/// <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;
// Cast the objects to be compared to ListViewItem objects
var listviewX = (ListViewItem)x;
var listviewY = (ListViewItem)y;
if (SortColumn == 0)
{
compareResult = FirstObjectCompare.Compare(x, y);
}
else
{
compareResult =
ObjectCompare.Compare(listviewX?.SubItems[SortColumn].Text,
listviewY?.SubItems[SortColumn].Text);
}
switch (Order)
{
// Calculate correct return value based on object comparison
case SortOrder.Ascending:
return(compareResult);
case SortOrder.Descending:
return(-compareResult);
default:
// Return '0' to indicate they are equal
return(0);
}
}
} /// <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;
if (ColumnToSort == 0)
{
compareResult = FirstObjectCompare.Compare(x, y);
}
else
{
// 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);
}
}