Parameter 'table_name' not found in the collection. C#中调用MySQL存储过程出错解决方案

Parameter 'table_name' not found in the collection. C#中调用MySQL存储过程出错

C# code

 string connStr = String.Format("server=127.0.0.1;user id=root; database=test; pooling=false;port=3306");            MySqlConnection myConn = new MySqlConnection(connStr);            myConn.Open();            MySqlCommand cmd = new MySqlCommand();            cmd.Connection = myConn;            cmd.CommandType = CommandType.StoredProcedure;            cmd.CommandText = "pre_name";            MySqlParameter ind = new MySqlParameter("?index_name", MySqlDbType.Int16, 15);            ind.Value=1;            cmd.Parameters.Add(ind);            MySqlParameter id = new MySqlParameter("?",MySqlDbType.VarChar,40);            id.Direction = ParameterDirection.Output;            cmd.Parameters.Add(id);            cmd.ExecuteNonQuery();            textBox4.Text = id.Value.ToString();            myConn.Close();