/// <summary>
/// Compares two <see cref="IShellItem" />s. The comparison is carried
/// out by display order.
/// </summary>
/// <param name="item">
/// The item to compare.
/// </param>
/// <returns>
/// 0 if the two items are equal. A negative number if
/// <see langword="this" /> is before <paramref name="item" /> in
/// display order. A positive number if
/// <see langword="this" /> comes after <paramref name="item" /> in
/// display order.
/// </returns>
public int Compare(ShellItem item)
{
var result = ComInterface.Compare(item.ComInterface,
SICHINT.DISPLAY);
return(result);
}
/// <summary>
/// Determines whether two <see cref="ShellItem" />s refer to
/// the same shell folder.
/// </summary>
/// <param name="obj">
/// The item to compare.
/// </param>
/// <returns>
/// <see langword="true" /> if the two objects refer to the same
/// folder, <see langword="false" /> otherwise.
/// </returns>
public override bool Equals(object obj)
{
if (obj is ShellItem)
{
var otherItem = (ShellItem)obj;
var result = ComInterface.Compare(otherItem.ComInterface,
SICHINT.DISPLAY) == 0;
// Sometimes, folders are reported as being unequal even when
// they refer to the same folder, so double check by comparing
// the file system paths. (This was showing up on Windows XP in
// the SpecialFolders() test)
if (!result)
{
result = IsFileSystem && otherItem.IsFileSystem &&
(FileSystemPath == otherItem.FileSystemPath);
}
return(result);
}
return(false);
}