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See this for SO
This is a program that is ready to run in Xamarin and VS2013.
I'm having an issue where mono isn't calling the serializer Subclass<T>, and need to work around that issue.
**Bug / workaround needed**
How should I modify SetMembershipProof so that it will call a method with the attribute [OnSerializing] located in a nested subclass of <T>?
static void Main(string args)
SetMembershipProof2 setMembershipProof = new SetMembershipProof2();
string setProofJSON = CryptoSerializer.Serialize<SetMembershipProof2>(setMembershipProof);
// Inspect the contents of SetProofJSON, it is null under mono, and not null in .NET
public class CryptoSerializer
/// Serialize serializable types in namespace UProveCrypto.PolyProof.
/// <typeparam name="T">input type</typeparam>
/// <param name="obj">instance of serializable type</param>
/// <returns>JSON string</returns>
public static string Serialize<T>(T obj)
using (MemoryStream ms = new MemoryStream())
DataContractJsonSerializer jsonSerializer =
ms.Position = 0;
StreamReader reader = new StreamReader(ms);
result = reader.ReadToEnd();
catch (Exception e)
throw new SerializationException(obj.GetType().Name, e);
public abstract class GroupParameterizedSerializer2
public void SerializeGroup(StreamingContext context)
public class SetMembershipProof2 : GroupParameterizedSerializer2
/// Serialization of a
[DataMember(Name = "a", EmitDefaultValue = false, Order = 2)]
internal string _a;
/// Serialization of c
[DataMember(Name = "c", EmitDefaultValue = false, Order = 3)]
internal string _c;
/// Serialization of r
[DataMember(Name = "r", EmitDefaultValue = false, Order = 4)]
internal string _r;
/// Serialize a, c, r.
/// <param name="context">The streaming context.</param>
internal void OnSerializing(StreamingContext context)
Console.WriteLine("Debug: This isn't called in Mono...");
List<string> t = new List<string>();
_a = t.ToArray();
_c = t.ToArray();
_r = t.ToArray();
Created attachment 8853 [details]
Customer from this desk case:
Reported they were hitting this issue. (Stated directly, w/ link to this bug report.) And asked for info about it's status. Since it looked like the report didn't have much info, I requested their version info, log files & sample project.
This attachment is the sample project, I was able to build it successfully; but other than that I'm not sure what I'm looking for.
They haven't sent over the logs yet so I'm asking for those again; and will add them when they are received.
---Customer's build info---
=== Xamarin Studio ===
Version 5.5.4 (build 15)
Installation UUID: 748b35df-dbee-4077-a803-dd0e95b67eb7
Mono 3.10.0 ((detached/92c4884)
GTK+ 2.24.23 (Raleigh theme)
Package version: 310000031
=== Xamarin.Android ===
Version: 126.96.36.199 (Trial Edition)
Android SDK: /Users/Chris/Library/Developer/Xamarin/android-sdk-macosx
Supported Android versions:
2.1 (API level 7)
2.2 (API level 8)
2.3 (API level 10)
3.1 (API level 12)
4.0.3 (API level 15)
4.4 (API level 19)
5.0 (API level 21)
Java SDK: /usr
java version "1.6.0_65"
Java(TM) SE Runtime Environment (build 1.6.0_65-b14-466.1-11M4716)
Java HotSpot(TM) 64-Bit Server VM (build 20.65-b04-466.1, mixed mode)
=== Apple Developer Tools ===
Xcode 6.1 (6604)
=== Xamarin.Mac ===
=== Xamarin.iOS ===
Version: 188.8.131.52 (Business Edition)
Build date: 2014-11-16 21:03:22-0500
=== Build Information ===
Release ID: 505040015
Git revision: f93940a35458a18052f1a25e106e62ca970d9c40
Build date: 2014-11-19 15:32:41-05
Xamarin addins: dc23cbd91a3a0e1d326328e1229e86c942a49ec8
=== Operating System ===
Mac OS X 10.10.1
Darwin Chriss-MacBook-Pro.local 14.0.0 Darwin Kernel Version 14.0.0
Fri Sep 19 00:26:44 PDT 2014
To be clear the issue I'm having is that .NET will call the [OnSerializing] method, while mono does not.
This means the resulting output for _a, _c, and _r is null
DataContractJsonSerializer jsonSerializer =
In my mind this is a defect, since .NET can serialize the type properly, and the values shouldn't be null.
I will add the logs shortly as an attachment.
Already fixed in recent Mono versions