SortedSet <T> Class

等於只有TKey的SortedDictionary<TKey, TValue>.

Example

using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;


class Program
{
static void Main(string[] args)
{
try
{
// Get a list of the files to use for the sorted set.
IEnumerable<string> files1 =
Directory.EnumerateFiles(@"\\archives\2007\media",
"*", SearchOption.AllDirectories);

// Create a sorted set using the ByFileExtension comparer.
SortedSet<string> mediaFiles1 =
new SortedSet<string>(new ByFileExtension());

// Note that there is a SortedSet constructor that takes an IEnumerable,
// but to remove the path information they must be added individually.
foreach (string f in files1)
{
mediaFiles1.Add(f.Substring(f.LastIndexOf(@"\") + 1));
}

// Remove elements that have non-media extensions.
// See the 'isDoc' method.
Console.WriteLine("Remove docs from the set...");
Console.WriteLine("\tCount before: {0}", mediaFiles1.Count.ToString());
mediaFiles1.RemoveWhere(isDoc);
Console.WriteLine("\tCount after: {0}", mediaFiles1.Count.ToString());


Console.WriteLine();

// List all the avi files.
SortedSet<string> aviFiles = mediaFiles1.GetViewBetween("avi", "avj");

Console.WriteLine("AVI files:");
foreach (string avi in aviFiles)
{
Console.WriteLine("\t{0}", avi);
}

Console.WriteLine();

// Create another sorted set.
IEnumerable<string> files2 =
Directory.EnumerateFiles(@"\\archives\2008\media",
"*", SearchOption.AllDirectories);

SortedSet<string> mediaFiles2 = new SortedSet<string>(new ByFileExtension());

foreach (string f in files2)
{
mediaFiles2.Add(f.Substring(f.LastIndexOf(@"\") + 1));
}

// Remove elements in mediaFiles1 that are also in mediaFiles2.
Console.WriteLine("Remove duplicates (of mediaFiles2) from the set...");
Console.WriteLine("\tCount before: {0}", mediaFiles1.Count.ToString());
mediaFiles1.ExceptWith(mediaFiles2);
Console.WriteLine("\tCount after: {0}", mediaFiles1.Count.ToString());

Console.WriteLine();

Console.WriteLine("List of mediaFiles1:");
foreach (string f in mediaFiles1)
{
Console.WriteLine("\t{0}",f);
}

// Create a set of the sets.
IEqualityComparer<SortedSet<string>> comparer =
SortedSet<string>.CreateSetComparer();

HashSet<SortedSet<string>> allMedia =
new HashSet<SortedSet<string>>(comparer);
allMedia.Add(mediaFiles1);
allMedia.Add(mediaFiles2);
}
catch(IOException ioEx)
{
Console.WriteLine(ioEx.Message);
}

catch (UnauthorizedAccessException AuthEx)
{
Console.WriteLine(AuthEx.Message);

}
}

// Defines a predicate delegate to use
// for the SortedSet.RemoveWhere method.
private static bool isDoc(string s)
{
if (s.ToLower().EndsWith(".txt") ||
s.ToLower().EndsWith(".doc") ||
s.ToLower().EndsWith(".xls") ||
s.ToLower().EndsWith(".xlsx") ||
s.ToLower().EndsWith(".pdf") ||
s.ToLower().EndsWith(".doc") ||
s.ToLower().EndsWith(".docx"))
{
return true;
}
else
{
return false;
}
}


}

// Defines a comparer to create a sorted set
// that is sorted by the file extensions.
public class ByFileExtension : IComparer<string>
{
string xExt, yExt;

CaseInsensitiveComparer caseiComp = new CaseInsensitiveComparer();

public int Compare(string x, string y)
{
// Parse the extension from the file name. 
xExt = x.Substring(x.LastIndexOf(".") + 1);
yExt = y.Substring(y.LastIndexOf(".") + 1);

// Compare the file extensions. 
int vExt = caseiComp.Compare(xExt, yExt);
if (vExt != 0)
{
return vExt;
}
else
{
// The extension is the same, 
// so compare the filenames. 
return caseiComp.Compare(x, y);
}
}
}