/// <summary> Protected parameterless constructor engineering unit base constructor </summary>
protected NotifyUnit()
{
_systemValue = 0;
_userValue = 0;
_systemUnitType = AutoUnitsConfig.GetSystemUnit(this);
_userUnitType = AutoUnitsConfig.GetUserUnit(this);
Converter = AutoUnitsConfig.GetConversions(this);
}
/// <summary> Protected engineering unit base constructor </summary>
/// <param name="systemValue">Initial system value</param>
/// <param name="systemUnitType">Initial system unit type</param>
/// <param name="converter">Converter</param>
protected NotifyUnit(double systemValue, string systemUnitType, ConversionBase converter)
{
_systemValue = systemValue;
_systemUnitType = systemUnitType;
_userValue = systemValue;
_userUnitType = systemUnitType;
Converter = converter;
}
/// <summary>
/// Attempts to transform a string containing binary, octal, decimal, hexadecimal or base64 values into a byte array.
/// </summary>
/// <param name="source">The string to transform.</param>
/// <param name="conversionBase">The numeric base the string values represents.</param>
/// <param name="convertedByteArray">A byte array containing the byte values in the <paramref name="source"/> string.</param>
/// <param name="exception">The <see cref="Exception"/> generated if this function returns <b>false</b>.</param>
/// <returns>Whether the conversion was successful or not. <b>True</b> indicates successful conversion, <b>false</b> indicates a failure and the <paramref name="exception"/> will contain the error generated.</returns>
public static bool TryConvertStringToByteArray(string source,
ConversionBase conversionBase,
out byte[] convertedByteArray,
out Exception exception)
{
try
{
convertedByteArray = ConvertStringToByteArray(source, conversionBase);
exception = null;
return(true);
}
catch (Exception ex)
{
convertedByteArray = new byte[0];
exception = ex;
return(false);
}
}
// ----------------
/// <summary>
/// Will transform a byte array into a string containing either binary, octal, decimal, hexadecimal or base64 values.
/// </summary>
/// <param name="source">The byte array to transform.</param>
/// <param name="conversionBase">The numeric base to convert the byte array values into.</param>
/// <param name="byteInterstitialSpacing">The string which will be inserted between each byte value.</param>
/// <returns>A string containing either binary, octal, decimal, hexadecimal or base64 values of the bytes in the <paramref name="source"/> byte array.</returns>
/// <remarks>
/// For example:
/// <code>
/// Source Value (byte[]) = 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0F
///
/// Returned Value (binary) = "00000000 00000001 00000010 00000011 00000100 00000101 00000110 00000111 00001000 00001001 00001010 00001011 00001100 00001101 00001110 00001111"
/// Returned Value (octal) = "000 001 002 003 004 005 006 007 010 011 012 013 014 015 016 017"
/// Returned Value (decimal) = "000 001 002 003 004 005 006 007 008 009 010 011 012 013 014 015"
/// Returned Value (hexadecimal) = "00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F"
/// Returned Value (base64) = "AAECAwQFBgcICQoLDA0ODw=="
/// </code>
/// </remarks>
public static string ConvertByteArrayToString(byte[] source,
ConversionBase conversionBase,
string byteInterstitialSpacing = null)
{
// convert Base64
if (conversionBase == ConversionBase.Base64)
{
return(Convert.ToBase64String(source));
}
else
{
// fix the interstitial characters
if (byteInterstitialSpacing == null)
{
byteInterstitialSpacing = "";
}
// get the string width of each byte representation
var width = 2;
switch (conversionBase)
{
case ConversionBase.Binary:
width = 8;
break;
case ConversionBase.Octal:
width = 3;
break;
case ConversionBase.Decimal:
width = 3;
break;
case ConversionBase.Hexadecimal:
width = 2;
break;
default:
break;
}
// convert each byte into the desired base value, padded with leading zeros to the proper string width and separate each one with the interstitial characters
return(string.Join(byteInterstitialSpacing,
source.Select(x => Convert.ToString(x, (int)conversionBase).ToUpper().PadLeft(width, '0'))));
}
}
/// <summary>
/// Attempts to transform a byte array into a string containing either binary, octal, decimal, hexadecimal or base64 values.
/// </summary>
/// <param name="source">The byte array to transform.</param>
/// <param name="conversionBase">The numeric base to convert the byte array values into.</param>
/// <param name="convertedString">The string containing the byte values in the <paramref name="source"/> byte array.</param>
/// <param name="exception">The <see cref="Exception"/> generated if this function returns <b>false</b>.</param>
/// <param name="byteInterstitialSpacing">The string which will be inserted between each byte value.</param>
/// <returns>Whether the conversion was successful or not. <b>True</b> indicates successful conversion, <b>false</b> indicates a failure and the <paramref name="exception"/> will contain the error generated.</returns>
public static bool TryConvertByteArrayToString(byte[] source,
ConversionBase conversionBase,
out string convertedString,
out Exception exception,
string byteInterstitialSpacing = null)
{
try
{
convertedString = ConvertByteArrayToString(source, conversionBase, byteInterstitialSpacing);
exception = null;
return(true);
}
catch (Exception ex)
{
convertedString = "";
exception = ex;
return(false);
}
}
// GET api/values/5
public decimal?GetConvertedRate(decimal amount, string fromCurrency, string toCurrency)
{
WebClient web = new WebClient();
//below link was working before but somehow later it was blocked.
