Bug 18830 - Double.Parse FormatException in german locale
Summary: Double.Parse FormatException in german locale
Alias: None
Product: Class Libraries
Classification: Mono
Component: mscorlib ()
Version: 3.2.x
Hardware: Other Linux
: --- normal
Target Milestone: Untriaged
Assignee: Marek Safar
Depends on:
Reported: 2014-04-06 04:00 UTC by sw
Modified: 2014-04-07 11:56 UTC (History)
3 users (show)

Is this bug a regression?: ---
Last known good build:

a little testcase (5.50 KB, application/octet-stream)
2014-04-06 04:00 UTC, sw

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Description sw 2014-04-06 04:00:37 UTC
Created attachment 6505 [details]
a little testcase

I have a raspberry pi (os: raspbian) with system language set to "de_DE.UTF-8" and mono version 3.28 installed. My programs need to convert Strings into Doubles, but I ran into a few problems:

Double.Parse("500", NumberStyles.Float, CultureInfo.InvariantCulture);

Works just fine.

Double.Parse("500.123", NumberStyles.Float, CultureInfo.InvariantCulture);

Throws FormatException, what is weird.

Double.Parse("500,123", NumberStyles.Float, CultureInfo.GetCultureInfo("de-DE"));

Throws FormatException too;

The funny thing is if I change my system language (raspi-config and reboot after that) to "en-GB.UTF-8" all functions work as expected. As a German user I would like to use German system settings.

I looked into the source of Double.cs ( https://github.com/mono/mono/blob/master/mcs/class/corlib/System/Double.cs ). I think that line 533 to 537 are doing this:
if (!ParseImpl (p, out retVal)) {
  if (!tryParse)
    exc = Int32.GetFormatException ();
  return false;
But I can´t find the code for ParseImpl it is some a extern function.

I added a testcase as attachment

mono --version:
Mono JIT compiler version 3.2.8 (Debian 3.2.8+dfsg-4+rpi1)
Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com
	TLS:           __thread
	SIGSEGV:       normal
	Notifications: epoll
	Architecture:  armel,vfp+hard
	Disabled:      none
	Misc:          softdebug 
	LLVM:          supported, not enabled.
	GC:            sgen
Comment 1 Marek Safar 2014-04-07 11:56:09 UTC
Already fixed in mono 3.4