public int Compare(object x, object y)
{
// Cast the objects to be compared to ListViewItem objects
ListViewItem listviewX = (ListViewItem)x;
ListViewItem listviewY = (ListViewItem)y;
if (listviewX.Checked && !listviewY.Checked)
{
return(-1);
}
else if (listviewX.Checked.Equals(listviewY.Checked))
{
if (listviewX.ImageIndex < listviewY.ImageIndex)
{
return(-1);
}
else if (listviewX.ImageIndex == listviewY.ImageIndex)
{
return(objectCompare.Compare(listviewX.Text.Trim(), listviewY.Text.Trim()));
}
else
{
return(1);
}
}
else
{
return(1);
}
}
public int Compare(object x, object y)
{
int image1, image2;
ListViewItem listviewX, listviewY;
// Cast the objects to be compared to ListViewItem objects
listviewX = (ListViewItem)x;
image1 = listviewX.ImageIndex;
listviewY = (ListViewItem)y;
image2 = listviewY.ImageIndex;
if (image1 < image2)
{
return(-1);
}
else if (image1 == image2)
{
return(objectCompare.Compare(listviewX.Text.Trim(), listviewY.Text.Trim()));
}
else
{
return(1);
}
}
/// <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 = 0;
ListViewItem listviewX, listviewY;
// Cast the objects to be compared to ListViewItem objects
listviewX = (ListViewItem)x;
listviewY = (ListViewItem)y;
ListView listViewMain = listviewX.ListView;
// Calculate correct return value based on object comparison
if (listViewMain.Sorting != SortOrder.Ascending &&
listViewMain.Sorting != SortOrder.Descending)
{
// Return '0' to indicate they are equal
return(compareResult);
}
if (SortModifier.Equals(SortModifiers.SortByText) || SortColumn > 0)
{
// Compare the two items
if (listviewX.SubItems.Count <= SortColumn &&
listviewY.SubItems.Count <= SortColumn)
{
compareResult = objectCompare.Compare(null, null);
}
else if (listviewX.SubItems.Count <= SortColumn &&
listviewY.SubItems.Count > SortColumn)
{
compareResult = objectCompare.Compare(null, listviewY.SubItems[SortColumn].Text.Trim());
}
else if (listviewX.SubItems.Count > SortColumn && listviewY.SubItems.Count <= SortColumn)
{
compareResult = objectCompare.Compare(listviewX.SubItems[SortColumn].Text.Trim(), null);
}
else
{
compareResult = objectCompare.Compare(listviewX.SubItems[SortColumn].Text.Trim(), listviewY.SubItems[SortColumn].Text.Trim());
}
}
else
{
switch (SortModifier)
{
case SortModifiers.SortByCheckbox:
compareResult = firstObjectCompare2.Compare(x, y);
break;
case SortModifiers.SortByImage:
compareResult = firstObjectCompare.Compare(x, y);
break;
default:
compareResult = firstObjectCompare.Compare(x, y);
break;
}
}
// Calculate correct return value based on object comparison
if (Order == SortOrder.Ascending)
{
// Ascending sort is selected, return normal result of compare operation
return(compareResult);
}
else if (Order == SortOrder.Descending)
{
// Descending sort is selected, return negative result of compare operation
return(-compareResult);
}
else
{
// Return '0' to indicate they are equal
return(0);
}
}
