WPF-Less GDI+.NET Report Component: Star Report

using System;
using System.Collections.ObjectModel;
using System.Windows.Forms;

namespace UniverseReport
{
	/// <summary>
	/// A collection for the Numbers object
	/// </summary>
	/// 
    [Serializable()]
	internal class NumberCollection:Collection<Number>
	{
		public NumberCollection()
		{
	
		}

        /// <summary>
        ///Get the sum of all numbers in this collection
        /// </summary>
        /// <returns>sum or -1 if there are no numbers</returns>
		public double GetSum()
		{
			double total=0.0;

            foreach (Number number in this)
            {
                //MessageBox.Show("getting: "+ number.Data.ToString());
                total += number.Data;
                //MessageBox.Show("Total: " + total.ToString());

            }
           // MessageBox.Show("Returning: " + Math.Round(total,2).ToString());
			return Math.Round(total,2); 
		}

        /// <summary>
        ///Get the average of all numbers in this collection
        /// </summary>
        /// <returns>average or -1 if there are no number</returns>
		public double GetAverage()
		{
            if (this.Count > 0)
                return GetSum() / this.Count;
            else
                return -1;

            
		}

        /// <summary>
        ///Get the maximum number in this collection
        /// </summary>
        /// <returns>maximum or -1 if there are no number</returns>
		public double GetMaximum()
		{
            if (this.Count > 0)
            {
                double max = this[0].Data;

                foreach (Number number in this)
                {
                    if (number.Data > max)
                        max = number.Data;
                }

                return max;
            }
            else
                return -1;
		}

		public int GetCount()
		{
			return this.Count;
		}

        /// <summary>
        ///Get the minimum number in this collection
        /// </summary>
        /// <returns>minimum or -1 if there are no number</returns>
		public double GetMinimum()
		{
            if (this.Count > 0)
            {
                double min = this[0].Data;

                foreach (Number number in this)
                {
                    if (number.Data < min)
                        min = number.Data;
                }

                return min;
            }
            else
                return -1;
		}
	}
}