Why Newtonsoft.Json.Linq.Item behaves weird - json

Question

Just look at this one line code
jobject.parse("{""volume"": 5074364.34541878}").item("volume").tostring
The result is 5074364,34541878
That is with . instead of comma. How can that be? This has caused lots of bugs.
The value of
Threading.Thread.CurrentThread.CurrentUICulture.NumberFormat.CurrencyDecimalSeparator
is "."
Recently I found something weird in my computer.
For some reasons many dots becomes comma. For some reasons, some program like firefox think that the decimal separator is comma instead of dot.
That is even though my international settings is set to US (I am actually in Indonesia).
Then the program I created (that should have been independent of this) start behaving erratically.
For example, look at this code
Dim valueInString = grabform.Item(frontstr).ToString
The value of grabform.toString is
{
"key": "tTRXUSD",
"bid": 0.060322,
"ask": 0.060323,
"last": 0.060289,
"volume": 5074364.34541878,
"high": 0.061143,
"low": 0.060192,
"base123": "USD",
"quote123": "TRX"
}
The type of grabform is JObject
in this function
Private Shared Function grabValueOfActualQuote(grabform As JObject, frontstr As String) As Decimal
Dim valueInString = grabform.Item(frontstr).ToString
If valueInString = "" Then
Return 0D
End If
If valueInString.Length > 15 Then
Dim b = 1
End If
Dim left1 = Strings.Left(valueInString, 20)
Dim output = Decimal.Parse(left1, System.Globalization.NumberStyles.Any)
Return output
End Function
Now the result of valueInstring is 5074364,34541878 (notice the comma)
How can that be?
The value of
It seems that somehow there is a hidden settings in my computer that makes my computer think that the decimal mark is comma instead of dot. Obviously my program should have used dot irrelevant of computer settings. Not to mention I know where the setting is.
Newtonsoft.Json.Linq. shouldn't change behavior no matter what international setting is.
What should I do?

Answer 1

Look at this piece of code:
using System.Globalization;
var xyz = 5074364.34541878;
Console.WriteLine($"Current culture: {CultureInfo.CurrentCulture.Name}");
Console.WriteLine(xyz);
// https://stackoverflow.com/a/5263650/724039
Thread.CurrentThread.CurrentUICulture = new CultureInfo("en-US");
Thread.CurrentThread.CurrentCulture = Thread.CurrentThread.CurrentUICulture;
Thread.CurrentThread.CurrentUICulture.NumberFormat.CurrencyGroupSeparator = "A";
Thread.CurrentThread.CurrentUICulture.NumberFormat.CurrencyDecimalSeparator = "B";
Thread.CurrentThread.CurrentUICulture.NumberFormat.NumberDecimalSeparator = "C";
Thread.CurrentThread.CurrentUICulture.NumberFormat.NumberGroupSeparator = "D";
Console.WriteLine(xyz.GetType().ToString());
Console.WriteLine(xyz);
Console.WriteLine("Change NumberDecimalSeparator to '.'");
Thread.CurrentThread.CurrentUICulture.NumberFormat.NumberDecimalSeparator = ".";
Console.WriteLine(xyz);
It's output is:
Current culture: nl-NL
5074364,34541878
System.Double
5074364C34541878
Change NumberDecimalSeparator to '.'
5074364.34541878
Conclusion: The value that you read from JSON is a System.Double, and C# applies the NumberDecimalSeparator when using this variable.