3 Digit currency code to currency symbol

While a bit brute-force and not particularly elegant, you could do it like this:

public bool TryGetCurrencySymbol(string ISOCurrencySymbol, out string symbol)
{
    symbol = CultureInfo
        .GetCultures(CultureTypes.AllCultures)
        .Where(c => !c.IsNeutralCulture)
        .Select(culture => {
            try{
                return new RegionInfo(culture.Name);
            }
            catch
            {
                return null;
            }
        })
        .Where(ri => ri!=null && ri.ISOCurrencySymbol == ISOCurrencySymbol)
        .Select(ri => ri.CurrencySymbol)
        .FirstOrDefault();
    return symbol != null;
}

and use it as follows:

string currSymbol;
if(TryGetCurrencySymbol("GBP",out currSymbol))
{
    Console.WriteLine("symbol is {0}", currSymbol);
}

If you anticipate hammering this method, perhaps it's better to build a cache up front:

public static class CurrencyTools
{
    private static IDictionary<string,string> map;
    static CurrencyTools()
    {
        map = CultureInfo
            .GetCultures(CultureTypes.AllCultures)
            .Where(c => !c.IsNeutralCulture)
            .Select(culture => {
                try{
                    return new RegionInfo(culture.Name);
                }
                catch
                {
                    return null;
                }
            })
            .Where(ri => ri!=null)
            .GroupBy(ri => ri.ISOCurrencySymbol)
            .ToDictionary(x => x.Key, x => x.First().CurrencySymbol);
    }
    public static bool TryGetCurrencySymbol(
                          string ISOCurrencySymbol, 
                          out string symbol)
    {
        return map.TryGetValue(ISOCurrencySymbol,out symbol);
    }
}

At the time of writing, on my machine etc. etc. the map contains the following mappings:

AED  د.إ.‏
AFN  ؋
ALL  Lekë
AMD  ֏
ANG  NAf.
AOA  Kz
ARS  $
AUD  $
AWG  Afl.
AZN  ₼
BAM  КМ
BBD  $
BDT  ৳
BGN  лв.
BHD  د.ب.‏
BIF  FBu
BMD  $
BND  $
BOB  Bs
BRL  R$
BSD  $
BTN  Nu.
BWP  P
BYN  Br
BZD  $
CAD  $
CDF  FC
CHF  CHF
CLP  $
CNY  ¥
COP  $
CRC  ₡
CUP  $
CVE  
CZK  Kč
DJF  Fdj
DKK  kr.
DOP  $
DZD  د.ج.‏
EGP  ج.م.‏
ERN  Nfk
ETB  Br
EUR  €
FJD  $
FKP  £
GBP  £
GEL  ₾
GHS  GH₵
GIP  £
GMD  D
GNF  FG
GTQ  Q
GYD  $
HKD  $
HNL  L
HRK  kn
HTG  G
HUF  Ft
IDR  Rp
ILS  ₪
INR  ₹
IQD  د.ع.‏
IRR  ريال
ISK  kr
JMD  $
JOD  د.ا.‏
JPY  ¥
KES  Ksh
KGS  сом
KHR  ៛
KMF  CF
KPW  ₩
KRW  ₩
KWD  د.ك.‏
KYD  $
KZT  ₸
LAK  ₭
LBP  ل.ل.‏
LKR  රු.
LRD  $
LYD  د.ل.‏
MAD  د.م.‏
MDL  L
MGA  Ar
MKD  ден
MMK  K
MNT  ₮
MOP  MOP$
MRU  MRU
MUR  Rs
MVR  ރ.
MWK  MK
MXN  $
MYR  RM
MZN  MTn
NAD  $
NGN  ₦
NIO  C$
NOK  kr
NPR  रु
NZD  $
OMR  ر.ع.‏
PAB  B/.
PEN  S/
PGK  K
PHP  ₱
PKR  Rs
PLN  zł
PYG  ₲
QAR  ر.ق.‏
RON  lei
RSD  дин.
RUB  ₽
RWF  RF
SAR  ر.س.‏
SBD  $
SCR  SR
SDG  ج.س.
SEK  kr
SGD  $
SHP  £
SLL  Le
SOS  S
SRD  $
SSP  £
STN  Db
SYP  ل.س.‏
SZL  E
THB  ฿
TJS  смн
TMT  m.
TND  د.ت.‏
TOP  T$
TRY  ₺
TTD  $
TWD  NT$
TZS  TSh
UAH  ₴
UGX  USh
USD  $
UYU  $
UZS  сўм
VES  Bs.S
VND  ₫
VUV  VT
WST  WS$
XAF  FCFA
XCD  EC$
XDR  XDR
XOF  CFA
XPF  FCFP
YER  ر.ي.‏
ZAR  R
ZMW  K

.NET has CultureInfo.NumberFormat.CurrencySymbol

CultureInfo us = new CultureInfo("en-US");
CultureInfo gb = new CultureInfo("en-GB");
CultureInfo fr = new CultureInfo("fr-FR");

Console.Out.WriteLine(us.NumberFormat.CurrencySymbol); // $
Console.Out.WriteLine(gb.NumberFormat.CurrencySymbol); // £
Console.Out.WriteLine(fr.NumberFormat.CurrencySymbol); // €

But this requires the culture name, not "GBP". As far as I know its not possible directly from "GBP", etc.

The same information is also available via RegionInfo, along with the currency code:

RegionInfo us = new RegionInfo("en-US");
RegionInfo gb = new RegionInfo("en-GB");
RegionInfo fr = new RegionInfo("fr-FR");

Console.Out.WriteLine(us.CurrencySymbol); // $
Console.Out.WriteLine(gb.CurrencySymbol); // £
Console.Out.WriteLine(fr.CurrencySymbol); // €

Console.Out.WriteLine(us.ISOCurrencySymbol); // USD
Console.Out.WriteLine(gb.ISOCurrencySymbol); // GBP
Console.Out.WriteLine(fr.ISOCurrencySymbol); // EUR

I suppose one could conceivably use that to construct a map from ISO code to symbol.

The list of culture names is avaliable here.

EDIT: Well this seems to work:

public static class CurrencyCodeMapper
{
    private static readonly Dictionary<string, string> SymbolsByCode;

    public static string GetSymbol(string code) { return SymbolsByCode[code]; }

    static CurrencyCodeMapper()
    {
        SymbolsByCode = new Dictionary<string, string>();

        var regions = CultureInfo.GetCultures(CultureTypes.SpecificCultures)
                      .Select(x => new RegionInfo(x.LCID));

        foreach (var region in regions)
            if (!SymbolsByCode.ContainsKey(region.ISOCurrencySymbol))
                SymbolsByCode.Add(region.ISOCurrencySymbol, region.CurrencySymbol);
    }
}

Usage:

CurrencyCodeMapper.GetSymbol("USD") // $
CurrencyCodeMapper.GetSymbol("GBP") // £
CurrencyCodeMapper.GetSymbol("EUR") // €

Note, of course, that this does not produce a comprehensive list. In particular, it does not include old Eurozone currencies that have been superseded by the Euro. I cannot see any way around this but to manually add such currencies if you need them, for example SymbolsByCode.Add("FRF", "₣"); for French Francs.

3 Digit currency code to currency symbol

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