FluentxApi

A fluent .Net Standard library to create xApi statements and communicate with a LRS

Installation

Add the NuGet package to your project using the Package Manager Console.

PM> Install-Package Mos.xApi

Getting started

Creating a statement

Use the Statement.Create static method to start the Statement building. All the complex objects then have a fluent builder that simplifies the creation of the Statement object.

var newStatement =
    Statement.Create(
        Actor.CreateAgent("Example Learner").WithMailBox("example.learner@adlnet.gov"),
        Verb.Create("http://adlnet.gov/expapi/verbs/attempted").AddDisplay("en-US", "attempted"),
        StatementObject.CreateActivity("http://example.adlnet.gov/xapi/example/simpleCBT")
                        .AddName("en-US", "simple CBT course")
                        .AddDescription("en-US", "A fictious example CBT course"))
        .WithResult(Result.Create()
                            .WithScore(new Score(0.95))
                            .WithSuccess(true)
                            .WithCompletion(true)
                            .WithDuration(TimeSpan.FromSeconds(1234)))
        .Build();

Once the Statement has been created, it can be serialized to json using the ToJson method. This method takes a boolean argument setting if it should be pretty printed or not.

var json = statement.ToJson(true);
Console.WriteLine(json);

Communication with a LRS

An LRS Client is also implemented in the Mos.xApi.LrsClient namespace. It implements an interface called ILrsClient and uses asynchronous methods.

using Mos.xApi.LrsClient;
...

ILrsClient lrsClient = new LrsClient("http://www.example.com/mylrs");

Statement statement = await lrsClient.GetStatementAsync(new Guid("d0371e17-4e91-46ba-924f-e78168bf0f02"));

var statementResult = await lrsClient.FindStatement(new StatementQuery{ActivityId = new Uri("http://adlnet.gov/expapi/verbs/completed")});

var statements = statementResult.Statements;

if(statements.More != null){
    var moreStatementResult = await lrsClient.FindMoreStatements(statements.More);
}

await lrsClient.SendStatementAsync(newStatement);

Parsing Statements from json

A static method Statement.FromJson allows to deserialize a statement defined as a Json string.

string jsonStatement = "...";

var statement = Statement.FromJson(jsonStatement);

Contributing

Please send your pull requests to the master branch (ideally from a feature branch in your own fork).

You can add bugs or feature requests by creating a new item on the issues page.

Credits

This project uses the following open source components

• Newtonsoft.Json