[Conditional Formatter] Use invariant decimal parsing (#456)

* Added test to ensure that Choose decimal parsing uses invariant culture.

* Use invariant culture when parsing the choose decimal.

src/SmartFormat.Tests/Extensions/ConditionalFormatterTests.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Globalization;
 using NUnit.Framework;
 using SmartFormat.Core.Formatting;
 using SmartFormat.Extensions;
@@ -159,4 +160,27 @@ public void Should_Process_Signed_And_Unsigned_Numbers()
             Assert.That(smart.Format("{0:cond:=123?yes|no}", number), Is.EqualTo("yes"));
         }
     }
+
+    [TestCase("en")]
+    [TestCase("fr")]
+    [TestCase("nb-NO")]
+    public void Test_DecimalParsingUses_InvariantCulture(string culture)
+    {
+        const string format = "{0:cond:<=0.25?I am less than 0.25|I am over 0.25}";
+        const string expected = "I am over 0.25";
+
+        var currentCulture = CultureInfo.CurrentCulture;
+        var cultureInfo = CultureInfo.CreateSpecificCulture(culture);
+        CultureInfo.CurrentCulture = cultureInfo;
+
+        try
+        {
+            var smart = Smart.CreateDefaultSmartFormat();
+            smart.Test(format, new object[] { 0.3 }, expected);
+        }
+        finally
+        {
+            CultureInfo.CurrentCulture = currentCulture;
+        }
+    }
 }

src/SmartFormat/Extensions/ConditionalFormatter.cs

@@ -4,6 +4,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Globalization;
 using System.Text.RegularExpressions;
 using SmartFormat.Core.Extensions;
 using SmartFormat.Core.Parsing;
@@ -199,7 +200,7 @@ private static bool TryEvaluateCondition(Format parameter, decimal value, out bo
 
         for (var i = 0; i < andOrs.Count; i++)
         {
-            var v = decimal.Parse(values[i].Value);
+            var v = decimal.Parse(values[i].Value, CultureInfo.InvariantCulture);
             var exp = false;
             switch (comps[i].Value)
             {