data.Linq.Mapping;
using Microsoft.Phone.Data.Linq;


public class DebugWriter : TextWriter
{
private const int DefaultBufferSize = 256;
private System.Text.StringBuilder _buffer;

public DebugWriter()
{
    BufferSize = 256;
    _buffer = new System.Text.StringBuilder(BufferSize);
  }

public int BufferSize
{
    get;
    private set;
}

public override System.Text.Encoding Encoding
{
    get { return System.Text.Encoding.UTF8; }
}

#region StreamWriter Overrides
public override void Write(char value)
{
    _buffer.Append(value);
    if (_buffer.Length >= BufferSize)
        Flush();
}

public override void WriteLine(string value)
{
    Flush();

    using(var reader = new StringReader(value))
    {
        string line; 
        while( null != (line = reader.ReadLine()))
            System.Diagnostics.Debug.WriteLine(line);
    }
}

protected override void Dispose(bool disposing)
{
    if (disposing)
        Flush();
}

public override void Flush()
{
    if (_buffer.Length > 0)
    {
        System.Diagnostics.Debug.WriteLine(_buffer);
        _buffer.Clear();
    }
}
#endregion
}


public partial class condrokotha_newContext : System.Data.Linq.DataContext
{

public bool CreateIfNotExists()
{
    bool created = false;
    using (var db = new condrokotha_newContext(condrokotha_newContext.ConnectionString))
    {
        if (!db.DatabaseExists())
        {
            string[] names = this.GetType().Assembly.GetManifestResourceNames();
            string name = names.Where(n => n.EndsWith(FileName)).FirstOrDefault();
            if (name != null)
            {
                using (Stream resourceStream = Assembly.GetExecutingAssembly().GetManifestResourceStream(name))
                {
                    if (resourceStream != null)
                    {
                        using (IsolatedStorageFile myIsolatedStorage = IsolatedStorageFile.GetUserStoreForApplication())
                        {
                            using (IsolatedStorageFileStream fileStream = new IsolatedStorageFileStream(FileName, FileMode.Create, myIsolatedStorage))
                            {
                                using (BinaryWriter writer = new BinaryWriter(fileStream))
                                {
                                    long length = resourceStream.Length;
                                    byte[] buffer = new byte[32];
                                    int readCount = 0;
                                    using (BinaryReader reader = new BinaryReader(resourceStream))
                                    {
                                        // read file in chunks in order to reduce memory consumption and increase performance
                                        while (readCount < length)
                                        {
                                            int actual = reader.Read(buffer, 0, buffer.Length);
                                            readCount += actual;
                                            writer.Write(buffer, 0, actual);
                                        }
                                    }
                                }
                            }
                        }
                        created = true;
                    }
                    else
                    {
                        db.CreateDatabase();
                        created = true;
                    }
                }
            }
            else
            {
                db.CreateDatabase();
                created = true;
            }
        }
    }
    return created;
}

public bool LogDebug
{
    set
    {
        if (value)
        {
            this.Log = new DebugWriter();
        }
    }
}

public static string ConnectionString = "Data Source=isostore:/condrokotha_new.sdf";

public static string ConnectionStringReadOnly = "Data Source=appdata:/condrokotha_new.sdf;File Mode=Read Only;";

public static string FileName = "condrokotha_new.sdf";

public condrokotha_newContext(string connectionString) : base(connectionString)
{
    OnCreated();
}

#region Extensibility Method Definitions
partial void OnCreated();
#endregion

public System.Data.Linq.Table<Dic> Dics
{
    get
    {
        return this.GetTable<Dic>();
    }
}
}

   [global::System.Data.Linq.Mapping.TableAttribute(Name="dic")]
 public partial class Dic
{

private string _English;

private string _Bangla;

public Dic()
{
}

[global::System.Data.Linq.Mapping.ColumnAttribute(Name="english", Storage="_English", DbType="NVarChar(1000)")]
public string English
{
    get
    {
        return this._English;
    }
    set
    {
        if ((this._English != value))
        {
            this._English = value;
        }
    }
}

[global::System.Data.Linq.Mapping.ColumnAttribute(Name="bangla", Storage="_Bangla", DbType="NText", UpdateCheck=UpdateCheck.Never)]
public string Bangla
{
    get
    {
        return this._Bangla;
    }
    set
    {
        if ((this._Bangla != value))
        {
            this._Bangla = value;
        }
    }
}
 }
#pragma warning restore 1591