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string m_strConnectionString = "Data Source=" + AppDomain.CurrentDomain.SetupInformation.ApplicationBase + @"stations.dat";
SQLiteConnection conn = new SQLiteConnection(m_strConnectionString);
conn.Open();
string sql = "select * from citys";
SQLiteCommand cmd = new SQLiteCommand(sql,conn);
cmd.ExecuteReader();
SQLiteDataReader sda = cmd.ExecuteReader();//这里报错DataReader already active on this command
while(sda.Read())
{
sda["name"].ToString();
}