我有个问题。我正在尝试从我的数据库中获取一个值(字符串)。下面是我调用以获取值的代码:
public string SelectValueFromTableSettings(string name)
{
string folder = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal);
try
{
using (var connection = new SQLiteConnection(System.IO.Path.Combine(folder, "Settings.db")))
{
return connection.Query<SettingDb>("SELECT Value FROM SettingDb WHERE Name=?", name).ToString();
}
}
catch (SQLiteException ex)
{
Log.Info("SQLiteEx", ex.Message);
return null;
}
}
下面是将值赋给变量的代码:
string SwitchValue = MainActivity.db.SelectValueFromTableSettings(mItems[position].Name);
我应该得到一个像Nick或Steve这样的值,但我得到的值是:
System.Collections.Generic.List`1CryptoCurrencies.SettingDb
我做错了什么?
发布于 2019-06-12 03:40:50
您将返回一个对象列表。
connection.Query<SettingDb>("SELECT Value FROM SettingDb WHERE Name=?", name).FirstOrDefault().YourProperty.ToString();
或者,简单地返回对象:
public SettingDB SelectValueFromTableSettings(string name)
{
string folder = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal);
try
{
using (var connection = new SQLiteConnection(System.IO.Path.Combine(folder, "Settings.db")))
{
return connection.Query<SettingDb>("SELECT Value FROM SettingDb WHERE Name=?", name).FirstOrDefault();
}
}
catch (SQLiteException ex)
{
Log.Info("SQLiteEx", ex.Message);
return null;
}
}
然后访问所需的属性。
https://stackoverflow.com/questions/56549128
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