/// <summary>
/// Get Parent Id which is always the first part
/// minus last (child) id in the sequence.
/// </summary>
/// <returns>ParentId or null if the id list
/// contains only 1 or less items (parent is unknown).</returns>
public IdList GetParentId()
{
if (Size <= 1)
{
return(null);
}
IdList parentList = null;
var parent = new List <ShellId>();
for (int i = 0; i < Ids.Count - 1; i++)
{
parent.Add(ShellId.FromData(Ids[i].RawId));
}
parentList = IdList.Create(parent);
return(parentList);
}
/// <summary>
/// Creates an idlist from parsing string format.
/// </summary>
/// <param name="str">The string.</param>
/// <returns>The idlist represented by the string.</returns>
public static IdList FromParsingString(string str)
{
// Create the id storage.
var idList = new List <ShellId>();
// Repeatedly read a short length then the data.
int index = 0;
while (index < str.Length)
{
var length = Convert.ToInt16(str.Substring(index, 4), 16);
var id = new byte[length];
index += 4;
for (var i = 0; i < length; i++, index += 2)
{
id[i] = Convert.ToByte(str.Substring(index, 2), 16);
}
idList.Add(ShellId.FromData(id));
}
// Return the list.
return(new IdList(idList));
}