Added default currency sign #45 #46

src/NodaMoney/Currency.cs

@@ -23,9 +23,7 @@ public struct Currency : IEquatable<Currency>
     {
         internal static readonly CurrencyRegistry Registry = new CurrencyRegistry();
 
-        /// <summary>
-        /// Initializes a new instance of the <see cref="Currency" /> struct.
-        /// </summary>
+        /// <summary>Initializes a new instance of the <see cref="Currency" /> struct.</summary>
         /// <param name="code">The code.</param>
         /// <param name="number">The number.</param>
         /// <param name="decimalDigits">The decimal digits.</param>
@@ -66,6 +64,10 @@ internal Currency(string code, string number, double decimalDigits, string engli
         /// <value>The Currency that represents the country/region used by the current thread.</value>
         public static Currency CurrentCurrency => FromRegion(RegionInfo.CurrentRegion);
 
+        /// <summary>Gets the currency sign (¤), a character used to denote an unspecified currency.</summary>
+        /// <remarks><seealso cref="https://en.wikipedia.org/wiki/Currency_sign_(typography)"/></remarks>
+        public static string CurrencySign => CultureInfo.InvariantCulture.NumberFormat.CurrencySymbol;
+
         /// <summary>Gets the currency symbol.</summary>
         public string Symbol { get; private set; }
 

src/NodaMoney/CurrencyBuilder.cs

@@ -83,8 +83,10 @@ public static Currency Unregister(string code, string @namespace)
         //// <exception cref="InvalidOperationException">The current CurrencyBuilder object has a property that must be set before the currency can be registered.</exception>
         public Currency Build()
         {
-            // TODO: Add validation?
             // throw new InvalidOperationException("The current CurrencyBuilder object has a property that must be set before the currency can be registered.");
+            if (string.IsNullOrWhiteSpace(Symbol))
+                Symbol = Currency.CurrencySign;
+
             var currency = new Currency(Code, ISONumber, DecimalDigits, EnglishName, Symbol, Namespace, ValidTo, ValidFrom);
 
             return currency;