//However it does work from within browser.
//string url = string.Format("https://www.google.com/finance/converter?a={0}&from={1}&to={2}", amount, fromCurrency.ToUpper(), toCurrency.ToUpper());
//now using below only available free(without any conditions of use) api on internet.
string url = string.Format("https://api.fixer.io/latest?base={0}", fromCurrency.ToUpper());
try
{
string response = web.DownloadString(url);
JavaScriptSerializer oJS = new JavaScriptSerializer();
ConversionBase objConversionBase = new ConversionBase();
//first deserializing the response by using dynamic type
var dict = oJS.Deserialize <dynamic>(response);
//getting the same into a strong typed object
objConversionBase.Base = dict["base"];
objConversionBase.Date = Convert.ToDateTime(dict["date"]);
objConversionBase.Rates = new Dictionary <string, decimal>();
foreach (var item in dict["rates"])
{
objConversionBase.Rates.Add(item.Key, item.Value); //item.Key, item.Value);
}
//getting the target rate from the list of converstion rates for the base(fromCurrency) currency.
KeyValuePair <string, decimal> currentTargetRate =
objConversionBase.Rates.Where(kv => kv.Key == toCurrency.ToUpper()).FirstOrDefault();
decimal?rate = amount * currentTargetRate.Value;
return(rate);
}
catch (Exception)
{
return(null);
}
//final conversion
}
protected override void CopySourceDataToDestination(ConversionBase <Database> .ConversionHandler conversionHandler)
{
throw new NotImplementedException();
}
protected override void ConvertSourceDatabaseToDestination(ConversionBase <Database> .ConversionHandler conversionHandler, ConversionBase <Database> .TableSelectionHandler tableSelectionHandler, ConversionBase <Database> .FailedViewDefinitionHandler failedViewDefinitionHandler, bool createTriggers)
{
throw new NotImplementedException();
}
/// <summary>
/// Will transform a string containing binary, octal, decimal, hexadecimal or base64 values into a byte array.
/// </summary>
/// <param name="source">The string to transform.</param>
/// <param name="conversionBase">The numeric base the string values represents.</param>
/// <returns>A byte array containing the byte values in the string.</returns>
/// <remarks>
/// This method assumes that the string provided is made up of sets of numeric representations of either binary, octal, decimal, hexadecimal or base64 values.
/// <para/><para/>
/// For example:
/// <code>
/// Source Value (binary) = "00000000 00000001 00000010 00000011 00000100 00000101 00000110 00000111 00001000 00001001 00001010 00001011 00001100 00001101 00001110 00001111"
/// Source Value (octal) = "000 001 002 003 004 005 006 007 010 011 012 013 014 015 016 017"
/// Source Value (decimal) = "000 001 002 003 004 005 006 007 008 009 010 011 012 013 014 015"
/// Source Value (hexadecimal) = "00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F"
/// Source Value (base64) = "AAECAwQFBgcICQoLDA0ODw=="
///
/// Returned Value (byte[]) = 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0F
/// </code>
/// </remarks>
public static byte[] ConvertStringToByteArray(string source,
ConversionBase conversionBase)
{
if (string.IsNullOrWhiteSpace(source))
{
// return empty byte array if source is null or empty
return(new byte[0]);
}
// convert Base64
if (conversionBase == ConversionBase.Base64)
{
return(Convert.FromBase64String(source));
}
else
{
// get the string width of each byte representation and get a set of valid characters
var width = 2;
var validCharacters = "";
switch (conversionBase)
{
case ConversionBase.Binary:
width = 8;
validCharacters = "01";
break;
case ConversionBase.Octal:
width = 3;
validCharacters = "01234567";
break;
case ConversionBase.Decimal:
width = 3;
validCharacters = "0123456789";
break;
case ConversionBase.Hexadecimal:
width = 2;
validCharacters = "0123456789abcdefABCDEF";
break;
default:
break;
}
// remove all non-valid characters
var sourceHold = new StringBuilder(source.Length);
for (int i = 0; i < source.Length; i++)
{
if (validCharacters.Contains(source[i]))
{
sourceHold.Append(source[i]);
}
}
var source2 = sourceHold.ToString();
// check
if (!string.IsNullOrWhiteSpace(source2))
{
if ((source2.Length % width) == 0)
{
// process string: convert to byte array
return(Enumerable.Range(0, int.MaxValue / width) // iterate the maximum length of a string divided by (width) (because there are (width) characters for each byte segment)
.Select(i => i * width) // get the starting index for each the char segment (step by (width) characters each time)
.TakeWhile(i => i < source2.Length) // only work the length of the source string
.Select(i => source2.Substring(i, width)) // get the binary string segments (take the next (width) characters)
.Select(s => Convert.ToByte(s, (int)conversionBase)) // convert to byte (convert the (width) characters into a byte)
.ToArray()); // put it all into a byte array (put the byte into an array) }
}
else
{
throw new InvalidOperationException($"Input string length is invalid. Length={source.Length:N0}. Must be divisible by {width}. (not counting invalid characters, which are ignored)");
}
}
else
{
throw new InvalidOperationException($"Input string is invalid. Must contain fixed-sized blocks of the following characters: \"{validCharacters}\"; Character Block Size={width}");
}
}
}
