Common types of triggers

Let's understand first how a trigger works and get acquainted with the different types of triggers available in Azure Functions.

The architecture of a trigger and how it works is shown in the following figure:

The preceding diagram shows the event that fires the trigger and once the trigger is fired, it runs the Azure Function associated with it.

We need to note a very important point here: one function must have exactly one trigger; in other words, one function can't have multiple triggers.

Now let's see the different types of trigger available in Azure:

• TimerTrigger: This trigger is called on a predefined schedule. We can set the time for execution of the Azure Function using this trigger.
• BlobTrigger: This trigger will get fired when a new or updated blob is detected. The blob contents are provided as input to the function.
• EventHubTrigger: This trigger is used for the application instrumentation, the user experience, workflow processing, and in the Internet of Things...