Sort an array in C#

Question

Given the following Datatype

public class FileDefinition
{
    public String headercode;
    public String text;
    public String fileext;
    public int readNumBytes;

    public FileDefinition(String headercode, String fileext, String text, int readNumBytes)
    {
        this.headercode = headercode;
        this.fileext = fileext;
        this.text = text;
        this.readNumBytes = readNumBytes;
    }
}

I have something like this:

    knownfiles[90] = new FileDefinition(
        "^2E524543",
        "ivr",
        "RealPlayer video file (V11 and later)",
        DEFAULT_READ_BYTES
    );

        knownfiles[89] = new FileDefinition(
            "^.{2,4}2D6C68",
            "lha",
            "Compressed archive file",
            DEFAULT_READ_BYTES
        );

        knownfiles[88] = new FileDefinition(
            "^2A2A2A2020496E7374616C6C6174696F6E205374617274656420",
            "log",
            "Symantec Wise Installer log file",
            DEFAULT_READ_BYTES
        );

Question: How do i sort by the "headercode" field?

FileDefinition[] filedefs = clsFiledefs.getFileDefinitions();
FileDefinition[] filedefs2 = SOMEMAGIC(filedefs);

I need it to get my array ordered by the longest field to the shortest.

I have tried to Array.Sort(X,y), but that did not work. Thanks in advance for all answers.

The title said "multidimensional" but the arrays are just one-dimensional. I changed that. — tobsen, Aug 04 '13 at 11:37

score 3 · Accepted Answer · answered Aug 04 '13 at 11:52

3

Use the following:

Array.Sort( filedefs, ( a, b ) => a.headercode.Length.CompareTo( b.headercode.Length ) );

if you don't want to alter the original array then

FileDefinition[] filedefs2 = (FileDefinition[])filedefs.Clone();
Array.Sort( filedefs2, ( a, b ) => a.headercode.Length.CompareTo( b.headercode.Length ) );

answered Aug 04 '13 at 11:52

Panos Theof

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Nice, but now i have the shortest first. How can i order it DESC, so the longest length is first? – Paladin Aug 04 '13 at 11:54
Array copying is not good. In second solution it's better to use LINQ's OrderBy. – Display Name Aug 04 '13 at 11:59
1

What do you mean is not good? It's much faster than the LINQ's OrderBy + ToArray – Panos Theof Aug 04 '13 at 12:04

Ehsan · Answer 2 · 2013-08-04T12:05:41.137

You can do this

var sorted = filedefs.OrderBy(x=> x.headercode, StringComparer.InvariantCultureIgnoreCase).ToArray();
var sorted = filedefs.OrderByDescending(x=> x.headercode, StringComparer.InvariantCultureIgnoreCase).ToArray();

if you want to order by their length

var sorted = filedefs.OrderBy(x=> x.headercode.Length).ToArray();
var sorted = filedefs.OrderByDescending(x=> x.headercode.Length).ToArray();

score 0 · Answer 3 · edited Apr 15 '14 at 05:37

0

You should use a List<FileDefinition> (Because it's a lot easier to add items into a List as into an array) and than just use the Linq expression OrderBy to order your list.

knownfiles.OrderBy(s => s.readNumBytes);

edited Apr 15 '14 at 05:37

nbanic

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answered Aug 04 '13 at 11:36

Venson

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It should work with Array.Sort as well. See http://stackoverflow.com/questions/5430016/better-way-to-sort-array-in-descending-order – tobsen Aug 04 '13 at 11:40

Sort an array in C#

3 Answers3