{"some_key" : ""}Which is handled properly as an empty value by Python and Javascript alike, barfs inside the stronger-typed C#, when you try to serialize it to a "long" value (for example), throwing the following exception on both .NET and Mono
Unhandled Exception: System.Exception: is not a valid value for Int64. ---> System.FormatException: Input string was not in the correct format: s.Length==0. at System.Int64.Parse (System.String s, NumberStyles style, IFormatProvider fp) [0x00000] at System.ComponentModel.Int64Converter.ConvertFromString (System.String value, System.Globalization.NumberFormatInfo format) [0x00000] at System.ComponentModel.BaseNumberConverter.ConvertFrom (ITypeDescriptorContext context, System.Globalization.CultureInfo culture, System.Object value) [0x00000]
[full stack trace from attached test code at the bottom of this email]Ideally this would just *not* be serialized out, leaving the object's property that maps to "some_key" empty/uninitialized, but instead the application that consumes and deserializes the JSON will explode, especially if the JSON provider (Facebook in my case) provides fields such as this as optional.
As I mentioned to sontek in the IRC channel, it certainly seems like I'm screwed in this case, since we are "compatible" with Microsoft's bugs :( So the bigger question is, what work around or recourse do I have in this case? I have kicked around the idea of adding a Mono.Script.Serialization to trunk that would essentially just apply a series of patches to System.Web.Script.Serialization, but I'd rather avoid that route as it doesn't tend to grow well, but I don't see a really decent workaround except to implement a "magic" property for EVERY single optional JSON key (which in some calls can be up to about 50 keys) to do a Convert.ToInt64 if there's a string on get {}, otherwise return a null (this sucks, and I don't want to implement it for every frakking deserializable attribute that could need to be deserialized as anything but a string)
I've attached my test case, but I have a sense someone is going to point out that the emperor has no clothes, and that I am indeed screwed :-P
Cheers
JsonTest.cs
Description: Binary data
Unhandled Exception: System.Exception: is not a valid value for Int64. ---> System.FormatException: Input string was not in the correct format: s.Length==0. at System.Int64.Parse (System.String s, NumberStyles style, IFormatProvider fp) [0x00000] at System.ComponentModel.Int64Converter.ConvertFromString (System.String value, System.Globalization.NumberFormatInfo format) [0x00000] at System.ComponentModel.BaseNumberConverter.ConvertFrom (ITypeDescriptorContext context, System.Globalization.CultureInfo culture, System.Object value) [0x00000]
--- End of inner exception stack trace ---at System.ComponentModel.BaseNumberConverter.ConvertFrom (ITypeDescriptorContext context, System.Globalization.CultureInfo culture, System.Object value) [0x00000] at System.ComponentModel.TypeConverter.ConvertFromString (ITypeDescriptorContext context, System.Globalization.CultureInfo culture, System.String text) [0x00000] at System.ComponentModel.TypeConverter.ConvertFromInvariantString (ITypeDescriptorContext context, System.String text) [0x00000] at System.ComponentModel.TypeConverter.ConvertFromInvariantString (System.String text) [0x00000] at System.Web.Script.Serialization.JavaScriptSerializer.ConvertToType (System.Type type, System.Object obj) [0x00000] at System.Web.Script.Serialization.JavaScriptSerializer.ConvertToObject (IDictionary`2 dict, System.Type type) [0x00000] at System.Web.Script.Serialization.JavaScriptSerializer.ConvertToType (System.Type type, System.Object obj) [0x00000] at System.Web.Script.Serialization.JavaScriptSerializer.ConvertToType [JsonObject] (System.Object obj) [0x00000] at System.Web.Script.Serialization.JavaScriptSerializer.Deserialize [JsonObject] (System.String input) [0x00000]
at JsonTests.JsonTest.Main (System.String[] args) [0x00000]
PGP.sig
Description: This is a digitally signed message part
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