Create Azure Function App projects

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Develop Azure function app

Prerequisite

Azure Function App project with TypeScript template

Create a new Azure Function App project with TypeScript template

Use func --version to check the version of Azure Functions Core Tools on your computer.
Create a new TypeScript project with func command.
```
$ func init codesanook-azure-function-app --typescript
```
You can change a project name to what is appropriate for you.

CD to the project folder.

$ cd codesanook-azure-function-app

Add a new HTTP function to the project.

$ func new --name http-example --template "HTTP trigger" --authlevel "anonymous"

You can change a function name to what is appropriate for you.

Run the project locally

We can test http-example function locally by CD back to the root of the project and run some Node package manage commands.
In this example, we are going to use Yarn but you can use NPM as well.

To use Yarn, we need to update scrips section in package.json as the following code.

"scripts" : {
  "build": "tsc",
  "build:production": "yarn run prestart",
  "watch": "tsc --w",
  "prestart": "yarn run build && func extensions install",
  "start:host": "func start",
  "start": "npm-run-all --parallel start:host watch"
}

Run the following commands to launch the project:

$ yarn install
$ yarn start

You should now see some output messages in a terminal showing the application is running at a URL and a port number.
Copy the URL of http-example function, e.g. http://localhost:7071/api/http-example to a browser address bar and append query string ?name=<YOUR_NAME>.
Press enter to navigate to that URL and execute the function.
You should see a message as Hello <YOUR_NAME> in a browser.

Azure Function App with C# template

Create a C# Azure Function App with timer trigger

Create a new C# Azure Function App project with func command.

$ func init TimerFunctionApp --dotnet

You can change a project name to what is appropriate for you.

CD to the project folder.

$ cd TimerFunctionApp

Add a new Timer Trigger function to the project.

$ func new --name TimerExample --template "Timer trigger"

To list all available templates for C#, use func templates list -l c#.
You can change a function name to what is appropriate for you.

Open TimerExample.cs file and edit Cron expression to run the function every 5 seconds.

using System;
using Microsoft.Azure.WebJobs;
using Microsoft.Extensions.Logging;
namespace TimerFunctionApp
{
    public class TimerExample
    {
        [FunctionName("TimerExample")]
        public void Run([TimerTrigger("*/5 * * * * *")]TimerInfo myTimer, ILogger log)
        {
            log.LogInformation($"C# Timer trigger function executed at: {DateTime.Now}");
        }
    }
}

Start Azurite emulator

Timer Trigger function requires Blob emulator.

Start Azurite which is an open-source emulator for testing your Azure Blob, Queue Storage, and Table Storage with the following command:

$ docker run \
  -p 10000:10000 \
  -p 10001:10001 \
  -p 10002:10002 \
  -v azurite-data \
  mcr.microsoft.com/azure-storage/azurite

Run the function

Run your function from the root of the project with the following command:
```
$ func start
```
You should now see some output messages as C# Timer trigger function executed at: ... in your terminal every 5 seconds

Azure Function App with C# Isolated process with Docker Linux

Create a C# Azure Function App with timer trigger

Create a new C# Azure Function App project with func command.

$ func init CodesanookAzureFunctionApp --worker-runtime dotnet-isolated --docker

You can change a project name to what is appropriate for you.

CD to the project folder.

$ cd TimerFunctionApp

Add a new HTTP Trigger function to the project.

$ func new --name HttpExample --template "HTTP trigger" --authlevel anonymous

To list all available templates for C#, use func templates list -l c#.
You can change a function name to what is appropriate for you.
You should now see some output messages in a terminal showing the application is running at a URL and a port number.
Copy the URL of http-example function, e.g. http://localhost:7071/api/HttpExample to a browser address bar.
Press enter to navigate to that URL and execute the function.
You should see a message as Welcome to Azure Functions in a browser.
To publish your custom Docker image, please continue with this document.

Credit & Reference

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