C# SQLite查询失败，但仅在脱机时失败

我有一个简单的SQLite方法，它返回一个给定两个参数的类——类型T和要搜索的参数值

public T GetSingleObject<T>(string id) where T:IIdentity, new()
    {
        lock (dbLock)
        {
            using (var sqlCon = new SQLiteConnection(DBPath))
            {
                sqlCon.Execute(Constants.DBClauseSyncOff);
                sqlCon.BeginTransaction();
                string sql = string.Format("SELECT * FROM {0} WHERE id=\"{1}\"", GetName(typeof(T).ToString()), id);
                var data = sqlCon.Query<T>(sql);
                return data[0];
            }
        }
    }

我已经尝试了我能想到的所有方法来访问这张桌子-包括一个直道

sqlCon.ExecuteScalar<MyClass>("SELECT * FROM MyClass");

sqlCon.ExecuteScalar（“从MyClass中选择*）；

没有离线，完美的在线数据

类本身看起来是这样的

using System;
using System.Runtime.Serialization;
using System.Collections.Generic;
using SQLite;

namespace Models
{
public class MyClass : IIdentity
{
    [PrimaryKey]
    public string id { get; set; }

    public string home_id { get; set; }

    public string username { get; set; }

    public string password { get; set; }

    public string firstname { get; set; }

    public string lastname { get; set; }

    public string email { get; set; }

    public bool syncenabled { get; set; }

    public string tradingname { get; set; }

    public string address { get; set; }

    public string town { get; set; }

    public string state { get; set; }

    public string country { get; set; }

    public string securitystamp { get; set; }

    public string password_question { get; set; }

    public string password_answer { get; set; }

    public string mobileServiceAuthenticationToken { get; set; }

    public string providerUserKey { get; set; }

    public string mobiledeviceid { get; set; }

    public DateTime last_login { get; set; }

    public DateTime __createdAt { get; set; }

    public DateTime __updatedAt { get; set; }

    public string user_type { get; set; }

    public bool is_deleted { get; set; }

    public bool account_enabled { get; set; }

    public string subscription_id { get; set; }

    [IgnoreDataMember, Ignore]
    public List<MyUsers> UserModules { get { return AppDelegate.Self.DBManager.GetListOfObjects<MyUsers>("user_id", id); } }

    public override string ToString()
    {
        return string.Format("[MyClasss: id={0}, home_id={1}, username={2}, password={3}, firstname={4}, lastname={5}, email={6}, syncenabled={7}, tradingname={8}, address={9}, town={10}, state={11}, country={12}, securitystamp={13}, password_question={14}, password_answer={15}, mobileServiceAuthenticationToken={16}, providerUserKey={17}, mobiledeviceid={18}, last_login={19}, __createdAt={20}, __updatedAt={21}, user_type={22}, is_deleted={23}, account_enabled={24}, subscription_id={25}, UserModules={26}]", id, home_id, username, password, firstname, lastname, email, syncenabled, tradingname, address, town, state, country, securitystamp, password_question, password_answer, mobileServiceAuthenticationToken, providerUserKey, mobiledeviceid, last_login, __createdAt, __updatedAt, user_type, is_deleted, account_enabled, subscription_id, UserModules);
    }
}

