System.Xml.XmlReaderBinarySupport.GetBase64Byte C# (CSharp) Méthode

		private byte GetBase64Byte (char ch)
		{
			switch (ch) {
			case '+':
				return 62;
			case '/':
				return 63;
			default:
				if (ch >= 'A' && ch <= 'Z')
					return (byte) (ch - 'A');
				else if (ch >= 'a' && ch <= 'z')
					return (byte) (ch - 'a' + 26);
				else if (ch >= '0' && ch <= '9')
					return (byte) (ch - '0' + 52);
				else
					throw new XmlException ("Invalid Base64 character was found.");
			}
		}