C# - FONCTION PERMETTANT D'OBTENIR L'ENCODAGE D'UN FICHIER TEXTE

using System.Text;
using System.IO;

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/// <summary>
/// Permet de tester l'encodage utilisé pour le fichier texte dont le chemin est fourni
/// </summary>
/// <param name="CheminFichier">Chemin du fichier</param>
/// <returns>Encodage du fichier Texte</returns>
private Encoding ObtientENcoding(string CheminFichier)
{
	Encoding enc = null;
	FileStream file = new FileStream(CheminFichier, FileMode.Open, FileAccess.Read, FileShare.Read
	if (file.CanSeek)
	{
		byte[] bom = new byte[4]; // Get the byte-order mark, if there is one
		file.Read(bom, 0, 4);
		if (bom[0] == 0xef && bom[1] == 0xbb && bom[2] == 0xbf) // utf-8
		{
			enc = Encoding.UTF8;
		}
		else if ((bom[0] == 0xff && bom[1] == 0xfe) || // ucs-2le, ucs-4le, and ucs-16le
			(bom[0] == 0 && bom[1] == 0 && bom[2] == 0xfe && bom[3] == 0xff)) // ucs-4
		{
			enc = Encoding.Unicode;
		}
		else if (bom[0] == 0xfe && bom[1] == 0xff) // utf-16 and ucs-2
		{
			enc = Encoding.BigEndianUnicode;
		}
		else // ANSI, Default
		{
			enc = Encoding.Default;
		}
		// Now reposition the file cursor back to the start of the file
		file.Seek(0, SeekOrigin.Begin);
	}
	else
	{
		// The file cannot be randomly accessed, so you need to decide what to set the default to
		// based on the data provided. If you're expecting data from a lot of older applications,
		// default your encoding to Encoding.ASCII. If you're expecting data from a lot of newer
		// applications, default your encoding to Encoding.Unicode. Also, since binary files are
		// single byte-based, so you will want to use Encoding.ASCII, even though you'll probably
		// never need to use the encoding then since the Encoding classes are really meant to get
		// strings from the byte array that is the file.

		enc = Encoding.Default;
	}
return enc;
}

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