[C#] CONVERSION DE CHAÎNE 'STRING' VERS CHAÎNE 'DÉCIMAL' ET RÉCIPROQUEMENT

/// <summary>
		/// Convert a string like 'abcdefghijklmnopqrstuvwxyz' to decimal string like '6162636465666768696A6B6C6D6E6F707172737475767778797A'
		/// ONLY UNICODE IN THIS FUNCTION
		/// </summary>
		/// <param name="_szStr">String to convert</param>
		/// <returns></returns>
		public string ConvertUnicodeStringToHexaString (string _szStr)
		{
			string szResult		= String.Empty;
			byte[] abytesText	= Encoding.Unicode.GetBytes(_szStr);

			foreach (byte a in abytesText)
			{
				if (a<16)
					szResult += "0" + a.ToString ("X");
				else
					szResult += a.ToString ("X");
			}
			return szResult;
		}

		/// <summary>
		/// Convert a string like '6162636465666768696A6B6C6D6E6F707172737475767778797A' to decimal string like 'abcdefghijklmnopqrstuvwxyz'
		/// ONLY UNICODE IN THIS FUNCTION
		/// </summary>
		/// <param name="_szStr">String to convert</param>
		/// <returns></returns>
		public string ConvertHexaStringToUnicodeString (string _szStr)
		{
			int		iOffset		= 0;
			string	szResult	= String.Empty;
			byte[]	abytesText	= new byte [_szStr.Length /2];

			for (int i = 0; i < _szStr.Length /2; i++)
			{
				abytesText [iOffset] = (byte)Int32.Parse(_szStr.Substring(i*2,2), System.Globalization.NumberStyles.HexNumber);
				iOffset++;
			}

			char[] asciiChars = new char[Encoding.Unicode.GetCharCount(abytesText, 0, abytesText.Length)];
			Encoding.Unicode.GetChars(abytesText, 0, abytesText.Length, asciiChars, 0);
			szResult = new string(asciiChars);

			return szResult;
		}

		/// <summary>
		/// Convert a string like 'abcdefghijklmnopqrstuvwxyz' to decimal string like '6162636465666768696A6B6C6D6E6F707172737475767778797A'
		/// ONLY ASCII IN THIS FUNCTION
		/// </summary>
		/// <param name="_szStr">String to convert</param>
		/// <returns></returns>
		public string ConvertAsciiStringToHexaString (string _szStr)
		{
			string szResult		= String.Empty;
			byte[] abytesText	= Encoding.ASCII.GetBytes(_szStr);

			foreach (byte a in abytesText)
			{
				if (a<16)
					szResult += "0" + a.ToString ("X");
				else
					szResult += a.ToString ("X");
			}
			return szResult;
		}

		/// <summary>
		/// Convert a string like '6162636465666768696A6B6C6D6E6F707172737475767778797A' to decimal string like 'abcdefghijklmnopqrstuvwxyz'
		/// ONLY ASCII IN THIS FUNCTION
		/// </summary>
		/// <param name="_szStr">String to convert</param>
		/// <returns></returns>
		public string ConvertHexaStringToAsciiString (string _szStr)
		{
			int		iOffset		= 0;
			string	szResult	= String.Empty;
			byte[]	abytesText	= new byte [_szStr.Length /2];

			for (int i = 0; i < _szStr.Length /2; i++)
			{
				abytesText [iOffset] = (byte)Int32.Parse(_szStr.Substring(i*2,2), System.Globalization.NumberStyles.HexNumber);
				iOffset++;
			}

			char[] asciiChars = new char[Encoding.ASCII.GetCharCount(abytesText, 0, abytesText.Length)];
			Encoding.ASCII.GetChars(abytesText, 0, abytesText.Length, asciiChars, 0);
				
			szResult = new string(asciiChars);
			return szResult;
		}