public void ClientDemo()
{
var client = new DigitalTwinsClient();
DigitalTwin twin = client.GetTwin(); // creates DigitalTwin instance and stores the JSON payload in it, i.e. very cheap
string json = twin.ToString(); // gets the origin JSON payload.
Assert.IsTrue(ReferenceEquals(s_demo_payload, json)); // the payload is really the same string as was passed into DigitalTwin ctor
Assert.AreEqual("ID0001", twin.Id); // this is where the JSON string is parsed (lazily)
Assert.AreEqual(123, twin.CreatedAt);
Assert.AreEqual(true, twin.Decomissioned);
// Temperature and Unit are not on DigitaTwin (they are user defined properties), so let's use dynamic APIs.
dynamic dynamic = twin;
Assert.AreEqual(72, dynamic.Temperature);
Assert.AreEqual("F", dynamic.Unit);
Assert.AreEqual(123, dynamic.CreatedAt); // the service defined properties are also avaliable through dynamic calls.
// the client also has strongly typed APIs
TemperatureSensor sensor = client.GetTwin <TemperatureSensor>();
Assert.AreEqual("F", sensor.Unit);
Assert.AreEqual(72, sensor.Temperature);
Assert.AreEqual("ID0001", sensor.Id);
Assert.AreEqual(123, sensor.CreatedAt);
Assert.AreEqual(true, sensor.Decomissioned);
// Interestingly, the base twin type can be converted to user defined type
sensor = twin.As <TemperatureSensor>();
Assert.AreEqual("F", sensor.Unit);
Assert.AreEqual(72, sensor.Temperature);
Assert.AreEqual("ID0001", sensor.Id);
Assert.AreEqual(123, sensor.CreatedAt);
Assert.AreEqual(true, sensor.Decomissioned);
}
private DigitalTwinClient(Uri uri, IotServiceClientCredentials credentials, params DelegatingHandler[] handlers)
{
var httpMessageHandler = HttpClientHelper.CreateDefaultHttpMessageHandler(null, uri, ServicePointHelpers.DefaultConnectionLeaseTimeout);
#pragma warning disable CA2000 // Dispose objects before losing scope (httpMessageHandlerWithDelegatingHandlers is disposed when the http client owning it is disposed)
HttpMessageHandler httpMessageHandlerWithDelegatingHandlers = CreateHttpHandlerPipeline(httpMessageHandler, handlers);
#pragma warning restore CA2000 // Dispose objects before losing scope
#pragma warning disable CA2000 // Dispose objects before losing scope (httpClient is disposed when the protocol layer client owning it is disposed)
var httpClient = new HttpClient(httpMessageHandlerWithDelegatingHandlers, true)
{
BaseAddress = uri
};
#pragma warning restore CA2000 // Dispose objects before losing scope
#pragma warning restore CA2000 // Dispose objects before losing scope
// When this client is disposed, all the http message handlers and delegating handlers will be disposed automatically
_client = new IotHubGatewayServiceAPIs(credentials, httpClient, true);
_client.BaseUri = uri;
_protocolLayer = new DigitalTwin(_client);
}
public TemperatureSensor(DigitalTwin twin) : base(twin.ToString())
{
}
private DigitalTwinClient(Uri uri, IotServiceClientCredentials credentials, params DelegatingHandler[] handlers)
{
_client = new IotHubGatewayServiceAPIs(uri, credentials, handlers);
_protocolLayer = new DigitalTwin(_client);
}