string DB_PATH = "Data Source=F:/sqlitedb/test.db; Password=123";

        private void add_Click(object sender, RoutedEventArgs e)
        {    
            using (SQLiteConnection con = new SQLiteConnection(DB_PATH))
            {
                con.Open();
                string sqlStr = @"INSERT INTO hero
                                  VALUES
                                  (
                                      3,
                                      '测试有效'
                                  )";
                using (SQLiteCommand cmd = new SQLiteCommand(sqlStr, con))
                {
                    cmd.ExecuteNonQuery();
                }
            }
        }