JsonExSerializer-discuss Google Group

Re: No parameterless constructor defined for this object

elliott....@gmail.com (Ted Elliott) — Sat, 10 Jul 2010 00:58:49 UT

It depends on what the object you are serializing and the third party
object looks like. Maybe you could post an example?
If there is a property on the object that maps to the constructor
arguments then you can flag the property as a constructor parameter
like this:

public class Customer {
private int _id;

No parameterless constructor defined for this object

johnwebbc...@gmail.com (John Cole) — Fri, 09 Jul 2010 14:01:15 UT

I have a third party class I'm trying to serialize with the latest
JsonExSerializer. But on one property, I'm getting the following
error trying to deserialize the object:

System.MissingMethodException : No parameterless constructor defined
for this object.

What is the way to get around this? Is there an example of providing

Re: Problem (and resolution) when using the C5 generic collection library

elliott....@gmail.com (Ted Elliott) — Fri, 12 Feb 2010 07:06:52 UT

Thank you for finding and submitting a fix for this and a very
detailed explanation of the problem. I will definitely add this in.
I also noticed I was using a very weak name for the type which might
have stopped all this in the first place. I am going to switch from
typeof(ICollection<>).Name to typeof(ICollection<>).FullName . With

Problem (and resolution) when using the C5 generic collection library

b...@ntlworld.com (Bob) — Wed, 10 Feb 2010 16:00:31 UT

Hi Ted,
Thanks for a brilliant class. Since you have taken the time to put
this together and test it I thought it only fair to share a suggested
modification with you and others. First let me add some context.
The C5 Generic Collection Library is produced and published by the IT
University of Copenhagen who describe it thus:

Re: Need to override how some elements are serialized/deserialized

elliott....@gmail.com (Ted Elliott) — Thu, 01 Oct 2009 05:23:19 UT

Ok, I've implemented a property naming strategy. There are a few out
of the box strategies (PascalCase, CamelCase, Underscore) as well as
the ability to create your own. I also added the ability to modify a
property's "Alias" directly. The Alias is a new concept introduced
with this change and is what is used in the output. It defaults to

Re: Need to override how some elements are serialized/deserialized

j...@jdiligence.com (John) — Wed, 16 Sep 2009 15:03:06 UT

Basically, its the strategy pattern.

JSON is used a lot to interchange between systems in different
languages.
XML is too bloat if the messages are big. In our system they can be
huge.
This is also a good argument for making JSON parsers work on streams
rather
than loading strings into memory and building intermediary objects.

Re: [JsonExSerializer-discuss] Re: Need to override how some elements are serialized/deserialized

elliott....@gmail.com (Ted Elliott) — Wed, 16 Sep 2009 13:28:48 UT

Yes and No. It's possible by overriding a couple of classes (TypeData,
PropertyData), but nothing that's really pluggable. It's a good idea
though. Could you give some examples of what you have in mind? I should
probably add an option to match case-insensitive too when looking up a
property.

Re: Need to override how some elements are serialized/deserialized

j...@jdiligence.com (John) — Wed, 16 Sep 2009 11:11:59 UT

Thanks a lot. I got the desrialization working in the end. Will work
on the other side of the coin today.

In doing this I noticed it would be really useful to decouple the
property resolution as between different languages there are different
naming conventions for properties.

I ended up renaming all my c sharp properties in ways that are not c

Re: [JsonExSerializer-discuss] Re: Need to override how some elements are serialized/deserialized

elliott....@gmail.com (Ted Elliott) — Tue, 15 Sep 2009 13:38:28 UT

No that shouldn't be a problem. The expression tree is built completely in
memory before it converts it to an object.

Re: Need to override how some elements are serialized/deserialized

j...@jdiligence.com (John) — Tue, 15 Sep 2009 13:36:33 UT

Thank you for your informative responses I will try them out and see
what happens.

The only concern I have is that when deserializing I cannot guarantee
the order of the fields, so the data fields may appear before the
column definitions that they rely on in the stream.

Would this be a show stopper before I get stuck in later today?

Re: Need to override how some elements are serialized/deserialized

elliott....@gmail.com (Ted Elliott) — Sun, 13 Sep 2009 05:16:43 UT

Also note, I've been doing a little refactoring in the trunk so the
types are slightly different than what's in the release version:
New to Old
IConfiguration --> SerializationContext
IExpressionBuilder -> ISerializerHandler

Re: Need to override how some elements are serialized/deserialized

elliott....@gmail.com (Ted Elliott) — Sun, 13 Sep 2009 05:12:44 UT

I've been thinking about writing an expression handler for DataTable
and DataSet for a while now, so I decided to go ahead and code one
since it is very similar to your issue. The expression handler is
here:
[link]

Re: Need to override how some elements are serialized/deserialized

elliott....@gmail.com (Ted Elliott) — Sun, 13 Sep 2009 03:33:54 UT

Here's an example of an Expression handler to get you started. It
sounds like maybe you just need to tell the serializer what the data
types are during deserialization so I've left GetExpression (called
during serialization) not doing much. Evaluate is called during
deserialization and I've put in some code there to get you started.

Need to override how some elements are serialized/deserialized

j...@jdiligence.com (John) — Thu, 10 Sep 2009 15:11:26 UT

I need to override some elements and change the way they are
serialized depending on other fields within the object. Below the type
of object in the list of lists (data) depends on the column object
within the same object. How can I do this?

I could use just the low level expression stuff which I can then

Re: IParsingStage issue

leonard.nico...@gmail.com (Nicolas) — Tue, 18 Aug 2009 08:46:46 UT

Ok, great, I wondered why my custom type was overwritten ....

Thank you very much for your great work and for your quick answer.