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using System;
using System.Collections;
using System.Text;
using System.Windows.Forms;
namespace NotUsedFinder
{
/// <summary>
/// This class is an implementation of the 'IComparer' interface.
/// </summary>
public class ColumnSorter : IComparer
{
/// <summary>
/// Specifies the column to be sorted
/// </summary>
private int ColumnToSort;
/// <summary>
/// Specifies the order in which to sort (i.e. 'Ascending').
/// </summary>
private SortOrder OrderOfSort;
/// <summary>
/// Case insensitive comparer object
/// </summary>
private CaseInsensitiveComparer ObjectCompare;
/// <summary>
/// Class constructor. Initializes various elements
/// </summary>
public ColumnSorter()
{
// Initialize the column to '0'
ColumnToSort = 0;
// Initialize the sort order to 'none'
OrderOfSort = SortOrder.None;
// Initialize the CaseInsensitiveComparer object
ObjectCompare = new CaseInsensitiveComparer();
}
/// <summary>
/// This method is inherited from the IComparer interface. It compares the two objects passed using a case insensitive comparison.
/// </summary>
/// <param name="x">First object to be compared</param>
/// <param name="y">Second object to be compared</param>
/// <returns>The result of the comparison. "0" if equal, negative if 'x' is less than 'y' and positive if 'x' is greater than 'y'</returns>
public int Compare(object x, object y)
{
int compareResult;
ListViewItem listviewX, listviewY;
// Cast the objects to be compared to ListViewItem objects
listviewX = (ListViewItem)x;
listviewY = (ListViewItem)y;
// Compare the two items
compareResult = ObjectCompare.Compare(listviewX.SubItems[ColumnToSort].Text, listviewY.SubItems[ColumnToSort].Text);
// Calculate correct return value based on object comparison
if (OrderOfSort == SortOrder.Ascending)
{
// Ascending sort is selected, return normal result of compare operation
return compareResult;
}
else if (OrderOfSort == SortOrder.Descending)
{
// Descending sort is selected, return negative result of compare operation
return (-compareResult);
}
else
{
// Return '0' to indicate they are equal
return 0;
}
}
/// <summary>
/// Gets or sets the number of the column to which to apply the sorting operation (Defaults to '0').
/// </summary>
public int SortColumn
{
set
{
ColumnToSort = value;
}
get
{
return ColumnToSort;
}
}
/// <summary>
/// Gets or sets the order of sorting to apply (for example, 'Ascending' or 'Descending').
/// </summary>
public SortOrder Order
{
set
{
OrderOfSort = value;
}
get
{
return OrderOfSort;
}
}
}
}
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I have been a professional developer since 1996. My experience comes from many different industries; Data Mining Software, Consulting, E-Commerce, Wholesale Operations, Clinical Software, Insurance, Energy.
I started programming in the military, trying to find better ways to analyze database data, eventually automating my entire job. Later, in college, I automated my way out of another job. This gave me the great idea to switch majors to the only thing that seemed natural…Programming!