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Created attachment 6202 [details]
When the iOS device is in the German Region, DataContractJsonSerializer.ReadObject returns an invalid double result.
The attached test project shows a value of "1234" on the screen, but it should read the double value from the json string as "12,34". This works as expected in Xamarin.iOS 7.0.6.
Not working in
Version: 188.8.131.52 (Business Edition)
Build date: 2014-17-02 17:43:23-0500
There not a big delta  between 7.0.6 and 7.0.7 - but there's a change wrt DataContractJsonSerializer, it was the fix for #16744 .
The diff for 21cb413 looks globalization safe - but the readon of Single/Double/Decimal were replaceed by code that might not be.
@John is that code yours ? or the customer ?
If so I'll convert it into a unit test and commit it along the fix (in the mono repo).
The fix itself is rather simple:
diff --git a/mcs/class/System.ServiceModel.Web/System.Runtime.Serialization.Json/JsonSerializationReader.cs b/mcs/class/System.ServiceModel.Web/System.Runtime.Serialization.Json/JsonSerializationReader.cs
index 1ca5792..29e3cfa 100644
@@ -189,7 +189,7 @@ namespace System.Runtime.Serialization.Json
object ReadValueType (Type type, bool nullable)
string s = reader.ReadElementContentAsString ();
- return nullable && s.Trim ().Length == 0 ? null : Convert.ChangeType (s, type, null);
+ return nullable && s.Trim ().Length == 0 ? null : Convert.ChangeType (s, type, CultureInfo.InvariantCulture);
@John, let me know if I can reuse the sample (otherwise I'll create a unit test from scratch) and commit everything.
I created my own test.
Fixed in mono/master 56d406876f3455a13db8f71418d1cbf256889975