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Is there a way to generate c# code from serialized object in bson (file on a disk) to

What I have is a serialized object (given to me serialized from another language). I would like to generate c# code for this and use it in JSON.Net or similar. I have just started looking at JSON.Net capabilities. However, thought it may be interesting to ask it here in parallel.

I have found 2 great options:
json2csharp works well, which is a lightweight website giving .NET code that can be copy-pasted.
JsonCSharpClassGenerator is an executable that creates actual files in a subfolder of your choosing. So it's better for bulk .NET class generation from a large JSON string.

Based on the list here, there are several BSON implementations for C#:
http://bsonspec.org/#/implementation
One example is JSON.

LINQ to JSON in .NET

Is there such a thing as a JSON file? That is, *.json?
Can JSON be used in C# code without any JavaScript stuff, sort of as a replacement for XML?
And is there any official LINQ to JSON stuff around for C#?
I did find one website for my last question, but it took me to a page to download JSON.NET, and that page doesn't seem to mention anything about LINQ.

Yes, there is such a thing as a *.json file. The MIME type is application/json (source). JSON is a text-based format though, so you could hypothetically store JSON-formatted data in a text file with whatever extension you choose.
JSON can absolutely be used independently of JavaScript. In some cases, it's probably better suited to representing your data than XML. JSON.org has a great comparison page between JSON and XML.
JSON.org lists several JSON libraries for C# (for example, JSON.NET which you have already discovered), and most (if not all) of the collections that these libraries use should support LINQ. JSON.NET definitely does offer support for it. See here or here.

Everyone tends to stick with the JavaScriptSerializer (from the System.Web.Extensions library) when working with JSON in .NET. The handy part about this is the ability to create a custom JavaScriptConverter that will take custom objects and serialize them the way you chose. Likewise, you can make a deserialization method to receive in custom JSON formatting.
Though this of course depends on your application. Given that it's a Windows Forms application, is there any particular reason you'd chose JSON over storing the information natively or just use the XML format? If your application communicates with webpages, the JavaScriptSerializer is probably the best bet, though if you're using it to store/retrieve settings I'd use XML. And, if it's necessary to synchronize your application with a web-based one, just serialize to JSON when the time is ready.

You can deserialize your JSON file into C# objects. After that, you can query with LINQ on these objects.

Serialization java to c#

I have manged to serialize an arraylist in java using xstream, send it to my c# application via http and then write that to file (just for now).
The serialized data was an arraylist in java. I want to try and re form this arraylist in c# from the xml i have.
I have been looking at http://code.google.com/p/xstream-dot-net/ to do this. Does anyone know if that is the right way to go or is there a better way of reforming the serialized data in c#?

I have used JSON.NET (Newtonsoft) on the .NET side and Google's GSON on the java side and it seems to work for Dictionaries, Maps, Sets, Lists, Date, and primitive types with very little configuration involved. Refer to https://github.com/chandru9279/Spikes for it.

The easiest way to convert a PHP script into OpCode using C#?

What is the easiest way to convert a PHP script (.php) into OpCode/Bytecode (Operation Code) using C#? I can use DLLs if I have to.
I need this to be done for the project I am working in order to analyze PHP code easier.
Any thoughts or ideas are welcome.

Phalanger is what you're looking for.

I do not think you can do a literal conversion since it is interpreted on the fly. You would essentially have to dissect the PHP engine.
Each PHP engine will be different and in another example of using Phalanger, that is simply being converted to CLR -- ie: it's no longer PHP so you would really be analyzing .NET CLR.

Need to construct a XML representation for C# code

I need to convert C# code to an equivalent XML representation.
I plan to convert the C# code (C# 2.0 code snippets, no generics or nullable types) to an AST and then convert the AST to XML.
Looking for a simple lexer/parser for C# which outputs an AST.
Any pointers on converting C# code to an XML representation (which can be converted back to C#) would also be very helpful.
Kind regards,

MinosseCC: a lexer/parser generator for C#
Also SO questions:
Parser-generator that outputs C# given a BNF grammar? which suggests using ANTLR
Translate C# code into AST?
C# String to Expression Tree
Developing a simple parser

As Mitch says, Antlr can be your solution. You can transform Antlr's AST output depending on your needs and then serialize it with xstream. That's the approach I'm using in my bs project, If anyone knows a better way It'll be great for me aswell.
You can find csharp grammar samples like for example http://www.antlr.org/grammar/1127720913326/tkCSharp.g or http://www.antlr.org/grammar/1151612545460/CSharpParser.g but you might have to adapt it to ANTLRV3 or to your own needs.

Our DMS Software Reengineering Toolkit is an ecosystem for building code analyzers and transformers. DMS is parameterized by a language definition, and has language definitions for C#, Java, C++, C, PL/SQL, PHP, JavaScript, COBOL and a variety of other langauges. When DMS parses according to a langauge definition, it automatically builds an AST. An AST library provided by DMS can print the tree in Lisp-like parenthesized form, or in XML format.
Rather than convert XML back into source code, DMS can regenerated the source code directly from the AST. DMS also provides source-to-source transformations to allow manipulation of the AST.