Sql Server CLR SqlFunction FillRowMethod throwing error on "void" in declaration

Question

The error you're seeing is Expected class, delegate, enum, interface or struct.

This indicates the function declaration for ladder_FillRow is not contained inside a class. You need to move the function inside the Ladder class like:

using System.Collections.Generic;
using System.Collections;
using System.Data.SqlTypes;
using System.Data.SqlClient;
using Microsoft.SqlServer.Server;
using System;
using System.Data;

namespace AFLFootballCLR
{
    public partial class LadderUserDefinedFunctions
    {
        private class Ladder
        {
            public SqlInt32 Id;
            public SqlInt32 TeamId;
            public SqlInt32 Played;
            public SqlInt32 Won;
            public SqlInt32 Draw;
            public SqlInt32 Lost;
            public SqlInt32 PtsFor;
            public SqlInt32 PtsAgainst;
            public SqlInt32 Pts;

            public Ladder(SqlInt32 id, SqlInt32 teamId, SqlInt32 played, SqlInt32 won, SqlInt32 draw, SqlInt32 lost, SqlInt32 ptsFor, SqlInt32 ptsAgainst, SqlInt32 pts)
            {
                this.Id = id;
                this.TeamId = teamId;
                this.Played = played;
                this.Won = won;
                this.Draw = draw;
                this.Lost = lost;
                this.PtsFor = ptsFor;
                this.PtsAgainst = ptsAgainst;
                this.Pts = pts;
            }

        }


        [SqlFunction(DataAccess = DataAccessKind.Read, FillRowMethodName = "Ladder_FillRow", TableDefinition = "Id int, TeamId int, Played int, Won int, Draw int, Lost int, PtsFor int, PtsAgainst int, Pts int")]
        public static IEnumerable GetLadder(SqlInt32 s)
        {

            //int season = s;
            int iplayed = 0;
            int iwon = 0;
            int idraw = 0;
            int ilost = 0;
            int iforPts = 0;
            int iagainstPts = 0;
            int ipts = 0;
            int tempId = 0;
            Dictionary<int, string> withTeam = new Dictionary<int, string>();
            string connectionString = "Data Source=EAGLE;Initial Catalog=AFLFooty;Persist Security Info=True;User ID=sa;Password=Colinmck0708";
            using (var connection = new SqlConnection(connectionString))
            {
                connection.Open();
                using (var teamsFromDb = new SqlCommand("Select Id, TeamName From Teams", connection))
                {
                    using (var teamReader = teamsFromDb.ExecuteReader())
                    {
                        while (teamReader.Read())
                        {
                            int teamId = teamReader.GetInt32(0);
                            string teamName = teamReader.GetString(1);
                            withTeam.Add(teamId, teamName);
                        }
                        teamReader.Close();
                        foreach (KeyValuePair<int, string> kvp in withTeam)
                        {
                            int TeamId = kvp.Key;
                            string teamName = kvp.Value;
                            if (teamName != "Bye")
                            {
                                using (var resultsFromDb = new SqlCommand("SELECT QtrByQtrs.Fixture_ID, QtrByQtrs.HPoints, QtrByQtrs.APoints, Fixtures.HomeID, Fixtures.AwayID FROM QtrByQtrs INNER JOIN Fixtures ON QtrByQtrs.Fixture_ID = Fixtures.ID WHERE ((Fixtures.HomeID = " + TeamId + ") AND (QtrByQtrs.Qtr = 4) AND (Fixtures.SeasonID = @s)) OR ((Fixtures.AwayID = " + TeamId + ") AND (QtrByQtrs.Qtr = 4) AND (Fixtures.SeasonID = @s))", connection))
                                {
                                    using (var resultsReader = resultsFromDb.ExecuteReader())
                                    {
                                        while (resultsReader.Read())
                                        {
                                            if (resultsReader.GetInt32(3) == TeamId)
                                            {
                                                if (!(Convert.IsDBNull(resultsReader.GetInt32(1))) & !(Convert.IsDBNull(resultsReader.GetInt32(2))))
                                                {
                                                    iplayed += 1;
                                                    if (resultsReader.GetInt32(1) > resultsReader.GetInt32(2))
                                                    {
                                                        iwon += 1;
                                                        ipts += 4;
                                                    }
                                                    else if (resultsReader.GetInt32(1) < resultsReader.GetInt32(2))
                                                    {
                                                        ilost += 1;
                                                    }
                                                    else
                                                    {
                                                        idraw += 1;
                                                        ipts += 2;
                                                    }
                                                    iforPts += resultsReader.GetInt32(1);
                                                    iagainstPts += resultsReader.GetInt32(2);
                                                }
                                            }
                                            else
                                            {
                                                if (!(Convert.IsDBNull(resultsReader.GetInt32(1))) & !(Convert.IsDBNull(resultsReader.GetInt32(2))))
                                                {
                                                    iplayed += 1;
                                                    if (resultsReader.GetInt32(1) < resultsReader.GetInt32(2))
                                                    {
                                                        iwon += 1;
                                                        ipts += 4;
                                                    }
                                                    else if (resultsReader.GetInt32(1) > resultsReader.GetInt32(2))
                                                    {
                                                        ilost += 1;
                                                    }
                                                    else
                                                    {
                                                        idraw += 1;
                                                        ipts += 2;
                                                    }
                                                    iforPts += resultsReader.GetInt32(2);
                                                    iagainstPts += resultsReader.GetInt32(1);
                                                }
                                            }
                                        }

                                        resultsReader.Close();
                                    }
                                }
                            }
                            if (teamName != "Bye")
                            {
                                yield return new Ladder(id: tempId, teamId: TeamId, played: iplayed, won: iwon, draw: idraw, lost: ilost, ptsFor: iforPts, ptsAgainst: iagainstPts, pts: ipts);
                                tempId += 1;
                            }
                            iplayed = 0;
                            iwon = 0;
                            idraw = 0;
                            ilost = 0;
                            iforPts = 0;
                            iagainstPts = 0;
                            ipts = 0;

                        }
                    }
                }
            }
        }



        public static void Ladder_FillRow(object ladderObj, out SqlInt32 id, out SqlInt32 teamId, out SqlInt32 played, out SqlInt32 won, out SqlInt32 draw, out SqlInt32 lost, out SqlInt32 ptsFor, out SqlInt32 ptsAgainst, out SqlInt32 pts)
        {
            var l = (Ladder)ladderObj;

            id = l.Id;
            teamId = l.TeamId;
            played = l.Played;
            won = l.Won;
            draw = l.Draw;
            lost = l.Lost;
            ptsFor = l.PtsFor;
            ptsAgainst = l.PtsAgainst;
            pts = l.Pts;

        }
    }
};