使用系统；
使用System.Runtime.Serialization；
使用System.Collections.Generic；
使用SQLite；
名称空间模型
{
公共类MyClass:身份
{
[主密钥]
公共字符串id{get；set；}
公共字符串home_id{get；set；}
公共字符串用户名{get；set；}
公共字符串密码{get；set；}
公共字符串名{get；set；}
公共字符串lastname{get；set；}
公共字符串电子邮件{get；set；}
公共bool syncenabled{get；set；}
公共字符串tradingname{get；set；}
公共字符串地址{get；set；}
公共字符串{get；set；}
公共字符串状态{get；set；}
公共字符串国家{get；set；}
公共字符串securitystamp{get；set；}
公共字符串密码\u问题{get；set；}
公共字符串密码\u答案{get；set；}
公共字符串mobileServiceAuthenticationToken{get；set；}
公共字符串providerUserKey{get；set；}
公共字符串mobiledeviceid{get；set；}
公共日期时间上次登录{get；set；}
公共日期时间uu createdAt{get；set；}
公共日期时间uu updatedAt{get；set；}
公共字符串用户类型{get；set；}
公共布尔已删除{get；set；}
公共bool帐户启用{get；set；}
公共字符串订阅\u id{get；set；}
[忽略数据成员，忽略]
公共列表UserModules{get{return AppDelegate.Self.DBManager.GetListOfObjects（“user_id”，id）；}
公共重写字符串ToString（）
{
返回string.Format（“[MyClasss:id={0}，home\u id={1}，username={2}，password={3}，firstname={4}，lastname={5}，email={6}，syncenabled={7}，tradingname={8}，address={9}，town 10}，state={11}，country={12}，MobilityStamp={13}，password={14}，password={answer={15}，Authentication 16}，UserKey={={18} ，last_login={19}，_createdAt={20}，_updatedAt={21}，user_type={22}，is_deleted={23}，account_enabled={24}，subscription_id={25}，UserModules={26}，id，home\u id，用户名，密码，firstname，lastname，email，syncenabled，tradingname，地址，城镇，州，国家，securitystamp，密码问题，密码答案，mobileServiceAuthenticationToken，providerUserKey，mobiledeviceid，上次登录，创建数据，更新数据，用户类型，已删除，已启用帐户，订阅id，用户模块）；
}
}

---

脱机时，我看不到任何内容会导致问题。查询总是返回null脱机，数据联机。

旁注：代码尖叫SQL注入。将其更改为使用参数。您的数据库文件位于哪里？我假设是本地的。因此我认为您面临的错误与设备的连接状态无关。我已经检查了数据库的连接，正常工作，其他每个表正常工作并返回值，但这个表总是返回null.ctacke-我在其他地方有SQL保护代码：）

sqlCon.ExecuteScalar<MyClass>("SELECT * FROM MyClass");

using System;
using System.Runtime.Serialization;
using System.Collections.Generic;
using SQLite;

namespace Models
{
public class MyClass : IIdentity
{
    [PrimaryKey]
    public string id { get; set; }

    public string home_id { get; set; }

    public string username { get; set; }

    public string password { get; set; }

    public string firstname { get; set; }

    public string lastname { get; set; }

    public string email { get; set; }

    public bool syncenabled { get; set; }

    public string tradingname { get; set; }

    public string address { get; set; }

    public string town { get; set; }

    public string state { get; set; }

    public string country { get; set; }

    public string securitystamp { get; set; }

    public string password_question { get; set; }

    public string password_answer { get; set; }

    public string mobileServiceAuthenticationToken { get; set; }

    public string providerUserKey { get; set; }

    public string mobiledeviceid { get; set; }

    public DateTime last_login { get; set; }

    public DateTime __createdAt { get; set; }

    public DateTime __updatedAt { get; set; }

    public string user_type { get; set; }

    public bool is_deleted { get; set; }

    public bool account_enabled { get; set; }

    public string subscription_id { get; set; }

    [IgnoreDataMember, Ignore]
    public List<MyUsers> UserModules { get { return AppDelegate.Self.DBManager.GetListOfObjects<MyUsers>("user_id", id); } }

    public override string ToString()
    {
        return string.Format("[MyClasss: id={0}, home_id={1}, username={2}, password={3}, firstname={4}, lastname={5}, email={6}, syncenabled={7}, tradingname={8}, address={9}, town={10}, state={11}, country={12}, securitystamp={13}, password_question={14}, password_answer={15}, mobileServiceAuthenticationToken={16}, providerUserKey={17}, mobiledeviceid={18}, last_login={19}, __createdAt={20}, __updatedAt={21}, user_type={22}, is_deleted={23}, account_enabled={24}, subscription_id={25}, UserModules={26}]", id, home_id, username, password, firstname, lastname, email, syncenabled, tradingname, address, town, state, country, securitystamp, password_question, password_answer, mobileServiceAuthenticationToken, providerUserKey, mobiledeviceid, last_login, __createdAt, __updatedAt, user_type, is_deleted, account_enabled, subscription_id, UserModules);
    }
}