What is Azure Function?
Azure Functions is a serverless computing service provided by Microsoft Azure that allows us to run our code without worrying about the infrastructure.
Let's Break this term into two, Azure and Function, as Azure is a well-known cloud provider from Microsoft and Function in the sense we can write small pieces of code called "functions", which can be executed on a wide variety of triggers.
These functions can be written in several programming languages, including C#, Java, JavaScript, Python, and PowerShell, and can be deployed, triggered, and scaled quickly and easily in the cloud.
What are triggers, and how are they related to functions?
Triggers are events that cause functions to execute. When a specific event occurs, a function is executed accordingly. Azure provides a variety of triggers that can be used to initiate work.
Here are some of the triggers that can be helpful to us in further going.
- HTTP Trigger- executes a function when an HTTP request is made to a specified URL.
- Timer Trigger- executes a function on a predefined schedule.
- Blob Trigger- executes a function when a new or updated blob is detected in Azure Blob Storage.
- Cosmos DB Trigger- executes a function when a new or updated document is added to an Azure Cosmos DB collection
In our tutorial, we will use HTTP Trigger for our Function to Execute.
So that was a brief about the Azure Function App. Let's now get Started with Creating an Azure Function.
Create an Azure Function Using .Net 6 in Visual Studio 2022
Open your Visual Studio 2022 and Create a New Project for Azure Function.
After selecting the Azure Functions Template, click "Next" and proceed to fill in the required details, including the project name, solution name, and directory where the project will be stored.
Now, Click the "Create" button.
Next, select the type of application you want to create.
Azure Functions utilize triggers, which are events that initiate a function. Each function is associated with only one trigger.
Review the available triggers in the following screen, which illustrates the various triggers available in Visual Studio for an Azure Functions application. Here we are using HTTP Trigger, so we will use that and now click on create.
Once the project is created, we will land on the First File Function1.cs, and there is code written for the HTTP Trigger Function.
We will modify that code and get it to work according to us.
using System;
using System.IO;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.Http;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
namespace Calculator {
public static class Function1 {
[FunctionName("Calculator")]
public static async Task < IActionResult > Run(
[HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req, ILogger log) {
log.LogInformation("C# HTTP trigger function processed a request.");
int num1 = Convert.ToInt32(req.Query["num1"]);
int num2 = Convert.ToInt32(req.Query["num2"]);
int result = num1 + num2;
string responseMessage = $ "Hello, This HTTP triggered function executed successfully. Sum of {num1} and {num2} is {result}";
return new OkObjectResult(responseMessage);
}
}
}
Now, Save the File, and then let's build and execute it.
Once the function is ready to use, it will show this message, and from there, we can get the Localhost URL to execute it in our local environment.
To Execute the Function. Copy this Link http://localhost:7272/api/Calculator. And execute this in Browser.
In the Browser, we will pass the URL with two Numbers in the Query String, and then it will generate desired output as shown below.
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