SBO | Funkcje 3 C#

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

[Serializable]
[SqlUserDefinedAggregate(Format.Native)]
public struct GEOAVE
{
    private int licznik;  // field to count the not null rows
    private double iloczyn;
    private double temp;
    public void Init()
    {
        licznik = 0;
        iloczyn = 1;// initialization
    }
    public void Accumulate(double? Value)
    {
        if (Value != null)  // count just the rows that are not equal to NULL
        {
            licznik++;
            iloczyn = iloczyn * (double)Value;
        }
    }
    public void Merge(GEOAVE Group)
    {
        this.licznik += Group.licznik;
        this.iloczyn *= Group.iloczyn; // when merge is needed the counter of other groups should be added
    }

    public double? Terminate() //SqlString
    {
        //return new SqlString(Counter.ToString());
        temp = 1.0 / licznik;
        iloczyn = Math.Pow(iloczyn, temp);
        return (double?)this.iloczyn;//returning the results
    }
}

[Serializable]
[SqlUserDefinedAggregate(Format.UserDefined, MaxByteSize = 8000)]
public struct LiczZnaki : IBinarySerialize
{
    private int? licznik;  // field to count the not null rows
    private int licz;
    public void Init()
    {
        licz = 0;
        licznik = 0;
    }
    public void Accumulate(SqlString Value)
    {
        if (!Value.IsNull)  // count just the rows that are not equal to NULL
        {
            licz++;
            licznik = licznik + Value.ToString().Length;
        }
    }
    public void Merge(LiczZnaki Group)
    {
        this.licznik += Group.licznik;
        this.licz += Group.licz;
    }

    public int? Terminate() //SqlString
    {
        if (licz != 0) return this.licznik;//returning the results
        else return null;
    }

    public void Read(BinaryReader r)
    {
        licz = r.ReadInt32();
        licznik = r.ReadInt32();
    }

    public void Write(BinaryWriter w)
    {
        w.Write(licz);
        w.Write((int)licznik);

    }
}


[Serializable]
[SqlUserDefinedAggregate(Format.UserDefined, MaxByteSize = -1)]
public struct LaczZnaki : IBinarySerialize
{
    private string slowo;  // field to count the not null rows
    private int licz;
    public void Init()
    {
        licz = 0;
        slowo = "";
    }
    public void Accumulate(SqlString Value)
    {
        if (!Value.IsNull)  // count just the rows that are not equal to NULL
        {
            licz++;
            slowo = slowo + Value.ToString() + ", ";
        }
    }
    public void Merge(LaczZnaki Group)
    {
        this.slowo += Group.slowo;
        this.licz += Group.licz;
    }

    public string Terminate() //SqlString
    {
        if (licz != 0) return this.slowo.Substring(0, slowo.Length-2) ;//returning the results
        else return null;
    }

    public void Read(BinaryReader r)
    {
        licz = r.ReadInt32();
        slowo = r.ReadString();
    }

    public void Write(BinaryWriter w)
    {
        w.Write(licz);
        w.Write(slowo);

    }
}