适配器未使用SQLite C加载任何内容#

这是我的密码

 string dbfile = new System.IO.FileInfo(System.Reflection.Assembly.GetExecutingAssembly().Location).DirectoryName + "\\m23.db";

        string sql;

        DateTime dt = DateTime.Now;
        SQLiteConnection connection = new SQLiteConnection("datasource="+ dbfile);

        SQLiteDataAdapter adapter = new SQLiteDataAdapter("select * from p_posts", connection);
        DataSet data = new DataSet();
        adapter.Fill(data); //  <<< here i get the error

        SQLiteCommand cmd = new SQLiteCommand();
        cmd.CommandType = CommandType.TableDirect;
        cmd.Connection = connection;

        connection.Open();