public int Compare(object x, object y)
{
int compareResult = 0;
ListViewItem listviewX, listviewY;
listviewX = (ListViewItem)x;
listviewY = (ListViewItem)y;
ListView listViewMain = listviewX.ListView;
if (listViewMain.Sorting != SortOrder.Ascending &&
listViewMain.Sorting != SortOrder.Descending)
{
return(compareResult);
}
if (mySortModifier.Equals(SortModifiers.SortByText) || ColumnToSort > 0)
{
if (listviewX.SubItems.Count <= ColumnToSort &&
listviewY.SubItems.Count <= ColumnToSort)
{
compareResult = ObjectCompare.Compare(null, null);
}
else if (listviewX.SubItems.Count <= ColumnToSort &&
listviewY.SubItems.Count > ColumnToSort)
{
compareResult = ObjectCompare.Compare(null, listviewY.SubItems[ColumnToSort].Text.Trim());
}
else if (listviewX.SubItems.Count > ColumnToSort && listviewY.SubItems.Count <= ColumnToSort)
{
compareResult = ObjectCompare.Compare(listviewX.SubItems[ColumnToSort].Text.Trim(), null);
}
else
{
compareResult = ObjectCompare.Compare(listviewX.SubItems[ColumnToSort].Text.Trim(), listviewY.SubItems[ColumnToSort].Text.Trim());
}
}
else
{
switch (mySortModifier)
{
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;
}
}
if (OrderOfSort == SortOrder.Ascending)
{
return(compareResult);
}
else if (OrderOfSort == SortOrder.Descending)
{
return(-compareResult);
}
else
{
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 = 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 (mySortModifier.Equals(SortModifiers.SortByText) || ColumnToSort > 0)
{
// Compare the two items
if (listviewX.SubItems.Count <= ColumnToSort &&
listviewY.SubItems.Count <= ColumnToSort)
{
compareResult = ObjectCompare.Compare(null, null);
}
else if (listviewX.SubItems.Count <= ColumnToSort &&
listviewY.SubItems.Count > ColumnToSort)
{
compareResult = ObjectCompare.Compare(null, listviewY.SubItems[ColumnToSort].Text.Trim());
}
else if (listviewX.SubItems.Count > ColumnToSort && listviewY.SubItems.Count <= ColumnToSort)
{
compareResult = ObjectCompare.Compare(listviewX.SubItems[ColumnToSort].Text.Trim(), null);
}
else
{
compareResult = ObjectCompare.Compare(listviewX.SubItems[ColumnToSort].Text.Trim(), listviewY.SubItems[ColumnToSort].Text.Trim());
}
}
else
{
switch (mySortModifier)
{
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 (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>
/// This method comes right from IEnumerable. It compares two items.
/// </summary>
/// <param name="x">First item</param>
/// <param name="y">Second item</param>
#pragma warning disable 1570
/// <returns>Result of the comparison. 0 if equal, 1 if x > y, -1 if x < y</returns>
#pragma warning restore 1570
public int Compare(object x, object y)
{
var compareResult = 0;
var listviewX = (ListViewItem)x;
var listviewY = (ListViewItem)y;
var listViewMain = listviewX.ListView;
if (listViewMain.Sorting != SortOrder.Ascending &&
listViewMain.Sorting != SortOrder.Descending)
{
return(compareResult);
}
if (mySortModifier.Equals(SortModifiers.SortByText))
{
if (listviewX.SubItems.Count <= ColumnToSort &&
listviewY.SubItems.Count <= ColumnToSort)
{
compareResult = ObjectCompare.Compare(null, null);
}
else if (listviewX.SubItems.Count <= ColumnToSort &&
listviewY.SubItems.Count > ColumnToSort)
{
compareResult = ObjectCompare.Compare(null, listviewY.SubItems[ColumnToSort].Text.Trim());
}
else if (listviewX.SubItems.Count > ColumnToSort && listviewY.SubItems.Count <= ColumnToSort)
{
compareResult = ObjectCompare.Compare(listviewX.SubItems[ColumnToSort].Text.Trim(), null);
}
else
{
compareResult = ObjectCompare.Compare(listviewX.SubItems[ColumnToSort].Text.Trim(),
listviewY.SubItems[ColumnToSort].Text.Trim());
}
}
else if (mySortModifier.Equals(SortModifiers.SortByDate))
{
// Parse the two objects passed as a parameter as a DateTime.
var firstDate =
DateTime.ParseExact(((ListViewItem)x).SubItems[ColumnToSort].Text, "dd/MM/yyyy",
CultureInfo.InvariantCulture);
var secondDate =
DateTime.ParseExact(((ListViewItem)y).SubItems[ColumnToSort].Text, "dd/MM/yyyy",
CultureInfo.InvariantCulture);
// Compare the two dates.
var returnVal = DateTime.Compare(firstDate, secondDate);
if (OrderOfSort == SortOrder.Descending)
{
returnVal *= -1;
}
return(returnVal);
}
else if (mySortModifier.Equals(SortModifiers.SortByDecimal))
{
// Parse the two objects passed as a parameter as a decimal.
Console.WriteLine(((ListViewItem)x).SubItems[ColumnToSort].Text);
var firstNum =
decimal.Parse(Regex.Match(((ListViewItem)x).SubItems[ColumnToSort].Text, @"^-?\d+(?:\.\d+)?").Value);
var secondNum =
decimal.Parse(Regex.Match(((ListViewItem)y).SubItems[ColumnToSort].Text, @"^-?\d+(?:\.\d+)?").Value);
// Compare the two dates.
var returnVal = firstNum > secondNum ? 1 : -1;
if (OrderOfSort == SortOrder.Descending)
{
returnVal *= -1;
}
return(returnVal);
}
else
{
switch (mySortModifier)
{
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;
}
}
if (OrderOfSort == SortOrder.Ascending)
{
return(compareResult);
}
else if (OrderOfSort == SortOrder.Descending)
{
return(-compareResult);
}
else
{
return(0);
}
}
