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agraph-csharp-client: A C# client for AllegroGraph

Table of contents

  • Description
  • Author
  • Documentation
  • Platforms
  • Dependencies
  • Installation
  • Configuration
  • Licence
  • Notes
  • Examples
  • Franz Inc. Open Source Info


This library is an C# version of the core java library for programmatically interacting with the AllegroGraph, from Franz, Inc. This is the initial version of the library, and additional features will be added over time.


Steve Paplanus,

Author Comments

The purpose of this library was to fill a major requirement for projects that I work on, which is that they need to be .NET compatible. I have decided to implement it so that it is both a straight library and also compatible with WCF. This enables the client to work on both Mono and Visual Studio, and is setup to be utilized in a more SOA type of environment via WCF. Whether it ever will get to the latter SOA use, who knows. However, it was very easy to implement.

The client is free to use in your projects. My request is that if you find bugs or wish to ask for enhancements, that you either email me with the information or the fix. The client, in its current form, has the ability to create and get information about catalogs, return repository information, and to perform sparql and prolog queries. Future versions will complete the stub functions for the create, update, and deletion of actual statements inside the repository.


Windows 2000/XP/Vista/Server2003 32/64bit or Linux 32/64 bit


MS .NET framework or mono.


TODO - Add documentation on how to install this project


TODO - Add documentation on how to configure this project once installed


TODO - Add content or links to documentation on how to use this project.


The agraph-csharp-client source code is licensed under the terms of the Lisp Lesser GNU Public License, known as the LLGPL. The LLGPL consists of a preamble and the LGPL. Where these conflict, the preamble takes precedence. This project is referenced in the preamble as the LIBRARY.


There are four main classes that make up the library. I have included a basic JSON utility class that takes the results from a query, which is usually a json array, and translates it to a ADO.NET datatable. You can use other json libraries, but this was made to fix a quick need for several projects we are ramping up internally.

The typical class you will interact with is the Repository class, which handles displaying the statements in your ontology as well as exposes the query functionality. You will typically initialize a repository object like this:

AllegroGraphCSharpClient.Repository rep = new AllegroGraphCSharpClient.Repository(@"http://webserv:8000/catalogs/Test/repositories/Tools");

where the Repository object expects you to initialize with the url of the allegrograph repository in the format of:

http://<web server name>:<http port for allegrograph>/catalogs/<repository Name>/repositories/<ontology>

You can then create a results object, which is what every function returns either a single AllegroGraphCSharpClientResults object or a List<AllegroGraphCSharpClient.Results>. For example, to create a List of Results the following syntax:

List<AllegroGraphCSharpClient.Results> results = new List<AllegroGraphCSharpClient.Results>(); 

This results object has a single property, a string called "result". I have added to both evalSparqlQuery and evalPrologQuery a parameter called AdditionalPrefixes, which allows you to define additional references that your ontology references. An example string would look like:

PREFIX fn:<>  PREFIX bio:<>

which defines two namespaces fn and bio.

To find additional information about the function calls, you can look at [Franz's documentation] (

Another class is the catalog class, which is a basic class that will return information about a catalog, list the statements within a catalog, create a catalog, and delete a catalog.

The final class, a low level class, called Request, handles all the REST interaction between the server and the client, including the relevant GET/PUT/POST/DELETE statements.

Examples and Information

See the notes section above.

Franz Open Source Info

This project's homepage is There is an informal community support and development mailing list for these open source projects. We encourage you to take advantage by subscribing to the list. Once you're subscribed, email to with your questions, comments, suggestions, and patches.


A C# client for AllegroGraph



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