129 lines
3.8 KiB
C#
129 lines
3.8 KiB
C#
using System.Collections;
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using System.Windows.Forms;
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/// <summary>
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/// This class is an implementation of the 'IComparer' interface.
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/// </summary>
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public class ListViewColumnSorter : IComparer
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{
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/// <summary>
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/// Specifies the column to be sorted
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/// </summary>
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private int ColumnToSort;
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/// <summary>
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/// Specifies the order in which to sort (i.e. 'Ascending').
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/// </summary>
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private SortOrder OrderOfSort;
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/// <summary>
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/// Case insensitive comparer object
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/// </summary>
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private CaseInsensitiveComparer ObjectCompare;
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/// <summary>
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/// Class constructor. Initializes various elements
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/// </summary>
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public ListViewColumnSorter()
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{
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// Initialize the column to '0'
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ColumnToSort = 0;
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// Initialize the sort order to 'none'
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OrderOfSort = SortOrder.Ascending;
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// Initialize the CaseInsensitiveComparer object
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ObjectCompare = new CaseInsensitiveComparer();
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}
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/// <summary>
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/// This method is inherited from the IComparer interface. It compares the two objects passed using a case insensitive comparison.
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/// </summary>
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/// <param name="x">First object to be compared</param>
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/// <param name="y">Second object to be compared</param>
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/// <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>
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public int Compare(object x, object y)
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{
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int compareResult;
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ListViewItem listviewX, listviewY;
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// Cast the objects to be compared to ListViewItem objects
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listviewX = (ListViewItem)x;
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listviewY = (ListViewItem)y;
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if (ColumnToSort == 5 ) {
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try
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{
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int yNum = int.Parse(cleanNumber(listviewY.SubItems[ColumnToSort].Text));
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int xNum = int.Parse(cleanNumber(listviewX.SubItems[ColumnToSort].Text));
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if (xNum == yNum )
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{
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return 0;
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}
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else if(xNum > yNum && OrderOfSort == SortOrder.Descending)
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{
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return -1;
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}
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else
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{
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return 1;
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}
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} catch { }
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}
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// Compare the two items
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compareResult = ObjectCompare.Compare(listviewX.SubItems[ColumnToSort].Text, listviewY.SubItems[ColumnToSort].Text);
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// Calculate correct return value based on object comparison
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if (OrderOfSort == SortOrder.Ascending)
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{
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// Ascending sort is selected, return normal result of compare operation
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return compareResult;
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}
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else if (OrderOfSort == SortOrder.Descending)
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{
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// Descending sort is selected, return negative result of compare operation
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return (-compareResult);
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}
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else
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{
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// Return '0' to indicate they are equal
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return 0;
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}
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}
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/// <summary>
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/// Gets or sets the number of the column to which to apply the sorting operation (Defaults to '0').
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/// </summary>
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public int SortColumn
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{
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set
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{
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ColumnToSort = value;
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}
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get
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{
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return ColumnToSort;
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}
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}
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/// <summary>
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/// Gets or sets the order of sorting to apply (for example, 'Ascending' or 'Descending').
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/// </summary>
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public SortOrder Order
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{
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set
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{
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OrderOfSort = value;
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}
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get
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{
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return OrderOfSort;
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}
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}
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private string cleanNumber(string number)
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{
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return number.Substring(0, number.LastIndexOf('.'));
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}
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} |