wikibase.net is an api for the MediaWiki Wikibase extension based on .NET Framework 2.0. For more information about Wikibase see https://www.mediawiki.org/wiki/Wikibase. Wikibase is the software Wikidata depends on.
This api is still in development and does not promise to be stable. Thus if you find a bug, please report it or even better, create a patch and make a pull request. Contributions are very welcome.
The api has a more or less complex structure, so here is a short overview. Detailed information and documentation can be found in the wiki.
The base class that is needed everywhere is the WikibaseApi. It provides internal access to the api and handles user data. With the EntityProvider you can get an instance of the Entity class, which is either an Item or a Property. Besides labels, descriptions and aliases for each language, Entities also consist of claims. A Claim has a main Snak that provides a DataValue. If the claim is a Statement (it always is a statement atm.), it can be proved by a Reference which itself contains several snaks. A claim actually also has some qualifiers but they are not supported yet.
You can clone the source code from this repository to your local machine and compile it there. Note that the project depends on minimaljson.net, a JSON parser to get the api responses. You can download it here.
However, there is also a zipped compiled version of the api which is ready to use yet. Just download the file and unzip it. Then copy the DLLs into your project folder and add Wikibase.dll as a refer to your project. Finally you have to add the using directive at the top of your file: using Wikibase;.
wikibase.net is licensed under the GNU GENERAL PUBLIC LICENSE Version 2 (GPL v2). A copy of the license can be found in the LICENSE file.